diff options
Diffstat (limited to 'usbdrv')
| -rw-r--r-- | usbdrv/Changelog.txt | 329 | ||||
| -rw-r--r-- | usbdrv/CommercialLicense.txt | 166 | ||||
| -rw-r--r-- | usbdrv/License.txt | 361 | ||||
| -rw-r--r-- | usbdrv/Readme.txt | 172 | ||||
| -rw-r--r-- | usbdrv/USB-ID-FAQ.txt | 149 | ||||
| -rw-r--r-- | usbdrv/USB-IDs-for-free.txt | 154 | ||||
| -rw-r--r-- | usbdrv/asmcommon.inc | 187 | ||||
| -rw-r--r-- | usbdrv/oddebug.c | 49 | ||||
| -rw-r--r-- | usbdrv/oddebug.h | 122 | ||||
| -rw-r--r-- | usbdrv/usbconfig-prototype.h | 384 | ||||
| -rw-r--r-- | usbdrv/usbdrv.c | 628 | ||||
| -rw-r--r-- | usbdrv/usbdrv.h | 746 | ||||
| -rw-r--r-- | usbdrv/usbdrvasm.S | 392 | ||||
| -rw-r--r-- | usbdrv/usbdrvasm.asm | 20 | ||||
| -rw-r--r-- | usbdrv/usbdrvasm12.inc | 392 | ||||
| -rw-r--r-- | usbdrv/usbdrvasm128.inc | 749 | ||||
| -rw-r--r-- | usbdrv/usbdrvasm15.inc | 422 | ||||
| -rw-r--r-- | usbdrv/usbdrvasm16.inc | 345 | ||||
| -rw-r--r-- | usbdrv/usbdrvasm165.inc | 452 | ||||
| -rw-r--r-- | usbdrv/usbdrvasm18-crc.inc | 706 | ||||
| -rw-r--r-- | usbdrv/usbdrvasm20.inc | 359 | ||||
| -rw-r--r-- | usbdrv/usbportability.h | 143 |
22 files changed, 7427 insertions, 0 deletions
diff --git a/usbdrv/Changelog.txt b/usbdrv/Changelog.txt new file mode 100644 index 0000000..79b5215 --- /dev/null +++ b/usbdrv/Changelog.txt @@ -0,0 +1,329 @@ +This file documents changes in the firmware-only USB driver for atmel's AVR +microcontrollers. New entries are always appended to the end of the file. +Scroll down to the bottom to see the most recent changes. + +2005-04-01: + - Implemented endpoint 1 as interrupt-in endpoint. + - Moved all configuration options to usbconfig.h which is not part of the + driver. + - Changed interface for usbVendorSetup(). + - Fixed compatibility with ATMega8 device. + - Various minor optimizations. + +2005-04-11: + - Changed interface to application: Use usbFunctionSetup(), usbFunctionRead() + and usbFunctionWrite() now. Added configuration options to choose which + of these functions to compile in. + - Assembler module delivers receive data non-inverted now. + - Made register and bit names compatible with more AVR devices. + +2005-05-03: + - Allow address of usbRxBuf on any memory page as long as the buffer does + not cross 256 byte page boundaries. + - Better device compatibility: works with Mega88 now. + - Code optimization in debugging module. + - Documentation updates. + +2006-01-02: + - Added (free) default Vendor- and Product-IDs bought from voti.nl. + - Added USBID-License.txt file which defines the rules for using the free + shared VID/PID pair. + - Added Readme.txt to the usbdrv directory which clarifies administrative + issues. + +2006-01-25: + - Added "configured state" to become more standards compliant. + - Added "HALT" state for interrupt endpoint. + - Driver passes the "USB Command Verifier" test from usb.org now. + - Made "serial number" a configuration option. + - Minor optimizations, we now recommend compiler option "-Os" for best + results. + - Added a version number to usbdrv.h + +2006-02-03: + - New configuration variable USB_BUFFER_SECTION for the memory section where + the USB rx buffer will go. This defaults to ".bss" if not defined. Since + this buffer MUST NOT cross 256 byte pages (not even touch a page at the + end), the user may want to pass a linker option similar to + "-Wl,--section-start=.mybuffer=0x800060". + - Provide structure for usbRequest_t. + - New defines for USB constants. + - Prepared for HID implementations. + - Increased data size limit for interrupt transfers to 8 bytes. + - New macro usbInterruptIsReady() to query interrupt buffer state. + +2006-02-18: + - Ensure that the data token which is sent as an ack to an OUT transfer is + always zero sized. This fixes a bug where the host reports an error after + sending an out transfer to the device, although all data arrived at the + device. + - Updated docs in usbdrv.h to reflect changed API in usbFunctionWrite(). + +* Release 2006-02-20 + + - Give a compiler warning when compiling with debugging turned on. + - Added Oleg Semyonov's changes for IAR-cc compatibility. + - Added new (optional) functions usbDeviceConnect() and usbDeviceDisconnect() + (also thanks to Oleg!). + - Rearranged tests in usbPoll() to save a couple of instructions in the most + likely case that no actions are pending. + - We need a delay between the SET ADDRESS request until the new address + becomes active. This delay was handled in usbPoll() until now. Since the + spec says that the delay must not exceed 2ms, previous versions required + aggressive polling during the enumeration phase. We have now moved the + handling of the delay into the interrupt routine. + - We must not reply with NAK to a SETUP transaction. We can only achieve this + by making sure that the rx buffer is empty when SETUP tokens are expected. + We therefore don't pass zero sized data packets from the status phase of + a transfer to usbPoll(). This change MAY cause troubles if you rely on + receiving a less than 8 bytes long packet in usbFunctionWrite() to + identify the end of a transfer. usbFunctionWrite() will NEVER be called + with a zero length. + +* Release 2006-03-14 + + - Improved IAR C support: tiny memory model, more devices + - Added template usbconfig.h file under the name usbconfig-prototype.h + +* Release 2006-03-26 + + - Added provision for one more interrupt-in endpoint (endpoint 3). + - Added provision for one interrupt-out endpoint (endpoint 1). + - Added flowcontrol macros for USB. + - Added provision for custom configuration descriptor. + - Allow ANY two port bits for D+ and D-. + - Merged (optional) receive endpoint number into global usbRxToken variable. + - Use USB_CFG_IOPORTNAME instead of USB_CFG_IOPORT. We now construct the + variable name from the single port letter instead of computing the address + of related ports from the output-port address. + +* Release 2006-06-26 + + - Updated documentation in usbdrv.h and usbconfig-prototype.h to reflect the + new features. + - Removed "#warning" directives because IAR does not understand them. Use + unused static variables instead to generate a warning. + - Do not include <avr/io.h> when compiling with IAR. + - Introduced USB_CFG_DESCR_PROPS_* in usbconfig.h to configure how each + USB descriptor should be handled. It is now possible to provide descriptor + data in Flash, RAM or dynamically at runtime. + - STALL is now a status in usbTxLen* instead of a message. We can now conform + to the spec and leave the stall status pending until it is cleared. + - Made usbTxPacketCnt1 and usbTxPacketCnt3 public. This allows the + application code to reset data toggling on interrupt pipes. + +* Release 2006-07-18 + + - Added an #if !defined __ASSEMBLER__ to the warning in usbdrv.h. This fixes + an assembler error. + - usbDeviceDisconnect() takes pull-up resistor to high impedance now. + +* Release 2007-02-01 + + - Merged in some code size improvements from usbtiny (thanks to Dick + Streefland for these optimizations!) + - Special alignment requirement for usbRxBuf not required any more. Thanks + again to Dick Streefland for this hint! + - Reverted to "#warning" instead of unused static variables -- new versions + of IAR CC should handle this directive. + - Changed Open Source license to GNU GPL v2 in order to make linking against + other free libraries easier. We no longer require publication of the + circuit diagrams, but we STRONGLY encourage it. If you improve the driver + itself, PLEASE grant us a royalty free license to your changes for our + commercial license. + +* Release 2007-03-29 + + - New configuration option "USB_PUBLIC" in usbconfig.h. + - Set USB version number to 1.10 instead of 1.01. + - Code used USB_CFG_DESCR_PROPS_STRING_DEVICE and + USB_CFG_DESCR_PROPS_STRING_PRODUCT inconsistently. Changed all occurrences + to USB_CFG_DESCR_PROPS_STRING_PRODUCT. + - New assembler module for 16.5 MHz RC oscillator clock with PLL in receiver + code. + - New assembler module for 16 MHz crystal. + - usbdrvasm.S contains common code only, clock-specific parts have been moved + to usbdrvasm12.S, usbdrvasm16.S and usbdrvasm165.S respectively. + +* Release 2007-06-25 + + - 16 MHz module: Do SE0 check in stuffed bits as well. + +* Release 2007-07-07 + + - Define hi8(x) for IAR compiler to limit result to 8 bits. This is necessary + for negative values. + - Added 15 MHz module contributed by V. Bosch. + - Interrupt vector name can now be configured. This is useful if somebody + wants to use a different hardware interrupt than INT0. + +* Release 2007-08-07 + + - Moved handleIn3 routine in usbdrvasm16.S so that relative jump range is + not exceeded. + - More config options: USB_RX_USER_HOOK(), USB_INITIAL_DATATOKEN, + USB_COUNT_SOF + - USB_INTR_PENDING can now be a memory address, not just I/O + +* Release 2007-09-19 + + - Split out common parts of assembler modules into separate include file + - Made endpoint numbers configurable so that given interface definitions + can be matched. See USB_CFG_EP3_NUMBER in usbconfig-prototype.h. + - Store endpoint number for interrupt/bulk-out so that usbFunctionWriteOut() + can handle any number of endpoints. + - Define usbDeviceConnect() and usbDeviceDisconnect() even if no + USB_CFG_PULLUP_IOPORTNAME is defined. Directly set D+ and D- to 0 in this + case. + +* Release 2007-12-01 + + - Optimize usbDeviceConnect() and usbDeviceDisconnect() for less code size + when USB_CFG_PULLUP_IOPORTNAME is not defined. + +* Release 2007-12-13 + + - Renamed all include-only assembler modules from *.S to *.inc so that + people don't add them to their project sources. + - Distribute leap bits in tx loop more evenly for 16 MHz module. + - Use "macro" and "endm" instead of ".macro" and ".endm" for IAR + - Avoid compiler warnings for constant expr range by casting some values in + USB descriptors. + +* Release 2008-01-21 + + - Fixed bug in 15 and 16 MHz module where the new address set with + SET_ADDRESS was already accepted at the next NAK or ACK we send, not at + the next data packet we send. This caused problems when the host polled + too fast. Thanks to Alexander Neumann for his help and patience debugging + this issue! + +* Release 2008-02-05 + + - Fixed bug in 16.5 MHz module where a register was used in the interrupt + handler before it was pushed. This bug was introduced with version + 2007-09-19 when common parts were moved to a separate file. + - Optimized CRC routine (thanks to Reimar Doeffinger). + +* Release 2008-02-16 + + - Removed outdated IAR compatibility stuff (code sections). + - Added hook macros for USB_RESET_HOOK() and USB_SET_ADDRESS_HOOK(). + - Added optional routine usbMeasureFrameLength() for calibration of the + internal RC oscillator. + +* Release 2008-02-28 + + - USB_INITIAL_DATATOKEN defaults to USBPID_DATA1 now, which means that we + start with sending USBPID_DATA0. + - Changed defaults in usbconfig-prototype.h + - Added free USB VID/PID pair for MIDI class devices + - Restructured AVR-USB as separate package, not part of PowerSwitch any more. + +* Release 2008-04-18 + + - Restructured usbdrv.c so that it is easier to read and understand. + - Better code optimization with gcc 4. + - If a second interrupt in endpoint is enabled, also add it to config + descriptor. + - Added config option for long transfers (above 254 bytes), see + USB_CFG_LONG_TRANSFERS in usbconfig.h. + - Added 20 MHz module contributed by Jeroen Benschop. + +* Release 2008-05-13 + + - Fixed bug in libs-host/hiddata.c function usbhidGetReport(): length + was not incremented, pointer to length was incremented instead. + - Added code to command line tool(s) which claims an interface. This code + is disabled by default, but may be necessary on newer Linux kernels. + - Added usbconfig.h option "USB_CFG_CHECK_DATA_TOGGLING". + - New header "usbportability.h" prepares ports to other development + environments. + - Long transfers (above 254 bytes) did not work when usbFunctionRead() was + used to supply the data. Fixed this bug. [Thanks to Alexander Neumann!] + - In hiddata.c (example code for sending/receiving data over HID), use + USB_RECIP_DEVICE instead of USB_RECIP_INTERFACE for control transfers so + that we need not claim the interface. + - in usbPoll() loop 20 times polling for RESET state instead of 10 times. + This accounts for the higher clock rates we now support. + - Added a module for 12.8 MHz RC oscillator with PLL in receiver loop. + - Added hook to SOF code so that oscillator can be tuned to USB frame clock. + - Added timeout to waitForJ loop. Helps preventing unexpected hangs. + - Added example code for oscillator tuning to libs-device (thanks to + Henrik Haftmann for the idea to this routine). + - Implemented option USB_CFG_SUPPRESS_INTR_CODE. + +* Release 2008-10-22 + + - Fixed libs-device/osctune.h: OSCCAL is memory address on ATMega88 and + similar, not offset of 0x20 needs to be added. + - Allow distribution under GPLv3 for those who have to link against other + code distributed under GPLv3. + +* Release 2008-11-26 + + - Removed libusb-win32 dependency for hid-data example in Makefile.windows. + It was never required and confused many people. + - Added extern uchar usbRxToken to usbdrv.h. + - Integrated a module with CRC checks at 18 MHz by Lukas Schrittwieser. + +* Release 2009-03-23 + + - Hid-mouse example used settings from hid-data example, fixed that. + - Renamed project to V-USB due to a trademark issue with Atmel(r). + - Changed CommercialLicense.txt and USBID-License.txt to make the + background of USB ID registration clearer. + +* Release 2009-04-15 + + - Changed CommercialLicense.txt to reflect the new range of PIDs from + Jason Kotzin. + - Removed USBID-License.txt in favor of USB-IDs-for-free.txt and + USB-ID-FAQ.txt + - Fixed a bug in the 12.8 MHz module: End Of Packet decection was made in + the center between bit 0 and 1 of each byte. This is where the data lines + are expected to change and the sampled data may therefore be nonsense. + We therefore check EOP ONLY if bits 0 AND 1 have both been read as 0 on D-. + - Fixed a bitstuffing problem in the 16 MHz module: If bit 6 was stuffed, + the unstuffing code in the receiver routine was 1 cycle too long. If + multiple bytes had the unstuffing in bit 6, the error summed up until the + receiver was out of sync. + - Included option for faster CRC routine. + Thanks to Slawomir Fras (BoskiDialer) for this code! + - Updated bits in Configuration Descriptor's bmAttributes according to + USB 1.1 (in particular bit 7, it is a must-be-set bit now). + +* Release 2009-08-22 + + - Moved first DBG1() after odDebugInit() in all examples. + - Use vector INT0_vect instead of SIG_INTERRUPT0 if defined. This makes + V-USB compatible with the new "p" suffix devices (e.g. ATMega328p). + - USB_CFG_CLOCK_KHZ setting is now required in usbconfig.h (no default any + more). + - New option USB_CFG_DRIVER_FLASH_PAGE allows boot loaders on devices with + more than 64 kB flash. + - Built-in configuration descriptor allows custom definition for second + endpoint now. + +* Release 2010-07-15 + + - Fixed bug in usbDriverSetup() which prevented descriptor sizes above 255 + bytes. + - Avoid a compiler warning for unused parameter in usbHandleResetHook() when + compiler option -Wextra is enabled. + - Fixed wrong hex value for some IDs in USB-IDs-for-free.txt. + - Keep a define for USBATTR_BUSPOWER, although the flag does not exist + in USB 1.1 any more. Set it to 0. This is for backward compatibility. + +* Release 2012-01-09 + + - Define a separate (defined) type for usbMsgPtr so that projects using a + tiny memory model can define it to an 8 bit type in usbconfig.h. This + change also saves a couple of bytes when using a scalar 16 bit type. + - Inserted "const" keyword for all PROGMEM declarations because new GCC + requires it. + - Fixed problem with dependence of usbportability.h on usbconfig.h. This + problem occurred with IAR CC only. + - Prepared repository for github.com. + +* Release 2012-12-06
\ No newline at end of file diff --git a/usbdrv/CommercialLicense.txt b/usbdrv/CommercialLicense.txt new file mode 100644 index 0000000..de1a2b0 --- /dev/null +++ b/usbdrv/CommercialLicense.txt @@ -0,0 +1,166 @@ +V-USB Driver Software License Agreement +Version 2012-07-09 + +THIS LICENSE AGREEMENT GRANTS YOU CERTAIN RIGHTS IN A SOFTWARE. YOU CAN +ENTER INTO THIS AGREEMENT AND ACQUIRE THE RIGHTS OUTLINED BELOW BY PAYING +THE AMOUNT ACCORDING TO SECTION 4 ("PAYMENT") TO OBJECTIVE DEVELOPMENT. + + +1 DEFINITIONS + +1.1 "OBJECTIVE DEVELOPMENT" shall mean OBJECTIVE DEVELOPMENT Software GmbH, +Grosse Schiffgasse 1A/7, 1020 Wien, AUSTRIA. + +1.2 "You" shall mean the Licensee. + +1.3 "V-USB" shall mean all files included in the package distributed under +the name "vusb" by OBJECTIVE DEVELOPMENT (http://www.obdev.at/vusb/) +unless otherwise noted. This includes the firmware-only USB device +implementation for Atmel AVR microcontrollers, some simple device examples +and host side software examples and libraries. + + +2 LICENSE GRANTS + +2.1 Source Code. OBJECTIVE DEVELOPMENT shall furnish you with the source +code of V-USB. + +2.2 Distribution and Use. OBJECTIVE DEVELOPMENT grants you the +non-exclusive right to use, copy and distribute V-USB with your hardware +product(s), restricted by the limitations in section 3 below. + +2.3 Modifications. OBJECTIVE DEVELOPMENT grants you the right to modify +the source code and your copy of V-USB according to your needs. + +2.4 USB IDs. OBJECTIVE DEVELOPMENT furnishes you with one or two USB +Product ID(s), sent to you in e-mail. These Product IDs are reserved +exclusively for you. OBJECTIVE DEVELOPMENT has obtained USB Product ID +ranges under the Vendor ID 5824 from Wouter van Ooijen (Van Ooijen +Technische Informatica, www.voti.nl) and under the Vendor ID 8352 from +Jason Kotzin (now flirc.tv, Inc.). Both owners of the Vendor IDs have +obtained these IDs from the USB Implementers Forum, Inc. (www.usb.org). +OBJECTIVE DEVELOPMENT disclaims all liability which might arise from the +assignment of USB IDs. + +2.5 USB Certification. Although not part of this agreement, we want to make +it clear that you cannot become USB certified when you use V-USB or a USB +Product ID assigned by OBJECTIVE DEVELOPMENT. AVR microcontrollers don't +meet the electrical specifications required by the USB specification and +the USB Implementers Forum certifies only members who bought a Vendor ID of +their own. + + +3 LICENSE RESTRICTIONS + +3.1 Number of Units. Only one of the following three definitions is +applicable. Which one is determined by the amount you pay to OBJECTIVE +DEVELOPMENT, see section 4 ("Payment") below. + +Hobby License: You may use V-USB according to section 2 above in no more +than 5 hardware units. These units must not be sold for profit. + +Entry Level License: You may use V-USB according to section 2 above in no +more than 150 hardware units. + +Professional License: You may use V-USB according to section 2 above in +any number of hardware units, except for large scale production ("unlimited +fair use"). Quantities below 10,000 units are not considered large scale +production. If your reach quantities which are obviously large scale +production, you must pay a license fee of 0.10 EUR per unit for all units +above 10,000. + +3.2 Rental. You may not rent, lease, or lend V-USB or otherwise encumber +any copy of V-USB, or any of the rights granted herein. + +3.3 Transfer. You may not transfer your rights under this Agreement to +another party without OBJECTIVE DEVELOPMENT's prior written consent. If +such consent is obtained, you may permanently transfer this License to +another party. The recipient of such transfer must agree to all terms and +conditions of this Agreement. + +3.4 Reservation of Rights. OBJECTIVE DEVELOPMENT retains all rights not +expressly granted. + +3.5 Non-Exclusive Rights. Your license rights under this Agreement are +non-exclusive. + +3.6 Third Party Rights. This Agreement cannot grant you rights controlled +by third parties. In particular, you are not allowed to use the USB logo or +other trademarks owned by the USB Implementers Forum, Inc. without their +consent. Since such consent depends on USB certification, it should be +noted that V-USB will not pass certification because it does not +implement checksum verification and the microcontroller ports do not meet +the electrical specifications. + + +4 PAYMENT + +The payment amount depends on the variation of this agreement (according to +section 3.1) into which you want to enter. Concrete prices are listed on +OBJECTIVE DEVELOPMENT's web site, usually at +http://www.obdev.at/vusb/license.html. You agree to pay the amount listed +there to OBJECTIVE DEVELOPMENT or OBJECTIVE DEVELOPMENT's payment processor +or reseller. + + +5 COPYRIGHT AND OWNERSHIP + +V-USB is protected by copyright laws and international copyright +treaties, as well as other intellectual property laws and treaties. V-USB +is licensed, not sold. + + +6 TERM AND TERMINATION + +6.1 Term. This Agreement shall continue indefinitely. However, OBJECTIVE +DEVELOPMENT may terminate this Agreement and revoke the granted license and +USB-IDs if you fail to comply with any of its terms and conditions. + +6.2 Survival of Terms. All provisions regarding secrecy, confidentiality +and limitation of liability shall survive termination of this agreement. + + +7 DISCLAIMER OF WARRANTY AND LIABILITY + +LIMITED WARRANTY. V-USB IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY +KIND. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, OBJECTIVE +DEVELOPMENT AND ITS SUPPLIERS HEREBY DISCLAIM ALL WARRANTIES, EITHER +EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND +NON-INFRINGEMENT, WITH REGARD TO V-USB, AND THE PROVISION OF OR FAILURE +TO PROVIDE SUPPORT SERVICES. THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL +RIGHTS. YOU MAY HAVE OTHERS, WHICH VARY FROM STATE/JURISDICTION TO +STATE/JURISDICTION. + +LIMITATION OF LIABILITY. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + <one line to give the program's name and a brief idea of what it does.> + Copyright (C) <year> <name of author> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + <signature of Ty Coon>, 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/usbdrv/Readme.txt b/usbdrv/Readme.txt new file mode 100644 index 0000000..970dc66 --- /dev/null +++ b/usbdrv/Readme.txt @@ -0,0 +1,172 @@ +This is the Readme file to Objective Development's firmware-only USB driver +for Atmel AVR microcontrollers. For more information please visit +http://www.obdev.at/vusb/ + +This directory contains the USB firmware only. Copy it as-is to your own +project and add all .c and .S files to your project (these files are marked +with an asterisk in the list below). Then copy usbconfig-prototype.h as +usbconfig.h to your project and edit it according to your configuration. + + +TECHNICAL DOCUMENTATION +======================= +The technical documentation (API) for the firmware driver is contained in the +file "usbdrv.h". Please read all of it carefully! Configuration options are +documented in "usbconfig-prototype.h". + +The driver consists of the following files: + Readme.txt ............. The file you are currently reading. + Changelog.txt .......... Release notes for all versions of the driver. + usbdrv.h ............... Driver interface definitions and technical docs. +* usbdrv.c ............... High level language part of the driver. Link this + module to your code! +* usbdrvasm.S ............ Assembler part of the driver. This module is mostly + a stub and includes one of the usbdrvasm*.S files + depending on processor clock. Link this module to + your code! + usbdrvasm*.inc ......... Assembler routines for particular clock frequencies. + Included by usbdrvasm.S, don't link it directly! + asmcommon.inc .......... Common assembler routines. Included by + usbdrvasm*.inc, don't link it directly! + usbconfig-prototype.h .. Prototype for your own usbdrv.h file. +* oddebug.c .............. Debug functions. Only used when DEBUG_LEVEL is + defined to a value greater than 0. Link this module + to your code! + oddebug.h .............. Interface definitions of the debug module. + usbportability.h ....... Header with compiler-dependent stuff. + usbdrvasm.asm .......... Compatibility stub for IAR-C-compiler. Use this + module instead of usbdrvasm.S when you assembler + with IAR's tools. + License.txt ............ Open Source license for this driver. + CommercialLicense.txt .. Optional commercial license for this driver. + USB-ID-FAQ.txt ......... General infos about USB Product- and Vendor-IDs. + USB-IDs-for-free.txt ... List and terms of use for free shared PIDs. + +(*) ... These files should be linked to your project. + + +CPU CORE CLOCK FREQUENCY +======================== +We supply assembler modules for clock frequencies of 12 MHz, 12.8 MHz, 15 MHz, +16 MHz, 16.5 MHz 18 MHz and 20 MHz. Other clock rates are not supported. The +actual clock rate must be configured in usbconfig.h. + +12 MHz Clock +This is the traditional clock rate of V-USB because it's the lowest clock +rate where the timing constraints of the USB spec can be met. + +15 MHz Clock +Similar to 12 MHz, but some NOPs inserted. On the other hand, the higher clock +rate allows for some loops which make the resulting code size somewhat smaller +than the 12 MHz version. + +16 MHz Clock +This clock rate has been added for users of the Arduino board and other +ready-made boards which come with a fixed 16 MHz crystal. It's also an option +if you need the slightly higher clock rate for performance reasons. Since +16 MHz is not divisible by the USB low speed bit clock of 1.5 MHz, the code +is somewhat tricky and has to insert a leap cycle every third byte. + +12.8 MHz and 16.5 MHz Clock +The assembler modules for these clock rates differ from the other modules +because they have been built for an RC oscillator with only 1% precision. The +receiver code inserts leap cycles to compensate for clock deviations. 1% is +also the precision which can be achieved by calibrating the internal RC +oscillator of the AVR. Please note that only AVRs with internal 64 MHz PLL +oscillator can reach 16.5 MHz with the RC oscillator. This includes the very +popular ATTiny25, ATTiny45, ATTiny85 series as well as the ATTiny26. Almost +all AVRs can reach 12.8 MHz, although this is outside the specified range. + +See the EasyLogger example at http://www.obdev.at/vusb/easylogger.html for +code which calibrates the RC oscillator based on the USB frame clock. + +18 MHz Clock +This module is closer to the USB specification because it performs an on the +fly CRC check for incoming packets. Packets with invalid checksum are +discarded as required by the spec. If you also implement checks for data +PID toggling on application level (see option USB_CFG_CHECK_DATA_TOGGLING +in usbconfig.h for more info), this ensures data integrity. Due to the CRC +tables and alignment requirements, this code is bigger than modules for other +clock rates. To activate this module, you must define USB_CFG_CHECK_CRC to 1 +and USB_CFG_CLOCK_KHZ to 18000 in usbconfig.h. + +20 MHz Clock +This module is for people who won't do it with less than the maximum. Since +20 MHz is not divisible by the USB low speed bit clock of 1.5 MHz, the code +uses similar tricks as the 16 MHz module to insert leap cycles. + + +USB IDENTIFIERS +=============== +Every USB device needs a vendor- and a product-identifier (VID and PID). VIDs +are obtained from usb.org for a price of 1,500 USD. Once you have a VID, you +can assign PIDs at will. + +Since an entry level cost of 1,500 USD is too high for most small companies +and hobbyists, we provide some VID/PID pairs for free. See the file +USB-IDs-for-free.txt for details. + +Objective Development also has some license offerings which include product +IDs. See http://www.obdev.at/vusb/ for details. + + +DEVELOPMENT SYSTEM +================== +This driver has been developed and optimized for the GNU compiler version 3 +and 4. We recommend that you use the GNU compiler suite because it is freely +available. V-USB has also been ported to the IAR compiler and assembler. It +has been tested with IAR 4.10B/W32 and 4.12A/W32 on an ATmega8 with the +"small" and "tiny" memory model. Not every release is tested with IAR CC and +the driver may therefore fail to compile with IAR. Please note that gcc is +more efficient for usbdrv.c because this module has been deliberately +optimized for gcc. + +Gcc version 3 produces smaller code than version 4 due to new optimizing +capabilities which don't always improve things on 8 bit CPUs. The code size +generated by gcc 4 can be reduced with the compiler options +-fno-move-loop-invariants, -fno-tree-scev-cprop and +-fno-inline-small-functions in addition to -Os. On devices with more than +8k of flash memory, we also recommend the linker option --relax (written as +-Wl,--relax for gcc) to convert absolute calls into relative where possible. + +For more information about optimizing options see: + + http://www.tty1.net/blog/2008-04-29-avr-gcc-optimisations_en.html + +These optimizations are good for gcc 4.x. Version 3.x of gcc does not support +most of these options and produces good code anyway. + + +USING V-USB FOR FREE +==================== +The AVR firmware driver is published under the GNU General Public License +Version 2 (GPL2) and the GNU General Public License Version 3 (GPL3). It is +your choice whether you apply the terms of version 2 or version 3. + +If you decide for the free GPL2 or GPL3, we STRONGLY ENCOURAGE you to do the +following things IN ADDITION to the obligations from the GPL: + +(1) Publish your entire project on a web site and drop us a note with the URL. +Use the form at http://www.obdev.at/vusb/feedback.html for your submission. +If you don't have a web site, you can publish the project in obdev's +documentation wiki at +http://www.obdev.at/goto.php?t=vusb-wiki&p=hosted-projects. + +(2) Adhere to minimum publication standards. Please include AT LEAST: + - a circuit diagram in PDF, PNG or GIF format + - full source code for the host software + - a Readme.txt file in ASCII format which describes the purpose of the + project and what can be found in which directories and which files + - a reference to http://www.obdev.at/vusb/ + +(3) If you improve the driver firmware itself, please give us a free license +to your modifications for our commercial license offerings. + + +COMMERCIAL LICENSES FOR V-USB +============================= +If you don't want to publish your source code under the terms of the GPL, +you can simply pay money for V-USB. As an additional benefit you get +USB PIDs for free, reserved exclusively to you. See the file +"CommercialLicense.txt" for details. + diff --git a/usbdrv/USB-ID-FAQ.txt b/usbdrv/USB-ID-FAQ.txt new file mode 100644 index 0000000..a4a6bd6 --- /dev/null +++ b/usbdrv/USB-ID-FAQ.txt @@ -0,0 +1,149 @@ +Version 2012-07-09 + +========================== +WHY DO WE NEED THESE IDs? +========================== + +USB is more than a low level protocol for data transport. It also defines a +common set of requests which must be understood by all devices. And as part +of these common requests, the specification defines data structures, the +USB Descriptors, which are used to describe the properties of the device. + +From the perspective of an operating system, it is therefore possible to find +out basic properties of a device (such as e.g. the manufacturer and the name +of the device) without a device-specific driver. This is essential because +the operating system can choose a driver to load based on this information +(Plug-And-Play). + +Among the most important properties in the Device Descriptor are the USB +Vendor- and Product-ID. Both are 16 bit integers. The most simple form of +driver matching is based on these IDs. The driver announces the Vendor- and +Product-IDs of the devices it can handle and the operating system loads the +appropriate driver when the device is connected. + +It is obvious that this technique only works if the pair Vendor- plus +Product-ID is unique: Only devices which require the same driver can have the +same pair of IDs. + + +===================================================== +HOW DOES THE USB STANDARD ENSURE THAT IDs ARE UNIQUE? +===================================================== + +Since it is so important that USB IDs are unique, the USB Implementers Forum, +Inc. (usb.org) needs a way to enforce this legally. It is not forbidden by +law to build a device and assign it any random numbers as IDs. Usb.org +therefore needs an agreement to regulate the use of USB IDs. The agreement +binds only parties who agreed to it, of course. Everybody else is free to use +any numbers for their IDs. + +So how can usb.org ensure that every manufacturer of USB devices enters into +an agreement with them? They do it via trademark licensing. Usb.org has +registered the trademark "USB", all associated logos and related terms. If +you want to put an USB logo on your product or claim that it is USB +compliant, you must license these trademarks from usb.org. And this is where +you enter into an agreement. See the "USB-IF Trademark License Agreement and +Usage Guidelines for the USB-IF Logo" at +http://www.usb.org/developers/logo_license/. + +Licensing the USB trademarks requires that you buy a USB Vendor-ID from +usb.org (one-time fee of ca. 2,000 USD), that you become a member of usb.org +(yearly fee of ca. 4,000 USD) and that you meet all the technical +specifications from the USB spec. + +This means that most hobbyists and small companies will never be able to +become USB compliant, just because membership is so expensive. And you can't +be compliant with a driver based on V-USB anyway, because the AVR's port pins +don't meet the electrical specifications for USB. So, in principle, all +hobbyists and small companies are free to choose any random numbers for their +IDs. They have nothing to lose... + +There is one exception worth noting, though: If you use a sub-component which +implements USB, the vendor of the sub-components may guarantee USB +compliance. This might apply to some or all of FTDI's solutions. + + +======================================================================= +WHY SHOULD YOU OBTAIN USB IDs EVEN IF YOU DON'T LICENSE USB TRADEMARKS? +======================================================================= + +You have learned in the previous section that you are free to choose any +numbers for your IDs anyway. So why not do exactly this? There is still the +technical issue. If you choose IDs which are already in use by somebody else, +operating systems will load the wrong drivers and your device won't work. +Even if you choose IDs which are not currently in use, they may be in use in +the next version of the operating system or even after an automatic update. + +So what you need is a pair of Vendor- and Product-IDs for which you have the +guarantee that no USB compliant product uses them. This implies that no +operating system will ever ship with drivers responsible for these IDs. + + +============================================== +HOW DOES OBJECTIVE DEVELOPMENT HANDLE USB IDs? +============================================== + +Objective Development gives away pairs of USB-IDs with their V-USB licenses. +In order to ensure that these IDs are unique, Objective Development has an +agreement with the company/person who has bought the USB Vendor-ID from +usb.org. This agreement ensures that a range of USB Product-IDs is reserved +for assignment by Objective Development and that the owner of the Vendor-ID +won't give it to anybody else. + +This means that you have to trust three parties to ensure uniqueness of +your IDs: + + - Objective Development, that they don't give the same PID to more than + one person. + - The owner of the Vendor-ID that they don't assign PIDs from the range + assigned to Objective Development to anybody else. + - Usb.org that they don't assign the same Vendor-ID a second time. + + +================================== +WHO IS THE OWNER OF THE VENDOR-ID? +================================== + +Objective Development has obtained ranges of USB Product-IDs under two +Vendor-IDs: Under Vendor-ID 5824 from Wouter van Ooijen (Van Ooijen +Technische Informatica, www.voti.nl) and under Vendor-ID 8352 from Jason +Kotzin (now flirc.tv, Inc.). Both VID owners have received their Vendor-ID +directly from usb.org. + + +========================================================================= +CAN I USE USB-IDs FROM OBJECTIVE DEVELOPMENT WITH OTHER DRIVERS/HARDWARE? +========================================================================= + +The short answer is: Yes. All you get is a guarantee that the IDs are never +assigned to anybody else. What more do you need? + + +============================ +WHAT ABOUT SHARED ID PAIRS? +============================ + +Objective Development has reserved some PID/VID pairs for shared use. You +have no guarantee of uniqueness for them, except that no USB compliant device +uses them. In order to avoid technical problems, we must ensure that all +devices with the same pair of IDs use the same driver on kernel level. For +details, see the file USB-IDs-for-free.txt. + + +====================================================== +I HAVE HEARD THAT SUB-LICENSING OF USB-IDs IS ILLEGAL? +====================================================== + +A 16 bit integer number cannot be protected by copyright laws. It is not +sufficiently complex. And since none of the parties involved entered into the +USB-IF Trademark License Agreement, we are not bound by this agreement. So +there is no reason why it should be illegal to sub-license USB-IDs. + + +============================================= +WHO IS LIABLE IF THERE ARE INCOMPATIBILITIES? +============================================= + +Objective Development disclaims all liabilities which might arise from the +assignment of IDs. If you guarantee product features to your customers +without proper disclaimer, YOU are liable for that. diff --git a/usbdrv/USB-IDs-for-free.txt b/usbdrv/USB-IDs-for-free.txt new file mode 100644 index 0000000..d46517d --- /dev/null +++ b/usbdrv/USB-IDs-for-free.txt @@ -0,0 +1,154 @@ +Version 2009-08-22 + +=========================== +FREE USB-IDs FOR SHARED USE +=========================== + +Objective Development has reserved a set of USB Product-IDs for use according +to the guidelines outlined below. For more information about the concept of +USB IDs please see the file USB-ID-FAQ.txt. Objective Development guarantees +that the IDs listed below are not used by any USB compliant devices. + + +==================== +MECHANISM OF SHARING +==================== + +From a technical point of view, two different devices can share the same USB +Vendor- and Product-ID if they require the same driver on operating system +level. We make use of this fact by assigning separate IDs for various device +classes. On application layer, devices must be distinguished by their textual +name or serial number. We offer separate sets of IDs for discrimination by +textual name and for serial number. + +Examples for shared use of USB IDs are included with V-USB in the "examples" +subdirectory. + + +====================================== +IDs FOR DISCRIMINATION BY TEXTUAL NAME +====================================== + +If you use one of the IDs listed below, your device and host-side software +must conform to these rules: + +(1) The USB device MUST provide a textual representation of the manufacturer +and product identification. The manufacturer identification MUST be available +at least in USB language 0x0409 (English/US). + +(2) The textual manufacturer identification MUST contain either an Internet +domain name (e.g. "mycompany.com") registered and owned by you, or an e-mail +address under your control (e.g. "myname@gmx.net"). You can embed the domain +name or e-mail address in any string you like, e.g. "Objective Development +http://www.obdev.at/vusb/". + +(3) You are responsible for retaining ownership of the domain or e-mail +address for as long as any of your products are in use. + +(4) You may choose any string for the textual product identification, as long +as this string is unique within the scope of your textual manufacturer +identification. + +(5) Application side device look-up MUST be based on the textual manufacturer +and product identification in addition to VID/PID matching. The driver +matching MUST be a comparison of the entire strings, NOT a sub-string match. + +(6) For devices which implement a particular USB device class (e.g. HID), the +operating system's default class driver MUST be used. If an operating system +driver for Vendor Class devices is needed, this driver must be libusb or +libusb-win32 (see http://libusb.org/ and +http://libusb-win32.sourceforge.net/). + +Table if IDs for discrimination by textual name: + +PID dec (hex) | VID dec (hex) | Description of use +==============+===============+============================================ +1500 (0x05dc) | 5824 (0x16c0) | For Vendor Class devices with libusb +--------------+---------------+-------------------------------------------- +1503 (0x05df) | 5824 (0x16c0) | For generic HID class devices (which are + | | NOT mice, keyboards or joysticks) +--------------+---------------+-------------------------------------------- +1505 (0x05e1) | 5824 (0x16c0) | For CDC-ACM class devices (modems) +--------------+---------------+-------------------------------------------- +1508 (0x05e4) | 5824 (0x16c0) | For MIDI class devices +--------------+---------------+-------------------------------------------- + +Note that Windows caches the textual product- and vendor-description for +mice, keyboards and joysticks. Name-bsed discrimination is therefore not +recommended for these device classes. + + +======================================= +IDs FOR DISCRIMINATION BY SERIAL NUMBER +======================================= + +If you use one of the IDs listed below, your device and host-side software +must conform to these rules: + +(1) The USB device MUST provide a textual representation of the serial +number, unless ONLY the operating system's default class driver is used. +The serial number string MUST be available at least in USB language 0x0409 +(English/US). + +(2) The serial number MUST start with either an Internet domain name (e.g. +"mycompany.com") registered and owned by you, or an e-mail address under your +control (e.g. "myname@gmx.net"), both terminated with a colon (":") character. +You MAY append any string you like for further discrimination of your devices. + +(3) You are responsible for retaining ownership of the domain or e-mail +address for as long as any of your products are in use. + +(5) Application side device look-up MUST be based on the serial number string +in addition to VID/PID matching. The matching must start at the first +character of the serial number string and include the colon character +terminating your domain or e-mail address. It MAY stop anywhere after that. + +(6) For devices which implement a particular USB device class (e.g. HID), the +operating system's default class driver MUST be used. If an operating system +driver for Vendor Class devices is needed, this driver must be libusb or +libusb-win32 (see http://libusb.org/ and +http://libusb-win32.sourceforge.net/). + +(7) If ONLY the operating system's default class driver is used, e.g. for +mice, keyboards, joysticks, CDC or MIDI devices and no discrimination by an +application is needed, the serial number may be omitted. + + +Table if IDs for discrimination by serial number string: + +PID dec (hex) | VID dec (hex) | Description of use +===============+===============+=========================================== +10200 (0x27d8) | 5824 (0x16c0) | For Vendor Class devices with libusb +---------------+---------------+------------------------------------------- +10201 (0x27d9) | 5824 (0x16c0) | For generic HID class devices (which are + | | NOT mice, keyboards or joysticks) +---------------+---------------+------------------------------------------- +10202 (0x27da) | 5824 (0x16c0) | For USB Mice +---------------+---------------+------------------------------------------- +10203 (0x27db) | 5824 (0x16c0) | For USB Keyboards +---------------+---------------+------------------------------------------- +10204 (0x27dc) | 5824 (0x16c0) | For USB Joysticks +---------------+---------------+------------------------------------------- +10205 (0x27dd) | 5824 (0x16c0) | For CDC-ACM class devices (modems) +---------------+---------------+------------------------------------------- +10206 (0x27de) | 5824 (0x16c0) | For MIDI class devices +---------------+---------------+------------------------------------------- + + +================= +ORIGIN OF USB-IDs +================= + +OBJECTIVE DEVELOPMENT Software GmbH has obtained all VID/PID pairs listed +here from Wouter van Ooijen (see www.voti.nl) for exclusive disposition. +Wouter van Ooijen has obtained the VID from the USB Implementers Forum, Inc. +(see www.usb.org). The VID is registered for the company name "Van Ooijen +Technische Informatica". + + +========== +DISCLAIMER +========== + +OBJECTIVE DEVELOPMENT Software GmbH disclaims all liability for any +problems which are caused by the shared use of these VID/PID pairs. diff --git a/usbdrv/asmcommon.inc b/usbdrv/asmcommon.inc new file mode 100644 index 0000000..d2a4f7c --- /dev/null +++ b/usbdrv/asmcommon.inc @@ -0,0 +1,187 @@ +/* Name: asmcommon.inc + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2007-11-05 + * Tabsize: 4 + * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* Do not link this file! Link usbdrvasm.S instead, which includes the + * appropriate implementation! + */ + +/* +General Description: +This file contains assembler code which is shared among the USB driver +implementations for different CPU cocks. Since the code must be inserted +in the middle of the module, it's split out into this file and #included. + +Jump destinations called from outside: + sofError: Called when no start sequence was found. + se0: Called when a package has been successfully received. + overflow: Called when receive buffer overflows. + doReturn: Called after sending data. + +Outside jump destinations used by this module: + waitForJ: Called to receive an already arriving packet. + sendAckAndReti: + sendNakAndReti: + sendCntAndReti: + usbSendAndReti: + +The following macros must be defined before this file is included: + .macro POP_STANDARD + .endm + .macro POP_RETI + .endm +*/ + +#define token x1 + +overflow: + ldi x2, 1<<USB_INTR_PENDING_BIT + USB_STORE_PENDING(x2) ; clear any pending interrupts +ignorePacket: + clr token + rjmp storeTokenAndReturn + +;---------------------------------------------------------------------------- +; Processing of received packet (numbers in brackets are cycles after center of SE0) +;---------------------------------------------------------------------------- +;This is the only non-error exit point for the software receiver loop +;we don't check any CRCs here because there is no time left. +se0: + subi cnt, USB_BUFSIZE ;[5] + neg cnt ;[6] + sub YL, cnt ;[7] + sbci YH, 0 ;[8] + ldi x2, 1<<USB_INTR_PENDING_BIT ;[9] + USB_STORE_PENDING(x2) ;[10] clear pending intr and check flag later. SE0 should be over. + ld token, y ;[11] + cpi token, USBPID_DATA0 ;[13] + breq handleData ;[14] + cpi token, USBPID_DATA1 ;[15] + breq handleData ;[16] + lds shift, usbDeviceAddr;[17] + ldd x2, y+1 ;[19] ADDR and 1 bit endpoint number + lsl x2 ;[21] shift out 1 bit endpoint number + cpse x2, shift ;[22] + rjmp ignorePacket ;[23] +/* only compute endpoint number in x3 if required later */ +#if USB_CFG_HAVE_INTRIN_ENDPOINT || USB_CFG_IMPLEMENT_FN_WRITEOUT + ldd x3, y+2 ;[24] endpoint number + crc + rol x3 ;[26] shift in LSB of endpoint +#endif + cpi token, USBPID_IN ;[27] + breq handleIn ;[28] + cpi token, USBPID_SETUP ;[29] + breq handleSetupOrOut ;[30] + cpi token, USBPID_OUT ;[31] + brne ignorePacket ;[32] must be ack, nak or whatever +; rjmp handleSetupOrOut ; fallthrough + +;Setup and Out are followed by a data packet two bit times (16 cycles) after +;the end of SE0. The sync code allows up to 40 cycles delay from the start of +;the sync pattern until the first bit is sampled. That's a total of 56 cycles. +handleSetupOrOut: ;[32] +#if USB_CFG_IMPLEMENT_FN_WRITEOUT /* if we have data for endpoint != 0, set usbCurrentTok to address */ + andi x3, 0xf ;[32] + breq storeTokenAndReturn ;[33] + mov token, x3 ;[34] indicate that this is endpoint x OUT +#endif +storeTokenAndReturn: + sts usbCurrentTok, token;[35] +doReturn: + POP_STANDARD ;[37] 12...16 cycles + USB_LOAD_PENDING(YL) ;[49] + sbrc YL, USB_INTR_PENDING_BIT;[50] check whether data is already arriving + rjmp waitForJ ;[51] save the pops and pushes -- a new interrupt is already pending +sofError: + POP_RETI ;macro call + reti + +handleData: +#if USB_CFG_CHECK_CRC + CRC_CLEANUP_AND_CHECK ; jumps to ignorePacket if CRC error +#endif + lds shift, usbCurrentTok;[18] + tst shift ;[20] + breq doReturn ;[21] + lds x2, usbRxLen ;[22] + tst x2 ;[24] + brne sendNakAndReti ;[25] +; 2006-03-11: The following two lines fix a problem where the device was not +; recognized if usbPoll() was called less frequently than once every 4 ms. + cpi cnt, 4 ;[26] zero sized data packets are status phase only -- ignore and ack + brmi sendAckAndReti ;[27] keep rx buffer clean -- we must not NAK next SETUP +#if USB_CFG_CHECK_DATA_TOGGLING + sts usbCurrentDataToken, token ; store for checking by C code +#endif + sts usbRxLen, cnt ;[28] store received data, swap buffers + sts usbRxToken, shift ;[30] + lds x2, usbInputBufOffset;[32] swap buffers + ldi cnt, USB_BUFSIZE ;[34] + sub cnt, x2 ;[35] + sts usbInputBufOffset, cnt;[36] buffers now swapped + rjmp sendAckAndReti ;[38] 40 + 17 = 57 until SOP + +handleIn: +;We don't send any data as long as the C code has not processed the current +;input data and potentially updated the output data. That's more efficient +;in terms of code size than clearing the tx buffers when a packet is received. + lds x1, usbRxLen ;[30] + cpi x1, 1 ;[32] negative values are flow control, 0 means "buffer free" + brge sendNakAndReti ;[33] unprocessed input packet? + ldi x1, USBPID_NAK ;[34] prepare value for usbTxLen +#if USB_CFG_HAVE_INTRIN_ENDPOINT + andi x3, 0xf ;[35] x3 contains endpoint +#if USB_CFG_SUPPRESS_INTR_CODE + brne sendNakAndReti ;[36] +#else + brne handleIn1 ;[36] +#endif +#endif + lds cnt, usbTxLen ;[37] + sbrc cnt, 4 ;[39] all handshake tokens have bit 4 set + rjmp sendCntAndReti ;[40] 42 + 16 = 58 until SOP + sts usbTxLen, x1 ;[41] x1 == USBPID_NAK from above + ldi YL, lo8(usbTxBuf) ;[43] + ldi YH, hi8(usbTxBuf) ;[44] + rjmp usbSendAndReti ;[45] 57 + 12 = 59 until SOP + +; Comment about when to set usbTxLen to USBPID_NAK: +; We should set it back when we receive the ACK from the host. This would +; be simple to implement: One static variable which stores whether the last +; tx was for endpoint 0 or 1 and a compare in the receiver to distinguish the +; ACK. However, we set it back immediately when we send the package, +; assuming that no error occurs and the host sends an ACK. We save one byte +; RAM this way and avoid potential problems with endless retries. The rest of +; the driver assumes error-free transfers anyway. + +#if !USB_CFG_SUPPRESS_INTR_CODE && USB_CFG_HAVE_INTRIN_ENDPOINT /* placed here due to relative jump range */ +handleIn1: ;[38] +#if USB_CFG_HAVE_INTRIN_ENDPOINT3 +; 2006-06-10 as suggested by O.Tamura: support second INTR IN / BULK IN endpoint + cpi x3, USB_CFG_EP3_NUMBER;[38] + breq handleIn3 ;[39] +#endif + lds cnt, usbTxLen1 ;[40] + sbrc cnt, 4 ;[42] all handshake tokens have bit 4 set + rjmp sendCntAndReti ;[43] 47 + 16 = 63 until SOP + sts usbTxLen1, x1 ;[44] x1 == USBPID_NAK from above + ldi YL, lo8(usbTxBuf1) ;[46] + ldi YH, hi8(usbTxBuf1) ;[47] + rjmp usbSendAndReti ;[48] 50 + 12 = 62 until SOP + +#if USB_CFG_HAVE_INTRIN_ENDPOINT3 +handleIn3: + lds cnt, usbTxLen3 ;[41] + sbrc cnt, 4 ;[43] + rjmp sendCntAndReti ;[44] 49 + 16 = 65 until SOP + sts usbTxLen3, x1 ;[45] x1 == USBPID_NAK from above + ldi YL, lo8(usbTxBuf3) ;[47] + ldi YH, hi8(usbTxBuf3) ;[48] + rjmp usbSendAndReti ;[49] 51 + 12 = 63 until SOP +#endif +#endif diff --git a/usbdrv/oddebug.c b/usbdrv/oddebug.c new file mode 100644 index 0000000..19bf142 --- /dev/null +++ b/usbdrv/oddebug.c @@ -0,0 +1,49 @@ +/* Name: oddebug.c + * Project: AVR library + * Author: Christian Starkjohann + * Creation Date: 2005-01-16 + * Tabsize: 4 + * Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +#include "oddebug.h" + +#if DEBUG_LEVEL > 0 + +#warning "Never compile production devices with debugging enabled" + +static void uartPutc(char c) +{ + while(!(ODDBG_USR & (1 << ODDBG_UDRE))); /* wait for data register empty */ + ODDBG_UDR = c; +} + +static uchar hexAscii(uchar h) +{ + h &= 0xf; + if(h >= 10) + h += 'a' - (uchar)10 - '0'; + h += '0'; + return h; +} + +static void printHex(uchar c) +{ + uartPutc(hexAscii(c >> 4)); + uartPutc(hexAscii(c)); +} + +void odDebug(uchar prefix, uchar *data, uchar len) +{ + printHex(prefix); + uartPutc(':'); + while(len--){ + uartPutc(' '); + printHex(*data++); + } + uartPutc('\r'); + uartPutc('\n'); +} + +#endif diff --git a/usbdrv/oddebug.h b/usbdrv/oddebug.h new file mode 100644 index 0000000..851f84d --- /dev/null +++ b/usbdrv/oddebug.h @@ -0,0 +1,122 @@ +/* Name: oddebug.h + * Project: AVR library + * Author: Christian Starkjohann + * Creation Date: 2005-01-16 + * Tabsize: 4 + * Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +#ifndef __oddebug_h_included__ +#define __oddebug_h_included__ + +/* +General Description: +This module implements a function for debug logs on the serial line of the +AVR microcontroller. Debugging can be configured with the define +'DEBUG_LEVEL'. If this macro is not defined or defined to 0, all debugging +calls are no-ops. If it is 1, DBG1 logs will appear, but not DBG2. If it is +2, DBG1 and DBG2 logs will be printed. + +A debug log consists of a label ('prefix') to indicate which debug log created +the output and a memory block to dump in hex ('data' and 'len'). +*/ + + +#ifndef F_CPU +# define F_CPU 12000000 /* 12 MHz */ +#endif + +/* make sure we have the UART defines: */ +#include "usbportability.h" + +#ifndef uchar +# define uchar unsigned char +#endif + +#if DEBUG_LEVEL > 0 && !(defined TXEN || defined TXEN0) /* no UART in device */ +# warning "Debugging disabled because device has no UART" +# undef DEBUG_LEVEL +#endif + +#ifndef DEBUG_LEVEL +# define DEBUG_LEVEL 0 +#endif + +/* ------------------------------------------------------------------------- */ + +#if DEBUG_LEVEL > 0 +# define DBG1(prefix, data, len) odDebug(prefix, data, len) +#else +# define DBG1(prefix, data, len) +#endif + +#if DEBUG_LEVEL > 1 +# define DBG2(prefix, data, len) odDebug(prefix, data, len) +#else +# define DBG2(prefix, data, len) +#endif + +/* ------------------------------------------------------------------------- */ + +#if DEBUG_LEVEL > 0 +extern void odDebug(uchar prefix, uchar *data, uchar len); + +/* Try to find our control registers; ATMEL likes to rename these */ + +#if defined UBRR +# define ODDBG_UBRR UBRR +#elif defined UBRRL +# define ODDBG_UBRR UBRRL +#elif defined UBRR0 +# define ODDBG_UBRR UBRR0 +#elif defined UBRR0L +# define ODDBG_UBRR UBRR0L +#endif + +#if defined UCR +# define ODDBG_UCR UCR +#elif defined UCSRB +# define ODDBG_UCR UCSRB +#elif defined UCSR0B +# define ODDBG_UCR UCSR0B +#endif + +#if defined TXEN +# define ODDBG_TXEN TXEN +#else +# define ODDBG_TXEN TXEN0 +#endif + +#if defined USR +# define ODDBG_USR USR +#elif defined UCSRA +# define ODDBG_USR UCSRA +#elif defined UCSR0A +# define ODDBG_USR UCSR0A +#endif + +#if defined UDRE +# define ODDBG_UDRE UDRE +#else +# define ODDBG_UDRE UDRE0 +#endif + +#if defined UDR +# define ODDBG_UDR UDR +#elif defined UDR0 +# define ODDBG_UDR UDR0 +#endif + +static inline void odDebugInit(void) +{ + ODDBG_UCR |= (1<<ODDBG_TXEN); + ODDBG_UBRR = F_CPU / (19200 * 16L) - 1; +} +#else +# define odDebugInit() +#endif + +/* ------------------------------------------------------------------------- */ + +#endif /* __oddebug_h_included__ */ diff --git a/usbdrv/usbconfig-prototype.h b/usbdrv/usbconfig-prototype.h new file mode 100644 index 0000000..93721c2 --- /dev/null +++ b/usbdrv/usbconfig-prototype.h @@ -0,0 +1,384 @@ +/* Name: usbconfig.h + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2005-04-01 + * Tabsize: 4 + * Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +#ifndef __usbconfig_h_included__ +#define __usbconfig_h_included__ + +/* +General Description: +This file is an example configuration (with inline documentation) for the USB +driver. It configures V-USB for USB D+ connected to Port D bit 2 (which is +also hardware interrupt 0 on many devices) and USB D- to Port D bit 4. You may +wire the lines to any other port, as long as D+ is also wired to INT0 (or any +other hardware interrupt, as long as it is the highest level interrupt, see +section at the end of this file). ++ To create your own usbconfig.h file, copy this file to your project's ++ firmware source directory) and rename it to "usbconfig.h". ++ Then edit it accordingly. +*/ + +/* ---------------------------- Hardware Config ---------------------------- */ + +#define USB_CFG_IOPORTNAME D +/* This is the port where the USB bus is connected. When you configure it to + * "B", the registers PORTB, PINB and DDRB will be used. + */ +#define USB_CFG_DMINUS_BIT 4 +/* This is the bit number in USB_CFG_IOPORT where the USB D- line is connected. + * This may be any bit in the port. + */ +#define USB_CFG_DPLUS_BIT 2 +/* This is the bit number in USB_CFG_IOPORT where the USB D+ line is connected. + * This may be any bit in the port. Please note that D+ must also be connected + * to interrupt pin INT0! [You can also use other interrupts, see section + * "Optional MCU Description" below, or you can connect D- to the interrupt, as + * it is required if you use the USB_COUNT_SOF feature. If you use D- for the + * interrupt, the USB interrupt will also be triggered at Start-Of-Frame + * markers every millisecond.] + */ +#define USB_CFG_CLOCK_KHZ (F_CPU/1000) +/* Clock rate of the AVR in kHz. Legal values are 12000, 12800, 15000, 16000, + * 16500, 18000 and 20000. The 12.8 MHz and 16.5 MHz versions of the code + * require no crystal, they tolerate +/- 1% deviation from the nominal + * frequency. All other rates require a precision of 2000 ppm and thus a + * crystal! + * Since F_CPU should be defined to your actual clock rate anyway, you should + * not need to modify this setting. + */ +#define USB_CFG_CHECK_CRC 0 +/* Define this to 1 if you want that the driver checks integrity of incoming + * data packets (CRC checks). CRC checks cost quite a bit of code size and are + * currently only available for 18 MHz crystal clock. You must choose + * USB_CFG_CLOCK_KHZ = 18000 if you enable this option. + */ + +/* ----------------------- Optional Hardware Config ------------------------ */ + +/* #define USB_CFG_PULLUP_IOPORTNAME D */ +/* If you connect the 1.5k pullup resistor from D- to a port pin instead of + * V+, you can connect and disconnect the device from firmware by calling + * the macros usbDeviceConnect() and usbDeviceDisconnect() (see usbdrv.h). + * This constant defines the port on which the pullup resistor is connected. + */ +/* #define USB_CFG_PULLUP_BIT 4 */ +/* This constant defines the bit number in USB_CFG_PULLUP_IOPORT (defined + * above) where the 1.5k pullup resistor is connected. See description + * above for details. + */ + +/* --------------------------- Functional Range ---------------------------- */ + +#define USB_CFG_HAVE_INTRIN_ENDPOINT 0 +/* Define this to 1 if you want to compile a version with two endpoints: The + * default control endpoint 0 and an interrupt-in endpoint (any other endpoint + * number). + */ +#define USB_CFG_HAVE_INTRIN_ENDPOINT3 0 +/* Define this to 1 if you want to compile a version with three endpoints: The + * default control endpoint 0, an interrupt-in endpoint 3 (or the number + * configured below) and a catch-all default interrupt-in endpoint as above. + * You must also define USB_CFG_HAVE_INTRIN_ENDPOINT to 1 for this feature. + */ +#define USB_CFG_EP3_NUMBER 3 +/* If the so-called endpoint 3 is used, it can now be configured to any other + * endpoint number (except 0) with this macro. Default if undefined is 3. + */ +/* #define USB_INITIAL_DATATOKEN USBPID_DATA1 */ +/* The above macro defines the startup condition for data toggling on the + * interrupt/bulk endpoints 1 and 3. Defaults to USBPID_DATA1. + * Since the token is toggled BEFORE sending any data, the first packet is + * sent with the oposite value of this configuration! + */ +#define USB_CFG_IMPLEMENT_HALT 0 +/* Define this to 1 if you also want to implement the ENDPOINT_HALT feature + * for endpoint 1 (interrupt endpoint). Although you may not need this feature, + * it is required by the standard. We have made it a config option because it + * bloats the code considerably. + */ +#define USB_CFG_SUPPRESS_INTR_CODE 0 +/* Define this to 1 if you want to declare interrupt-in endpoints, but don't + * want to send any data over them. If this macro is defined to 1, functions + * usbSetInterrupt() and usbSetInterrupt3() are omitted. This is useful if + * you need the interrupt-in endpoints in order to comply to an interface + * (e.g. HID), but never want to send any data. This option saves a couple + * of bytes in flash memory and the transmit buffers in RAM. + */ +#define USB_CFG_INTR_POLL_INTERVAL 10 +/* If you compile a version with endpoint 1 (interrupt-in), this is the poll + * interval. The value is in milliseconds and must not be less than 10 ms for + * low speed devices. + */ +#define USB_CFG_IS_SELF_POWERED 0 +/* Define this to 1 if the device has its own power supply. Set it to 0 if the + * device is powered from the USB bus. + */ +#define USB_CFG_MAX_BUS_POWER 100 +/* Set this variable to the maximum USB bus power consumption of your device. + * The value is in milliamperes. [It will be divided by two since USB + * communicates power requirements in units of 2 mA.] + */ +#define USB_CFG_IMPLEMENT_FN_WRITE 0 +/* Set this to 1 if you want usbFunctionWrite() to be called for control-out + * transfers. Set it to 0 if you don't need it and want to save a couple of + * bytes. + */ +#define USB_CFG_IMPLEMENT_FN_READ 0 +/* Set this to 1 if you need to send control replies which are generated + * "on the fly" when usbFunctionRead() is called. If you only want to send + * data from a static buffer, set it to 0 and return the data from + * usbFunctionSetup(). This saves a couple of bytes. + */ +#define USB_CFG_IMPLEMENT_FN_WRITEOUT 0 +/* Define this to 1 if you want to use interrupt-out (or bulk out) endpoints. + * You must implement the function usbFunctionWriteOut() which receives all + * interrupt/bulk data sent to any endpoint other than 0. The endpoint number + * can be found in 'usbRxToken'. + */ +#define USB_CFG_HAVE_FLOWCONTROL 0 +/* Define this to 1 if you want flowcontrol over USB data. See the definition + * of the macros usbDisableAllRequests() and usbEnableAllRequests() in + * usbdrv.h. + */ +#define USB_CFG_DRIVER_FLASH_PAGE 0 +/* If the device has more than 64 kBytes of flash, define this to the 64 k page + * where the driver's constants (descriptors) are located. Or in other words: + * Define this to 1 for boot loaders on the ATMega128. + */ +#define USB_CFG_LONG_TRANSFERS 0 +/* Define this to 1 if you want to send/receive blocks of more than 254 bytes + * in a single control-in or control-out transfer. Note that the capability + * for long transfers increases the driver size. + */ +/* #define USB_RX_USER_HOOK(data, len) if(usbRxToken == (uchar)USBPID_SETUP) blinkLED(); */ +/* This macro is a hook if you want to do unconventional things. If it is + * defined, it's inserted at the beginning of received message processing. + * If you eat the received message and don't want default processing to + * proceed, do a return after doing your things. One possible application + * (besides debugging) is to flash a status LED on each packet. + */ +/* #define USB_RESET_HOOK(resetStarts) if(!resetStarts){hadUsbReset();} */ +/* This macro is a hook if you need to know when an USB RESET occurs. It has + * one parameter which distinguishes between the start of RESET state and its + * end. + */ +/* #define USB_SET_ADDRESS_HOOK() hadAddressAssigned(); */ +/* This macro (if defined) is executed when a USB SET_ADDRESS request was + * received. + */ +#define USB_COUNT_SOF 0 +/* define this macro to 1 if you need the global variable "usbSofCount" which + * counts SOF packets. This feature requires that the hardware interrupt is + * connected to D- instead of D+. + */ +/* #ifdef __ASSEMBLER__ + * macro myAssemblerMacro + * in YL, TCNT0 + * sts timer0Snapshot, YL + * endm + * #endif + * #define USB_SOF_HOOK myAssemblerMacro + * This macro (if defined) is executed in the assembler module when a + * Start Of Frame condition is detected. It is recommended to define it to + * the name of an assembler macro which is defined here as well so that more + * than one assembler instruction can be used. The macro may use the register + * YL and modify SREG. If it lasts longer than a couple of cycles, USB messages + * immediately after an SOF pulse may be lost and must be retried by the host. + * What can you do with this hook? Since the SOF signal occurs exactly every + * 1 ms (unless the host is in sleep mode), you can use it to tune OSCCAL in + * designs running on the internal RC oscillator. + * Please note that Start Of Frame detection works only if D- is wired to the + * interrupt, not D+. THIS IS DIFFERENT THAN MOST EXAMPLES! + */ +#define USB_CFG_CHECK_DATA_TOGGLING 0 +/* define this macro to 1 if you want to filter out duplicate data packets + * sent by the host. Duplicates occur only as a consequence of communication + * errors, when the host does not receive an ACK. Please note that you need to + * implement the filtering yourself in usbFunctionWriteOut() and + * usbFunctionWrite(). Use the global usbCurrentDataToken and a static variable + * for each control- and out-endpoint to check for duplicate packets. + */ +#define USB_CFG_HAVE_MEASURE_FRAME_LENGTH 0 +/* define this macro to 1 if you want the function usbMeasureFrameLength() + * compiled in. This function can be used to calibrate the AVR's RC oscillator. + */ +#define USB_USE_FAST_CRC 0 +/* The assembler module has two implementations for the CRC algorithm. One is + * faster, the other is smaller. This CRC routine is only used for transmitted + * messages where timing is not critical. The faster routine needs 31 cycles + * per byte while the smaller one needs 61 to 69 cycles. The faster routine + * may be worth the 32 bytes bigger code size if you transmit lots of data and + * run the AVR close to its limit. + */ + +/* -------------------------- Device Description --------------------------- */ + +#define USB_CFG_VENDOR_ID 0xc0, 0x16 /* = 0x16c0 = 5824 = voti.nl */ +/* USB vendor ID for the device, low byte first. If you have registered your + * own Vendor ID, define it here. Otherwise you may use one of obdev's free + * shared VID/PID pairs. Be sure to read USB-IDs-for-free.txt for rules! + * *** IMPORTANT NOTE *** + * This template uses obdev's shared VID/PID pair for Vendor Class devices + * with libusb: 0x16c0/0x5dc. Use this VID/PID pair ONLY if you understand + * the implications! + */ +#define USB_CFG_DEVICE_ID 0xdc, 0x05 /* = 0x05dc = 1500 */ +/* This is the ID of the product, low byte first. It is interpreted in the + * scope of the vendor ID. If you have registered your own VID with usb.org + * or if you have licensed a PID from somebody else, define it here. Otherwise + * you may use one of obdev's free shared VID/PID pairs. See the file + * USB-IDs-for-free.txt for details! + * *** IMPORTANT NOTE *** + * This template uses obdev's shared VID/PID pair for Vendor Class devices + * with libusb: 0x16c0/0x5dc. Use this VID/PID pair ONLY if you understand + * the implications! + */ +#define USB_CFG_DEVICE_VERSION 0x00, 0x01 +/* Version number of the device: Minor number first, then major number. + */ +#define USB_CFG_VENDOR_NAME 'o', 'b', 'd', 'e', 'v', '.', 'a', 't' +#define USB_CFG_VENDOR_NAME_LEN 8 +/* These two values define the vendor name returned by the USB device. The name + * must be given as a list of characters under single quotes. The characters + * are interpreted as Unicode (UTF-16) entities. + * If you don't want a vendor name string, undefine these macros. + * ALWAYS define a vendor name containing your Internet domain name if you use + * obdev's free shared VID/PID pair. See the file USB-IDs-for-free.txt for + * details. + */ +#define USB_CFG_DEVICE_NAME 'T', 'e', 'm', 'p', 'l', 'a', 't', 'e' +#define USB_CFG_DEVICE_NAME_LEN 8 +/* Same as above for the device name. If you don't want a device name, undefine + * the macros. See the file USB-IDs-for-free.txt before you assign a name if + * you use a shared VID/PID. + */ +/*#define USB_CFG_SERIAL_NUMBER 'N', 'o', 'n', 'e' */ +/*#define USB_CFG_SERIAL_NUMBER_LEN 0 */ +/* Same as above for the serial number. If you don't want a serial number, + * undefine the macros. + * It may be useful to provide the serial number through other means than at + * compile time. See the section about descriptor properties below for how + * to fine tune control over USB descriptors such as the string descriptor + * for the serial number. + */ +#define USB_CFG_DEVICE_CLASS 0xff /* set to 0 if deferred to interface */ +#define USB_CFG_DEVICE_SUBCLASS 0 +/* See USB specification if you want to conform to an existing device class. + * Class 0xff is "vendor specific". + */ +#define USB_CFG_INTERFACE_CLASS 0 /* define class here if not at device level */ +#define USB_CFG_INTERFACE_SUBCLASS 0 +#define USB_CFG_INTERFACE_PROTOCOL 0 +/* See USB specification if you want to conform to an existing device class or + * protocol. The following classes must be set at interface level: + * HID class is 3, no subclass and protocol required (but may be useful!) + * CDC class is 2, use subclass 2 and protocol 1 for ACM + */ +/* #define USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH 42 */ +/* Define this to the length of the HID report descriptor, if you implement + * an HID device. Otherwise don't define it or define it to 0. + * If you use this define, you must add a PROGMEM character array named + * "usbHidReportDescriptor" to your code which contains the report descriptor. + * Don't forget to keep the array and this define in sync! + */ + +/* #define USB_PUBLIC static */ +/* Use the define above if you #include usbdrv.c instead of linking against it. + * This technique saves a couple of bytes in flash memory. + */ + +/* ------------------- Fine Control over USB Descriptors ------------------- */ +/* If you don't want to use the driver's default USB descriptors, you can + * provide our own. These can be provided as (1) fixed length static data in + * flash memory, (2) fixed length static data in RAM or (3) dynamically at + * runtime in the function usbFunctionDescriptor(). See usbdrv.h for more + * information about this function. + * Descriptor handling is configured through the descriptor's properties. If + * no properties are defined or if they are 0, the default descriptor is used. + * Possible properties are: + * + USB_PROP_IS_DYNAMIC: The data for the descriptor should be fetched + * at runtime via usbFunctionDescriptor(). If the usbMsgPtr mechanism is + * used, the data is in FLASH by default. Add property USB_PROP_IS_RAM if + * you want RAM pointers. + * + USB_PROP_IS_RAM: The data returned by usbFunctionDescriptor() or found + * in static memory is in RAM, not in flash memory. + * + USB_PROP_LENGTH(len): If the data is in static memory (RAM or flash), + * the driver must know the descriptor's length. The descriptor itself is + * found at the address of a well known identifier (see below). + * List of static descriptor names (must be declared PROGMEM if in flash): + * char usbDescriptorDevice[]; + * char usbDescriptorConfiguration[]; + * char usbDescriptorHidReport[]; + * char usbDescriptorString0[]; + * int usbDescriptorStringVendor[]; + * int usbDescriptorStringDevice[]; + * int usbDescriptorStringSerialNumber[]; + * Other descriptors can't be provided statically, they must be provided + * dynamically at runtime. + * + * Descriptor properties are or-ed or added together, e.g.: + * #define USB_CFG_DESCR_PROPS_DEVICE (USB_PROP_IS_RAM | USB_PROP_LENGTH(18)) + * + * The following descriptors are defined: + * USB_CFG_DESCR_PROPS_DEVICE + * USB_CFG_DESCR_PROPS_CONFIGURATION + * USB_CFG_DESCR_PROPS_STRINGS + * USB_CFG_DESCR_PROPS_STRING_0 + * USB_CFG_DESCR_PROPS_STRING_VENDOR + * USB_CFG_DESCR_PROPS_STRING_PRODUCT + * USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER + * USB_CFG_DESCR_PROPS_HID + * USB_CFG_DESCR_PROPS_HID_REPORT + * USB_CFG_DESCR_PROPS_UNKNOWN (for all descriptors not handled by the driver) + * + * Note about string descriptors: String descriptors are not just strings, they + * are Unicode strings prefixed with a 2 byte header. Example: + * int serialNumberDescriptor[] = { + * USB_STRING_DESCRIPTOR_HEADER(6), + * 'S', 'e', 'r', 'i', 'a', 'l' + * }; + */ + +#define USB_CFG_DESCR_PROPS_DEVICE 0 +#define USB_CFG_DESCR_PROPS_CONFIGURATION 0 +#define USB_CFG_DESCR_PROPS_STRINGS 0 +#define USB_CFG_DESCR_PROPS_STRING_0 0 +#define USB_CFG_DESCR_PROPS_STRING_VENDOR 0 +#define USB_CFG_DESCR_PROPS_STRING_PRODUCT 0 +#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER 0 +#define USB_CFG_DESCR_PROPS_HID 0 +#define USB_CFG_DESCR_PROPS_HID_REPORT 0 +#define USB_CFG_DESCR_PROPS_UNKNOWN 0 + + +#define usbMsgPtr_t unsigned short +/* If usbMsgPtr_t is not defined, it defaults to 'uchar *'. We define it to + * a scalar type here because gcc generates slightly shorter code for scalar + * arithmetics than for pointer arithmetics. Remove this define for backward + * type compatibility or define it to an 8 bit type if you use data in RAM only + * and all RAM is below 256 bytes (tiny memory model in IAR CC). + */ + +/* ----------------------- Optional MCU Description ------------------------ */ + +/* The following configurations have working defaults in usbdrv.h. You + * usually don't need to set them explicitly. Only if you want to run + * the driver on a device which is not yet supported or with a compiler + * which is not fully supported (such as IAR C) or if you use a differnt + * interrupt than INT0, you may have to define some of these. + */ +/* #define USB_INTR_CFG MCUCR */ +/* #define USB_INTR_CFG_SET ((1 << ISC00) | (1 << ISC01)) */ +/* #define USB_INTR_CFG_CLR 0 */ +/* #define USB_INTR_ENABLE GIMSK */ +/* #define USB_INTR_ENABLE_BIT INT0 */ +/* #define USB_INTR_PENDING GIFR */ +/* #define USB_INTR_PENDING_BIT INTF0 */ +/* #define USB_INTR_VECTOR INT0_vect */ + +#endif /* __usbconfig_h_included__ */ diff --git a/usbdrv/usbdrv.c b/usbdrv/usbdrv.c new file mode 100644 index 0000000..d838935 --- /dev/null +++ b/usbdrv/usbdrv.c @@ -0,0 +1,628 @@ +/* Name: usbdrv.c + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2004-12-29 + * Tabsize: 4 + * Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +#include "usbdrv.h" +#include "oddebug.h" + +/* +General Description: +This module implements the C-part of the USB driver. See usbdrv.h for a +documentation of the entire driver. +*/ + +/* ------------------------------------------------------------------------- */ + +/* raw USB registers / interface to assembler code: */ +uchar usbRxBuf[2*USB_BUFSIZE]; /* raw RX buffer: PID, 8 bytes data, 2 bytes CRC */ +uchar usbInputBufOffset; /* offset in usbRxBuf used for low level receiving */ +uchar usbDeviceAddr; /* assigned during enumeration, defaults to 0 */ +uchar usbNewDeviceAddr; /* device ID which should be set after status phase */ +uchar usbConfiguration; /* currently selected configuration. Administered by driver, but not used */ +volatile schar usbRxLen; /* = 0; number of bytes in usbRxBuf; 0 means free, -1 for flow control */ +uchar usbCurrentTok; /* last token received or endpoint number for last OUT token if != 0 */ +uchar usbRxToken; /* token for data we received; or endpont number for last OUT */ +volatile uchar usbTxLen = USBPID_NAK; /* number of bytes to transmit with next IN token or handshake token */ +uchar usbTxBuf[USB_BUFSIZE];/* data to transmit with next IN, free if usbTxLen contains handshake token */ +#if USB_COUNT_SOF +volatile uchar usbSofCount; /* incremented by assembler module every SOF */ +#endif +#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE +usbTxStatus_t usbTxStatus1; +# if USB_CFG_HAVE_INTRIN_ENDPOINT3 +usbTxStatus_t usbTxStatus3; +# endif +#endif +#if USB_CFG_CHECK_DATA_TOGGLING +uchar usbCurrentDataToken;/* when we check data toggling to ignore duplicate packets */ +#endif + +/* USB status registers / not shared with asm code */ +usbMsgPtr_t usbMsgPtr; /* data to transmit next -- ROM or RAM address */ +static usbMsgLen_t usbMsgLen = USB_NO_MSG; /* remaining number of bytes */ +static uchar usbMsgFlags; /* flag values see below */ + +#define USB_FLG_MSGPTR_IS_ROM (1<<6) +#define USB_FLG_USE_USER_RW (1<<7) + +/* +optimizing hints: +- do not post/pre inc/dec integer values in operations +- assign value of USB_READ_FLASH() to register variables and don't use side effects in arg +- use narrow scope for variables which should be in X/Y/Z register +- assign char sized expressions to variables to force 8 bit arithmetics +*/ + +/* -------------------------- String Descriptors --------------------------- */ + +#if USB_CFG_DESCR_PROPS_STRINGS == 0 + +#if USB_CFG_DESCR_PROPS_STRING_0 == 0 +#undef USB_CFG_DESCR_PROPS_STRING_0 +#define USB_CFG_DESCR_PROPS_STRING_0 sizeof(usbDescriptorString0) +PROGMEM const char usbDescriptorString0[] = { /* language descriptor */ + 4, /* sizeof(usbDescriptorString0): length of descriptor in bytes */ + 3, /* descriptor type */ + 0x09, 0x04, /* language index (0x0409 = US-English) */ +}; +#endif + +#if USB_CFG_DESCR_PROPS_STRING_VENDOR == 0 && USB_CFG_VENDOR_NAME_LEN +#undef USB_CFG_DESCR_PROPS_STRING_VENDOR +#define USB_CFG_DESCR_PROPS_STRING_VENDOR sizeof(usbDescriptorStringVendor) +PROGMEM const int usbDescriptorStringVendor[] = { + USB_STRING_DESCRIPTOR_HEADER(USB_CFG_VENDOR_NAME_LEN), + USB_CFG_VENDOR_NAME +}; +#endif + +#if USB_CFG_DESCR_PROPS_STRING_PRODUCT == 0 && USB_CFG_DEVICE_NAME_LEN +#undef USB_CFG_DESCR_PROPS_STRING_PRODUCT +#define USB_CFG_DESCR_PROPS_STRING_PRODUCT sizeof(usbDescriptorStringDevice) +PROGMEM const int usbDescriptorStringDevice[] = { + USB_STRING_DESCRIPTOR_HEADER(USB_CFG_DEVICE_NAME_LEN), + USB_CFG_DEVICE_NAME +}; +#endif + +#if USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER == 0 && USB_CFG_SERIAL_NUMBER_LEN +#undef USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER +#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER sizeof(usbDescriptorStringSerialNumber) +PROGMEM const int usbDescriptorStringSerialNumber[] = { + USB_STRING_DESCRIPTOR_HEADER(USB_CFG_SERIAL_NUMBER_LEN), + USB_CFG_SERIAL_NUMBER +}; +#endif + +#endif /* USB_CFG_DESCR_PROPS_STRINGS == 0 */ + +/* --------------------------- Device Descriptor --------------------------- */ + +#if USB_CFG_DESCR_PROPS_DEVICE == 0 +#undef USB_CFG_DESCR_PROPS_DEVICE +#define USB_CFG_DESCR_PROPS_DEVICE sizeof(usbDescriptorDevice) +PROGMEM const char usbDescriptorDevice[] = { /* USB device descriptor */ + 18, /* sizeof(usbDescriptorDevice): length of descriptor in bytes */ + USBDESCR_DEVICE, /* descriptor type */ + 0x10, 0x01, /* USB version supported */ + USB_CFG_DEVICE_CLASS, + USB_CFG_DEVICE_SUBCLASS, + 0, /* protocol */ + 8, /* max packet size */ + /* the following two casts affect the first byte of the constant only, but + * that's sufficient to avoid a warning with the default values. + */ + (char)USB_CFG_VENDOR_ID,/* 2 bytes */ + (char)USB_CFG_DEVICE_ID,/* 2 bytes */ + USB_CFG_DEVICE_VERSION, /* 2 bytes */ + USB_CFG_DESCR_PROPS_STRING_VENDOR != 0 ? 1 : 0, /* manufacturer string index */ + USB_CFG_DESCR_PROPS_STRING_PRODUCT != 0 ? 2 : 0, /* product string index */ + USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER != 0 ? 3 : 0, /* serial number string index */ + 1, /* number of configurations */ +}; +#endif + +/* ----------------------- Configuration Descriptor ------------------------ */ + +#if USB_CFG_DESCR_PROPS_HID_REPORT != 0 && USB_CFG_DESCR_PROPS_HID == 0 +#undef USB_CFG_DESCR_PROPS_HID +#define USB_CFG_DESCR_PROPS_HID 9 /* length of HID descriptor in config descriptor below */ +#endif + +#if USB_CFG_DESCR_PROPS_CONFIGURATION == 0 +#undef USB_CFG_DESCR_PROPS_CONFIGURATION +#define USB_CFG_DESCR_PROPS_CONFIGURATION sizeof(usbDescriptorConfiguration) +PROGMEM const char usbDescriptorConfiguration[] = { /* USB configuration descriptor */ + 9, /* sizeof(usbDescriptorConfiguration): length of descriptor in bytes */ + USBDESCR_CONFIG, /* descriptor type */ + 18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT3 + + (USB_CFG_DESCR_PROPS_HID & 0xff), 0, + /* total length of data returned (including inlined descriptors) */ + 1, /* number of interfaces in this configuration */ + 1, /* index of this configuration */ + 0, /* configuration name string index */ +#if USB_CFG_IS_SELF_POWERED + (1 << 7) | USBATTR_SELFPOWER, /* attributes */ +#else + (1 << 7), /* attributes */ +#endif + USB_CFG_MAX_BUS_POWER/2, /* max USB current in 2mA units */ +/* interface descriptor follows inline: */ + 9, /* sizeof(usbDescrInterface): length of descriptor in bytes */ + USBDESCR_INTERFACE, /* descriptor type */ + 0, /* index of this interface */ + 0, /* alternate setting for this interface */ + USB_CFG_HAVE_INTRIN_ENDPOINT + USB_CFG_HAVE_INTRIN_ENDPOINT3, /* endpoints excl 0: number of endpoint descriptors to follow */ + USB_CFG_INTERFACE_CLASS, + USB_CFG_INTERFACE_SUBCLASS, + USB_CFG_INTERFACE_PROTOCOL, + 0, /* string index for interface */ +#if (USB_CFG_DESCR_PROPS_HID & 0xff) /* HID descriptor */ + 9, /* sizeof(usbDescrHID): length of descriptor in bytes */ + USBDESCR_HID, /* descriptor type: HID */ + 0x01, 0x01, /* BCD representation of HID version */ + 0x00, /* target country code */ + 0x01, /* number of HID Report (or other HID class) Descriptor infos to follow */ + 0x22, /* descriptor type: report */ + USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0, /* total length of report descriptor */ +#endif +#if USB_CFG_HAVE_INTRIN_ENDPOINT /* endpoint descriptor for endpoint 1 */ + 7, /* sizeof(usbDescrEndpoint) */ + USBDESCR_ENDPOINT, /* descriptor type = endpoint */ + (char)0x81, /* IN endpoint number 1 */ + 0x03, /* attrib: Interrupt endpoint */ + 8, 0, /* maximum packet size */ + USB_CFG_INTR_POLL_INTERVAL, /* in ms */ +#endif +#if USB_CFG_HAVE_INTRIN_ENDPOINT3 /* endpoint descriptor for endpoint 3 */ + 7, /* sizeof(usbDescrEndpoint) */ + USBDESCR_ENDPOINT, /* descriptor type = endpoint */ + (char)(0x80 | USB_CFG_EP3_NUMBER), /* IN endpoint number 3 */ + 0x03, /* attrib: Interrupt endpoint */ + 8, 0, /* maximum packet size */ + USB_CFG_INTR_POLL_INTERVAL, /* in ms */ +#endif +}; +#endif + +/* ------------------------------------------------------------------------- */ + +static inline void usbResetDataToggling(void) +{ +#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE + USB_SET_DATATOKEN1(USB_INITIAL_DATATOKEN); /* reset data toggling for interrupt endpoint */ +# if USB_CFG_HAVE_INTRIN_ENDPOINT3 + USB_SET_DATATOKEN3(USB_INITIAL_DATATOKEN); /* reset data toggling for interrupt endpoint */ +# endif +#endif +} + +static inline void usbResetStall(void) +{ +#if USB_CFG_IMPLEMENT_HALT && USB_CFG_HAVE_INTRIN_ENDPOINT + usbTxLen1 = USBPID_NAK; +#if USB_CFG_HAVE_INTRIN_ENDPOINT3 + usbTxLen3 = USBPID_NAK; +#endif +#endif +} + +/* ------------------------------------------------------------------------- */ + +#if !USB_CFG_SUPPRESS_INTR_CODE +#if USB_CFG_HAVE_INTRIN_ENDPOINT +static void usbGenericSetInterrupt(uchar *data, uchar len, usbTxStatus_t *txStatus) +{ +uchar *p; +char i; + +#if USB_CFG_IMPLEMENT_HALT + if(usbTxLen1 == USBPID_STALL) + return; +#endif + if(txStatus->len & 0x10){ /* packet buffer was empty */ + txStatus->buffer[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */ + }else{ + txStatus->len = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */ + } + p = txStatus->buffer + 1; + i = len; + do{ /* if len == 0, we still copy 1 byte, but that's no problem */ + *p++ = *data++; + }while(--i > 0); /* loop control at the end is 2 bytes shorter than at beginning */ + usbCrc16Append(&txStatus->buffer[1], len); + txStatus->len = len + 4; /* len must be given including sync byte */ + DBG2(0x21 + (((int)txStatus >> 3) & 3), txStatus->buffer, len + 3); +} + +USB_PUBLIC void usbSetInterrupt(uchar *data, uchar len) +{ + usbGenericSetInterrupt(data, len, &usbTxStatus1); +} +#endif + +#if USB_CFG_HAVE_INTRIN_ENDPOINT3 +USB_PUBLIC void usbSetInterrupt3(uchar *data, uchar len) +{ + usbGenericSetInterrupt(data, len, &usbTxStatus3); +} +#endif +#endif /* USB_CFG_SUPPRESS_INTR_CODE */ + +/* ------------------ utilities for code following below ------------------- */ + +/* Use defines for the switch statement so that we can choose between an + * if()else if() and a switch/case based implementation. switch() is more + * efficient for a LARGE set of sequential choices, if() is better in all other + * cases. + */ +#if USB_CFG_USE_SWITCH_STATEMENT +# define SWITCH_START(cmd) switch(cmd){{ +# define SWITCH_CASE(value) }break; case (value):{ +# define SWITCH_CASE2(v1,v2) }break; case (v1): case(v2):{ +# define SWITCH_CASE3(v1,v2,v3) }break; case (v1): case(v2): case(v3):{ +# define SWITCH_DEFAULT }break; default:{ +# define SWITCH_END }} +#else +# define SWITCH_START(cmd) {uchar _cmd = cmd; if(0){ +# define SWITCH_CASE(value) }else if(_cmd == (value)){ +# define SWITCH_CASE2(v1,v2) }else if(_cmd == (v1) || _cmd == (v2)){ +# define SWITCH_CASE3(v1,v2,v3) }else if(_cmd == (v1) || _cmd == (v2) || (_cmd == v3)){ +# define SWITCH_DEFAULT }else{ +# define SWITCH_END }} +#endif + +#ifndef USB_RX_USER_HOOK +#define USB_RX_USER_HOOK(data, len) +#endif +#ifndef USB_SET_ADDRESS_HOOK +#define USB_SET_ADDRESS_HOOK() +#endif + +/* ------------------------------------------------------------------------- */ + +/* We use if() instead of #if in the macro below because #if can't be used + * in macros and the compiler optimizes constant conditions anyway. + * This may cause problems with undefined symbols if compiled without + * optimizing! + */ +#define GET_DESCRIPTOR(cfgProp, staticName) \ + if(cfgProp){ \ + if((cfgProp) & USB_PROP_IS_RAM) \ + flags = 0; \ + if((cfgProp) & USB_PROP_IS_DYNAMIC){ \ + len = usbFunctionDescriptor(rq); \ + }else{ \ + len = USB_PROP_LENGTH(cfgProp); \ + usbMsgPtr = (usbMsgPtr_t)(staticName); \ + } \ + } + +/* usbDriverDescriptor() is similar to usbFunctionDescriptor(), but used + * internally for all types of descriptors. + */ +static inline usbMsgLen_t usbDriverDescriptor(usbRequest_t *rq) +{ +usbMsgLen_t len = 0; +uchar flags = USB_FLG_MSGPTR_IS_ROM; + + SWITCH_START(rq->wValue.bytes[1]) + SWITCH_CASE(USBDESCR_DEVICE) /* 1 */ + GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_DEVICE, usbDescriptorDevice) + SWITCH_CASE(USBDESCR_CONFIG) /* 2 */ + GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_CONFIGURATION, usbDescriptorConfiguration) + SWITCH_CASE(USBDESCR_STRING) /* 3 */ +#if USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC + if(USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_RAM) + flags = 0; + len = usbFunctionDescriptor(rq); +#else /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */ + SWITCH_START(rq->wValue.bytes[0]) + SWITCH_CASE(0) + GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_0, usbDescriptorString0) + SWITCH_CASE(1) + GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_VENDOR, usbDescriptorStringVendor) + SWITCH_CASE(2) + GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_PRODUCT, usbDescriptorStringDevice) + SWITCH_CASE(3) + GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER, usbDescriptorStringSerialNumber) + SWITCH_DEFAULT + if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){ + len = usbFunctionDescriptor(rq); + } + SWITCH_END +#endif /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */ +#if USB_CFG_DESCR_PROPS_HID_REPORT /* only support HID descriptors if enabled */ + SWITCH_CASE(USBDESCR_HID) /* 0x21 */ + GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID, usbDescriptorConfiguration + 18) + SWITCH_CASE(USBDESCR_HID_REPORT)/* 0x22 */ + GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID_REPORT, usbDescriptorHidReport) +#endif + SWITCH_DEFAULT + if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){ + len = usbFunctionDescriptor(rq); + } + SWITCH_END + usbMsgFlags = flags; + return len; +} + +/* ------------------------------------------------------------------------- */ + +/* usbDriverSetup() is similar to usbFunctionSetup(), but it's used for + * standard requests instead of class and custom requests. + */ +static inline usbMsgLen_t usbDriverSetup(usbRequest_t *rq) +{ +usbMsgLen_t len = 0; +uchar *dataPtr = usbTxBuf + 9; /* there are 2 bytes free space at the end of the buffer */ +uchar value = rq->wValue.bytes[0]; +#if USB_CFG_IMPLEMENT_HALT +uchar index = rq->wIndex.bytes[0]; +#endif + + dataPtr[0] = 0; /* default reply common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */ + SWITCH_START(rq->bRequest) + SWITCH_CASE(USBRQ_GET_STATUS) /* 0 */ + uchar recipient = rq->bmRequestType & USBRQ_RCPT_MASK; /* assign arith ops to variables to enforce byte size */ + if(USB_CFG_IS_SELF_POWERED && recipient == USBRQ_RCPT_DEVICE) + dataPtr[0] = USB_CFG_IS_SELF_POWERED; +#if USB_CFG_IMPLEMENT_HALT + if(recipient == USBRQ_RCPT_ENDPOINT && index == 0x81) /* request status for endpoint 1 */ + dataPtr[0] = usbTxLen1 == USBPID_STALL; +#endif + dataPtr[1] = 0; + len = 2; +#if USB_CFG_IMPLEMENT_HALT + SWITCH_CASE2(USBRQ_CLEAR_FEATURE, USBRQ_SET_FEATURE) /* 1, 3 */ + if(value == 0 && index == 0x81){ /* feature 0 == HALT for endpoint == 1 */ + usbTxLen1 = rq->bRequest == USBRQ_CLEAR_FEATURE ? USBPID_NAK : USBPID_STALL; + usbResetDataToggling(); + } +#endif + SWITCH_CASE(USBRQ_SET_ADDRESS) /* 5 */ + usbNewDeviceAddr = value; + USB_SET_ADDRESS_HOOK(); + SWITCH_CASE(USBRQ_GET_DESCRIPTOR) /* 6 */ + len = usbDriverDescriptor(rq); + goto skipMsgPtrAssignment; + SWITCH_CASE(USBRQ_GET_CONFIGURATION) /* 8 */ + dataPtr = &usbConfiguration; /* send current configuration value */ + len = 1; + SWITCH_CASE(USBRQ_SET_CONFIGURATION) /* 9 */ + usbConfiguration = value; + usbResetStall(); + SWITCH_CASE(USBRQ_GET_INTERFACE) /* 10 */ + len = 1; +#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE + SWITCH_CASE(USBRQ_SET_INTERFACE) /* 11 */ + usbResetDataToggling(); + usbResetStall(); +#endif + SWITCH_DEFAULT /* 7=SET_DESCRIPTOR, 12=SYNC_FRAME */ + /* Should we add an optional hook here? */ + SWITCH_END + usbMsgPtr = (usbMsgPtr_t)dataPtr; +skipMsgPtrAssignment: + return len; +} + +/* ------------------------------------------------------------------------- */ + +/* usbProcessRx() is called for every message received by the interrupt + * routine. It distinguishes between SETUP and DATA packets and processes + * them accordingly. + */ +static inline void usbProcessRx(uchar *data, uchar len) +{ +usbRequest_t *rq = (void *)data; + +/* usbRxToken can be: + * 0x2d 00101101 (USBPID_SETUP for setup data) + * 0xe1 11100001 (USBPID_OUT: data phase of setup transfer) + * 0...0x0f for OUT on endpoint X + */ + DBG2(0x10 + (usbRxToken & 0xf), data, len + 2); /* SETUP=1d, SETUP-DATA=11, OUTx=1x */ + USB_RX_USER_HOOK(data, len) +#if USB_CFG_IMPLEMENT_FN_WRITEOUT + if(usbRxToken < 0x10){ /* OUT to endpoint != 0: endpoint number in usbRxToken */ + usbFunctionWriteOut(data, len); + return; + } +#endif + if(usbRxToken == (uchar)USBPID_SETUP){ + if(len != 8) /* Setup size must be always 8 bytes. Ignore otherwise. */ + return; + usbMsgLen_t replyLen; + usbTxBuf[0] = USBPID_DATA0; /* initialize data toggling */ + usbTxLen = USBPID_NAK; /* abort pending transmit */ + usbMsgFlags = 0; + uchar type = rq->bmRequestType & USBRQ_TYPE_MASK; + if(type != USBRQ_TYPE_STANDARD){ /* standard requests are handled by driver */ + replyLen = usbFunctionSetup(data); + }else{ + replyLen = usbDriverSetup(rq); + } +#if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE + if(replyLen == USB_NO_MSG){ /* use user-supplied read/write function */ + /* do some conditioning on replyLen, but on IN transfers only */ + if((rq->bmRequestType & USBRQ_DIR_MASK) != USBRQ_DIR_HOST_TO_DEVICE){ + if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */ + replyLen = rq->wLength.bytes[0]; + }else{ + replyLen = rq->wLength.word; + } + } + usbMsgFlags = USB_FLG_USE_USER_RW; + }else /* The 'else' prevents that we limit a replyLen of USB_NO_MSG to the maximum transfer len. */ +#endif + if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */ + if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0]) /* limit length to max */ + replyLen = rq->wLength.bytes[0]; + }else{ + if(replyLen > rq->wLength.word) /* limit length to max */ + replyLen = rq->wLength.word; + } + usbMsgLen = replyLen; + }else{ /* usbRxToken must be USBPID_OUT, which means data phase of setup (control-out) */ +#if USB_CFG_IMPLEMENT_FN_WRITE + if(usbMsgFlags & USB_FLG_USE_USER_RW){ + uchar rval = usbFunctionWrite(data, len); + if(rval == 0xff){ /* an error occurred */ + usbTxLen = USBPID_STALL; + }else if(rval != 0){ /* This was the final package */ + usbMsgLen = 0; /* answer with a zero-sized data packet */ + } + } +#endif + } +} + +/* ------------------------------------------------------------------------- */ + +/* This function is similar to usbFunctionRead(), but it's also called for + * data handled automatically by the driver (e.g. descriptor reads). + */ +static uchar usbDeviceRead(uchar *data, uchar len) +{ + if(len > 0){ /* don't bother app with 0 sized reads */ +#if USB_CFG_IMPLEMENT_FN_READ + if(usbMsgFlags & USB_FLG_USE_USER_RW){ + len = usbFunctionRead(data, len); + }else +#endif + { + uchar i = len; + usbMsgPtr_t r = usbMsgPtr; + if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){ /* ROM data */ + do{ + uchar c = USB_READ_FLASH(r); /* assign to char size variable to enforce byte ops */ + *data++ = c; + r++; + }while(--i); + }else{ /* RAM data */ + do{ + *data++ = *((uchar *)r); + r++; + }while(--i); + } + usbMsgPtr = r; + } + } + return len; +} + +/* ------------------------------------------------------------------------- */ + +/* usbBuildTxBlock() is called when we have data to transmit and the + * interrupt routine's transmit buffer is empty. + */ +static inline void usbBuildTxBlock(void) +{ +usbMsgLen_t wantLen; +uchar len; + + wantLen = usbMsgLen; + if(wantLen > 8) + wantLen = 8; + usbMsgLen -= wantLen; + usbTxBuf[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* DATA toggling */ + len = usbDeviceRead(usbTxBuf + 1, wantLen); + if(len <= 8){ /* valid data packet */ + usbCrc16Append(&usbTxBuf[1], len); + len += 4; /* length including sync byte */ + if(len < 12) /* a partial package identifies end of message */ + usbMsgLen = USB_NO_MSG; + }else{ + len = USBPID_STALL; /* stall the endpoint */ + usbMsgLen = USB_NO_MSG; + } + usbTxLen = len; + DBG2(0x20, usbTxBuf, len-1); +} + +/* ------------------------------------------------------------------------- */ + +static inline void usbHandleResetHook(uchar notResetState) +{ +#ifdef USB_RESET_HOOK +static uchar wasReset; +uchar isReset = !notResetState; + + if(wasReset != isReset){ + USB_RESET_HOOK(isReset); + wasReset = isReset; + } +#else + notResetState = notResetState; // avoid compiler warning +#endif +} + +/* ------------------------------------------------------------------------- */ + +USB_PUBLIC void usbPoll(void) +{ +schar len; +uchar i; + + len = usbRxLen - 3; + if(len >= 0){ +/* We could check CRC16 here -- but ACK has already been sent anyway. If you + * need data integrity checks with this driver, check the CRC in your app + * code and report errors back to the host. Since the ACK was already sent, + * retries must be handled on application level. + * unsigned crc = usbCrc16(buffer + 1, usbRxLen - 3); + */ + usbProcessRx(usbRxBuf + USB_BUFSIZE + 1 - usbInputBufOffset, len); +#if USB_CFG_HAVE_FLOWCONTROL + if(usbRxLen > 0) /* only mark as available if not inactivated */ + usbRxLen = 0; +#else + usbRxLen = 0; /* mark rx buffer as available */ +#endif + } + if(usbTxLen & 0x10){ /* transmit system idle */ + if(usbMsgLen != USB_NO_MSG){ /* transmit data pending? */ + usbBuildTxBlock(); + } + } + for(i = 20; i > 0; i--){ + uchar usbLineStatus = USBIN & USBMASK; + if(usbLineStatus != 0) /* SE0 has ended */ + goto isNotReset; + } + /* RESET condition, called multiple times during reset */ + usbNewDeviceAddr = 0; + usbDeviceAddr = 0; + usbResetStall(); + DBG1(0xff, 0, 0); +isNotReset: + usbHandleResetHook(i); +} + +/* ------------------------------------------------------------------------- */ + +USB_PUBLIC void usbInit(void) +{ +#if USB_INTR_CFG_SET != 0 + USB_INTR_CFG |= USB_INTR_CFG_SET; +#endif +#if USB_INTR_CFG_CLR != 0 + USB_INTR_CFG &= ~(USB_INTR_CFG_CLR); +#endif + USB_INTR_ENABLE |= (1 << USB_INTR_ENABLE_BIT); + usbResetDataToggling(); +#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE + usbTxLen1 = USBPID_NAK; +#if USB_CFG_HAVE_INTRIN_ENDPOINT3 + usbTxLen3 = USBPID_NAK; +#endif +#endif +} + +/* ------------------------------------------------------------------------- */ diff --git a/usbdrv/usbdrv.h b/usbdrv/usbdrv.h new file mode 100644 index 0000000..3fe84d5 --- /dev/null +++ b/usbdrv/usbdrv.h @@ -0,0 +1,746 @@ +/* Name: usbdrv.h + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2004-12-29 + * Tabsize: 4 + * Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +#ifndef __usbdrv_h_included__ +#define __usbdrv_h_included__ +#include "usbconfig.h" +#include "usbportability.h" + +/* +Hardware Prerequisites: +======================= +USB lines D+ and D- MUST be wired to the same I/O port. We recommend that D+ +triggers the interrupt (best achieved by using INT0 for D+), but it is also +possible to trigger the interrupt from D-. If D- is used, interrupts are also +triggered by SOF packets. D- requires a pull-up of 1.5k to +3.5V (and the +device must be powered at 3.5V) to identify as low-speed USB device. A +pull-down or pull-up of 1M SHOULD be connected from D+ to +3.5V to prevent +interference when no USB master is connected. If you use Zener diodes to limit +the voltage on D+ and D-, you MUST use a pull-down resistor, not a pull-up. +We use D+ as interrupt source and not D- because it does not trigger on +keep-alive and RESET states. If you want to count keep-alive events with +USB_COUNT_SOF, you MUST use D- as an interrupt source. + +As a compile time option, the 1.5k pull-up resistor on D- can be made +switchable to allow the device to disconnect at will. See the definition of +usbDeviceConnect() and usbDeviceDisconnect() further down in this file. + +Please adapt the values in usbconfig.h according to your hardware! + +The device MUST be clocked at exactly 12 MHz, 15 MHz, 16 MHz or 20 MHz +or at 12.8 MHz resp. 16.5 MHz +/- 1%. See usbconfig-prototype.h for details. + + +Limitations: +============ +Robustness with respect to communication errors: +The driver assumes error-free communication. It DOES check for errors in +the PID, but does NOT check bit stuffing errors, SE0 in middle of a byte, +token CRC (5 bit) and data CRC (16 bit). CRC checks can not be performed due +to timing constraints: We must start sending a reply within 7 bit times. +Bit stuffing and misplaced SE0 would have to be checked in real-time, but CPU +performance does not permit that. The driver does not check Data0/Data1 +toggling, but application software can implement the check. + +Input characteristics: +Since no differential receiver circuit is used, electrical interference +robustness may suffer. The driver samples only one of the data lines with +an ordinary I/O pin's input characteristics. However, since this is only a +low speed USB implementation and the specification allows for 8 times the +bit rate over the same hardware, we should be on the safe side. Even the spec +requires detection of asymmetric states at high bit rate for SE0 detection. + +Number of endpoints: +The driver supports the following endpoints: + +- Endpoint 0, the default control endpoint. +- Any number of interrupt- or bulk-out endpoints. The data is sent to + usbFunctionWriteOut() and USB_CFG_IMPLEMENT_FN_WRITEOUT must be defined + to 1 to activate this feature. The endpoint number can be found in the + global variable 'usbRxToken'. +- One default interrupt- or bulk-in endpoint. This endpoint is used for + interrupt- or bulk-in transfers which are not handled by any other endpoint. + You must define USB_CFG_HAVE_INTRIN_ENDPOINT in order to activate this + feature and call usbSetInterrupt() to send interrupt/bulk data. +- One additional interrupt- or bulk-in endpoint. This was endpoint 3 in + previous versions of this driver but can now be configured to any endpoint + number. You must define USB_CFG_HAVE_INTRIN_ENDPOINT3 in order to activate + this feature and call usbSetInterrupt3() to send interrupt/bulk data. The + endpoint number can be set with USB_CFG_EP3_NUMBER. + +Please note that the USB standard forbids bulk endpoints for low speed devices! +Most operating systems allow them anyway, but the AVR will spend 90% of the CPU +time in the USB interrupt polling for bulk data. + +Maximum data payload: +Data payload of control in and out transfers may be up to 254 bytes. In order +to accept payload data of out transfers, you need to implement +'usbFunctionWrite()'. + +USB Suspend Mode supply current: +The USB standard limits power consumption to 500uA when the bus is in suspend +mode. This is not a problem for self-powered devices since they don't need +bus power anyway. Bus-powered devices can achieve this only by putting the +CPU in sleep mode. The driver does not implement suspend handling by itself. +However, the application may implement activity monitoring and wakeup from +sleep. The host sends regular SE0 states on the bus to keep it active. These +SE0 states can be detected by using D- as the interrupt source. Define +USB_COUNT_SOF to 1 and use the global variable usbSofCount to check for bus +activity. + +Operation without an USB master: +The driver behaves neutral without connection to an USB master if D- reads +as 1. To avoid spurious interrupts, we recommend a high impedance (e.g. 1M) +pull-down or pull-up resistor on D+ (interrupt). If Zener diodes are used, +use a pull-down. If D- becomes statically 0, the driver may block in the +interrupt routine. + +Interrupt latency: +The application must ensure that the USB interrupt is not disabled for more +than 25 cycles (this is for 12 MHz, faster clocks allow longer latency). +This implies that all interrupt routines must either have the "ISR_NOBLOCK" +attribute set (see "avr/interrupt.h") or be written in assembler with "sei" +as the first instruction. + +Maximum interrupt duration / CPU cycle consumption: +The driver handles all USB communication during the interrupt service +routine. The routine will not return before an entire USB message is received +and the reply is sent. This may be up to ca. 1200 cycles @ 12 MHz (= 100us) if +the host conforms to the standard. The driver will consume CPU cycles for all +USB messages, even if they address another (low-speed) device on the same bus. + +*/ + +/* ------------------------------------------------------------------------- */ +/* --------------------------- Module Interface ---------------------------- */ +/* ------------------------------------------------------------------------- */ + +#define USBDRV_VERSION 20121206 +/* This define uniquely identifies a driver version. It is a decimal number + * constructed from the driver's release date in the form YYYYMMDD. If the + * driver's behavior or interface changes, you can use this constant to + * distinguish versions. If it is not defined, the driver's release date is + * older than 2006-01-25. + */ + + +#ifndef USB_PUBLIC +#define USB_PUBLIC +#endif +/* USB_PUBLIC is used as declaration attribute for all functions exported by + * the USB driver. The default is no attribute (see above). You may define it + * to static either in usbconfig.h or from the command line if you include + * usbdrv.c instead of linking against it. Including the C module of the driver + * directly in your code saves a couple of bytes in flash memory. + */ + +#ifndef __ASSEMBLER__ +#ifndef uchar +#define uchar unsigned char +#endif +#ifndef schar +#define schar signed char +#endif +/* shortcuts for well defined 8 bit integer types */ + +#if USB_CFG_LONG_TRANSFERS /* if more than 254 bytes transfer size required */ +# define usbMsgLen_t unsigned +#else +# define usbMsgLen_t uchar +#endif +/* usbMsgLen_t is the data type used for transfer lengths. By default, it is + * defined to uchar, allowing a maximum of 254 bytes (255 is reserved for + * USB_NO_MSG below). If the usbconfig.h defines USB_CFG_LONG_TRANSFERS to 1, + * a 16 bit data type is used, allowing up to 16384 bytes (the rest is used + * for flags in the descriptor configuration). + */ +#define USB_NO_MSG ((usbMsgLen_t)-1) /* constant meaning "no message" */ + +#ifndef usbMsgPtr_t +#define usbMsgPtr_t uchar * +#endif +/* Making usbMsgPtr_t a define allows the user of this library to define it to + * an 8 bit type on tiny devices. This reduces code size, especially if the + * compiler supports a tiny memory model. + * The type can be a pointer or scalar type, casts are made where necessary. + * Although it's paradoxical, Gcc 4 generates slightly better code for scalar + * types than for pointers. + */ + +struct usbRequest; /* forward declaration */ + +USB_PUBLIC void usbInit(void); +/* This function must be called before interrupts are enabled and the main + * loop is entered. We exepct that the PORT and DDR bits for D+ and D- have + * not been changed from their default status (which is 0). If you have changed + * them, set both back to 0 (configure them as input with no internal pull-up). + */ +USB_PUBLIC void usbPoll(void); +/* This function must be called at regular intervals from the main loop. + * Maximum delay between calls is somewhat less than 50ms (USB timeout for + * accepting a Setup message). Otherwise the device will not be recognized. + * Please note that debug outputs through the UART take ~ 0.5ms per byte + * at 19200 bps. + */ +extern usbMsgPtr_t usbMsgPtr; +/* This variable may be used to pass transmit data to the driver from the + * implementation of usbFunctionWrite(). It is also used internally by the + * driver for standard control requests. + */ +USB_PUBLIC usbMsgLen_t usbFunctionSetup(uchar data[8]); +/* This function is called when the driver receives a SETUP transaction from + * the host which is not answered by the driver itself (in practice: class and + * vendor requests). All control transfers start with a SETUP transaction where + * the host communicates the parameters of the following (optional) data + * transfer. The SETUP data is available in the 'data' parameter which can + * (and should) be casted to 'usbRequest_t *' for a more user-friendly access + * to parameters. + * + * If the SETUP indicates a control-in transfer, you should provide the + * requested data to the driver. There are two ways to transfer this data: + * (1) Set the global pointer 'usbMsgPtr' to the base of the static RAM data + * block and return the length of the data in 'usbFunctionSetup()'. The driver + * will handle the rest. Or (2) return USB_NO_MSG in 'usbFunctionSetup()'. The + * driver will then call 'usbFunctionRead()' when data is needed. See the + * documentation for usbFunctionRead() for details. + * + * If the SETUP indicates a control-out transfer, the only way to receive the + * data from the host is through the 'usbFunctionWrite()' call. If you + * implement this function, you must return USB_NO_MSG in 'usbFunctionSetup()' + * to indicate that 'usbFunctionWrite()' should be used. See the documentation + * of this function for more information. If you just want to ignore the data + * sent by the host, return 0 in 'usbFunctionSetup()'. + * + * Note that calls to the functions usbFunctionRead() and usbFunctionWrite() + * are only done if enabled by the configuration in usbconfig.h. + */ +USB_PUBLIC usbMsgLen_t usbFunctionDescriptor(struct usbRequest *rq); +/* You need to implement this function ONLY if you provide USB descriptors at + * runtime (which is an expert feature). It is very similar to + * usbFunctionSetup() above, but it is called only to request USB descriptor + * data. See the documentation of usbFunctionSetup() above for more info. + */ +#if USB_CFG_HAVE_INTRIN_ENDPOINT +USB_PUBLIC void usbSetInterrupt(uchar *data, uchar len); +/* This function sets the message which will be sent during the next interrupt + * IN transfer. The message is copied to an internal buffer and must not exceed + * a length of 8 bytes. The message may be 0 bytes long just to indicate the + * interrupt status to the host. + * If you need to transfer more bytes, use a control read after the interrupt. + */ +#define usbInterruptIsReady() (usbTxLen1 & 0x10) +/* This macro indicates whether the last interrupt message has already been + * sent. If you set a new interrupt message before the old was sent, the + * message already buffered will be lost. + */ +#if USB_CFG_HAVE_INTRIN_ENDPOINT3 +USB_PUBLIC void usbSetInterrupt3(uchar *data, uchar len); +#define usbInterruptIsReady3() (usbTxLen3 & 0x10) +/* Same as above for endpoint 3 */ +#endif +#endif /* USB_CFG_HAVE_INTRIN_ENDPOINT */ +#if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH /* simplified interface for backward compatibility */ +#define usbHidReportDescriptor usbDescriptorHidReport +/* should be declared as: PROGMEM char usbHidReportDescriptor[]; */ +/* If you implement an HID device, you need to provide a report descriptor. + * The HID report descriptor syntax is a bit complex. If you understand how + * report descriptors are constructed, we recommend that you use the HID + * Descriptor Tool from usb.org, see http://www.usb.org/developers/hidpage/. + * Otherwise you should probably start with a working example. + */ +#endif /* USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH */ +#if USB_CFG_IMPLEMENT_FN_WRITE +USB_PUBLIC uchar usbFunctionWrite(uchar *data, uchar len); +/* This function is called by the driver to provide a control transfer's + * payload data (control-out). It is called in chunks of up to 8 bytes. The + * total count provided in the current control transfer can be obtained from + * the 'length' property in the setup data. If an error occurred during + * processing, return 0xff (== -1). The driver will answer the entire transfer + * with a STALL token in this case. If you have received the entire payload + * successfully, return 1. If you expect more data, return 0. If you don't + * know whether the host will send more data (you should know, the total is + * provided in the usbFunctionSetup() call!), return 1. + * NOTE: If you return 0xff for STALL, 'usbFunctionWrite()' may still be called + * for the remaining data. You must continue to return 0xff for STALL in these + * calls. + * In order to get usbFunctionWrite() called, define USB_CFG_IMPLEMENT_FN_WRITE + * to 1 in usbconfig.h and return 0xff in usbFunctionSetup().. + */ +#endif /* USB_CFG_IMPLEMENT_FN_WRITE */ +#if USB_CFG_IMPLEMENT_FN_READ +USB_PUBLIC uchar usbFunctionRead(uchar *data, uchar len); +/* This function is called by the driver to ask the application for a control + * transfer's payload data (control-in). It is called in chunks of up to 8 + * bytes each. You should copy the data to the location given by 'data' and + * return the actual number of bytes copied. If you return less than requested, + * the control-in transfer is terminated. If you return 0xff, the driver aborts + * the transfer with a STALL token. + * In order to get usbFunctionRead() called, define USB_CFG_IMPLEMENT_FN_READ + * to 1 in usbconfig.h and return 0xff in usbFunctionSetup().. + */ +#endif /* USB_CFG_IMPLEMENT_FN_READ */ + +extern uchar usbRxToken; /* may be used in usbFunctionWriteOut() below */ +#if USB_CFG_IMPLEMENT_FN_WRITEOUT +USB_PUBLIC void usbFunctionWriteOut(uchar *data, uchar len); +/* This function is called by the driver when data is received on an interrupt- + * or bulk-out endpoint. The endpoint number can be found in the global + * variable usbRxToken. You must define USB_CFG_IMPLEMENT_FN_WRITEOUT to 1 in + * usbconfig.h to get this function called. + */ +#endif /* USB_CFG_IMPLEMENT_FN_WRITEOUT */ +#ifdef USB_CFG_PULLUP_IOPORTNAME +#define usbDeviceConnect() ((USB_PULLUP_DDR |= (1<<USB_CFG_PULLUP_BIT)), \ + (USB_PULLUP_OUT |= (1<<USB_CFG_PULLUP_BIT))) +#define usbDeviceDisconnect() ((USB_PULLUP_DDR &= ~(1<<USB_CFG_PULLUP_BIT)), \ + (USB_PULLUP_OUT &= ~(1<<USB_CFG_PULLUP_BIT))) +#else /* USB_CFG_PULLUP_IOPORTNAME */ +#define usbDeviceConnect() (USBDDR &= ~(1<<USBMINUS)) +#define usbDeviceDisconnect() (USBDDR |= (1<<USBMINUS)) +#endif /* USB_CFG_PULLUP_IOPORTNAME */ +/* The macros usbDeviceConnect() and usbDeviceDisconnect() (intended to look + * like a function) connect resp. disconnect the device from the host's USB. + * If the constants USB_CFG_PULLUP_IOPORT and USB_CFG_PULLUP_BIT are defined + * in usbconfig.h, a disconnect consists of removing the pull-up resisitor + * from D-, otherwise the disconnect is done by brute-force pulling D- to GND. + * This does not conform to the spec, but it works. + * Please note that the USB interrupt must be disabled while the device is + * in disconnected state, or the interrupt handler will hang! You can either + * turn off the USB interrupt selectively with + * USB_INTR_ENABLE &= ~(1 << USB_INTR_ENABLE_BIT) + * or use cli() to disable interrupts globally. + */ +extern unsigned usbCrc16(unsigned data, uchar len); +#define usbCrc16(data, len) usbCrc16((unsigned)(data), len) +/* This function calculates the binary complement of the data CRC used in + * USB data packets. The value is used to build raw transmit packets. + * You may want to use this function for data checksums or to verify received + * data. We enforce 16 bit calling conventions for compatibility with IAR's + * tiny memory model. + */ +extern unsigned usbCrc16Append(unsigned data, uchar len); +#define usbCrc16Append(data, len) usbCrc16Append((unsigned)(data), len) +/* This function is equivalent to usbCrc16() above, except that it appends + * the 2 bytes CRC (lowbyte first) in the 'data' buffer after reading 'len' + * bytes. + */ +#if USB_CFG_HAVE_MEASURE_FRAME_LENGTH +extern unsigned usbMeasureFrameLength(void); +/* This function MUST be called IMMEDIATELY AFTER USB reset and measures 1/7 of + * the number of CPU cycles during one USB frame minus one low speed bit + * length. In other words: return value = 1499 * (F_CPU / 10.5 MHz) + * Since this is a busy wait, you MUST disable all interrupts with cli() before + * calling this function. + * This can be used to calibrate the AVR's RC oscillator. + */ +#endif +extern uchar usbConfiguration; +/* This value contains the current configuration set by the host. The driver + * allows setting and querying of this variable with the USB SET_CONFIGURATION + * and GET_CONFIGURATION requests, but does not use it otherwise. + * You may want to reflect the "configured" status with a LED on the device or + * switch on high power parts of the circuit only if the device is configured. + */ +#if USB_COUNT_SOF +extern volatile uchar usbSofCount; +/* This variable is incremented on every SOF packet. It is only available if + * the macro USB_COUNT_SOF is defined to a value != 0. + */ +#endif +#if USB_CFG_CHECK_DATA_TOGGLING +extern uchar usbCurrentDataToken; +/* This variable can be checked in usbFunctionWrite() and usbFunctionWriteOut() + * to ignore duplicate packets. + */ +#endif + +#define USB_STRING_DESCRIPTOR_HEADER(stringLength) ((2*(stringLength)+2) | (3<<8)) +/* This macro builds a descriptor header for a string descriptor given the + * string's length. See usbdrv.c for an example how to use it. + */ +#if USB_CFG_HAVE_FLOWCONTROL +extern volatile schar usbRxLen; +#define usbDisableAllRequests() usbRxLen = -1 +/* Must be called from usbFunctionWrite(). This macro disables all data input + * from the USB interface. Requests from the host are answered with a NAK + * while they are disabled. + */ +#define usbEnableAllRequests() usbRxLen = 0 +/* May only be called if requests are disabled. This macro enables input from + * the USB interface after it has been disabled with usbDisableAllRequests(). + */ +#define usbAllRequestsAreDisabled() (usbRxLen < 0) +/* Use this macro to find out whether requests are disabled. It may be needed + * to ensure that usbEnableAllRequests() is never called when requests are + * enabled. + */ +#endif + +#define USB_SET_DATATOKEN1(token) usbTxBuf1[0] = token +#define USB_SET_DATATOKEN3(token) usbTxBuf3[0] = token +/* These two macros can be used by application software to reset data toggling + * for interrupt-in endpoints 1 and 3. Since the token is toggled BEFORE + * sending data, you must set the opposite value of the token which should come + * first. + */ + +#endif /* __ASSEMBLER__ */ + + +/* ------------------------------------------------------------------------- */ +/* ----------------- Definitions for Descriptor Properties ----------------- */ +/* ------------------------------------------------------------------------- */ +/* This is advanced stuff. See usbconfig-prototype.h for more information + * about the various methods to define USB descriptors. If you do nothing, + * the default descriptors will be used. + */ +#define USB_PROP_IS_DYNAMIC (1u << 14) +/* If this property is set for a descriptor, usbFunctionDescriptor() will be + * used to obtain the particular descriptor. Data directly returned via + * usbMsgPtr are FLASH data by default, combine (OR) with USB_PROP_IS_RAM to + * return RAM data. + */ +#define USB_PROP_IS_RAM (1u << 15) +/* If this property is set for a descriptor, the data is read from RAM + * memory instead of Flash. The property is used for all methods to provide + * external descriptors. + */ +#define USB_PROP_LENGTH(len) ((len) & 0x3fff) +/* If a static external descriptor is used, this is the total length of the + * descriptor in bytes. + */ + +/* all descriptors which may have properties: */ +#ifndef USB_CFG_DESCR_PROPS_DEVICE +#define USB_CFG_DESCR_PROPS_DEVICE 0 +#endif +#ifndef USB_CFG_DESCR_PROPS_CONFIGURATION +#define USB_CFG_DESCR_PROPS_CONFIGURATION 0 +#endif +#ifndef USB_CFG_DESCR_PROPS_STRINGS +#define USB_CFG_DESCR_PROPS_STRINGS 0 +#endif +#ifndef USB_CFG_DESCR_PROPS_STRING_0 +#define USB_CFG_DESCR_PROPS_STRING_0 0 +#endif +#ifndef USB_CFG_DESCR_PROPS_STRING_VENDOR +#define USB_CFG_DESCR_PROPS_STRING_VENDOR 0 +#endif +#ifndef USB_CFG_DESCR_PROPS_STRING_PRODUCT +#define USB_CFG_DESCR_PROPS_STRING_PRODUCT 0 +#endif +#ifndef USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER +#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER 0 +#endif +#ifndef USB_CFG_DESCR_PROPS_HID +#define USB_CFG_DESCR_PROPS_HID 0 +#endif +#if !(USB_CFG_DESCR_PROPS_HID_REPORT) +# undef USB_CFG_DESCR_PROPS_HID_REPORT +# if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH /* do some backward compatibility tricks */ +# define USB_CFG_DESCR_PROPS_HID_REPORT USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH +# else +# define USB_CFG_DESCR_PROPS_HID_REPORT 0 +# endif +#endif +#ifndef USB_CFG_DESCR_PROPS_UNKNOWN +#define USB_CFG_DESCR_PROPS_UNKNOWN 0 +#endif + +/* ------------------ forward declaration of descriptors ------------------- */ +/* If you use external static descriptors, they must be stored in global + * arrays as declared below: + */ +#ifndef __ASSEMBLER__ +extern +#if !(USB_CFG_DESCR_PROPS_DEVICE & USB_PROP_IS_RAM) +PROGMEM const +#endif +char usbDescriptorDevice[]; + +extern +#if !(USB_CFG_DESCR_PROPS_CONFIGURATION & USB_PROP_IS_RAM) +PROGMEM const +#endif +char usbDescriptorConfiguration[]; + +extern +#if !(USB_CFG_DESCR_PROPS_HID_REPORT & USB_PROP_IS_RAM) +PROGMEM const +#endif +char usbDescriptorHidReport[]; + +extern +#if !(USB_CFG_DESCR_PROPS_STRING_0 & USB_PROP_IS_RAM) +PROGMEM const +#endif +char usbDescriptorString0[]; + +extern +#if !(USB_CFG_DESCR_PROPS_STRING_VENDOR & USB_PROP_IS_RAM) +PROGMEM const +#endif +int usbDescriptorStringVendor[]; + +extern +#if !(USB_CFG_DESCR_PROPS_STRING_PRODUCT & USB_PROP_IS_RAM) +PROGMEM const +#endif +int usbDescriptorStringDevice[]; + +extern +#if !(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER & USB_PROP_IS_RAM) +PROGMEM const +#endif +int usbDescriptorStringSerialNumber[]; + +#endif /* __ASSEMBLER__ */ + +/* ------------------------------------------------------------------------- */ +/* ------------------------ General Purpose Macros ------------------------- */ +/* ------------------------------------------------------------------------- */ + +#define USB_CONCAT(a, b) a ## b +#define USB_CONCAT_EXPANDED(a, b) USB_CONCAT(a, b) + +#define USB_OUTPORT(name) USB_CONCAT(PORT, name) +#define USB_INPORT(name) USB_CONCAT(PIN, name) +#define USB_DDRPORT(name) USB_CONCAT(DDR, name) +/* The double-define trick above lets us concatenate strings which are + * defined by macros. + */ + +/* ------------------------------------------------------------------------- */ +/* ------------------------- Constant definitions -------------------------- */ +/* ------------------------------------------------------------------------- */ + +#if !defined __ASSEMBLER__ && (!defined USB_CFG_VENDOR_ID || !defined USB_CFG_DEVICE_ID) +#warning "You should define USB_CFG_VENDOR_ID and USB_CFG_DEVICE_ID in usbconfig.h" +/* If the user has not defined IDs, we default to obdev's free IDs. + * See USB-IDs-for-free.txt for details. + */ +#endif + +/* make sure we have a VID and PID defined, byte order is lowbyte, highbyte */ +#ifndef USB_CFG_VENDOR_ID +# define USB_CFG_VENDOR_ID 0xc0, 0x16 /* = 0x16c0 = 5824 = voti.nl */ +#endif + +#ifndef USB_CFG_DEVICE_ID +# if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH +# define USB_CFG_DEVICE_ID 0xdf, 0x05 /* = 0x5df = 1503, shared PID for HIDs */ +# elif USB_CFG_INTERFACE_CLASS == 2 +# define USB_CFG_DEVICE_ID 0xe1, 0x05 /* = 0x5e1 = 1505, shared PID for CDC Modems */ +# else +# define USB_CFG_DEVICE_ID 0xdc, 0x05 /* = 0x5dc = 1500, obdev's free PID */ +# endif +#endif + +/* Derive Output, Input and DataDirection ports from port names */ +#ifndef USB_CFG_IOPORTNAME +#error "You must define USB_CFG_IOPORTNAME in usbconfig.h, see usbconfig-prototype.h" +#endif + +#define USBOUT USB_OUTPORT(USB_CFG_IOPORTNAME) +#define USB_PULLUP_OUT USB_OUTPORT(USB_CFG_PULLUP_IOPORTNAME) +#define USBIN USB_INPORT(USB_CFG_IOPORTNAME) +#define USBDDR USB_DDRPORT(USB_CFG_IOPORTNAME) +#define USB_PULLUP_DDR USB_DDRPORT(USB_CFG_PULLUP_IOPORTNAME) + +#define USBMINUS USB_CFG_DMINUS_BIT +#define USBPLUS USB_CFG_DPLUS_BIT +#define USBIDLE (1<<USB_CFG_DMINUS_BIT) /* value representing J state */ +#define USBMASK ((1<<USB_CFG_DPLUS_BIT) | (1<<USB_CFG_DMINUS_BIT)) /* mask for USB I/O bits */ + +/* defines for backward compatibility with older driver versions: */ +#define USB_CFG_IOPORT USB_OUTPORT(USB_CFG_IOPORTNAME) +#ifdef USB_CFG_PULLUP_IOPORTNAME +#define USB_CFG_PULLUP_IOPORT USB_OUTPORT(USB_CFG_PULLUP_IOPORTNAME) +#endif + +#ifndef USB_CFG_EP3_NUMBER /* if not defined in usbconfig.h */ +#define USB_CFG_EP3_NUMBER 3 +#endif + +#ifndef USB_CFG_HAVE_INTRIN_ENDPOINT3 +#define USB_CFG_HAVE_INTRIN_ENDPOINT3 0 +#endif + +#define USB_BUFSIZE 11 /* PID, 8 bytes data, 2 bytes CRC */ + +/* ----- Try to find registers and bits responsible for ext interrupt 0 ----- */ + +#ifndef USB_INTR_CFG /* allow user to override our default */ +# if defined EICRA +# define USB_INTR_CFG EICRA +# else +# define USB_INTR_CFG MCUCR +# endif +#endif +#ifndef USB_INTR_CFG_SET /* allow user to override our default */ +# if defined(USB_COUNT_SOF) || defined(USB_SOF_HOOK) +# define USB_INTR_CFG_SET (1 << ISC01) /* cfg for falling edge */ + /* If any SOF logic is used, the interrupt must be wired to D- where + * we better trigger on falling edge + */ +# else +# define USB_INTR_CFG_SET ((1 << ISC00) | (1 << ISC01)) /* cfg for rising edge */ +# endif +#endif +#ifndef USB_INTR_CFG_CLR /* allow user to override our default */ +# define USB_INTR_CFG_CLR 0 /* no bits to clear */ +#endif + +#ifndef USB_INTR_ENABLE /* allow user to override our default */ +# if defined GIMSK +# define USB_INTR_ENABLE GIMSK +# elif defined EIMSK +# define USB_INTR_ENABLE EIMSK +# else +# define USB_INTR_ENABLE GICR +# endif +#endif +#ifndef USB_INTR_ENABLE_BIT /* allow user to override our default */ +# define USB_INTR_ENABLE_BIT INT0 +#endif + +#ifndef USB_INTR_PENDING /* allow user to override our default */ +# if defined EIFR +# define USB_INTR_PENDING EIFR +# else +# define USB_INTR_PENDING GIFR +# endif +#endif +#ifndef USB_INTR_PENDING_BIT /* allow user to override our default */ +# define USB_INTR_PENDING_BIT INTF0 +#endif + +/* +The defines above don't work for the following chips +at90c8534: no ISC0?, no PORTB, can't find a data sheet +at86rf401: no PORTB, no MCUCR etc, low clock rate +atmega103: no ISC0? (maybe omission in header, can't find data sheet) +atmega603: not defined in avr-libc +at43usb320, at43usb355, at76c711: have USB anyway +at94k: is different... + +at90s1200, attiny11, attiny12, attiny15, attiny28: these have no RAM +*/ + +/* ------------------------------------------------------------------------- */ +/* ----------------- USB Specification Constants and Types ----------------- */ +/* ------------------------------------------------------------------------- */ + +/* USB Token values */ +#define USBPID_SETUP 0x2d +#define USBPID_OUT 0xe1 +#define USBPID_IN 0x69 +#define USBPID_DATA0 0xc3 +#define USBPID_DATA1 0x4b + +#define USBPID_ACK 0xd2 +#define USBPID_NAK 0x5a +#define USBPID_STALL 0x1e + +#ifndef USB_INITIAL_DATATOKEN +#define USB_INITIAL_DATATOKEN USBPID_DATA1 +#endif + +#ifndef __ASSEMBLER__ + +typedef struct usbTxStatus{ + volatile uchar len; + uchar buffer[USB_BUFSIZE]; +}usbTxStatus_t; + +extern usbTxStatus_t usbTxStatus1, usbTxStatus3; +#define usbTxLen1 usbTxStatus1.len +#define usbTxBuf1 usbTxStatus1.buffer +#define usbTxLen3 usbTxStatus3.len +#define usbTxBuf3 usbTxStatus3.buffer + + +typedef union usbWord{ + unsigned word; + uchar bytes[2]; +}usbWord_t; + +typedef struct usbRequest{ + uchar bmRequestType; + uchar bRequest; + usbWord_t wValue; + usbWord_t wIndex; + usbWord_t wLength; +}usbRequest_t; +/* This structure matches the 8 byte setup request */ +#endif + +/* bmRequestType field in USB setup: + * d t t r r r r r, where + * d ..... direction: 0=host->device, 1=device->host + * t ..... type: 0=standard, 1=class, 2=vendor, 3=reserved + * r ..... recipient: 0=device, 1=interface, 2=endpoint, 3=other + */ + +/* USB setup recipient values */ +#define USBRQ_RCPT_MASK 0x1f +#define USBRQ_RCPT_DEVICE 0 +#define USBRQ_RCPT_INTERFACE 1 +#define USBRQ_RCPT_ENDPOINT 2 + +/* USB request type values */ +#define USBRQ_TYPE_MASK 0x60 +#define USBRQ_TYPE_STANDARD (0<<5) +#define USBRQ_TYPE_CLASS (1<<5) +#define USBRQ_TYPE_VENDOR (2<<5) + +/* USB direction values: */ +#define USBRQ_DIR_MASK 0x80 +#define USBRQ_DIR_HOST_TO_DEVICE (0<<7) +#define USBRQ_DIR_DEVICE_TO_HOST (1<<7) + +/* USB Standard Requests */ +#define USBRQ_GET_STATUS 0 +#define USBRQ_CLEAR_FEATURE 1 +#define USBRQ_SET_FEATURE 3 +#define USBRQ_SET_ADDRESS 5 +#define USBRQ_GET_DESCRIPTOR 6 +#define USBRQ_SET_DESCRIPTOR 7 +#define USBRQ_GET_CONFIGURATION 8 +#define USBRQ_SET_CONFIGURATION 9 +#define USBRQ_GET_INTERFACE 10 +#define USBRQ_SET_INTERFACE 11 +#define USBRQ_SYNCH_FRAME 12 + +/* USB descriptor constants */ +#define USBDESCR_DEVICE 1 +#define USBDESCR_CONFIG 2 +#define USBDESCR_STRING 3 +#define USBDESCR_INTERFACE 4 +#define USBDESCR_ENDPOINT 5 +#define USBDESCR_HID 0x21 +#define USBDESCR_HID_REPORT 0x22 +#define USBDESCR_HID_PHYS 0x23 + +//#define USBATTR_BUSPOWER 0x80 // USB 1.1 does not define this value any more +#define USBATTR_BUSPOWER 0 +#define USBATTR_SELFPOWER 0x40 +#define USBATTR_REMOTEWAKE 0x20 + +/* USB HID Requests */ +#define USBRQ_HID_GET_REPORT 0x01 +#define USBRQ_HID_GET_IDLE 0x02 +#define USBRQ_HID_GET_PROTOCOL 0x03 +#define USBRQ_HID_SET_REPORT 0x09 +#define USBRQ_HID_SET_IDLE 0x0a +#define USBRQ_HID_SET_PROTOCOL 0x0b + +/* ------------------------------------------------------------------------- */ + +#endif /* __usbdrv_h_included__ */ diff --git a/usbdrv/usbdrvasm.S b/usbdrv/usbdrvasm.S new file mode 100644 index 0000000..32ce8ef --- /dev/null +++ b/usbdrv/usbdrvasm.S @@ -0,0 +1,392 @@ +/* Name: usbdrvasm.S + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2007-06-13 + * Tabsize: 4 + * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* +General Description: +This module is the assembler part of the USB driver. This file contains +general code (preprocessor acrobatics and CRC computation) and then includes +the file appropriate for the given clock rate. +*/ + +#define __SFR_OFFSET 0 /* used by avr-libc's register definitions */ +#include "usbportability.h" +#include "usbdrv.h" /* for common defs */ + +/* register names */ +#define x1 r16 +#define x2 r17 +#define shift r18 +#define cnt r19 +#define x3 r20 +#define x4 r21 +#define x5 r22 +#define bitcnt x5 +#define phase x4 +#define leap x4 + +/* Some assembler dependent definitions and declarations: */ + +#ifdef __IAR_SYSTEMS_ASM__ + extern usbRxBuf, usbDeviceAddr, usbNewDeviceAddr, usbInputBufOffset + extern usbCurrentTok, usbRxLen, usbRxToken, usbTxLen + extern usbTxBuf, usbTxStatus1, usbTxStatus3 +# if USB_COUNT_SOF + extern usbSofCount +# endif + public usbCrc16 + public usbCrc16Append + + COMMON INTVEC +# ifndef USB_INTR_VECTOR + ORG INT0_vect +# else /* USB_INTR_VECTOR */ + ORG USB_INTR_VECTOR +# undef USB_INTR_VECTOR +# endif /* USB_INTR_VECTOR */ +# define USB_INTR_VECTOR usbInterruptHandler + rjmp USB_INTR_VECTOR + RSEG CODE + +#else /* __IAR_SYSTEMS_ASM__ */ + +# ifndef USB_INTR_VECTOR /* default to hardware interrupt INT0 */ +# ifdef INT0_vect +# define USB_INTR_VECTOR INT0_vect // this is the "new" define for the vector +# else +# define USB_INTR_VECTOR SIG_INTERRUPT0 // this is the "old" vector +# endif +# endif + .text + .global USB_INTR_VECTOR + .type USB_INTR_VECTOR, @function + .global usbCrc16 + .global usbCrc16Append +#endif /* __IAR_SYSTEMS_ASM__ */ + + +#if USB_INTR_PENDING < 0x40 /* This is an I/O address, use in and out */ +# define USB_LOAD_PENDING(reg) in reg, USB_INTR_PENDING +# define USB_STORE_PENDING(reg) out USB_INTR_PENDING, reg +#else /* It's a memory address, use lds and sts */ +# define USB_LOAD_PENDING(reg) lds reg, USB_INTR_PENDING +# define USB_STORE_PENDING(reg) sts USB_INTR_PENDING, reg +#endif + +#define usbTxLen1 usbTxStatus1 +#define usbTxBuf1 (usbTxStatus1 + 1) +#define usbTxLen3 usbTxStatus3 +#define usbTxBuf3 (usbTxStatus3 + 1) + + +;---------------------------------------------------------------------------- +; Utility functions +;---------------------------------------------------------------------------- + +#ifdef __IAR_SYSTEMS_ASM__ +/* Register assignments for usbCrc16 on IAR cc */ +/* Calling conventions on IAR: + * First parameter passed in r16/r17, second in r18/r19 and so on. + * Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer) + * Result is passed in r16/r17 + * In case of the "tiny" memory model, pointers are only 8 bit with no + * padding. We therefore pass argument 1 as "16 bit unsigned". + */ +RTMODEL "__rt_version", "3" +/* The line above will generate an error if cc calling conventions change. + * The value "3" above is valid for IAR 4.10B/W32 + */ +# define argLen r18 /* argument 2 */ +# define argPtrL r16 /* argument 1 */ +# define argPtrH r17 /* argument 1 */ + +# define resCrcL r16 /* result */ +# define resCrcH r17 /* result */ + +# define ptrL ZL +# define ptrH ZH +# define ptr Z +# define byte r22 +# define bitCnt r19 +# define polyL r20 +# define polyH r21 +# define scratch r23 + +#else /* __IAR_SYSTEMS_ASM__ */ +/* Register assignments for usbCrc16 on gcc */ +/* Calling conventions on gcc: + * First parameter passed in r24/r25, second in r22/23 and so on. + * Callee must preserve r1-r17, r28/r29 + * Result is passed in r24/r25 + */ +# define argLen r22 /* argument 2 */ +# define argPtrL r24 /* argument 1 */ +# define argPtrH r25 /* argument 1 */ + +# define resCrcL r24 /* result */ +# define resCrcH r25 /* result */ + +# define ptrL XL +# define ptrH XH +# define ptr x +# define byte r18 +# define bitCnt r19 +# define polyL r20 +# define polyH r21 +# define scratch r23 + +#endif + +#if USB_USE_FAST_CRC + +; This implementation is faster, but has bigger code size +; Thanks to Slawomir Fras (BoskiDialer) for this code! +; It implements the following C pseudo-code: +; unsigned table(unsigned char x) +; { +; unsigned value; +; +; value = (unsigned)x << 6; +; value ^= (unsigned)x << 7; +; if(parity(x)) +; value ^= 0xc001; +; return value; +; } +; unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen) +; { +; unsigned crc = 0xffff; +; +; while(argLen--) +; crc = table(lo8(crc) ^ *argPtr++) ^ hi8(crc); +; return ~crc; +; } + +; extern unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen); +; argPtr r24+25 / r16+r17 +; argLen r22 / r18 +; temp variables: +; byte r18 / r22 +; scratch r23 +; resCrc r24+r25 / r16+r17 +; ptr X / Z +usbCrc16: + mov ptrL, argPtrL + mov ptrH, argPtrH + ldi resCrcL, 0xFF + ldi resCrcH, 0xFF + rjmp usbCrc16LoopTest +usbCrc16ByteLoop: + ld byte, ptr+ + eor resCrcL, byte ; resCrcL is now 'x' in table() + mov byte, resCrcL ; compute parity of 'x' + swap byte + eor byte, resCrcL + mov scratch, byte + lsr byte + lsr byte + eor byte, scratch + inc byte + lsr byte + andi byte, 1 ; byte is now parity(x) + mov scratch, resCrcL + mov resCrcL, resCrcH + eor resCrcL, byte ; low byte of if(parity(x)) value ^= 0xc001; + neg byte + andi byte, 0xc0 + mov resCrcH, byte ; high byte of if(parity(x)) value ^= 0xc001; + clr byte + lsr scratch + ror byte + eor resCrcH, scratch + eor resCrcL, byte + lsr scratch + ror byte + eor resCrcH, scratch + eor resCrcL, byte +usbCrc16LoopTest: + subi argLen, 1 + brsh usbCrc16ByteLoop + com resCrcL + com resCrcH + ret + +#else /* USB_USE_FAST_CRC */ + +; This implementation is slower, but has less code size +; +; extern unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen); +; argPtr r24+25 / r16+r17 +; argLen r22 / r18 +; temp variables: +; byte r18 / r22 +; bitCnt r19 +; poly r20+r21 +; scratch r23 +; resCrc r24+r25 / r16+r17 +; ptr X / Z +usbCrc16: + mov ptrL, argPtrL + mov ptrH, argPtrH + ldi resCrcL, 0 + ldi resCrcH, 0 + ldi polyL, lo8(0xa001) + ldi polyH, hi8(0xa001) + com argLen ; argLen = -argLen - 1: modified loop to ensure that carry is set + ldi bitCnt, 0 ; loop counter with starnd condition = end condition + rjmp usbCrcLoopEntry +usbCrcByteLoop: + ld byte, ptr+ + eor resCrcL, byte +usbCrcBitLoop: + ror resCrcH ; carry is always set here (see brcs jumps to here) + ror resCrcL + brcs usbCrcNoXor + eor resCrcL, polyL + eor resCrcH, polyH +usbCrcNoXor: + subi bitCnt, 224 ; (8 * 224) % 256 = 0; this loop iterates 8 times + brcs usbCrcBitLoop +usbCrcLoopEntry: + subi argLen, -1 + brcs usbCrcByteLoop +usbCrcReady: + ret +; Thanks to Reimar Doeffinger for optimizing this CRC routine! + +#endif /* USB_USE_FAST_CRC */ + +; extern unsigned usbCrc16Append(unsigned char *data, unsigned char len); +usbCrc16Append: + rcall usbCrc16 + st ptr+, resCrcL + st ptr+, resCrcH + ret + +#undef argLen +#undef argPtrL +#undef argPtrH +#undef resCrcL +#undef resCrcH +#undef ptrL +#undef ptrH +#undef ptr +#undef byte +#undef bitCnt +#undef polyL +#undef polyH +#undef scratch + + +#if USB_CFG_HAVE_MEASURE_FRAME_LENGTH +#ifdef __IAR_SYSTEMS_ASM__ +/* Register assignments for usbMeasureFrameLength on IAR cc */ +/* Calling conventions on IAR: + * First parameter passed in r16/r17, second in r18/r19 and so on. + * Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer) + * Result is passed in r16/r17 + * In case of the "tiny" memory model, pointers are only 8 bit with no + * padding. We therefore pass argument 1 as "16 bit unsigned". + */ +# define resL r16 +# define resH r17 +# define cnt16L r30 +# define cnt16H r31 +# define cntH r18 + +#else /* __IAR_SYSTEMS_ASM__ */ +/* Register assignments for usbMeasureFrameLength on gcc */ +/* Calling conventions on gcc: + * First parameter passed in r24/r25, second in r22/23 and so on. + * Callee must preserve r1-r17, r28/r29 + * Result is passed in r24/r25 + */ +# define resL r24 +# define resH r25 +# define cnt16L r24 +# define cnt16H r25 +# define cntH r26 +#endif +# define cnt16 cnt16L + +; extern unsigned usbMeasurePacketLength(void); +; returns time between two idle strobes in multiples of 7 CPU clocks +.global usbMeasureFrameLength +usbMeasureFrameLength: + ldi cntH, 6 ; wait ~ 10 ms for D- == 0 + clr cnt16L + clr cnt16H +usbMFTime16: + dec cntH + breq usbMFTimeout +usbMFWaitStrobe: ; first wait for D- == 0 (idle strobe) + sbiw cnt16, 1 ;[0] [6] + breq usbMFTime16 ;[2] + sbic USBIN, USBMINUS ;[3] + rjmp usbMFWaitStrobe ;[4] +usbMFWaitIdle: ; then wait until idle again + sbis USBIN, USBMINUS ;1 wait for D- == 1 + rjmp usbMFWaitIdle ;2 + ldi cnt16L, 1 ;1 represents cycles so far + clr cnt16H ;1 +usbMFWaitLoop: + in cntH, USBIN ;[0] [7] + adiw cnt16, 1 ;[1] + breq usbMFTimeout ;[3] + andi cntH, USBMASK ;[4] + brne usbMFWaitLoop ;[5] +usbMFTimeout: +#if resL != cnt16L + mov resL, cnt16L + mov resH, cnt16H +#endif + ret + +#undef resL +#undef resH +#undef cnt16 +#undef cnt16L +#undef cnt16H +#undef cntH + +#endif /* USB_CFG_HAVE_MEASURE_FRAME_LENGTH */ + +;---------------------------------------------------------------------------- +; Now include the clock rate specific code +;---------------------------------------------------------------------------- + +#ifndef USB_CFG_CLOCK_KHZ +# ifdef F_CPU +# define USB_CFG_CLOCK_KHZ (F_CPU/1000) +# else +# error "USB_CFG_CLOCK_KHZ not defined in usbconfig.h and no F_CPU set!" +# endif +#endif + +#if USB_CFG_CHECK_CRC /* separate dispatcher for CRC type modules */ +# if USB_CFG_CLOCK_KHZ == 18000 +# include "usbdrvasm18-crc.inc" +# else +# error "USB_CFG_CLOCK_KHZ is not one of the supported crc-rates!" +# endif +#else /* USB_CFG_CHECK_CRC */ +# if USB_CFG_CLOCK_KHZ == 12000 +# include "usbdrvasm12.inc" +# elif USB_CFG_CLOCK_KHZ == 12800 +# include "usbdrvasm128.inc" +# elif USB_CFG_CLOCK_KHZ == 15000 +# include "usbdrvasm15.inc" +# elif USB_CFG_CLOCK_KHZ == 16000 +# include "usbdrvasm16.inc" +# elif USB_CFG_CLOCK_KHZ == 16500 +# include "usbdrvasm165.inc" +# elif USB_CFG_CLOCK_KHZ == 20000 +# include "usbdrvasm20.inc" +# else +# error "USB_CFG_CLOCK_KHZ is not one of the supported non-crc-rates!" +# endif +#endif /* USB_CFG_CHECK_CRC */ diff --git a/usbdrv/usbdrvasm.asm b/usbdrv/usbdrvasm.asm new file mode 100644 index 0000000..fb66934 --- /dev/null +++ b/usbdrv/usbdrvasm.asm @@ -0,0 +1,20 @@ +/* Name: usbdrvasm.asm + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2006-03-01 + * Tabsize: 4 + * Copyright: (c) 2006 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* +General Description: +The IAR compiler/assembler system prefers assembler files with file extension +".asm". We simply provide this file as an alias for usbdrvasm.S. + +Thanks to Oleg Semyonov for his help with the IAR tools port! +*/ + +#include "usbdrvasm.S" + +end diff --git a/usbdrv/usbdrvasm12.inc b/usbdrv/usbdrvasm12.inc new file mode 100644 index 0000000..d3bd056 --- /dev/null +++ b/usbdrv/usbdrvasm12.inc @@ -0,0 +1,392 @@ +/* Name: usbdrvasm12.inc + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2004-12-29 + * Tabsize: 4 + * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* Do not link this file! Link usbdrvasm.S instead, which includes the + * appropriate implementation! + */ + +/* +General Description: +This file is the 12 MHz version of the asssembler part of the USB driver. It +requires a 12 MHz crystal (not a ceramic resonator and not a calibrated RC +oscillator). + +See usbdrv.h for a description of the entire driver. + +Since almost all of this code is timing critical, don't change unless you +really know what you are doing! Many parts require not only a maximum number +of CPU cycles, but even an exact number of cycles! + + +Timing constraints according to spec (in bit times): +timing subject min max CPUcycles +--------------------------------------------------------------------------- +EOP of OUT/SETUP to sync pattern of DATA0 (both rx) 2 16 16-128 +EOP of IN to sync pattern of DATA0 (rx, then tx) 2 7.5 16-60 +DATAx (rx) to ACK/NAK/STALL (tx) 2 7.5 16-60 +*/ + +;Software-receiver engine. Strict timing! Don't change unless you can preserve timing! +;interrupt response time: 4 cycles + insn running = 7 max if interrupts always enabled +;max allowable interrupt latency: 34 cycles -> max 25 cycles interrupt disable +;max stack usage: [ret(2), YL, SREG, YH, shift, x1, x2, x3, cnt, x4] = 11 bytes +;Numbers in brackets are maximum cycles since SOF. +USB_INTR_VECTOR: +;order of registers pushed: YL, SREG [sofError], YH, shift, x1, x2, x3, cnt + push YL ;2 [35] push only what is necessary to sync with edge ASAP + in YL, SREG ;1 [37] + push YL ;2 [39] +;---------------------------------------------------------------------------- +; Synchronize with sync pattern: +;---------------------------------------------------------------------------- +;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K] +;sync up with J to K edge during sync pattern -- use fastest possible loops +;The first part waits at most 1 bit long since we must be in sync pattern. +;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to +;waitForJ, ensure that this prerequisite is met. +waitForJ: + inc YL + sbis USBIN, USBMINUS + brne waitForJ ; just make sure we have ANY timeout +waitForK: +;The following code results in a sampling window of 1/4 bit which meets the spec. + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK +#if USB_COUNT_SOF + lds YL, usbSofCount + inc YL + sts usbSofCount, YL +#endif /* USB_COUNT_SOF */ +#ifdef USB_SOF_HOOK + USB_SOF_HOOK +#endif + rjmp sofError +foundK: +;{3, 5} after falling D- edge, average delay: 4 cycles [we want 4 for center sampling] +;we have 1 bit time for setup purposes, then sample again. Numbers in brackets +;are cycles from center of first sync (double K) bit after the instruction + push YH ;2 [2] + lds YL, usbInputBufOffset;2 [4] + clr YH ;1 [5] + subi YL, lo8(-(usbRxBuf));1 [6] + sbci YH, hi8(-(usbRxBuf));1 [7] + + sbis USBIN, USBMINUS ;1 [8] we want two bits K [sample 1 cycle too early] + rjmp haveTwoBitsK ;2 [10] + pop YH ;2 [11] undo the push from before + rjmp waitForK ;2 [13] this was not the end of sync, retry +haveTwoBitsK: +;---------------------------------------------------------------------------- +; push more registers and initialize values while we sample the first bits: +;---------------------------------------------------------------------------- + push shift ;2 [16] + push x1 ;2 [12] + push x2 ;2 [14] + + in x1, USBIN ;1 [17] <-- sample bit 0 + ldi shift, 0xff ;1 [18] + bst x1, USBMINUS ;1 [19] + bld shift, 0 ;1 [20] + push x3 ;2 [22] + push cnt ;2 [24] + + in x2, USBIN ;1 [25] <-- sample bit 1 + ser x3 ;1 [26] [inserted init instruction] + eor x1, x2 ;1 [27] + bst x1, USBMINUS ;1 [28] + bld shift, 1 ;1 [29] + ldi cnt, USB_BUFSIZE;1 [30] [inserted init instruction] + rjmp rxbit2 ;2 [32] + +;---------------------------------------------------------------------------- +; Receiver loop (numbers in brackets are cycles within byte after instr) +;---------------------------------------------------------------------------- + +unstuff0: ;1 (branch taken) + andi x3, ~0x01 ;1 [15] + mov x1, x2 ;1 [16] x2 contains last sampled (stuffed) bit + in x2, USBIN ;1 [17] <-- sample bit 1 again + ori shift, 0x01 ;1 [18] + rjmp didUnstuff0 ;2 [20] + +unstuff1: ;1 (branch taken) + mov x2, x1 ;1 [21] x1 contains last sampled (stuffed) bit + andi x3, ~0x02 ;1 [22] + ori shift, 0x02 ;1 [23] + nop ;1 [24] + in x1, USBIN ;1 [25] <-- sample bit 2 again + rjmp didUnstuff1 ;2 [27] + +unstuff2: ;1 (branch taken) + andi x3, ~0x04 ;1 [29] + ori shift, 0x04 ;1 [30] + mov x1, x2 ;1 [31] x2 contains last sampled (stuffed) bit + nop ;1 [32] + in x2, USBIN ;1 [33] <-- sample bit 3 + rjmp didUnstuff2 ;2 [35] + +unstuff3: ;1 (branch taken) + in x2, USBIN ;1 [34] <-- sample stuffed bit 3 [one cycle too late] + andi x3, ~0x08 ;1 [35] + ori shift, 0x08 ;1 [36] + rjmp didUnstuff3 ;2 [38] + +unstuff4: ;1 (branch taken) + andi x3, ~0x10 ;1 [40] + in x1, USBIN ;1 [41] <-- sample stuffed bit 4 + ori shift, 0x10 ;1 [42] + rjmp didUnstuff4 ;2 [44] + +unstuff5: ;1 (branch taken) + andi x3, ~0x20 ;1 [48] + in x2, USBIN ;1 [49] <-- sample stuffed bit 5 + ori shift, 0x20 ;1 [50] + rjmp didUnstuff5 ;2 [52] + +unstuff6: ;1 (branch taken) + andi x3, ~0x40 ;1 [56] + in x1, USBIN ;1 [57] <-- sample stuffed bit 6 + ori shift, 0x40 ;1 [58] + rjmp didUnstuff6 ;2 [60] + +; extra jobs done during bit interval: +; bit 0: store, clear [SE0 is unreliable here due to bit dribbling in hubs] +; bit 1: se0 check +; bit 2: overflow check +; bit 3: recovery from delay [bit 0 tasks took too long] +; bit 4: none +; bit 5: none +; bit 6: none +; bit 7: jump, eor +rxLoop: + eor x3, shift ;1 [0] reconstruct: x3 is 0 at bit locations we changed, 1 at others + in x1, USBIN ;1 [1] <-- sample bit 0 + st y+, x3 ;2 [3] store data + ser x3 ;1 [4] + nop ;1 [5] + eor x2, x1 ;1 [6] + bst x2, USBMINUS;1 [7] + bld shift, 0 ;1 [8] + in x2, USBIN ;1 [9] <-- sample bit 1 (or possibly bit 0 stuffed) + andi x2, USBMASK ;1 [10] + breq se0 ;1 [11] SE0 check for bit 1 + andi shift, 0xf9 ;1 [12] +didUnstuff0: + breq unstuff0 ;1 [13] + eor x1, x2 ;1 [14] + bst x1, USBMINUS;1 [15] + bld shift, 1 ;1 [16] +rxbit2: + in x1, USBIN ;1 [17] <-- sample bit 2 (or possibly bit 1 stuffed) + andi shift, 0xf3 ;1 [18] + breq unstuff1 ;1 [19] do remaining work for bit 1 +didUnstuff1: + subi cnt, 1 ;1 [20] + brcs overflow ;1 [21] loop control + eor x2, x1 ;1 [22] + bst x2, USBMINUS;1 [23] + bld shift, 2 ;1 [24] + in x2, USBIN ;1 [25] <-- sample bit 3 (or possibly bit 2 stuffed) + andi shift, 0xe7 ;1 [26] + breq unstuff2 ;1 [27] +didUnstuff2: + eor x1, x2 ;1 [28] + bst x1, USBMINUS;1 [29] + bld shift, 3 ;1 [30] +didUnstuff3: + andi shift, 0xcf ;1 [31] + breq unstuff3 ;1 [32] + in x1, USBIN ;1 [33] <-- sample bit 4 + eor x2, x1 ;1 [34] + bst x2, USBMINUS;1 [35] + bld shift, 4 ;1 [36] +didUnstuff4: + andi shift, 0x9f ;1 [37] + breq unstuff4 ;1 [38] + nop2 ;2 [40] + in x2, USBIN ;1 [41] <-- sample bit 5 + eor x1, x2 ;1 [42] + bst x1, USBMINUS;1 [43] + bld shift, 5 ;1 [44] +didUnstuff5: + andi shift, 0x3f ;1 [45] + breq unstuff5 ;1 [46] + nop2 ;2 [48] + in x1, USBIN ;1 [49] <-- sample bit 6 + eor x2, x1 ;1 [50] + bst x2, USBMINUS;1 [51] + bld shift, 6 ;1 [52] +didUnstuff6: + cpi shift, 0x02 ;1 [53] + brlo unstuff6 ;1 [54] + nop2 ;2 [56] + in x2, USBIN ;1 [57] <-- sample bit 7 + eor x1, x2 ;1 [58] + bst x1, USBMINUS;1 [59] + bld shift, 7 ;1 [60] +didUnstuff7: + cpi shift, 0x04 ;1 [61] + brsh rxLoop ;2 [63] loop control +unstuff7: + andi x3, ~0x80 ;1 [63] + ori shift, 0x80 ;1 [64] + in x2, USBIN ;1 [65] <-- sample stuffed bit 7 + nop ;1 [66] + rjmp didUnstuff7 ;2 [68] + +macro POP_STANDARD ; 12 cycles + pop cnt + pop x3 + pop x2 + pop x1 + pop shift + pop YH + endm +macro POP_RETI ; 5 cycles + pop YL + out SREG, YL + pop YL + endm + +#include "asmcommon.inc" + +;---------------------------------------------------------------------------- +; Transmitting data +;---------------------------------------------------------------------------- + +txByteLoop: +txBitloop: +stuffN1Delay: ; [03] + ror shift ;[-5] [11] [59] + brcc doExorN1 ;[-4] [60] + subi x4, 1 ;[-3] + brne commonN1 ;[-2] + lsl shift ;[-1] compensate ror after rjmp stuffDelay + nop ;[00] stuffing consists of just waiting 8 cycles + rjmp stuffN1Delay ;[01] after ror, C bit is reliably clear + +sendNakAndReti: ;0 [-19] 19 cycles until SOP + ldi x3, USBPID_NAK ;1 [-18] + rjmp usbSendX3 ;2 [-16] +sendAckAndReti: ;0 [-19] 19 cycles until SOP + ldi x3, USBPID_ACK ;1 [-18] + rjmp usbSendX3 ;2 [-16] +sendCntAndReti: ;0 [-17] 17 cycles until SOP + mov x3, cnt ;1 [-16] +usbSendX3: ;0 [-16] + ldi YL, 20 ;1 [-15] 'x3' is R20 + ldi YH, 0 ;1 [-14] + ldi cnt, 2 ;1 [-13] +; rjmp usbSendAndReti fallthrough + +; USB spec says: +; idle = J +; J = (D+ = 0), (D- = 1) or USBOUT = 0x01 +; K = (D+ = 1), (D- = 0) or USBOUT = 0x02 +; Spec allows 7.5 bit times from EOP to SOP for replies (= 60 cycles) + +;usbSend: +;pointer to data in 'Y' +;number of bytes in 'cnt' -- including sync byte +;uses: x1...x2, x4, shift, cnt, Y [x1 = mirror USBOUT, x2 = USBMASK, x4 = bitstuff cnt] +;Numbers in brackets are time since first bit of sync pattern is sent (start of instruction) +usbSendAndReti: + in x2, USBDDR ;[-12] 12 cycles until SOP + ori x2, USBMASK ;[-11] + sbi USBOUT, USBMINUS ;[-10] prepare idle state; D+ and D- must have been 0 (no pullups) + out USBDDR, x2 ;[-8] <--- acquire bus + in x1, USBOUT ;[-7] port mirror for tx loop + ldi shift, 0x40 ;[-6] sync byte is first byte sent (we enter loop after ror) + ldi x2, USBMASK ;[-5] + push x4 ;[-4] +doExorN1: + eor x1, x2 ;[-2] [06] [62] + ldi x4, 6 ;[-1] [07] [63] +commonN1: +stuffN2Delay: + out USBOUT, x1 ;[00] [08] [64] <--- set bit + ror shift ;[01] + brcc doExorN2 ;[02] + subi x4, 1 ;[03] + brne commonN2 ;[04] + lsl shift ;[05] compensate ror after rjmp stuffDelay + rjmp stuffN2Delay ;[06] after ror, C bit is reliably clear +doExorN2: + eor x1, x2 ;[04] [12] + ldi x4, 6 ;[05] [13] +commonN2: + nop ;[06] [14] + subi cnt, 171 ;[07] [15] trick: (3 * 171) & 0xff = 1 + out USBOUT, x1 ;[08] [16] <--- set bit + brcs txBitloop ;[09] [25] [41] + +stuff6Delay: + ror shift ;[42] [50] + brcc doExor6 ;[43] + subi x4, 1 ;[44] + brne common6 ;[45] + lsl shift ;[46] compensate ror after rjmp stuffDelay + nop ;[47] stuffing consists of just waiting 8 cycles + rjmp stuff6Delay ;[48] after ror, C bit is reliably clear +doExor6: + eor x1, x2 ;[45] [53] + ldi x4, 6 ;[46] +common6: +stuff7Delay: + ror shift ;[47] [55] + out USBOUT, x1 ;[48] <--- set bit + brcc doExor7 ;[49] + subi x4, 1 ;[50] + brne common7 ;[51] + lsl shift ;[52] compensate ror after rjmp stuffDelay + rjmp stuff7Delay ;[53] after ror, C bit is reliably clear +doExor7: + eor x1, x2 ;[51] [59] + ldi x4, 6 ;[52] +common7: + ld shift, y+ ;[53] + tst cnt ;[55] + out USBOUT, x1 ;[56] <--- set bit + brne txByteLoop ;[57] + +;make SE0: + cbr x1, USBMASK ;[58] prepare SE0 [spec says EOP may be 15 to 18 cycles] + lds x2, usbNewDeviceAddr;[59] + lsl x2 ;[61] we compare with left shifted address + subi YL, 2 + 20 ;[62] Only assign address on data packets, not ACK/NAK in x3 + sbci YH, 0 ;[63] + out USBOUT, x1 ;[00] <-- out SE0 -- from now 2 bits = 16 cycles until bus idle +;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm: +;set address only after data packet was sent, not after handshake + breq skipAddrAssign ;[01] + sts usbDeviceAddr, x2 ; if not skipped: SE0 is one cycle longer +skipAddrAssign: +;end of usbDeviceAddress transfer + ldi x2, 1<<USB_INTR_PENDING_BIT;[03] int0 occurred during TX -- clear pending flag + USB_STORE_PENDING(x2) ;[04] + ori x1, USBIDLE ;[05] + in x2, USBDDR ;[06] + cbr x2, USBMASK ;[07] set both pins to input + mov x3, x1 ;[08] + cbr x3, USBMASK ;[09] configure no pullup on both pins + pop x4 ;[10] + nop2 ;[12] + nop2 ;[14] + out USBOUT, x1 ;[16] <-- out J (idle) -- end of SE0 (EOP signal) + out USBDDR, x2 ;[17] <-- release bus now + out USBOUT, x3 ;[18] <-- ensure no pull-up resistors are active + rjmp doReturn diff --git a/usbdrv/usbdrvasm128.inc b/usbdrv/usbdrvasm128.inc new file mode 100644 index 0000000..8f67bcc --- /dev/null +++ b/usbdrv/usbdrvasm128.inc @@ -0,0 +1,749 @@ +/* Name: usbdrvasm128.inc + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2008-10-11 + * Tabsize: 4 + * Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* Do not link this file! Link usbdrvasm.S instead, which includes the + * appropriate implementation! + */ + +/* +General Description: +This file is the 12.8 MHz version of the USB driver. It is intended for use +with the internal RC oscillator. Although 12.8 MHz is outside the guaranteed +calibration range of the oscillator, almost all AVRs can reach this frequency. +This version contains a phase locked loop in the receiver routine to cope with +slight clock rate deviations of up to +/- 1%. + +See usbdrv.h for a description of the entire driver. + +LIMITATIONS +=========== +Although it may seem very handy to save the crystal and use the internal +RC oscillator of the CPU, this method (and this module) has some serious +limitations: +(1) The guaranteed calibration range of the oscillator is only 8.1 MHz. +They typical range is 14.5 MHz and most AVRs can actually reach this rate. +(2) Writing EEPROM and Flash may be unreliable (short data lifetime) since +the write procedure is timed from the RC oscillator. +(3) End Of Packet detection (SE0) should be in bit 1, bit it is only checked +if bits 0 and 1 both read as 0 on D- and D+ read as 0 in the middle. This may +cause problems with old hubs which delay SE0 by up to one cycle. +(4) Code size is much larger than that of the other modules. + +Since almost all of this code is timing critical, don't change unless you +really know what you are doing! Many parts require not only a maximum number +of CPU cycles, but even an exact number of cycles! + +Implementation notes: +====================== +min frequency: 67 cycles for 8 bit -> 12.5625 MHz +max frequency: 69.286 cycles for 8 bit -> 12.99 MHz +nominal frequency: 12.77 MHz ( = sqrt(min * max)) + +sampling positions: (next even number in range [+/- 0.5]) +cycle index range: 0 ... 66 +bits: +.5, 8.875, 17.25, 25.625, 34, 42.375, 50.75, 59.125 +[0/1], [9], [17], [25/+26], [34], [+42/43], [51], [59] + +bit number: 0 1 2 3 4 5 6 7 +spare cycles 1 2 1 2 1 1 1 0 + +operations to perform: duration cycle + ---------------- + eor fix, shift 1 -> 00 + andi phase, USBMASK 1 -> 08 + breq se0 1 -> 16 (moved to 11) + st y+, data 2 -> 24, 25 + mov data, fix 1 -> 33 + ser data 1 -> 41 + subi cnt, 1 1 -> 49 + brcs overflow 1 -> 50 + +layout of samples and operations: +[##] = sample bit +<##> = sample phase +*##* = operation + +0: *00* [01] 02 03 04 <05> 06 07 +1: *08* [09] 10 11 12 <13> 14 15 *16* +2: [17] 18 19 20 <21> 22 23 +3: *24* *25* [26] 27 28 29 <30> 31 32 +4: *33* [34] 35 36 37 <38> 39 40 +5: *41* [42] 43 44 45 <46> 47 48 +6: *49* *50* [51] 52 53 54 <55> 56 57 58 +7: [59] 60 61 62 <63> 64 65 66 +*****************************************************************************/ + +/* we prefer positive expressions (do if condition) instead of negative + * (skip if condition), therefore use defines for skip instructions: + */ +#define ifioclr sbis +#define ifioset sbic +#define ifrclr sbrs +#define ifrset sbrc + +/* The registers "fix" and "data" swap their meaning during the loop. Use + * defines to keep their name constant. + */ +#define fix x2 +#define data x1 +#undef phase /* phase has a default definition to x4 */ +#define phase x3 + + +USB_INTR_VECTOR: +;order of registers pushed: YL, SREG [sofError], YH, shift, x1, x2, x3, cnt, r0 + push YL ;2 push only what is necessary to sync with edge ASAP + in YL, SREG ;1 + push YL ;2 +;---------------------------------------------------------------------------- +; Synchronize with sync pattern: +;---------------------------------------------------------------------------- +;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K] +;sync up with J to K edge during sync pattern -- use fastest possible loops +;The first part waits at most 1 bit long since we must be in sync pattern. +;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to +;waitForJ, ensure that this prerequisite is met. +waitForJ: + inc YL + sbis USBIN, USBMINUS + brne waitForJ ; just make sure we have ANY timeout +waitForK: +;The following code results in a sampling window of 1/4 bit which meets the spec. + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS ;[0] + rjmp foundK ;[1] +#if USB_COUNT_SOF + lds YL, usbSofCount + inc YL + sts usbSofCount, YL +#endif /* USB_COUNT_SOF */ +#ifdef USB_SOF_HOOK + USB_SOF_HOOK +#endif + rjmp sofError + +foundK: +;{3, 5} after falling D- edge, average delay: 4 cycles [we want 4 for center sampling] +;we have 1 bit time for setup purposes, then sample again. Numbers in brackets +;are cycles from center of first sync (double K) bit after the instruction + push YH ;[2] + lds YL, usbInputBufOffset;[4] + clr YH ;[6] + subi YL, lo8(-(usbRxBuf));[7] + sbci YH, hi8(-(usbRxBuf));[8] + + sbis USBIN, USBMINUS ;[9] we want two bits K [we want to sample at 8 + 4 - 1.5 = 10.5] + rjmp haveTwoBitsK ;[10] + pop YH ;[11] undo the push from before + rjmp waitForK ;[13] this was not the end of sync, retry +haveTwoBitsK: +;---------------------------------------------------------------------------- +; push more registers and initialize values while we sample the first bits: +;---------------------------------------------------------------------------- +#define fix x2 +#define data x1 + + push shift ;[12] + push x1 ;[14] + push x2 ;[16] + ldi shift, 0x80 ;[18] prevent bit-unstuffing but init low bits to 0 + ifioset USBIN, USBMINUS ;[19] [01] <--- bit 0 [10.5 + 8 = 18.5] + ori shift, 1<<0 ;[02] + push x3 ;[03] + push cnt ;[05] + push r0 ;[07] + ifioset USBIN, USBMINUS ;[09] <--- bit 1 + ori shift, 1<<1 ;[10] + ser fix ;[11] + ldi cnt, USB_BUFSIZE ;[12] + mov data, shift ;[13] + lsl shift ;[14] + nop2 ;[15] + ifioset USBIN, USBMINUS ;[17] <--- bit 2 + ori data, 3<<2 ;[18] store in bit 2 AND bit 3 + eor shift, data ;[19] do nrzi decoding + andi data, 1<<3 ;[20] + in phase, USBIN ;[21] <- phase + brne jumpToEntryAfterSet ;[22] if USBMINS at bit 3 was 1 + nop ;[23] + rjmp entryAfterClr ;[24] +jumpToEntryAfterSet: + rjmp entryAfterSet ;[24] + +;---------------------------------------------------------------------------- +; Receiver loop (numbers in brackets are cycles within byte after instr) +;---------------------------------------------------------------------------- +#undef fix +#define fix x1 +#undef data +#define data x2 + +bit7IsSet: + ifrclr phase, USBMINUS ;[62] check phase only if D- changed + lpm ;[63] + in phase, USBIN ;[64] <- phase (one cycle too late) + ori shift, 1 << 7 ;[65] + nop ;[66] +;;;;rjmp bit0AfterSet ; -> [00] == [67] moved block up to save jump +bit0AfterSet: + eor fix, shift ;[00] +#undef fix +#define fix x2 +#undef data +#define data x1 /* we now have result in data, fix is reset to 0xff */ + ifioclr USBIN, USBMINUS ;[01] <--- sample 0 + rjmp bit0IsClr ;[02] + andi shift, ~(7 << 0) ;[03] + breq unstuff0s ;[04] + in phase, USBIN ;[05] <- phase + rjmp bit1AfterSet ;[06] +unstuff0s: + in phase, USBIN ;[06] <- phase (one cycle too late) + andi fix, ~(1 << 0) ;[07] + ifioclr USBIN, USBMINUS ;[00] + ifioset USBIN, USBPLUS ;[01] + rjmp bit0IsClr ;[02] executed if first expr false or second true +se0AndStore: ; executed only if both bits 0 + st y+, x1 ;[15/17] cycles after start of byte + rjmp se0 ;[17/19] + +bit0IsClr: + ifrset phase, USBMINUS ;[04] check phase only if D- changed + lpm ;[05] + in phase, USBIN ;[06] <- phase (one cycle too late) + ori shift, 1 << 0 ;[07] +bit1AfterClr: + andi phase, USBMASK ;[08] + ifioset USBIN, USBMINUS ;[09] <--- sample 1 + rjmp bit1IsSet ;[10] + breq se0AndStore ;[11] if D- was 0 in bits 0 AND 1 and D+ was 0 in between, we have SE0 + andi shift, ~(7 << 1) ;[12] + in phase, USBIN ;[13] <- phase + breq unstuff1c ;[14] + rjmp bit2AfterClr ;[15] +unstuff1c: + andi fix, ~(1 << 1) ;[16] + nop2 ;[08] + nop2 ;[10] +bit1IsSet: + ifrclr phase, USBMINUS ;[12] check phase only if D- changed + lpm ;[13] + in phase, USBIN ;[14] <- phase (one cycle too late) + ori shift, 1 << 1 ;[15] + nop ;[16] +bit2AfterSet: + ifioclr USBIN, USBMINUS ;[17] <--- sample 2 + rjmp bit2IsClr ;[18] + andi shift, ~(7 << 2) ;[19] + breq unstuff2s ;[20] + in phase, USBIN ;[21] <- phase + rjmp bit3AfterSet ;[22] +unstuff2s: + in phase, USBIN ;[22] <- phase (one cycle too late) + andi fix, ~(1 << 2) ;[23] + nop2 ;[16] + nop2 ;[18] +bit2IsClr: + ifrset phase, USBMINUS ;[20] check phase only if D- changed + lpm ;[21] + in phase, USBIN ;[22] <- phase (one cycle too late) + ori shift, 1 << 2 ;[23] +bit3AfterClr: + st y+, data ;[24] +entryAfterClr: + ifioset USBIN, USBMINUS ;[26] <--- sample 3 + rjmp bit3IsSet ;[27] + andi shift, ~(7 << 3) ;[28] + breq unstuff3c ;[29] + in phase, USBIN ;[30] <- phase + rjmp bit4AfterClr ;[31] +unstuff3c: + in phase, USBIN ;[31] <- phase (one cycle too late) + andi fix, ~(1 << 3) ;[32] + nop2 ;[25] + nop2 ;[27] +bit3IsSet: + ifrclr phase, USBMINUS ;[29] check phase only if D- changed + lpm ;[30] + in phase, USBIN ;[31] <- phase (one cycle too late) + ori shift, 1 << 3 ;[32] +bit4AfterSet: + mov data, fix ;[33] undo this move by swapping defines +#undef fix +#define fix x1 +#undef data +#define data x2 + ifioclr USBIN, USBMINUS ;[34] <--- sample 4 + rjmp bit4IsClr ;[35] + andi shift, ~(7 << 4) ;[36] + breq unstuff4s ;[37] + in phase, USBIN ;[38] <- phase + rjmp bit5AfterSet ;[39] +unstuff4s: + in phase, USBIN ;[39] <- phase (one cycle too late) + andi fix, ~(1 << 4) ;[40] + nop2 ;[33] + nop2 ;[35] +bit4IsClr: + ifrset phase, USBMINUS ;[37] check phase only if D- changed + lpm ;[38] + in phase, USBIN ;[39] <- phase (one cycle too late) + ori shift, 1 << 4 ;[40] +bit5AfterClr: + ser data ;[41] + ifioset USBIN, USBMINUS ;[42] <--- sample 5 + rjmp bit5IsSet ;[43] + andi shift, ~(7 << 5) ;[44] + breq unstuff5c ;[45] + in phase, USBIN ;[46] <- phase + rjmp bit6AfterClr ;[47] +unstuff5c: + in phase, USBIN ;[47] <- phase (one cycle too late) + andi fix, ~(1 << 5) ;[48] + nop2 ;[41] + nop2 ;[43] +bit5IsSet: + ifrclr phase, USBMINUS ;[45] check phase only if D- changed + lpm ;[46] + in phase, USBIN ;[47] <- phase (one cycle too late) + ori shift, 1 << 5 ;[48] +bit6AfterSet: + subi cnt, 1 ;[49] + brcs jumpToOverflow ;[50] + ifioclr USBIN, USBMINUS ;[51] <--- sample 6 + rjmp bit6IsClr ;[52] + andi shift, ~(3 << 6) ;[53] + cpi shift, 2 ;[54] + in phase, USBIN ;[55] <- phase + brlt unstuff6s ;[56] + rjmp bit7AfterSet ;[57] + +jumpToOverflow: + rjmp overflow + +unstuff6s: + andi fix, ~(1 << 6) ;[50] + lpm ;[51] +bit6IsClr: + ifrset phase, USBMINUS ;[54] check phase only if D- changed + lpm ;[55] + in phase, USBIN ;[56] <- phase (one cycle too late) + ori shift, 1 << 6 ;[57] + nop ;[58] +bit7AfterClr: + ifioset USBIN, USBMINUS ;[59] <--- sample 7 + rjmp bit7IsSet ;[60] + andi shift, ~(1 << 7) ;[61] + cpi shift, 4 ;[62] + in phase, USBIN ;[63] <- phase + brlt unstuff7c ;[64] + rjmp bit0AfterClr ;[65] -> [00] == [67] +unstuff7c: + andi fix, ~(1 << 7) ;[58] + nop ;[59] + rjmp bit7IsSet ;[60] + +bit7IsClr: + ifrset phase, USBMINUS ;[62] check phase only if D- changed + lpm ;[63] + in phase, USBIN ;[64] <- phase (one cycle too late) + ori shift, 1 << 7 ;[65] + nop ;[66] +;;;;rjmp bit0AfterClr ; -> [00] == [67] moved block up to save jump +bit0AfterClr: + eor fix, shift ;[00] +#undef fix +#define fix x2 +#undef data +#define data x1 /* we now have result in data, fix is reset to 0xff */ + ifioset USBIN, USBMINUS ;[01] <--- sample 0 + rjmp bit0IsSet ;[02] + andi shift, ~(7 << 0) ;[03] + breq unstuff0c ;[04] + in phase, USBIN ;[05] <- phase + rjmp bit1AfterClr ;[06] +unstuff0c: + in phase, USBIN ;[06] <- phase (one cycle too late) + andi fix, ~(1 << 0) ;[07] + ifioclr USBIN, USBMINUS ;[00] + ifioset USBIN, USBPLUS ;[01] + rjmp bit0IsSet ;[02] executed if first expr false or second true + rjmp se0AndStore ;[03] executed only if both bits 0 +bit0IsSet: + ifrclr phase, USBMINUS ;[04] check phase only if D- changed + lpm ;[05] + in phase, USBIN ;[06] <- phase (one cycle too late) + ori shift, 1 << 0 ;[07] +bit1AfterSet: + andi shift, ~(7 << 1) ;[08] compensated by "ori shift, 1<<1" if bit1IsClr + ifioclr USBIN, USBMINUS ;[09] <--- sample 1 + rjmp bit1IsClr ;[10] + breq unstuff1s ;[11] + nop2 ;[12] do not check for SE0 if bit 0 was 1 + in phase, USBIN ;[14] <- phase (one cycle too late) + rjmp bit2AfterSet ;[15] +unstuff1s: + in phase, USBIN ;[13] <- phase + andi fix, ~(1 << 1) ;[14] + lpm ;[07] + nop2 ;[10] +bit1IsClr: + ifrset phase, USBMINUS ;[12] check phase only if D- changed + lpm ;[13] + in phase, USBIN ;[14] <- phase (one cycle too late) + ori shift, 1 << 1 ;[15] + nop ;[16] +bit2AfterClr: + ifioset USBIN, USBMINUS ;[17] <--- sample 2 + rjmp bit2IsSet ;[18] + andi shift, ~(7 << 2) ;[19] + breq unstuff2c ;[20] + in phase, USBIN ;[21] <- phase + rjmp bit3AfterClr ;[22] +unstuff2c: + in phase, USBIN ;[22] <- phase (one cycle too late) + andi fix, ~(1 << 2) ;[23] + nop2 ;[16] + nop2 ;[18] +bit2IsSet: + ifrclr phase, USBMINUS ;[20] check phase only if D- changed + lpm ;[21] + in phase, USBIN ;[22] <- phase (one cycle too late) + ori shift, 1 << 2 ;[23] +bit3AfterSet: + st y+, data ;[24] +entryAfterSet: + ifioclr USBIN, USBMINUS ;[26] <--- sample 3 + rjmp bit3IsClr ;[27] + andi shift, ~(7 << 3) ;[28] + breq unstuff3s ;[29] + in phase, USBIN ;[30] <- phase + rjmp bit4AfterSet ;[31] +unstuff3s: + in phase, USBIN ;[31] <- phase (one cycle too late) + andi fix, ~(1 << 3) ;[32] + nop2 ;[25] + nop2 ;[27] +bit3IsClr: + ifrset phase, USBMINUS ;[29] check phase only if D- changed + lpm ;[30] + in phase, USBIN ;[31] <- phase (one cycle too late) + ori shift, 1 << 3 ;[32] +bit4AfterClr: + mov data, fix ;[33] undo this move by swapping defines +#undef fix +#define fix x1 +#undef data +#define data x2 + ifioset USBIN, USBMINUS ;[34] <--- sample 4 + rjmp bit4IsSet ;[35] + andi shift, ~(7 << 4) ;[36] + breq unstuff4c ;[37] + in phase, USBIN ;[38] <- phase + rjmp bit5AfterClr ;[39] +unstuff4c: + in phase, USBIN ;[39] <- phase (one cycle too late) + andi fix, ~(1 << 4) ;[40] + nop2 ;[33] + nop2 ;[35] +bit4IsSet: + ifrclr phase, USBMINUS ;[37] check phase only if D- changed + lpm ;[38] + in phase, USBIN ;[39] <- phase (one cycle too late) + ori shift, 1 << 4 ;[40] +bit5AfterSet: + ser data ;[41] + ifioclr USBIN, USBMINUS ;[42] <--- sample 5 + rjmp bit5IsClr ;[43] + andi shift, ~(7 << 5) ;[44] + breq unstuff5s ;[45] + in phase, USBIN ;[46] <- phase + rjmp bit6AfterSet ;[47] +unstuff5s: + in phase, USBIN ;[47] <- phase (one cycle too late) + andi fix, ~(1 << 5) ;[48] + nop2 ;[41] + nop2 ;[43] +bit5IsClr: + ifrset phase, USBMINUS ;[45] check phase only if D- changed + lpm ;[46] + in phase, USBIN ;[47] <- phase (one cycle too late) + ori shift, 1 << 5 ;[48] +bit6AfterClr: + subi cnt, 1 ;[49] + brcs overflow ;[50] + ifioset USBIN, USBMINUS ;[51] <--- sample 6 + rjmp bit6IsSet ;[52] + andi shift, ~(3 << 6) ;[53] + cpi shift, 2 ;[54] + in phase, USBIN ;[55] <- phase + brlt unstuff6c ;[56] + rjmp bit7AfterClr ;[57] +unstuff6c: + andi fix, ~(1 << 6) ;[50] + lpm ;[51] +bit6IsSet: + ifrclr phase, USBMINUS ;[54] check phase only if D- changed + lpm ;[55] + in phase, USBIN ;[56] <- phase (one cycle too late) + ori shift, 1 << 6 ;[57] +bit7AfterSet: + ifioclr USBIN, USBMINUS ;[59] <--- sample 7 + rjmp bit7IsClr ;[60] + andi shift, ~(1 << 7) ;[61] + cpi shift, 4 ;[62] + in phase, USBIN ;[63] <- phase + brlt unstuff7s ;[64] + rjmp bit0AfterSet ;[65] -> [00] == [67] +unstuff7s: + andi fix, ~(1 << 7) ;[58] + nop ;[59] + rjmp bit7IsClr ;[60] + +macro POP_STANDARD ; 14 cycles + pop r0 + pop cnt + pop x3 + pop x2 + pop x1 + pop shift + pop YH + endm +macro POP_RETI ; 5 cycles + pop YL + out SREG, YL + pop YL + endm + +#include "asmcommon.inc" + +;---------------------------------------------------------------------------- +; Transmitting data +;---------------------------------------------------------------------------- + +txByteLoop: +txBitloop: +stuffN1Delay: ; [03] + ror shift ;[-5] [11] [63] + brcc doExorN1 ;[-4] [64] + subi x3, 1 ;[-3] + brne commonN1 ;[-2] + lsl shift ;[-1] compensate ror after rjmp stuffDelay + nop ;[00] stuffing consists of just waiting 8 cycles + rjmp stuffN1Delay ;[01] after ror, C bit is reliably clear + +sendNakAndReti: + ldi cnt, USBPID_NAK ;[-19] + rjmp sendCntAndReti ;[-18] +sendAckAndReti: + ldi cnt, USBPID_ACK ;[-17] +sendCntAndReti: + mov r0, cnt ;[-16] + ldi YL, 0 ;[-15] R0 address is 0 + ldi YH, 0 ;[-14] + ldi cnt, 2 ;[-13] +; rjmp usbSendAndReti fallthrough + +; USB spec says: +; idle = J +; J = (D+ = 0), (D- = 1) or USBOUT = 0x01 +; K = (D+ = 1), (D- = 0) or USBOUT = 0x02 +; Spec allows 7.5 bit times from EOP to SOP for replies (= 60 cycles) + +;usbSend: +;pointer to data in 'Y' +;number of bytes in 'cnt' -- including sync byte +;uses: x1...x3, shift, cnt, Y [x1 = mirror USBOUT, x2 = USBMASK, x3 = bitstuff cnt] +;Numbers in brackets are time since first bit of sync pattern is sent (start of instruction) +usbSendAndReti: + in x2, USBDDR ;[-10] 10 cycles until SOP + ori x2, USBMASK ;[-9] + sbi USBOUT, USBMINUS ;[-8] prepare idle state; D+ and D- must have been 0 (no pullups) + out USBDDR, x2 ;[-6] <--- acquire bus + in x1, USBOUT ;[-5] port mirror for tx loop + ldi shift, 0x40 ;[-4] sync byte is first byte sent (we enter loop after ror) + ldi x2, USBMASK ;[-3] +doExorN1: + eor x1, x2 ;[-2] [06] [62] + ldi x3, 6 ;[-1] [07] [63] +commonN1: +stuffN2Delay: + out USBOUT, x1 ;[00] [08] [64] <--- set bit + ror shift ;[01] + brcc doExorN2 ;[02] + subi x3, 1 ;[03] + brne commonN2 ;[04] + lsl shift ;[05] compensate ror after rjmp stuffDelay + rjmp stuffN2Delay ;[06] after ror, C bit is reliably clear +doExorN2: + eor x1, x2 ;[04] [12] + ldi x3, 6 ;[05] [13] +commonN2: + nop2 ;[06] [14] + subi cnt, 171 ;[08] [16] trick: (3 * 171) & 0xff = 1 + out USBOUT, x1 ;[09] [17] <--- set bit + brcs txBitloop ;[10] [27] [44] + +stuff6Delay: + ror shift ;[45] [53] + brcc doExor6 ;[46] + subi x3, 1 ;[47] + brne common6 ;[48] + lsl shift ;[49] compensate ror after rjmp stuffDelay + nop ;[50] stuffing consists of just waiting 8 cycles + rjmp stuff6Delay ;[51] after ror, C bit is reliably clear +doExor6: + eor x1, x2 ;[48] [56] + ldi x3, 6 ;[49] +common6: +stuff7Delay: + ror shift ;[50] [58] + out USBOUT, x1 ;[51] <--- set bit + brcc doExor7 ;[52] + subi x3, 1 ;[53] + brne common7 ;[54] + lsl shift ;[55] compensate ror after rjmp stuffDelay + rjmp stuff7Delay ;[56] after ror, C bit is reliably clear +doExor7: + eor x1, x2 ;[54] [62] + ldi x3, 6 ;[55] +common7: + ld shift, y+ ;[56] + nop ;[58] + tst cnt ;[59] + out USBOUT, x1 ;[60] [00]<--- set bit + brne txByteLoop ;[61] [01] +;make SE0: + cbr x1, USBMASK ;[02] prepare SE0 [spec says EOP may be 15 to 18 cycles] + lds x2, usbNewDeviceAddr;[03] + lsl x2 ;[05] we compare with left shifted address + subi YL, 2 + 0 ;[06] Only assign address on data packets, not ACK/NAK in r0 + sbci YH, 0 ;[07] + out USBOUT, x1 ;[00] <-- out SE0 -- from now 2 bits = 16 cycles until bus idle +;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm: +;set address only after data packet was sent, not after handshake + breq skipAddrAssign ;[01] + sts usbDeviceAddr, x2 ; if not skipped: SE0 is one cycle longer +skipAddrAssign: +;end of usbDeviceAddress transfer + ldi x2, 1<<USB_INTR_PENDING_BIT;[03] int0 occurred during TX -- clear pending flag + USB_STORE_PENDING(x2) ;[04] + ori x1, USBIDLE ;[05] + in x2, USBDDR ;[06] + cbr x2, USBMASK ;[07] set both pins to input + mov x3, x1 ;[08] + cbr x3, USBMASK ;[09] configure no pullup on both pins + lpm ;[10] + lpm ;[13] + out USBOUT, x1 ;[16] <-- out J (idle) -- end of SE0 (EOP signal) + out USBDDR, x2 ;[17] <-- release bus now + out USBOUT, x3 ;[18] <-- ensure no pull-up resistors are active + rjmp doReturn + + + +/***************************************************************************** +The following PHP script generates a code skeleton for the receiver routine: + +<?php + +function printCmdBuffer($thisBit) +{ +global $cycle; + + $nextBit = ($thisBit + 1) % 8; + $s = ob_get_contents(); + ob_end_clean(); + $s = str_replace("#", $thisBit, $s); + $s = str_replace("@", $nextBit, $s); + $lines = explode("\n", $s); + for($i = 0; $i < count($lines); $i++){ + $s = $lines[$i]; + if(ereg("\\[([0-9-][0-9])\\]", $s, $regs)){ + $c = $cycle + (int)$regs[1]; + $s = ereg_replace("\\[[0-9-][0-9]\\]", sprintf("[%02d]", $c), $s); + } + if(strlen($s) > 0) + echo "$s\n"; + } +} + +function printBit($isAfterSet, $bitNum) +{ + ob_start(); + if($isAfterSet){ +?> + ifioclr USBIN, USBMINUS ;[00] <--- sample + rjmp bit#IsClr ;[01] + andi shift, ~(7 << #) ;[02] + breq unstuff#s ;[03] + in phase, USBIN ;[04] <- phase + rjmp bit@AfterSet ;[05] +unstuff#s: + in phase, USBIN ;[05] <- phase (one cycle too late) + andi fix, ~(1 << #) ;[06] + nop2 ;[-1] + nop2 ;[01] +bit#IsClr: + ifrset phase, USBMINUS ;[03] check phase only if D- changed + lpm ;[04] + in phase, USBIN ;[05] <- phase (one cycle too late) + ori shift, 1 << # ;[06] +<?php + }else{ +?> + ifioset USBIN, USBMINUS ;[00] <--- sample + rjmp bit#IsSet ;[01] + andi shift, ~(7 << #) ;[02] + breq unstuff#c ;[03] + in phase, USBIN ;[04] <- phase + rjmp bit@AfterClr ;[05] +unstuff#c: + in phase, USBIN ;[05] <- phase (one cycle too late) + andi fix, ~(1 << #) ;[06] + nop2 ;[-1] + nop2 ;[01] +bit#IsSet: + ifrclr phase, USBMINUS ;[03] check phase only if D- changed + lpm ;[04] + in phase, USBIN ;[05] <- phase (one cycle too late) + ori shift, 1 << # ;[06] +<?php + } + printCmdBuffer($bitNum); +} + +$bitStartCycles = array(1, 9, 17, 26, 34, 42, 51, 59); +for($i = 0; $i < 16; $i++){ + $bit = $i % 8; + $emitClrCode = ($i + (int)($i / 8)) % 2; + $cycle = $bitStartCycles[$bit]; + if($emitClrCode){ + printf("bit%dAfterClr:\n", $bit); + }else{ + printf("bit%dAfterSet:\n", $bit); + } + ob_start(); + echo " ***** ;[-1]\n"; + printCmdBuffer($bit); + printBit(!$emitClrCode, $bit); + if($i == 7) + echo "\n"; +} + +?> +*****************************************************************************/ diff --git a/usbdrv/usbdrvasm15.inc b/usbdrv/usbdrvasm15.inc new file mode 100644 index 0000000..33bcf0e --- /dev/null +++ b/usbdrv/usbdrvasm15.inc @@ -0,0 +1,422 @@ +/* Name: usbdrvasm15.inc + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: contributed by V. Bosch + * Creation Date: 2007-08-06 + * Tabsize: 4 + * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* Do not link this file! Link usbdrvasm.S instead, which includes the + * appropriate implementation! + */ + +/* +General Description: +This file is the 15 MHz version of the asssembler part of the USB driver. It +requires a 15 MHz crystal (not a ceramic resonator and not a calibrated RC +oscillator). + +See usbdrv.h for a description of the entire driver. + +Since almost all of this code is timing critical, don't change unless you +really know what you are doing! Many parts require not only a maximum number +of CPU cycles, but even an exact number of cycles! +*/ + +;max stack usage: [ret(2), YL, SREG, YH, bitcnt, shift, x1, x2, x3, x4, cnt] = 12 bytes +;nominal frequency: 15 MHz -> 10.0 cycles per bit, 80.0 cycles per byte +; Numbers in brackets are clocks counted from center of last sync bit +; when instruction starts + +;---------------------------------------------------------------------------- +; order of registers pushed: +; YL, SREG [sofError] YH, shift, x1, x2, x3, bitcnt, cnt, x4 +;---------------------------------------------------------------------------- +USB_INTR_VECTOR: + push YL ;2 push only what is necessary to sync with edge ASAP + in YL, SREG ;1 + push YL ;2 +;---------------------------------------------------------------------------- +; Synchronize with sync pattern: +; +; sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K] +; sync up with J to K edge during sync pattern -- use fastest possible loops +;The first part waits at most 1 bit long since we must be in sync pattern. +;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to +;waitForJ, ensure that this prerequisite is met. +waitForJ: + inc YL + sbis USBIN, USBMINUS + brne waitForJ ; just make sure we have ANY timeout +;------------------------------------------------------------------------------- +; The following code results in a sampling window of < 1/4 bit +; which meets the spec. +;------------------------------------------------------------------------------- +waitForK: ;- + sbis USBIN, USBMINUS ;1 [00] <-- sample + rjmp foundK ;2 [01] + sbis USBIN, USBMINUS ; <-- sample + rjmp foundK + sbis USBIN, USBMINUS ; <-- sample + rjmp foundK + sbis USBIN, USBMINUS ; <-- sample + rjmp foundK + sbis USBIN, USBMINUS ; <-- sample + rjmp foundK + sbis USBIN, USBMINUS ; <-- sample + rjmp foundK +#if USB_COUNT_SOF + lds YL, usbSofCount + inc YL + sts usbSofCount, YL +#endif /* USB_COUNT_SOF */ +#ifdef USB_SOF_HOOK + USB_SOF_HOOK +#endif + rjmp sofError +;------------------------------------------------------------------------------ +; {3, 5} after falling D- edge, average delay: 4 cycles [we want 5 for +; center sampling] +; we have 1 bit time for setup purposes, then sample again. +; Numbers in brackets are cycles from center of first sync (double K) +; bit after the instruction +;------------------------------------------------------------------------------ +foundK: ;- [02] + lds YL, usbInputBufOffset;2 [03+04] tx loop + push YH ;2 [05+06] + clr YH ;1 [07] + subi YL, lo8(-(usbRxBuf)) ;1 [08] [rx loop init] + sbci YH, hi8(-(usbRxBuf)) ;1 [09] [rx loop init] + push shift ;2 [10+11] + ser shift ;1 [12] + sbis USBIN, USBMINUS ;1 [-1] [13] <--sample:we want two bits K (sample 1 cycle too early) + rjmp haveTwoBitsK ;2 [00] [14] + pop shift ;2 [15+16] undo the push from before + pop YH ;2 [17+18] undo the push from before + rjmp waitForK ;2 [19+20] this was not the end of sync, retry +; The entire loop from waitForK until rjmp waitForK above must not exceed two +; bit times (= 20 cycles). + +;---------------------------------------------------------------------------- +; push more registers and initialize values while we sample the first bits: +;---------------------------------------------------------------------------- +haveTwoBitsK: ;- [01] + push x1 ;2 [02+03] + push x2 ;2 [04+05] + push x3 ;2 [06+07] + push bitcnt ;2 [08+09] + in x1, USBIN ;1 [00] [10] <-- sample bit 0 + bst x1, USBMINUS ;1 [01] + bld shift, 0 ;1 [02] + push cnt ;2 [03+04] + ldi cnt, USB_BUFSIZE ;1 [05] + push x4 ;2 [06+07] tx loop + rjmp rxLoop ;2 [08] +;---------------------------------------------------------------------------- +; Receiver loop (numbers in brackets are cycles within byte after instr) +;---------------------------------------------------------------------------- +unstuff0: ;- [07] (branch taken) + andi x3, ~0x01 ;1 [08] + mov x1, x2 ;1 [09] x2 contains last sampled (stuffed) bit + in x2, USBIN ;1 [00] [10] <-- sample bit 1 again + andi x2, USBMASK ;1 [01] + breq se0Hop ;1 [02] SE0 check for bit 1 + ori shift, 0x01 ;1 [03] 0b00000001 + nop ;1 [04] + rjmp didUnstuff0 ;2 [05] +;----------------------------------------------------- +unstuff1: ;- [05] (branch taken) + mov x2, x1 ;1 [06] x1 contains last sampled (stuffed) bit + andi x3, ~0x02 ;1 [07] + ori shift, 0x02 ;1 [08] 0b00000010 + nop ;1 [09] + in x1, USBIN ;1 [00] [10] <-- sample bit 2 again + andi x1, USBMASK ;1 [01] + breq se0Hop ;1 [02] SE0 check for bit 2 + rjmp didUnstuff1 ;2 [03] +;----------------------------------------------------- +unstuff2: ;- [05] (branch taken) + andi x3, ~0x04 ;1 [06] + ori shift, 0x04 ;1 [07] 0b00000100 + mov x1, x2 ;1 [08] x2 contains last sampled (stuffed) bit + nop ;1 [09] + in x2, USBIN ;1 [00] [10] <-- sample bit 3 + andi x2, USBMASK ;1 [01] + breq se0Hop ;1 [02] SE0 check for bit 3 + rjmp didUnstuff2 ;2 [03] +;----------------------------------------------------- +unstuff3: ;- [00] [10] (branch taken) + in x2, USBIN ;1 [01] [11] <-- sample stuffed bit 3 one cycle too late + andi x2, USBMASK ;1 [02] + breq se0Hop ;1 [03] SE0 check for stuffed bit 3 + andi x3, ~0x08 ;1 [04] + ori shift, 0x08 ;1 [05] 0b00001000 + rjmp didUnstuff3 ;2 [06] +;---------------------------------------------------------------------------- +; extra jobs done during bit interval: +; +; bit 0: store, clear [SE0 is unreliable here due to bit dribbling in hubs], +; overflow check, jump to the head of rxLoop +; bit 1: SE0 check +; bit 2: SE0 check, recovery from delay [bit 0 tasks took too long] +; bit 3: SE0 check, recovery from delay [bit 0 tasks took too long] +; bit 4: SE0 check, none +; bit 5: SE0 check, none +; bit 6: SE0 check, none +; bit 7: SE0 check, reconstruct: x3 is 0 at bit locations we changed, 1 at others +;---------------------------------------------------------------------------- +rxLoop: ;- [09] + in x2, USBIN ;1 [00] [10] <-- sample bit 1 (or possibly bit 0 stuffed) + andi x2, USBMASK ;1 [01] + brne SkipSe0Hop ;1 [02] +se0Hop: ;- [02] + rjmp se0 ;2 [03] SE0 check for bit 1 +SkipSe0Hop: ;- [03] + ser x3 ;1 [04] + andi shift, 0xf9 ;1 [05] 0b11111001 + breq unstuff0 ;1 [06] +didUnstuff0: ;- [06] + eor x1, x2 ;1 [07] + bst x1, USBMINUS ;1 [08] + bld shift, 1 ;1 [09] + in x1, USBIN ;1 [00] [10] <-- sample bit 2 (or possibly bit 1 stuffed) + andi x1, USBMASK ;1 [01] + breq se0Hop ;1 [02] SE0 check for bit 2 + andi shift, 0xf3 ;1 [03] 0b11110011 + breq unstuff1 ;1 [04] do remaining work for bit 1 +didUnstuff1: ;- [04] + eor x2, x1 ;1 [05] + bst x2, USBMINUS ;1 [06] + bld shift, 2 ;1 [07] + nop2 ;2 [08+09] + in x2, USBIN ;1 [00] [10] <-- sample bit 3 (or possibly bit 2 stuffed) + andi x2, USBMASK ;1 [01] + breq se0Hop ;1 [02] SE0 check for bit 3 + andi shift, 0xe7 ;1 [03] 0b11100111 + breq unstuff2 ;1 [04] +didUnstuff2: ;- [04] + eor x1, x2 ;1 [05] + bst x1, USBMINUS ;1 [06] + bld shift, 3 ;1 [07] +didUnstuff3: ;- [07] + andi shift, 0xcf ;1 [08] 0b11001111 + breq unstuff3 ;1 [09] + in x1, USBIN ;1 [00] [10] <-- sample bit 4 + andi x1, USBMASK ;1 [01] + breq se0Hop ;1 [02] SE0 check for bit 4 + eor x2, x1 ;1 [03] + bst x2, USBMINUS ;1 [04] + bld shift, 4 ;1 [05] +didUnstuff4: ;- [05] + andi shift, 0x9f ;1 [06] 0b10011111 + breq unstuff4 ;1 [07] + nop2 ;2 [08+09] + in x2, USBIN ;1 [00] [10] <-- sample bit 5 + andi x2, USBMASK ;1 [01] + breq se0 ;1 [02] SE0 check for bit 5 + eor x1, x2 ;1 [03] + bst x1, USBMINUS ;1 [04] + bld shift, 5 ;1 [05] +didUnstuff5: ;- [05] + andi shift, 0x3f ;1 [06] 0b00111111 + breq unstuff5 ;1 [07] + nop2 ;2 [08+09] + in x1, USBIN ;1 [00] [10] <-- sample bit 6 + andi x1, USBMASK ;1 [01] + breq se0 ;1 [02] SE0 check for bit 6 + eor x2, x1 ;1 [03] + bst x2, USBMINUS ;1 [04] + bld shift, 6 ;1 [05] +didUnstuff6: ;- [05] + cpi shift, 0x02 ;1 [06] 0b00000010 + brlo unstuff6 ;1 [07] + nop2 ;2 [08+09] + in x2, USBIN ;1 [00] [10] <-- sample bit 7 + andi x2, USBMASK ;1 [01] + breq se0 ;1 [02] SE0 check for bit 7 + eor x1, x2 ;1 [03] + bst x1, USBMINUS ;1 [04] + bld shift, 7 ;1 [05] +didUnstuff7: ;- [05] + cpi shift, 0x04 ;1 [06] 0b00000100 + brlo unstuff7 ;1 [07] + eor x3, shift ;1 [08] reconstruct: x3 is 0 at bit locations we changed, 1 at others + nop ;1 [09] + in x1, USBIN ;1 [00] [10] <-- sample bit 0 + st y+, x3 ;2 [01+02] store data + eor x2, x1 ;1 [03] + bst x2, USBMINUS ;1 [04] + bld shift, 0 ;1 [05] + subi cnt, 1 ;1 [06] + brcs overflow ;1 [07] + rjmp rxLoop ;2 [08] +;----------------------------------------------------- +unstuff4: ;- [08] + andi x3, ~0x10 ;1 [09] + in x1, USBIN ;1 [00] [10] <-- sample stuffed bit 4 + andi x1, USBMASK ;1 [01] + breq se0 ;1 [02] SE0 check for stuffed bit 4 + ori shift, 0x10 ;1 [03] + rjmp didUnstuff4 ;2 [04] +;----------------------------------------------------- +unstuff5: ;- [08] + ori shift, 0x20 ;1 [09] + in x2, USBIN ;1 [00] [10] <-- sample stuffed bit 5 + andi x2, USBMASK ;1 [01] + breq se0 ;1 [02] SE0 check for stuffed bit 5 + andi x3, ~0x20 ;1 [03] + rjmp didUnstuff5 ;2 [04] +;----------------------------------------------------- +unstuff6: ;- [08] + andi x3, ~0x40 ;1 [09] + in x1, USBIN ;1 [00] [10] <-- sample stuffed bit 6 + andi x1, USBMASK ;1 [01] + breq se0 ;1 [02] SE0 check for stuffed bit 6 + ori shift, 0x40 ;1 [03] + rjmp didUnstuff6 ;2 [04] +;----------------------------------------------------- +unstuff7: ;- [08] + andi x3, ~0x80 ;1 [09] + in x2, USBIN ;1 [00] [10] <-- sample stuffed bit 7 + andi x2, USBMASK ;1 [01] + breq se0 ;1 [02] SE0 check for stuffed bit 7 + ori shift, 0x80 ;1 [03] + rjmp didUnstuff7 ;2 [04] + +macro POP_STANDARD ; 16 cycles + pop x4 + pop cnt + pop bitcnt + pop x3 + pop x2 + pop x1 + pop shift + pop YH + endm +macro POP_RETI ; 5 cycles + pop YL + out SREG, YL + pop YL + endm + +#include "asmcommon.inc" + +;--------------------------------------------------------------------------- +; USB spec says: +; idle = J +; J = (D+ = 0), (D- = 1) +; K = (D+ = 1), (D- = 0) +; Spec allows 7.5 bit times from EOP to SOP for replies +;--------------------------------------------------------------------------- +bitstuffN: ;- [04] + eor x1, x4 ;1 [05] + clr x2 ;1 [06] + nop ;1 [07] + rjmp didStuffN ;1 [08] +;--------------------------------------------------------------------------- +bitstuff6: ;- [04] + eor x1, x4 ;1 [05] + clr x2 ;1 [06] + rjmp didStuff6 ;1 [07] +;--------------------------------------------------------------------------- +bitstuff7: ;- [02] + eor x1, x4 ;1 [03] + clr x2 ;1 [06] + nop ;1 [05] + rjmp didStuff7 ;1 [06] +;--------------------------------------------------------------------------- +sendNakAndReti: ;- [-19] + ldi x3, USBPID_NAK ;1 [-18] + rjmp sendX3AndReti ;1 [-17] +;--------------------------------------------------------------------------- +sendAckAndReti: ;- [-17] + ldi cnt, USBPID_ACK ;1 [-16] +sendCntAndReti: ;- [-16] + mov x3, cnt ;1 [-15] +sendX3AndReti: ;- [-15] + ldi YL, 20 ;1 [-14] x3==r20 address is 20 + ldi YH, 0 ;1 [-13] + ldi cnt, 2 ;1 [-12] +; rjmp usbSendAndReti fallthrough +;--------------------------------------------------------------------------- +;usbSend: +;pointer to data in 'Y' +;number of bytes in 'cnt' -- including sync byte [range 2 ... 12] +;uses: x1...x4, btcnt, shift, cnt, Y +;Numbers in brackets are time since first bit of sync pattern is sent +;We need not to match the transfer rate exactly because the spec demands +;only 1.5% precision anyway. +usbSendAndReti: ;- [-13] 13 cycles until SOP + in x2, USBDDR ;1 [-12] + ori x2, USBMASK ;1 [-11] + sbi USBOUT, USBMINUS ;2 [-09-10] prepare idle state; D+ and D- must have been 0 (no pullups) + in x1, USBOUT ;1 [-08] port mirror for tx loop + out USBDDR, x2 ;1 [-07] <- acquire bus + ; need not init x2 (bitstuff history) because sync starts with 0 + ldi x4, USBMASK ;1 [-06] exor mask + ldi shift, 0x80 ;1 [-05] sync byte is first byte sent + ldi bitcnt, 6 ;1 [-04] +txBitLoop: ;- [-04] [06] + sbrs shift, 0 ;1 [-03] [07] + eor x1, x4 ;1 [-02] [08] + ror shift ;1 [-01] [09] +didStuffN: ;- [09] + out USBOUT, x1 ;1 [00] [10] <-- out N + ror x2 ;1 [01] + cpi x2, 0xfc ;1 [02] + brcc bitstuffN ;1 [03] + dec bitcnt ;1 [04] + brne txBitLoop ;1 [05] + sbrs shift, 0 ;1 [06] + eor x1, x4 ;1 [07] + ror shift ;1 [08] +didStuff6: ;- [08] + nop ;1 [09] + out USBOUT, x1 ;1 [00] [10] <-- out 6 + ror x2 ;1 [01] + cpi x2, 0xfc ;1 [02] + brcc bitstuff6 ;1 [03] + sbrs shift, 0 ;1 [04] + eor x1, x4 ;1 [05] + ror shift ;1 [06] + ror x2 ;1 [07] +didStuff7: ;- [07] + ldi bitcnt, 6 ;1 [08] + cpi x2, 0xfc ;1 [09] + out USBOUT, x1 ;1 [00] [10] <-- out 7 + brcc bitstuff7 ;1 [01] + ld shift, y+ ;2 [02+03] + dec cnt ;1 [04] + brne txBitLoop ;1 [05] +makeSE0: + cbr x1, USBMASK ;1 [06] prepare SE0 [spec says EOP may be 19 to 23 cycles] + lds x2, usbNewDeviceAddr;2 [07+08] + lsl x2 ;1 [09] we compare with left shifted address +;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm: +;set address only after data packet was sent, not after handshake + out USBOUT, x1 ;1 [00] [10] <-- out SE0-- from now 2 bits==20 cycl. until bus idle + subi YL, 20 + 2 ;1 [01] Only assign address on data packets, not ACK/NAK in x3 + sbci YH, 0 ;1 [02] + breq skipAddrAssign ;1 [03] + sts usbDeviceAddr, x2 ;2 [04+05] if not skipped: SE0 is one cycle longer +;---------------------------------------------------------------------------- +;end of usbDeviceAddress transfer +skipAddrAssign: ;- [03/04] + ldi x2, 1<<USB_INTR_PENDING_BIT ;1 [05] int0 occurred during TX -- clear pending flag + USB_STORE_PENDING(x2) ;1 [06] + ori x1, USBIDLE ;1 [07] + in x2, USBDDR ;1 [08] + cbr x2, USBMASK ;1 [09] set both pins to input + mov x3, x1 ;1 [10] + cbr x3, USBMASK ;1 [11] configure no pullup on both pins + ldi x4, 3 ;1 [12] +se0Delay: ;- [12] [15] + dec x4 ;1 [13] [16] + brne se0Delay ;1 [14] [17] + nop2 ;2 [18+19] + out USBOUT, x1 ;1 [20] <--out J (idle) -- end of SE0 (EOP sig.) + out USBDDR, x2 ;1 [21] <--release bus now + out USBOUT, x3 ;1 [22] <--ensure no pull-up resistors are active + rjmp doReturn ;1 [23] +;--------------------------------------------------------------------------- diff --git a/usbdrv/usbdrvasm16.inc b/usbdrv/usbdrvasm16.inc new file mode 100644 index 0000000..25b84e6 --- /dev/null +++ b/usbdrv/usbdrvasm16.inc @@ -0,0 +1,345 @@ +/* Name: usbdrvasm16.inc + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2007-06-15 + * Tabsize: 4 + * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* Do not link this file! Link usbdrvasm.S instead, which includes the + * appropriate implementation! + */ + +/* +General Description: +This file is the 16 MHz version of the asssembler part of the USB driver. It +requires a 16 MHz crystal (not a ceramic resonator and not a calibrated RC +oscillator). + +See usbdrv.h for a description of the entire driver. + +Since almost all of this code is timing critical, don't change unless you +really know what you are doing! Many parts require not only a maximum number +of CPU cycles, but even an exact number of cycles! +*/ + +;max stack usage: [ret(2), YL, SREG, YH, bitcnt, shift, x1, x2, x3, x4, cnt] = 12 bytes +;nominal frequency: 16 MHz -> 10.6666666 cycles per bit, 85.333333333 cycles per byte +; Numbers in brackets are clocks counted from center of last sync bit +; when instruction starts + +USB_INTR_VECTOR: +;order of registers pushed: YL, SREG YH, [sofError], bitcnt, shift, x1, x2, x3, x4, cnt + push YL ;[-25] push only what is necessary to sync with edge ASAP + in YL, SREG ;[-23] + push YL ;[-22] + push YH ;[-20] +;---------------------------------------------------------------------------- +; Synchronize with sync pattern: +;---------------------------------------------------------------------------- +;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K] +;sync up with J to K edge during sync pattern -- use fastest possible loops +;The first part waits at most 1 bit long since we must be in sync pattern. +;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to +;waitForJ, ensure that this prerequisite is met. +waitForJ: + inc YL + sbis USBIN, USBMINUS + brne waitForJ ; just make sure we have ANY timeout +waitForK: +;The following code results in a sampling window of < 1/4 bit which meets the spec. + sbis USBIN, USBMINUS ;[-15] + rjmp foundK ;[-14] + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK +#if USB_COUNT_SOF + lds YL, usbSofCount + inc YL + sts usbSofCount, YL +#endif /* USB_COUNT_SOF */ +#ifdef USB_SOF_HOOK + USB_SOF_HOOK +#endif + rjmp sofError +foundK: ;[-12] +;{3, 5} after falling D- edge, average delay: 4 cycles [we want 5 for center sampling] +;we have 1 bit time for setup purposes, then sample again. Numbers in brackets +;are cycles from center of first sync (double K) bit after the instruction + push bitcnt ;[-12] +; [---] ;[-11] + lds YL, usbInputBufOffset;[-10] +; [---] ;[-9] + clr YH ;[-8] + subi YL, lo8(-(usbRxBuf));[-7] [rx loop init] + sbci YH, hi8(-(usbRxBuf));[-6] [rx loop init] + push shift ;[-5] +; [---] ;[-4] + ldi bitcnt, 0x55 ;[-3] [rx loop init] + sbis USBIN, USBMINUS ;[-2] we want two bits K (sample 2 cycles too early) + rjmp haveTwoBitsK ;[-1] + pop shift ;[0] undo the push from before + pop bitcnt ;[2] undo the push from before + rjmp waitForK ;[4] this was not the end of sync, retry +; The entire loop from waitForK until rjmp waitForK above must not exceed two +; bit times (= 21 cycles). + +;---------------------------------------------------------------------------- +; push more registers and initialize values while we sample the first bits: +;---------------------------------------------------------------------------- +haveTwoBitsK: + push x1 ;[1] + push x2 ;[3] + push x3 ;[5] + ldi shift, 0 ;[7] + ldi x3, 1<<4 ;[8] [rx loop init] first sample is inverse bit, compensate that + push x4 ;[9] == leap + + in x1, USBIN ;[11] <-- sample bit 0 + andi x1, USBMASK ;[12] + bst x1, USBMINUS ;[13] + bld shift, 7 ;[14] + push cnt ;[15] + ldi leap, 0 ;[17] [rx loop init] + ldi cnt, USB_BUFSIZE;[18] [rx loop init] + rjmp rxbit1 ;[19] arrives at [21] + +;---------------------------------------------------------------------------- +; Receiver loop (numbers in brackets are cycles within byte after instr) +;---------------------------------------------------------------------------- + +; duration of unstuffing code should be 10.66666667 cycles. We adjust "leap" +; accordingly to approximate this value in the long run. + +unstuff6: + andi x2, USBMASK ;[03] + ori x3, 1<<6 ;[04] will not be shifted any more + andi shift, ~0x80;[05] + mov x1, x2 ;[06] sampled bit 7 is actually re-sampled bit 6 + subi leap, -1 ;[07] total duration = 11 bits -> subtract 1/3 + rjmp didUnstuff6 ;[08] + +unstuff7: + ori x3, 1<<7 ;[09] will not be shifted any more + in x2, USBIN ;[00] [10] re-sample bit 7 + andi x2, USBMASK ;[01] + andi shift, ~0x80;[02] + subi leap, 2 ;[03] total duration = 10 bits -> add 1/3 + rjmp didUnstuff7 ;[04] + +unstuffEven: + ori x3, 1<<6 ;[09] will be shifted right 6 times for bit 0 + in x1, USBIN ;[00] [10] + andi shift, ~0x80;[01] + andi x1, USBMASK ;[02] + breq se0 ;[03] + subi leap, -1 ;[04] total duration = 11 bits -> subtract 1/3 + nop2 ;[05] + rjmp didUnstuffE ;[06] + +unstuffOdd: + ori x3, 1<<5 ;[09] will be shifted right 4 times for bit 1 + in x2, USBIN ;[00] [10] + andi shift, ~0x80;[01] + andi x2, USBMASK ;[02] + breq se0 ;[03] + subi leap, -1 ;[04] total duration = 11 bits -> subtract 1/3 + nop2 ;[05] + rjmp didUnstuffO ;[06] + +rxByteLoop: + andi x1, USBMASK ;[03] + eor x2, x1 ;[04] + subi leap, 1 ;[05] + brpl skipLeap ;[06] + subi leap, -3 ;1 one leap cycle every 3rd byte -> 85 + 1/3 cycles per byte + nop ;1 +skipLeap: + subi x2, 1 ;[08] + ror shift ;[09] +didUnstuff6: + cpi shift, 0xfc ;[10] + in x2, USBIN ;[00] [11] <-- sample bit 7 + brcc unstuff6 ;[01] + andi x2, USBMASK ;[02] + eor x1, x2 ;[03] + subi x1, 1 ;[04] + ror shift ;[05] +didUnstuff7: + cpi shift, 0xfc ;[06] + brcc unstuff7 ;[07] + eor x3, shift ;[08] reconstruct: x3 is 1 at bit locations we changed, 0 at others + st y+, x3 ;[09] store data +rxBitLoop: + in x1, USBIN ;[00] [11] <-- sample bit 0/2/4 + andi x1, USBMASK ;[01] + eor x2, x1 ;[02] + andi x3, 0x3f ;[03] topmost two bits reserved for 6 and 7 + subi x2, 1 ;[04] + ror shift ;[05] + cpi shift, 0xfc ;[06] + brcc unstuffEven ;[07] +didUnstuffE: + lsr x3 ;[08] + lsr x3 ;[09] +rxbit1: + in x2, USBIN ;[00] [10] <-- sample bit 1/3/5 + andi x2, USBMASK ;[01] + breq se0 ;[02] + eor x1, x2 ;[03] + subi x1, 1 ;[04] + ror shift ;[05] + cpi shift, 0xfc ;[06] + brcc unstuffOdd ;[07] +didUnstuffO: + subi bitcnt, 0xab;[08] == addi 0x55, 0x55 = 0x100/3 + brcs rxBitLoop ;[09] + + subi cnt, 1 ;[10] + in x1, USBIN ;[00] [11] <-- sample bit 6 + brcc rxByteLoop ;[01] + rjmp overflow + +macro POP_STANDARD ; 14 cycles + pop cnt + pop x4 + pop x3 + pop x2 + pop x1 + pop shift + pop bitcnt + endm +macro POP_RETI ; 7 cycles + pop YH + pop YL + out SREG, YL + pop YL + endm + +#include "asmcommon.inc" + +; USB spec says: +; idle = J +; J = (D+ = 0), (D- = 1) +; K = (D+ = 1), (D- = 0) +; Spec allows 7.5 bit times from EOP to SOP for replies + +bitstuffN: + eor x1, x4 ;[5] + ldi x2, 0 ;[6] + nop2 ;[7] + nop ;[9] + out USBOUT, x1 ;[10] <-- out + rjmp didStuffN ;[0] + +bitstuff6: + eor x1, x4 ;[5] + ldi x2, 0 ;[6] Carry is zero due to brcc + rol shift ;[7] compensate for ror shift at branch destination + rjmp didStuff6 ;[8] + +bitstuff7: + ldi x2, 0 ;[2] Carry is zero due to brcc + rjmp didStuff7 ;[3] + + +sendNakAndReti: + ldi x3, USBPID_NAK ;[-18] + rjmp sendX3AndReti ;[-17] +sendAckAndReti: + ldi cnt, USBPID_ACK ;[-17] +sendCntAndReti: + mov x3, cnt ;[-16] +sendX3AndReti: + ldi YL, 20 ;[-15] x3==r20 address is 20 + ldi YH, 0 ;[-14] + ldi cnt, 2 ;[-13] +; rjmp usbSendAndReti fallthrough + +;usbSend: +;pointer to data in 'Y' +;number of bytes in 'cnt' -- including sync byte [range 2 ... 12] +;uses: x1...x4, btcnt, shift, cnt, Y +;Numbers in brackets are time since first bit of sync pattern is sent +;We don't match the transfer rate exactly (don't insert leap cycles every third +;byte) because the spec demands only 1.5% precision anyway. +usbSendAndReti: ; 12 cycles until SOP + in x2, USBDDR ;[-12] + ori x2, USBMASK ;[-11] + sbi USBOUT, USBMINUS;[-10] prepare idle state; D+ and D- must have been 0 (no pullups) + in x1, USBOUT ;[-8] port mirror for tx loop + out USBDDR, x2 ;[-7] <- acquire bus +; need not init x2 (bitstuff history) because sync starts with 0 + ldi x4, USBMASK ;[-6] exor mask + ldi shift, 0x80 ;[-5] sync byte is first byte sent +txByteLoop: + ldi bitcnt, 0x35 ;[-4] [6] binary 0011 0101 +txBitLoop: + sbrs shift, 0 ;[-3] [7] + eor x1, x4 ;[-2] [8] + out USBOUT, x1 ;[-1] [9] <-- out N + ror shift ;[0] [10] + ror x2 ;[1] +didStuffN: + cpi x2, 0xfc ;[2] + brcc bitstuffN ;[3] + lsr bitcnt ;[4] + brcc txBitLoop ;[5] + brne txBitLoop ;[6] + + sbrs shift, 0 ;[7] + eor x1, x4 ;[8] +didStuff6: + out USBOUT, x1 ;[-1] [9] <-- out 6 + ror shift ;[0] [10] + ror x2 ;[1] + cpi x2, 0xfc ;[2] + brcc bitstuff6 ;[3] + ror shift ;[4] +didStuff7: + ror x2 ;[5] + sbrs x2, 7 ;[6] + eor x1, x4 ;[7] + nop ;[8] + cpi x2, 0xfc ;[9] + out USBOUT, x1 ;[-1][10] <-- out 7 + brcc bitstuff7 ;[0] [11] + ld shift, y+ ;[1] + dec cnt ;[3] + brne txByteLoop ;[4] +;make SE0: + cbr x1, USBMASK ;[5] prepare SE0 [spec says EOP may be 21 to 25 cycles] + lds x2, usbNewDeviceAddr;[6] + lsl x2 ;[8] we compare with left shifted address + subi YL, 20 + 2 ;[9] Only assign address on data packets, not ACK/NAK in x3 + sbci YH, 0 ;[10] + out USBOUT, x1 ;[11] <-- out SE0 -- from now 2 bits = 22 cycles until bus idle +;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm: +;set address only after data packet was sent, not after handshake + breq skipAddrAssign ;[0] + sts usbDeviceAddr, x2; if not skipped: SE0 is one cycle longer +skipAddrAssign: +;end of usbDeviceAddress transfer + ldi x2, 1<<USB_INTR_PENDING_BIT;[2] int0 occurred during TX -- clear pending flag + USB_STORE_PENDING(x2) ;[3] + ori x1, USBIDLE ;[4] + in x2, USBDDR ;[5] + cbr x2, USBMASK ;[6] set both pins to input + mov x3, x1 ;[7] + cbr x3, USBMASK ;[8] configure no pullup on both pins + ldi x4, 4 ;[9] +se0Delay: + dec x4 ;[10] [13] [16] [19] + brne se0Delay ;[11] [14] [17] [20] + out USBOUT, x1 ;[21] <-- out J (idle) -- end of SE0 (EOP signal) + out USBDDR, x2 ;[22] <-- release bus now + out USBOUT, x3 ;[23] <-- ensure no pull-up resistors are active + rjmp doReturn diff --git a/usbdrv/usbdrvasm165.inc b/usbdrv/usbdrvasm165.inc new file mode 100644 index 0000000..ae91588 --- /dev/null +++ b/usbdrv/usbdrvasm165.inc @@ -0,0 +1,452 @@ +/* Name: usbdrvasm165.inc + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2007-04-22 + * Tabsize: 4 + * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* Do not link this file! Link usbdrvasm.S instead, which includes the + * appropriate implementation! + */ + +/* +General Description: +This file is the 16.5 MHz version of the USB driver. It is intended for the +ATTiny45 and similar controllers running on 16.5 MHz internal RC oscillator. +This version contains a phase locked loop in the receiver routine to cope with +slight clock rate deviations of up to +/- 1%. + +See usbdrv.h for a description of the entire driver. + +Since almost all of this code is timing critical, don't change unless you +really know what you are doing! Many parts require not only a maximum number +of CPU cycles, but even an exact number of cycles! +*/ + +;Software-receiver engine. Strict timing! Don't change unless you can preserve timing! +;interrupt response time: 4 cycles + insn running = 7 max if interrupts always enabled +;max allowable interrupt latency: 59 cycles -> max 52 cycles interrupt disable +;max stack usage: [ret(2), r0, SREG, YL, YH, shift, x1, x2, x3, x4, cnt] = 12 bytes +;nominal frequency: 16.5 MHz -> 11 cycles per bit +; 16.3125 MHz < F_CPU < 16.6875 MHz (+/- 1.1%) +; Numbers in brackets are clocks counted from center of last sync bit +; when instruction starts + + +USB_INTR_VECTOR: +;order of registers pushed: YL, SREG [sofError], r0, YH, shift, x1, x2, x3, x4, cnt + push YL ;[-23] push only what is necessary to sync with edge ASAP + in YL, SREG ;[-21] + push YL ;[-20] +;---------------------------------------------------------------------------- +; Synchronize with sync pattern: +;---------------------------------------------------------------------------- +;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K] +;sync up with J to K edge during sync pattern -- use fastest possible loops +;The first part waits at most 1 bit long since we must be in sync pattern. +;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to +;waitForJ, ensure that this prerequisite is met. +waitForJ: + inc YL + sbis USBIN, USBMINUS + brne waitForJ ; just make sure we have ANY timeout +waitForK: +;The following code results in a sampling window of < 1/4 bit which meets the spec. + sbis USBIN, USBMINUS ;[-15] + rjmp foundK ;[-14] + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK +#if USB_COUNT_SOF + lds YL, usbSofCount + inc YL + sts usbSofCount, YL +#endif /* USB_COUNT_SOF */ +#ifdef USB_SOF_HOOK + USB_SOF_HOOK +#endif + rjmp sofError +foundK: ;[-12] +;{3, 5} after falling D- edge, average delay: 4 cycles [we want 5 for center sampling] +;we have 1 bit time for setup purposes, then sample again. Numbers in brackets +;are cycles from center of first sync (double K) bit after the instruction + push r0 ;[-12] +; [---] ;[-11] + push YH ;[-10] +; [---] ;[-9] + lds YL, usbInputBufOffset;[-8] +; [---] ;[-7] + clr YH ;[-6] + subi YL, lo8(-(usbRxBuf));[-5] [rx loop init] + sbci YH, hi8(-(usbRxBuf));[-4] [rx loop init] + mov r0, x2 ;[-3] [rx loop init] + sbis USBIN, USBMINUS ;[-2] we want two bits K (sample 2 cycles too early) + rjmp haveTwoBitsK ;[-1] + pop YH ;[0] undo the pushes from before + pop r0 ;[2] + rjmp waitForK ;[4] this was not the end of sync, retry +; The entire loop from waitForK until rjmp waitForK above must not exceed two +; bit times (= 22 cycles). + +;---------------------------------------------------------------------------- +; push more registers and initialize values while we sample the first bits: +;---------------------------------------------------------------------------- +haveTwoBitsK: ;[1] + push shift ;[1] + push x1 ;[3] + push x2 ;[5] + push x3 ;[7] + ldi shift, 0xff ;[9] [rx loop init] + ori x3, 0xff ;[10] [rx loop init] == ser x3, clear zero flag + + in x1, USBIN ;[11] <-- sample bit 0 + bst x1, USBMINUS ;[12] + bld shift, 0 ;[13] + push x4 ;[14] == phase +; [---] ;[15] + push cnt ;[16] +; [---] ;[17] + ldi phase, 0 ;[18] [rx loop init] + ldi cnt, USB_BUFSIZE;[19] [rx loop init] + rjmp rxbit1 ;[20] +; [---] ;[21] + +;---------------------------------------------------------------------------- +; Receiver loop (numbers in brackets are cycles within byte after instr) +;---------------------------------------------------------------------------- +/* +byte oriented operations done during loop: +bit 0: store data +bit 1: SE0 check +bit 2: overflow check +bit 3: catch up +bit 4: rjmp to achieve conditional jump range +bit 5: PLL +bit 6: catch up +bit 7: jump, fixup bitstuff +; 87 [+ 2] cycles +------------------------------------------------------------------ +*/ +continueWithBit5: + in x2, USBIN ;[055] <-- bit 5 + eor r0, x2 ;[056] + or phase, r0 ;[057] + sbrc phase, USBMINUS ;[058] + lpm ;[059] optional nop3; modifies r0 + in phase, USBIN ;[060] <-- phase + eor x1, x2 ;[061] + bst x1, USBMINUS ;[062] + bld shift, 5 ;[063] + andi shift, 0x3f ;[064] + in x1, USBIN ;[065] <-- bit 6 + breq unstuff5 ;[066] *** unstuff escape + eor phase, x1 ;[067] + eor x2, x1 ;[068] + bst x2, USBMINUS ;[069] + bld shift, 6 ;[070] +didUnstuff6: ;[ ] + in r0, USBIN ;[071] <-- phase + cpi shift, 0x02 ;[072] + brlo unstuff6 ;[073] *** unstuff escape +didUnstuff5: ;[ ] + nop2 ;[074] +; [---] ;[075] + in x2, USBIN ;[076] <-- bit 7 + eor x1, x2 ;[077] + bst x1, USBMINUS ;[078] + bld shift, 7 ;[079] +didUnstuff7: ;[ ] + eor r0, x2 ;[080] + or phase, r0 ;[081] + in r0, USBIN ;[082] <-- phase + cpi shift, 0x04 ;[083] + brsh rxLoop ;[084] +; [---] ;[085] +unstuff7: ;[ ] + andi x3, ~0x80 ;[085] + ori shift, 0x80 ;[086] + in x2, USBIN ;[087] <-- sample stuffed bit 7 + nop ;[088] + rjmp didUnstuff7 ;[089] +; [---] ;[090] + ;[080] + +unstuff5: ;[067] + eor phase, x1 ;[068] + andi x3, ~0x20 ;[069] + ori shift, 0x20 ;[070] + in r0, USBIN ;[071] <-- phase + mov x2, x1 ;[072] + nop ;[073] + nop2 ;[074] +; [---] ;[075] + in x1, USBIN ;[076] <-- bit 6 + eor r0, x1 ;[077] + or phase, r0 ;[078] + eor x2, x1 ;[079] + bst x2, USBMINUS ;[080] + bld shift, 6 ;[081] no need to check bitstuffing, we just had one + in r0, USBIN ;[082] <-- phase + rjmp didUnstuff5 ;[083] +; [---] ;[084] + ;[074] + +unstuff6: ;[074] + andi x3, ~0x40 ;[075] + in x1, USBIN ;[076] <-- bit 6 again + ori shift, 0x40 ;[077] + nop2 ;[078] +; [---] ;[079] + rjmp didUnstuff6 ;[080] +; [---] ;[081] + ;[071] + +unstuff0: ;[013] + eor r0, x2 ;[014] + or phase, r0 ;[015] + andi x2, USBMASK ;[016] check for SE0 + in r0, USBIN ;[017] <-- phase + breq didUnstuff0 ;[018] direct jump to se0 would be too long + andi x3, ~0x01 ;[019] + ori shift, 0x01 ;[020] + mov x1, x2 ;[021] mov existing sample + in x2, USBIN ;[022] <-- bit 1 again + rjmp didUnstuff0 ;[023] +; [---] ;[024] + ;[014] + +unstuff1: ;[024] + eor r0, x1 ;[025] + or phase, r0 ;[026] + andi x3, ~0x02 ;[027] + in r0, USBIN ;[028] <-- phase + ori shift, 0x02 ;[029] + mov x2, x1 ;[030] + rjmp didUnstuff1 ;[031] +; [---] ;[032] + ;[022] + +unstuff2: ;[035] + eor r0, x2 ;[036] + or phase, r0 ;[037] + andi x3, ~0x04 ;[038] + in r0, USBIN ;[039] <-- phase + ori shift, 0x04 ;[040] + mov x1, x2 ;[041] + rjmp didUnstuff2 ;[042] +; [---] ;[043] + ;[033] + +unstuff3: ;[043] + in x2, USBIN ;[044] <-- bit 3 again + eor r0, x2 ;[045] + or phase, r0 ;[046] + andi x3, ~0x08 ;[047] + ori shift, 0x08 ;[048] + nop ;[049] + in r0, USBIN ;[050] <-- phase + rjmp didUnstuff3 ;[051] +; [---] ;[052] + ;[042] + +unstuff4: ;[053] + andi x3, ~0x10 ;[054] + in x1, USBIN ;[055] <-- bit 4 again + ori shift, 0x10 ;[056] + rjmp didUnstuff4 ;[057] +; [---] ;[058] + ;[048] + +rxLoop: ;[085] + eor x3, shift ;[086] reconstruct: x3 is 0 at bit locations we changed, 1 at others + in x1, USBIN ;[000] <-- bit 0 + st y+, x3 ;[001] +; [---] ;[002] + eor r0, x1 ;[003] + or phase, r0 ;[004] + eor x2, x1 ;[005] + in r0, USBIN ;[006] <-- phase + ser x3 ;[007] + bst x2, USBMINUS ;[008] + bld shift, 0 ;[009] + andi shift, 0xf9 ;[010] +rxbit1: ;[ ] + in x2, USBIN ;[011] <-- bit 1 + breq unstuff0 ;[012] *** unstuff escape + andi x2, USBMASK ;[013] SE0 check for bit 1 +didUnstuff0: ;[ ] Z only set if we detected SE0 in bitstuff + breq se0 ;[014] + eor r0, x2 ;[015] + or phase, r0 ;[016] + in r0, USBIN ;[017] <-- phase + eor x1, x2 ;[018] + bst x1, USBMINUS ;[019] + bld shift, 1 ;[020] + andi shift, 0xf3 ;[021] +didUnstuff1: ;[ ] + in x1, USBIN ;[022] <-- bit 2 + breq unstuff1 ;[023] *** unstuff escape + eor r0, x1 ;[024] + or phase, r0 ;[025] + subi cnt, 1 ;[026] overflow check + brcs overflow ;[027] + in r0, USBIN ;[028] <-- phase + eor x2, x1 ;[029] + bst x2, USBMINUS ;[030] + bld shift, 2 ;[031] + andi shift, 0xe7 ;[032] +didUnstuff2: ;[ ] + in x2, USBIN ;[033] <-- bit 3 + breq unstuff2 ;[034] *** unstuff escape + eor r0, x2 ;[035] + or phase, r0 ;[036] + eor x1, x2 ;[037] + bst x1, USBMINUS ;[038] + in r0, USBIN ;[039] <-- phase + bld shift, 3 ;[040] + andi shift, 0xcf ;[041] +didUnstuff3: ;[ ] + breq unstuff3 ;[042] *** unstuff escape + nop ;[043] + in x1, USBIN ;[044] <-- bit 4 + eor x2, x1 ;[045] + bst x2, USBMINUS ;[046] + bld shift, 4 ;[047] +didUnstuff4: ;[ ] + eor r0, x1 ;[048] + or phase, r0 ;[049] + in r0, USBIN ;[050] <-- phase + andi shift, 0x9f ;[051] + breq unstuff4 ;[052] *** unstuff escape + rjmp continueWithBit5;[053] +; [---] ;[054] + +macro POP_STANDARD ; 16 cycles + pop cnt + pop x4 + pop x3 + pop x2 + pop x1 + pop shift + pop YH + pop r0 + endm +macro POP_RETI ; 5 cycles + pop YL + out SREG, YL + pop YL + endm + +#include "asmcommon.inc" + + +; USB spec says: +; idle = J +; J = (D+ = 0), (D- = 1) +; K = (D+ = 1), (D- = 0) +; Spec allows 7.5 bit times from EOP to SOP for replies + +bitstuff7: + eor x1, x4 ;[4] + ldi x2, 0 ;[5] + nop2 ;[6] C is zero (brcc) + rjmp didStuff7 ;[8] + +bitstuffN: + eor x1, x4 ;[5] + ldi x2, 0 ;[6] + lpm ;[7] 3 cycle NOP, modifies r0 + out USBOUT, x1 ;[10] <-- out + rjmp didStuffN ;[0] + +#define bitStatus x3 + +sendNakAndReti: + ldi cnt, USBPID_NAK ;[-19] + rjmp sendCntAndReti ;[-18] +sendAckAndReti: + ldi cnt, USBPID_ACK ;[-17] +sendCntAndReti: + mov r0, cnt ;[-16] + ldi YL, 0 ;[-15] R0 address is 0 + ldi YH, 0 ;[-14] + ldi cnt, 2 ;[-13] +; rjmp usbSendAndReti fallthrough + +;usbSend: +;pointer to data in 'Y' +;number of bytes in 'cnt' -- including sync byte [range 2 ... 12] +;uses: x1...x4, shift, cnt, Y +;Numbers in brackets are time since first bit of sync pattern is sent +usbSendAndReti: ; 12 cycles until SOP + in x2, USBDDR ;[-12] + ori x2, USBMASK ;[-11] + sbi USBOUT, USBMINUS;[-10] prepare idle state; D+ and D- must have been 0 (no pullups) + in x1, USBOUT ;[-8] port mirror for tx loop + out USBDDR, x2 ;[-7] <- acquire bus +; need not init x2 (bitstuff history) because sync starts with 0 + ldi x4, USBMASK ;[-6] exor mask + ldi shift, 0x80 ;[-5] sync byte is first byte sent + ldi bitStatus, 0xff ;[-4] init bit loop counter, works for up to 12 bytes +byteloop: +bitloop: + sbrs shift, 0 ;[8] [-3] + eor x1, x4 ;[9] [-2] + out USBOUT, x1 ;[10] [-1] <-- out + ror shift ;[0] + ror x2 ;[1] +didStuffN: + cpi x2, 0xfc ;[2] + brcc bitstuffN ;[3] + nop ;[4] + subi bitStatus, 37 ;[5] 256 / 7 ~=~ 37 + brcc bitloop ;[6] when we leave the loop, bitStatus has almost the initial value + sbrs shift, 0 ;[7] + eor x1, x4 ;[8] + ror shift ;[9] +didStuff7: + out USBOUT, x1 ;[10] <-- out + ror x2 ;[0] + cpi x2, 0xfc ;[1] + brcc bitstuff7 ;[2] + ld shift, y+ ;[3] + dec cnt ;[5] + brne byteloop ;[6] +;make SE0: + cbr x1, USBMASK ;[7] prepare SE0 [spec says EOP may be 21 to 25 cycles] + lds x2, usbNewDeviceAddr;[8] + lsl x2 ;[10] we compare with left shifted address + out USBOUT, x1 ;[11] <-- out SE0 -- from now 2 bits = 22 cycles until bus idle +;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm: +;set address only after data packet was sent, not after handshake + subi YL, 2 ;[0] Only assign address on data packets, not ACK/NAK in r0 + sbci YH, 0 ;[1] + breq skipAddrAssign ;[2] + sts usbDeviceAddr, x2; if not skipped: SE0 is one cycle longer +skipAddrAssign: +;end of usbDeviceAddress transfer + ldi x2, 1<<USB_INTR_PENDING_BIT;[4] int0 occurred during TX -- clear pending flag + USB_STORE_PENDING(x2) ;[5] + ori x1, USBIDLE ;[6] + in x2, USBDDR ;[7] + cbr x2, USBMASK ;[8] set both pins to input + mov x3, x1 ;[9] + cbr x3, USBMASK ;[10] configure no pullup on both pins + ldi x4, 4 ;[11] +se0Delay: + dec x4 ;[12] [15] [18] [21] + brne se0Delay ;[13] [16] [19] [22] + out USBOUT, x1 ;[23] <-- out J (idle) -- end of SE0 (EOP signal) + out USBDDR, x2 ;[24] <-- release bus now + out USBOUT, x3 ;[25] <-- ensure no pull-up resistors are active + rjmp doReturn + diff --git a/usbdrv/usbdrvasm18-crc.inc b/usbdrv/usbdrvasm18-crc.inc new file mode 100644 index 0000000..0ff2f42 --- /dev/null +++ b/usbdrv/usbdrvasm18-crc.inc @@ -0,0 +1,706 @@ +/* Name: usbdrvasm18.inc + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Lukas Schrittwieser (based on 20 MHz usbdrvasm20.inc by Jeroen Benschop) + * Creation Date: 2009-01-20 + * Tabsize: 4 + * Copyright: (c) 2008 by Lukas Schrittwieser and OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* Do not link this file! Link usbdrvasm.S instead, which includes the + * appropriate implementation! + */ + +/* +General Description: +This file is the 18 MHz version of the asssembler part of the USB driver. It +requires a 18 MHz crystal (not a ceramic resonator and not a calibrated RC +oscillator). + +See usbdrv.h for a description of the entire driver. + +Since almost all of this code is timing critical, don't change unless you +really know what you are doing! Many parts require not only a maximum number +of CPU cycles, but even an exact number of cycles! +*/ + + +;max stack usage: [ret(2), YL, SREG, YH, [sofError], bitcnt(x5), shift, x1, x2, x3, x4, cnt, ZL, ZH] = 14 bytes +;nominal frequency: 18 MHz -> 12 cycles per bit +; Numbers in brackets are clocks counted from center of last sync bit +; when instruction starts +;register use in receive loop to receive the data bytes: +; shift assembles the byte currently being received +; x1 holds the D+ and D- line state +; x2 holds the previous line state +; cnt holds the number of bytes left in the receive buffer +; x3 holds the higher crc byte (see algorithm below) +; x4 is used as temporary register for the crc algorithm +; x5 is used for unstuffing: when unstuffing the last received bit is inverted in shift (to prevent further +; unstuffing calls. In the same time the corresponding bit in x5 is cleared to mark the bit as beening iverted +; zl lower crc value and crc table index +; zh used for crc table accesses + +;-------------------------------------------------------------------------------------------------------------- +; CRC mods: +; table driven crc checker, Z points to table in prog space +; ZL is the lower crc byte, x3 is the higher crc byte +; x4 is used as temp register to store different results +; the initialization of the crc register is not 0xFFFF but 0xFE54. This is because during the receipt of the +; first data byte an virtual zero data byte is added to the crc register, this results in the correct initial +; value of 0xFFFF at beginning of the second data byte before the first data byte is added to the crc. +; The magic number 0xFE54 results form the crc table: At tabH[0x54] = 0xFF = crcH (required) and +; tabL[0x54] = 0x01 -> crcL = 0x01 xor 0xFE = 0xFF +; bitcnt is renamed to x5 and is used for unstuffing purposes, the unstuffing works like in the 12MHz version +;-------------------------------------------------------------------------------------------------------------- +; CRC algorithm: +; The crc register is formed by x3 (higher byte) and ZL (lower byte). The algorithm uses a 'reversed' form +; i.e. that it takes the least significant bit first and shifts to the right. So in fact the highest order +; bit seen from the polynomial devision point of view is the lsb of ZL. (If this sounds strange to you i +; propose a research on CRC :-) ) +; Each data byte received is xored to ZL, the lower crc byte. This byte now builds the crc +; table index. Next the new high byte is loaded from the table and stored in x4 until we have space in x3 +; (its destination). +; Afterwards the lower table is loaded from the table and stored in ZL (the old index is overwritten as +; we don't need it anymore. In fact this is a right shift by 8 bits.) Now the old crc high value is xored +; to ZL, this is the second shift of the old crc value. Now x4 (the temp reg) is moved to x3 and the crc +; calculation is done. +; Prior to the first byte the two CRC register have to be initialized to 0xFFFF (as defined in usb spec) +; however the crc engine also runs during the receipt of the first byte, therefore x3 and zl are initialized +; to a magic number which results in a crc value of 0xFFFF after the first complete byte. +; +; This algorithm is split into the extra cycles of the different bits: +; bit7: XOR the received byte to ZL +; bit5: load the new high byte to x4 +; bit6: load the lower xor byte from the table, xor zl and x3, store result in zl (=the new crc low value) +; move x4 (the new high byte) to x3, the crc value is ready +; + + +macro POP_STANDARD ; 18 cycles + pop ZH + pop ZL + pop cnt + pop x5 + pop x3 + pop x2 + pop x1 + pop shift + pop x4 + endm +macro POP_RETI ; 7 cycles + pop YH + pop YL + out SREG, YL + pop YL + endm + +macro CRC_CLEANUP_AND_CHECK + ; the last byte has already been xored with the lower crc byte, we have to do the table lookup and xor + ; x3 is the higher crc byte, zl the lower one + ldi ZH, hi8(usbCrcTableHigh);[+1] get the new high byte from the table + lpm x2, Z ;[+2][+3][+4] + ldi ZH, hi8(usbCrcTableLow);[+5] get the new low xor byte from the table + lpm ZL, Z ;[+6][+7][+8] + eor ZL, x3 ;[+7] xor the old high byte with the value from the table, x2:ZL now holds the crc value + cpi ZL, 0x01 ;[+8] if the crc is ok we have a fixed remainder value of 0xb001 in x2:ZL (see usb spec) + brne ignorePacket ;[+9] detected a crc fault -> paket is ignored and retransmitted by the host + cpi x2, 0xb0 ;[+10] + brne ignorePacket ;[+11] detected a crc fault -> paket is ignored and retransmitted by the host + endm + + +USB_INTR_VECTOR: +;order of registers pushed: YL, SREG, YH, [sofError], x4, shift, x1, x2, x3, x5, cnt, ZL, ZH + push YL ;[-28] push only what is necessary to sync with edge ASAP + in YL, SREG ;[-26] + push YL ;[-25] + push YH ;[-23] +;---------------------------------------------------------------------------- +; Synchronize with sync pattern: +;---------------------------------------------------------------------------- +;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K] +;sync up with J to K edge during sync pattern -- use fastest possible loops +;The first part waits at most 1 bit long since we must be in sync pattern. +;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to +;waitForJ, ensure that this prerequisite is met. +waitForJ: + inc YL + sbis USBIN, USBMINUS + brne waitForJ ; just make sure we have ANY timeout +waitForK: +;The following code results in a sampling window of < 1/4 bit which meets the spec. + sbis USBIN, USBMINUS ;[-17] + rjmp foundK ;[-16] + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK +#if USB_COUNT_SOF + lds YL, usbSofCount + inc YL + sts usbSofCount, YL +#endif /* USB_COUNT_SOF */ +#ifdef USB_SOF_HOOK + USB_SOF_HOOK +#endif + rjmp sofError +foundK: ;[-15] +;{3, 5} after falling D- edge, average delay: 4 cycles +;bit0 should be at 30 (2.5 bits) for center sampling. Currently at 4 so 26 cylces till bit 0 sample +;use 1 bit time for setup purposes, then sample again. Numbers in brackets +;are cycles from center of first sync (double K) bit after the instruction + push x4 ;[-14] +; [---] ;[-13] + lds YL, usbInputBufOffset;[-12] used to toggle the two usb receive buffers +; [---] ;[-11] + clr YH ;[-10] + subi YL, lo8(-(usbRxBuf));[-9] [rx loop init] + sbci YH, hi8(-(usbRxBuf));[-8] [rx loop init] + push shift ;[-7] +; [---] ;[-6] + ldi shift, 0x80 ;[-5] the last bit is the end of byte marker for the pid receiver loop + clc ;[-4] the carry has to be clear for receipt of pid bit 0 + sbis USBIN, USBMINUS ;[-3] we want two bits K (sample 3 cycles too early) + rjmp haveTwoBitsK ;[-2] + pop shift ;[-1] undo the push from before + pop x4 ;[1] + rjmp waitForK ;[3] this was not the end of sync, retry +; The entire loop from waitForK until rjmp waitForK above must not exceed two +; bit times (= 24 cycles). + +;---------------------------------------------------------------------------- +; push more registers and initialize values while we sample the first bits: +;---------------------------------------------------------------------------- +haveTwoBitsK: + push x1 ;[0] + push x2 ;[2] + push x3 ;[4] crc high byte + ldi x2, 1<<USBPLUS ;[6] [rx loop init] current line state is K state. D+=="1", D-=="0" + push x5 ;[7] + push cnt ;[9] + ldi cnt, USB_BUFSIZE ;[11] + + +;-------------------------------------------------------------------------------------------------------------- +; receives the pid byte +; there is no real unstuffing algorithm implemented here as a stuffing bit is impossible in the pid byte. +; That's because the last four bits of the byte are the inverted of the first four bits. If we detect a +; unstuffing condition something went wrong and abort +; shift has to be initialized to 0x80 +;-------------------------------------------------------------------------------------------------------------- + +; pid bit 0 - used for even more register saving (we need the z pointer) + in x1, USBIN ;[0] sample line state + andi x1, USBMASK ;[1] filter only D+ and D- bits + eor x2, x1 ;[2] generate inverted of actual bit + sbrc x2, USBMINUS ;[3] if the bit is set we received a zero + sec ;[4] + ror shift ;[5] we perform no unstuffing check here as this is the first bit + mov x2, x1 ;[6] + push ZL ;[7] + ;[8] + push ZH ;[9] + ;[10] + ldi x3, 0xFE ;[11] x3 is the high order crc value + + +bitloopPid: + in x1, USBIN ;[0] sample line state + andi x1, USBMASK ;[1] filter only D+ and D- bits + breq nse0 ;[2] both lines are low so handle se0 + eor x2, x1 ;[3] generate inverted of actual bit + sbrc x2, USBMINUS ;[4] set the carry if we received a zero + sec ;[5] + ror shift ;[6] + ldi ZL, 0x54 ;[7] ZL is the low order crc value + ser x4 ;[8] the is no bit stuffing check here as the pid bit can't be stuffed. if so + ; some error occured. In this case the paket is discarded later on anyway. + mov x2, x1 ;[9] prepare for the next cycle + brcc bitloopPid ;[10] while 0s drop out of shift we get the next bit + eor x4, shift ;[11] invert all bits in shift and store result in x4 + +;-------------------------------------------------------------------------------------------------------------- +; receives data bytes and calculates the crc +; the last USBIN state has to be in x2 +; this is only the first half, due to branch distanc limitations the second half of the loop is near the end +; of this asm file +;-------------------------------------------------------------------------------------------------------------- + +rxDataStart: + in x1, USBIN ;[0] sample line state (note: a se0 check is not useful due to bit dribbling) + ser x5 ;[1] prepare the unstuff marker register + eor x2, x1 ;[2] generates the inverted of the actual bit + bst x2, USBMINUS ;[3] copy the bit from x2 + bld shift, 0 ;[4] and store it in shift + mov x2, shift ;[5] make a copy of shift for unstuffing check + andi x2, 0xF9 ;[6] mask the last six bits, if we got six zeros (which are six ones in fact) + breq unstuff0 ;[7] then Z is set now and we branch to the unstuffing handler +didunstuff0: + subi cnt, 1 ;[8] cannot use dec because it doesn't affect the carry flag + brcs nOverflow ;[9] Too many bytes received. Ignore packet + st Y+, x4 ;[10] store the last received byte + ;[11] st needs two cycles + +; bit1 + in x2, USBIN ;[0] sample line state + andi x1, USBMASK ;[1] check for se0 during bit 0 + breq nse0 ;[2] + andi x2, USBMASK ;[3] check se0 during bit 1 + breq nse0 ;[4] + eor x1, x2 ;[5] + bst x1, USBMINUS ;[6] + bld shift, 1 ;[7] + mov x1, shift ;[8] + andi x1, 0xF3 ;[9] + breq unstuff1 ;[10] +didunstuff1: + nop ;[11] + +; bit2 + in x1, USBIN ;[0] sample line state + andi x1, USBMASK ;[1] check for se0 (as there is nothing else to do here + breq nOverflow ;[2] + eor x2, x1 ;[3] generates the inverted of the actual bit + bst x2, USBMINUS ;[4] + bld shift, 2 ;[5] store the bit + mov x2, shift ;[6] + andi x2, 0xE7 ;[7] if we have six zeros here (which means six 1 in the stream) + breq unstuff2 ;[8] the next bit is a stuffing bit +didunstuff2: + nop2 ;[9] + ;[10] + nop ;[11] + +; bit3 + in x2, USBIN ;[0] sample line state + andi x2, USBMASK ;[1] check for se0 + breq nOverflow ;[2] + eor x1, x2 ;[3] + bst x1, USBMINUS ;[4] + bld shift, 3 ;[5] + mov x1, shift ;[6] + andi x1, 0xCF ;[7] + breq unstuff3 ;[8] +didunstuff3: + nop ;[9] + rjmp rxDataBit4 ;[10] + ;[11] + +; the avr branch instructions allow an offset of +63 insturction only, so we need this +; 'local copy' of se0 +nse0: + rjmp se0 ;[4] + ;[5] +; the same same as for se0 is needed for overflow and StuffErr +nOverflow: +stuffErr: + rjmp overflow + + +unstuff0: ;[8] this is the branch delay of breq unstuffX + andi x1, USBMASK ;[9] do an se0 check here (if the last crc byte ends with 5 one's we might end up here + breq didunstuff0 ;[10] event tough the message is complete -> jump back and store the byte + ori shift, 0x01 ;[11] invert the last received bit to prevent furhter unstuffing + in x2, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors + andi x5, 0xFE ;[1] mark this bit as inverted (will be corrected before storing shift) + eor x1, x2 ;[2] x1 and x2 have to be different because the stuff bit is always a zero + andi x1, USBMASK ;[3] mask the interesting bits + breq stuffErr ;[4] if the stuff bit is a 1-bit something went wrong + mov x1, x2 ;[5] the next bit expects the last state to be in x1 + rjmp didunstuff0 ;[6] + ;[7] jump delay of rjmp didunstuffX + +unstuff1: ;[11] this is the jump delay of breq unstuffX + in x1, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors + ori shift, 0x02 ;[1] invert the last received bit to prevent furhter unstuffing + andi x5, 0xFD ;[2] mark this bit as inverted (will be corrected before storing shift) + eor x2, x1 ;[3] x1 and x2 have to be different because the stuff bit is always a zero + andi x2, USBMASK ;[4] mask the interesting bits + breq stuffErr ;[5] if the stuff bit is a 1-bit something went wrong + mov x2, x1 ;[6] the next bit expects the last state to be in x2 + nop2 ;[7] + ;[8] + rjmp didunstuff1 ;[9] + ;[10] jump delay of rjmp didunstuffX + +unstuff2: ;[9] this is the jump delay of breq unstuffX + ori shift, 0x04 ;[10] invert the last received bit to prevent furhter unstuffing + andi x5, 0xFB ;[11] mark this bit as inverted (will be corrected before storing shift) + in x2, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors + eor x1, x2 ;[1] x1 and x2 have to be different because the stuff bit is always a zero + andi x1, USBMASK ;[2] mask the interesting bits + breq stuffErr ;[3] if the stuff bit is a 1-bit something went wrong + mov x1, x2 ;[4] the next bit expects the last state to be in x1 + nop2 ;[5] + ;[6] + rjmp didunstuff2 ;[7] + ;[8] jump delay of rjmp didunstuffX + +unstuff3: ;[9] this is the jump delay of breq unstuffX + ori shift, 0x08 ;[10] invert the last received bit to prevent furhter unstuffing + andi x5, 0xF7 ;[11] mark this bit as inverted (will be corrected before storing shift) + in x1, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors + eor x2, x1 ;[1] x1 and x2 have to be different because the stuff bit is always a zero + andi x2, USBMASK ;[2] mask the interesting bits + breq stuffErr ;[3] if the stuff bit is a 1-bit something went wrong + mov x2, x1 ;[4] the next bit expects the last state to be in x2 + nop2 ;[5] + ;[6] + rjmp didunstuff3 ;[7] + ;[8] jump delay of rjmp didunstuffX + + + +; the include has to be here due to branch distance restirctions +#define __USE_CRC__ +#include "asmcommon.inc" + + + +; USB spec says: +; idle = J +; J = (D+ = 0), (D- = 1) +; K = (D+ = 1), (D- = 0) +; Spec allows 7.5 bit times from EOP to SOP for replies +; 7.5 bit times is 90 cycles. ...there is plenty of time + + +sendNakAndReti: + ldi x3, USBPID_NAK ;[-18] + rjmp sendX3AndReti ;[-17] +sendAckAndReti: + ldi cnt, USBPID_ACK ;[-17] +sendCntAndReti: + mov x3, cnt ;[-16] +sendX3AndReti: + ldi YL, 20 ;[-15] x3==r20 address is 20 + ldi YH, 0 ;[-14] + ldi cnt, 2 ;[-13] +; rjmp usbSendAndReti fallthrough + +;usbSend: +;pointer to data in 'Y' +;number of bytes in 'cnt' -- including sync byte [range 2 ... 12] +;uses: x1...x4, btcnt, shift, cnt, Y +;Numbers in brackets are time since first bit of sync pattern is sent + +usbSendAndReti: ; 12 cycles until SOP + in x2, USBDDR ;[-12] + ori x2, USBMASK ;[-11] + sbi USBOUT, USBMINUS;[-10] prepare idle state; D+ and D- must have been 0 (no pullups) + in x1, USBOUT ;[-8] port mirror for tx loop + out USBDDR, x2 ;[-6] <- acquire bus + ldi x2, 0 ;[-6] init x2 (bitstuff history) because sync starts with 0 + ldi x4, USBMASK ;[-5] exor mask + ldi shift, 0x80 ;[-4] sync byte is first byte sent +txByteLoop: + ldi bitcnt, 0x40 ;[-3]=[9] binary 01000000 +txBitLoop: ; the loop sends the first 7 bits of the byte + sbrs shift, 0 ;[-2]=[10] if we have to send a 1 don't change the line state + eor x1, x4 ;[-1]=[11] + out USBOUT, x1 ;[0] + ror shift ;[1] + ror x2 ;[2] transfers the last sent bit to the stuffing history +didStuffN: + nop ;[3] + nop ;[4] + cpi x2, 0xfc ;[5] if we sent six consecutive ones + brcc bitstuffN ;[6] + lsr bitcnt ;[7] + brne txBitLoop ;[8] restart the loop while the 1 is still in the bitcount + +; transmit bit 7 + sbrs shift, 0 ;[9] + eor x1, x4 ;[10] +didStuff7: + ror shift ;[11] + out USBOUT, x1 ;[0] transfer bit 7 to the pins + ror x2 ;[1] move the bit into the stuffing history + cpi x2, 0xfc ;[2] + brcc bitstuff7 ;[3] + ld shift, y+ ;[4] get next byte to transmit + dec cnt ;[5] decrement byte counter + brne txByteLoop ;[7] if we have more bytes start next one + ;[8] branch delay + +;make SE0: + cbr x1, USBMASK ;[8] prepare SE0 [spec says EOP may be 25 to 30 cycles] + lds x2, usbNewDeviceAddr;[9] + lsl x2 ;[11] we compare with left shifted address + out USBOUT, x1 ;[0] <-- out SE0 -- from now 2 bits = 24 cycles until bus idle + subi YL, 20 + 2 ;[1] Only assign address on data packets, not ACK/NAK in x3 + sbci YH, 0 ;[2] +;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm: +;set address only after data packet was sent, not after handshake + breq skipAddrAssign ;[3] + sts usbDeviceAddr, x2 ; if not skipped: SE0 is one cycle longer +skipAddrAssign: +;end of usbDeviceAddress transfer + ldi x2, 1<<USB_INTR_PENDING_BIT;[5] int0 occurred during TX -- clear pending flag + USB_STORE_PENDING(x2) ;[6] + ori x1, USBIDLE ;[7] + in x2, USBDDR ;[8] + cbr x2, USBMASK ;[9] set both pins to input + mov x3, x1 ;[10] + cbr x3, USBMASK ;[11] configure no pullup on both pins + ldi x4, 4 ;[12] +se0Delay: + dec x4 ;[13] [16] [19] [22] + brne se0Delay ;[14] [17] [20] [23] + out USBOUT, x1 ;[24] <-- out J (idle) -- end of SE0 (EOP signal) + out USBDDR, x2 ;[25] <-- release bus now + out USBOUT, x3 ;[26] <-- ensure no pull-up resistors are active + rjmp doReturn + +bitstuffN: + eor x1, x4 ;[8] generate a zero + ldi x2, 0 ;[9] reset the bit stuffing history + nop2 ;[10] + out USBOUT, x1 ;[0] <-- send the stuffing bit + rjmp didStuffN ;[1] + +bitstuff7: + eor x1, x4 ;[5] + ldi x2, 0 ;[6] reset bit stuffing history + clc ;[7] fill a zero into the shift register + rol shift ;[8] compensate for ror shift at branch destination + rjmp didStuff7 ;[9] + ;[10] jump delay + +;-------------------------------------------------------------------------------------------------------------- +; receives data bytes and calculates the crc +; second half of the data byte receiver loop +; most parts of the crc algorithm are here +;-------------------------------------------------------------------------------------------------------------- + +nOverflow2: + rjmp overflow + +rxDataBit4: + in x1, USBIN ;[0] sample line state + andi x1, USBMASK ;[1] check for se0 + breq nOverflow2 ;[2] + eor x2, x1 ;[3] + bst x2, USBMINUS ;[4] + bld shift, 4 ;[5] + mov x2, shift ;[6] + andi x2, 0x9F ;[7] + breq unstuff4 ;[8] +didunstuff4: + nop2 ;[9][10] + nop ;[11] + +; bit5 + in x2, USBIN ;[0] sample line state + ldi ZH, hi8(usbCrcTableHigh);[1] use the table for the higher byte + eor x1, x2 ;[2] + bst x1, USBMINUS ;[3] + bld shift, 5 ;[4] + mov x1, shift ;[5] + andi x1, 0x3F ;[6] + breq unstuff5 ;[7] +didunstuff5: + lpm x4, Z ;[8] load the higher crc xor-byte and store it for later use + ;[9] lpm needs 3 cycles + ;[10] + ldi ZH, hi8(usbCrcTableLow);[11] load the lower crc xor byte adress + +; bit6 + in x1, USBIN ;[0] sample line state + eor x2, x1 ;[1] + bst x2, USBMINUS ;[2] + bld shift, 6 ;[3] + mov x2, shift ;[4] + andi x2, 0x7E ;[5] + breq unstuff6 ;[6] +didunstuff6: + lpm ZL, Z ;[7] load the lower xor crc byte + ;[8] lpm needs 3 cycles + ;[9] + eor ZL, x3 ;[10] xor the old high crc byte with the low xor-byte + mov x3, x4 ;[11] move the new high order crc value from temp to its destination + +; bit7 + in x2, USBIN ;[0] sample line state + eor x1, x2 ;[1] + bst x1, USBMINUS ;[2] + bld shift, 7 ;[3] now shift holds the complete but inverted data byte + mov x1, shift ;[4] + andi x1, 0xFC ;[5] + breq unstuff7 ;[6] +didunstuff7: + eor x5, shift ;[7] x5 marks all bits which have not been inverted by the unstuffing subs + mov x4, x5 ;[8] keep a copy of the data byte it will be stored during next bit0 + eor ZL, x4 ;[9] feed the actual byte into the crc algorithm + rjmp rxDataStart ;[10] next byte + ;[11] during the reception of the next byte this one will be fed int the crc algorithm + +unstuff4: ;[9] this is the jump delay of rjmp unstuffX + ori shift, 0x10 ;[10] invert the last received bit to prevent furhter unstuffing + andi x5, 0xEF ;[11] mark this bit as inverted (will be corrected before storing shift) + in x2, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors + eor x1, x2 ;[1] x1 and x2 have to be different because the stuff bit is always a zero + andi x1, USBMASK ;[2] mask the interesting bits + breq stuffErr2 ;[3] if the stuff bit is a 1-bit something went wrong + mov x1, x2 ;[4] the next bit expects the last state to be in x1 + nop2 ;[5] + ;[6] + rjmp didunstuff4 ;[7] + ;[8] jump delay of rjmp didunstuffX + +unstuff5: ;[8] this is the jump delay of rjmp unstuffX + nop ;[9] + ori shift, 0x20 ;[10] invert the last received bit to prevent furhter unstuffing + andi x5, 0xDF ;[11] mark this bit as inverted (will be corrected before storing shift) + in x1, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors + eor x2, x1 ;[1] x1 and x2 have to be different because the stuff bit is always a zero + andi x2, USBMASK ;[2] mask the interesting bits + breq stuffErr2 ;[3] if the stuff bit is a 1-bit something went wrong + mov x2, x1 ;[4] the next bit expects the last state to be in x2 + nop ;[5] + rjmp didunstuff5 ;[6] + ;[7] jump delay of rjmp didunstuffX + +unstuff6: ;[7] this is the jump delay of rjmp unstuffX + nop2 ;[8] + ;[9] + ori shift, 0x40 ;[10] invert the last received bit to prevent furhter unstuffing + andi x5, 0xBF ;[11] mark this bit as inverted (will be corrected before storing shift) + in x2, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors + eor x1, x2 ;[1] x1 and x2 have to be different because the stuff bit is always a zero + andi x1, USBMASK ;[2] mask the interesting bits + breq stuffErr2 ;[3] if the stuff bit is a 1-bit something went wrong + mov x1, x2 ;[4] the next bit expects the last state to be in x1 + rjmp didunstuff6 ;[5] + ;[6] jump delay of rjmp didunstuffX + +unstuff7: ;[7] this is the jump delay of rjmp unstuffX + nop ;[8] + nop ;[9] + ori shift, 0x80 ;[10] invert the last received bit to prevent furhter unstuffing + andi x5, 0x7F ;[11] mark this bit as inverted (will be corrected before storing shift) + in x1, USBIN ;[0] we have some free cycles so we could check for bit stuffing errors + eor x2, x1 ;[1] x1 and x2 have to be different because the stuff bit is always a zero + andi x2, USBMASK ;[2] mask the interesting bits + breq stuffErr2 ;[3] if the stuff bit is a 1-bit something went wrong + mov x2, x1 ;[4] the next bit expects the last state to be in x2 + rjmp didunstuff7 ;[5] + ;[6] jump delay of rjmp didunstuff7 + +; local copy of the stuffErr desitnation for the second half of the receiver loop +stuffErr2: + rjmp stuffErr + +;-------------------------------------------------------------------------------------------------------------- +; The crc table follows. It has to be aligned to enable a fast loading of the needed bytes. +; There are two tables of 256 entries each, the low and the high byte table. +; Table values were generated with the following C code: +/* +#include <stdio.h> +int main (int argc, char **argv) +{ + int i, j; + for (i=0; i<512; i++){ + unsigned short crc = i & 0xff; + for(j=0; j<8; j++) crc = (crc >> 1) ^ ((crc & 1) ? 0xa001 : 0); + if((i & 7) == 0) printf("\n.byte "); + printf("0x%02x, ", (i > 0xff ? (crc >> 8) : crc) & 0xff); + if(i == 255) printf("\n"); + } + return 0; +} + +// Use the following algorithm to compute CRC values: +ushort computeCrc(uchar *msg, uchar msgLen) +{ + uchar i; + ushort crc = 0xffff; + for(i = 0; i < msgLen; i++) + crc = usbCrcTable16[lo8(crc) ^ msg[i]] ^ hi8(crc); + return crc; +} +*/ + +.balign 256 +usbCrcTableLow: +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41 +.byte 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 + +; .balign 256 +usbCrcTableHigh: +.byte 0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2 +.byte 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04 +.byte 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E +.byte 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8 +.byte 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A +.byte 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC +.byte 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6 +.byte 0xD2, 0x12, 0x13, 0xD3, 0x11, 0xD1, 0xD0, 0x10 +.byte 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32 +.byte 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4 +.byte 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE +.byte 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38 +.byte 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA +.byte 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C +.byte 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26 +.byte 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0 +.byte 0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62 +.byte 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4 +.byte 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE +.byte 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68 +.byte 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA +.byte 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C +.byte 0xB4, 0x74, 0x75, 0xB5, 0x77, 0xB7, 0xB6, 0x76 +.byte 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0 +.byte 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92 +.byte 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54 +.byte 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E +.byte 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98 +.byte 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A +.byte 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C +.byte 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86 +.byte 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80, 0x40 + diff --git a/usbdrv/usbdrvasm20.inc b/usbdrv/usbdrvasm20.inc new file mode 100644 index 0000000..5027edd --- /dev/null +++ b/usbdrv/usbdrvasm20.inc @@ -0,0 +1,359 @@ +/* Name: usbdrvasm20.inc + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Jeroen Benschop + * Based on usbdrvasm16.inc from Christian Starkjohann + * Creation Date: 2008-03-05 + * Tabsize: 4 + * Copyright: (c) 2008 by Jeroen Benschop and OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* Do not link this file! Link usbdrvasm.S instead, which includes the + * appropriate implementation! + */ + +/* +General Description: +This file is the 20 MHz version of the asssembler part of the USB driver. It +requires a 20 MHz crystal (not a ceramic resonator and not a calibrated RC +oscillator). + +See usbdrv.h for a description of the entire driver. + +Since almost all of this code is timing critical, don't change unless you +really know what you are doing! Many parts require not only a maximum number +of CPU cycles, but even an exact number of cycles! +*/ + +#define leap2 x3 +#ifdef __IAR_SYSTEMS_ASM__ +#define nextInst $+2 +#else +#define nextInst .+0 +#endif + +;max stack usage: [ret(2), YL, SREG, YH, bitcnt, shift, x1, x2, x3, x4, cnt] = 12 bytes +;nominal frequency: 20 MHz -> 13.333333 cycles per bit, 106.666667 cycles per byte +; Numbers in brackets are clocks counted from center of last sync bit +; when instruction starts +;register use in receive loop: +; shift assembles the byte currently being received +; x1 holds the D+ and D- line state +; x2 holds the previous line state +; x4 (leap) is used to add a leap cycle once every three bytes received +; X3 (leap2) is used to add a leap cycle once every three stuff bits received +; bitcnt is used to determine when a stuff bit is due +; cnt holds the number of bytes left in the receive buffer + +USB_INTR_VECTOR: +;order of registers pushed: YL, SREG YH, [sofError], bitcnt, shift, x1, x2, x3, x4, cnt + push YL ;[-28] push only what is necessary to sync with edge ASAP + in YL, SREG ;[-26] + push YL ;[-25] + push YH ;[-23] +;---------------------------------------------------------------------------- +; Synchronize with sync pattern: +;---------------------------------------------------------------------------- +;sync byte (D-) pattern LSb to MSb: 01010100 [1 = idle = J, 0 = K] +;sync up with J to K edge during sync pattern -- use fastest possible loops +;The first part waits at most 1 bit long since we must be in sync pattern. +;YL is guarenteed to be < 0x80 because I flag is clear. When we jump to +;waitForJ, ensure that this prerequisite is met. +waitForJ: + inc YL + sbis USBIN, USBMINUS + brne waitForJ ; just make sure we have ANY timeout +waitForK: +;The following code results in a sampling window of < 1/4 bit which meets the spec. + sbis USBIN, USBMINUS ;[-19] + rjmp foundK ;[-18] + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK + sbis USBIN, USBMINUS + rjmp foundK +#if USB_COUNT_SOF + lds YL, usbSofCount + inc YL + sts usbSofCount, YL +#endif /* USB_COUNT_SOF */ +#ifdef USB_SOF_HOOK + USB_SOF_HOOK +#endif + rjmp sofError +foundK: ;[-16] +;{3, 5} after falling D- edge, average delay: 4 cycles +;bit0 should be at 34 for center sampling. Currently at 4 so 30 cylces till bit 0 sample +;use 1 bit time for setup purposes, then sample again. Numbers in brackets +;are cycles from center of first sync (double K) bit after the instruction + push bitcnt ;[-16] +; [---] ;[-15] + lds YL, usbInputBufOffset;[-14] +; [---] ;[-13] + clr YH ;[-12] + subi YL, lo8(-(usbRxBuf));[-11] [rx loop init] + sbci YH, hi8(-(usbRxBuf));[-10] [rx loop init] + push shift ;[-9] +; [---] ;[-8] + ldi shift,0x40 ;[-7] set msb to "1" so processing bit7 can be detected + nop2 ;[-6] +; [---] ;[-5] + ldi bitcnt, 5 ;[-4] [rx loop init] + sbis USBIN, USBMINUS ;[-3] we want two bits K (sample 3 cycles too early) + rjmp haveTwoBitsK ;[-2] + pop shift ;[-1] undo the push from before + pop bitcnt ;[1] + rjmp waitForK ;[3] this was not the end of sync, retry +; The entire loop from waitForK until rjmp waitForK above must not exceed two +; bit times (= 27 cycles). + +;---------------------------------------------------------------------------- +; push more registers and initialize values while we sample the first bits: +;---------------------------------------------------------------------------- +haveTwoBitsK: + push x1 ;[0] + push x2 ;[2] + push x3 ;[4] (leap2) + ldi leap2, 0x55 ;[6] add leap cycle on 2nd,5th,8th,... stuff bit + push x4 ;[7] == leap + ldi leap, 0x55 ;[9] skip leap cycle on 2nd,5th,8th,... byte received + push cnt ;[10] + ldi cnt, USB_BUFSIZE ;[12] [rx loop init] + ldi x2, 1<<USBPLUS ;[13] current line state is K state. D+=="1", D-=="0" +bit0: + in x1, USBIN ;[0] sample line state + andi x1, USBMASK ;[1] filter only D+ and D- bits + rjmp handleBit ;[2] make bit0 14 cycles long + +;---------------------------------------------------------------------------- +; Process bit7. However, bit 6 still may need unstuffing. +;---------------------------------------------------------------------------- + +b6checkUnstuff: + dec bitcnt ;[9] + breq unstuff6 ;[10] +bit7: + subi cnt, 1 ;[11] cannot use dec becaus it does not affect the carry flag + brcs overflow ;[12] Too many bytes received. Ignore packet + in x1, USBIN ;[0] sample line state + andi x1, USBMASK ;[1] filter only D+ and D- bits + cpse x1, x2 ;[2] when previous line state equals current line state, handle "1" + rjmp b7handle0 ;[3] when line state differs, handle "0" + sec ;[4] + ror shift ;[5] shift "1" into the data + st y+, shift ;[6] store the data into the buffer + ldi shift, 0x40 ;[7] reset data for receiving the next byte + subi leap, 0x55 ;[9] trick to introduce a leap cycle every 3 bytes + brcc nextInst ;[10 or 11] it will fail after 85 bytes. However low speed can only receive 11 + dec bitcnt ;[11 or 12] + brne bit0 ;[12 or 13] + ldi x1, 1 ;[13 or 14] unstuffing bit 7 + in bitcnt, USBIN ;[0] sample stuff bit + rjmp unstuff ;[1] + +b7handle0: + mov x2,x1 ;[5] Set x2 to current line state + ldi bitcnt, 6 ;[6] + lsr shift ;[7] shift "0" into the data + st y+, shift ;[8] store data into the buffer + ldi shift, 0x40 ;[10] reset data for receiving the next byte + subi leap, 0x55 ;[11] trick to introduce a leap cycle every 3 bytes + brcs bit0 ;[12] it will fail after 85 bytes. However low speed can only receive 11 + rjmp bit0 ;[13] + + +;---------------------------------------------------------------------------- +; Handle unstuff +; x1==0xFF indicate unstuffing bit6 +;---------------------------------------------------------------------------- + +unstuff6: + ldi x1,0xFF ;[12] indicate unstuffing bit 6 + in bitcnt, USBIN ;[0] sample stuff bit + nop ;[1] fix timing +unstuff: ;b0-5 b6 b7 + mov x2,bitcnt ;[3] [2] [3] Set x2 to match line state + subi leap2, 0x55 ;[4] [3] [4] delay loop + brcs nextInst ;[5] [4] [5] add one cycle every three stuff bits + sbci leap2,0 ;[6] [5] [6] + ldi bitcnt,6 ;[7] [6] [7] reset bit stuff counter + andi x2, USBMASK ;[8] [7] [8] only keep D+ and D- + cpi x1,0 ;[9] [8] [9] + brmi bit7 ;[10] [9] [10] finished unstuffing bit6 When x1<0 + breq bitloop ;[11] --- [11] finished unstuffing bit0-5 when x1=0 + nop ;--- --- [12] + in x1, USBIN ;--- --- [0] sample line state for bit0 + andi x1, USBMASK ;--- --- [1] filter only D+ and D- bits + rjmp handleBit ;--- --- [2] make bit0 14 cycles long + +;---------------------------------------------------------------------------- +; Receiver loop (numbers in brackets are cycles within byte after instr) +;---------------------------------------------------------------------------- +bitloop: + in x1, USBIN ;[0] sample line state + andi x1, USBMASK ;[1] filter only D+ and D- bits + breq se0 ;[2] both lines are low so handle se0 +handleBit: + cpse x1, x2 ;[3] when previous line state equals current line state, handle "1" + rjmp handle0 ;[4] when line state differs, handle "0" + sec ;[5] + ror shift ;[6] shift "1" into the data + brcs b6checkUnstuff ;[7] When after shift C is set, next bit is bit7 + nop2 ;[8] + dec bitcnt ;[10] + brne bitloop ;[11] + ldi x1,0 ;[12] indicate unstuff for bit other than bit6 or bit7 + in bitcnt, USBIN ;[0] sample stuff bit + rjmp unstuff ;[1] + +handle0: + mov x2, x1 ;[6] Set x2 to current line state + ldi bitcnt, 6 ;[7] reset unstuff counter. + lsr shift ;[8] shift "0" into the data + brcs bit7 ;[9] When after shift C is set, next bit is bit7 + nop ;[10] + rjmp bitloop ;[11] + +;---------------------------------------------------------------------------- +; End of receive loop. Now start handling EOP +;---------------------------------------------------------------------------- + +macro POP_STANDARD ; 14 cycles + pop cnt + pop x4 + pop x3 + pop x2 + pop x1 + pop shift + pop bitcnt + endm +macro POP_RETI ; 7 cycles + pop YH + pop YL + out SREG, YL + pop YL + endm + + + +#include "asmcommon.inc" + +; USB spec says: +; idle = J +; J = (D+ = 0), (D- = 1) +; K = (D+ = 1), (D- = 0) +; Spec allows 7.5 bit times from EOP to SOP for replies +; 7.5 bit times is 100 cycles. This implementation arrives a bit later at se0 +; then specified in the include file but there is plenty of time + +bitstuffN: + eor x1, x4 ;[8] + ldi x2, 0 ;[9] + nop2 ;[10] + out USBOUT, x1 ;[12] <-- out + rjmp didStuffN ;[0] + +bitstuff7: + eor x1, x4 ;[6] + ldi x2, 0 ;[7] Carry is zero due to brcc + rol shift ;[8] compensate for ror shift at branch destination + nop2 ;[9] + rjmp didStuff7 ;[11] + +sendNakAndReti: + ldi x3, USBPID_NAK ;[-18] + rjmp sendX3AndReti ;[-17] +sendAckAndReti: + ldi cnt, USBPID_ACK ;[-17] +sendCntAndReti: + mov x3, cnt ;[-16] +sendX3AndReti: + ldi YL, 20 ;[-15] x3==r20 address is 20 + ldi YH, 0 ;[-14] + ldi cnt, 2 ;[-13] +; rjmp usbSendAndReti fallthrough + +;usbSend: +;pointer to data in 'Y' +;number of bytes in 'cnt' -- including sync byte [range 2 ... 12] +;uses: x1...x4, btcnt, shift, cnt, Y +;Numbers in brackets are time since first bit of sync pattern is sent +;We don't match the transfer rate exactly (don't insert leap cycles every third +;byte) because the spec demands only 1.5% precision anyway. +usbSendAndReti: ; 12 cycles until SOP + in x2, USBDDR ;[-12] + ori x2, USBMASK ;[-11] + sbi USBOUT, USBMINUS;[-10] prepare idle state; D+ and D- must have been 0 (no pullups) + in x1, USBOUT ;[-8] port mirror for tx loop + out USBDDR, x2 ;[-7] <- acquire bus +; need not init x2 (bitstuff history) because sync starts with 0 + ldi x4, USBMASK ;[-6] exor mask + ldi shift, 0x80 ;[-5] sync byte is first byte sent +txByteLoop: + ldi bitcnt, 0x49 ;[-4] [10] binary 01001001 +txBitLoop: + sbrs shift, 0 ;[-3] [10] [11] + eor x1, x4 ;[-2] [11] [12] + out USBOUT, x1 ;[-1] [12] [13] <-- out N + ror shift ;[0] [13] [14] + ror x2 ;[1] +didStuffN: + nop2 ;[2] + nop ;[4] + cpi x2, 0xfc ;[5] + brcc bitstuffN ;[6] + lsr bitcnt ;[7] + brcc txBitLoop ;[8] + brne txBitLoop ;[9] + + sbrs shift, 0 ;[10] + eor x1, x4 ;[11] +didStuff7: + out USBOUT, x1 ;[-1] [13] <-- out 7 + ror shift ;[0] [14] + ror x2 ;[1] + nop ;[2] + cpi x2, 0xfc ;[3] + brcc bitstuff7 ;[4] + ld shift, y+ ;[5] + dec cnt ;[7] + brne txByteLoop ;[8] +;make SE0: + cbr x1, USBMASK ;[9] prepare SE0 [spec says EOP may be 25 to 30 cycles] + lds x2, usbNewDeviceAddr;[10] + lsl x2 ;[12] we compare with left shifted address + out USBOUT, x1 ;[13] <-- out SE0 -- from now 2 bits = 22 cycles until bus idle + subi YL, 20 + 2 ;[0] Only assign address on data packets, not ACK/NAK in x3 + sbci YH, 0 ;[1] +;2006-03-06: moved transfer of new address to usbDeviceAddr from C-Code to asm: +;set address only after data packet was sent, not after handshake + breq skipAddrAssign ;[2] + sts usbDeviceAddr, x2; if not skipped: SE0 is one cycle longer +skipAddrAssign: +;end of usbDeviceAddress transfer + ldi x2, 1<<USB_INTR_PENDING_BIT;[4] int0 occurred during TX -- clear pending flag + USB_STORE_PENDING(x2) ;[5] + ori x1, USBIDLE ;[6] + in x2, USBDDR ;[7] + cbr x2, USBMASK ;[8] set both pins to input + mov x3, x1 ;[9] + cbr x3, USBMASK ;[10] configure no pullup on both pins + ldi x4, 5 ;[11] +se0Delay: + dec x4 ;[12] [15] [18] [21] [24] + brne se0Delay ;[13] [16] [19] [22] [25] + out USBOUT, x1 ;[26] <-- out J (idle) -- end of SE0 (EOP signal) + out USBDDR, x2 ;[27] <-- release bus now + out USBOUT, x3 ;[28] <-- ensure no pull-up resistors are active + rjmp doReturn diff --git a/usbdrv/usbportability.h b/usbdrv/usbportability.h new file mode 100644 index 0000000..0a861d0 --- /dev/null +++ b/usbdrv/usbportability.h @@ -0,0 +1,143 @@ +/* Name: usbportability.h + * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers + * Author: Christian Starkjohann + * Creation Date: 2008-06-17 + * Tabsize: 4 + * Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH + * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) + */ + +/* +General Description: +This header is intended to contain all (or at least most of) the compiler +and library dependent stuff. The C code is written for avr-gcc and avr-libc. +The API of other development environments is converted to gcc's and avr-libc's +API by means of defines. + +This header also contains all system includes since they depend on the +development environment. + +Thanks to Oleg Semyonov for his help with the IAR tools port! +*/ + +#ifndef __usbportability_h_INCLUDED__ +#define __usbportability_h_INCLUDED__ + +/* We check explicitly for IAR and CodeVision. Default is avr-gcc/avr-libc. */ + +/* ------------------------------------------------------------------------- */ +#if defined __IAR_SYSTEMS_ICC__ || defined __IAR_SYSTEMS_ASM__ /* check for IAR */ +/* ------------------------------------------------------------------------- */ + +#ifndef ENABLE_BIT_DEFINITIONS +# define ENABLE_BIT_DEFINITIONS 1 /* Enable bit definitions */ +#endif + +/* Include IAR headers */ +#include <ioavr.h> +#ifndef __IAR_SYSTEMS_ASM__ +# include <inavr.h> +#endif + +#define __attribute__(arg) /* not supported on IAR */ + +#ifdef __IAR_SYSTEMS_ASM__ +# define __ASSEMBLER__ /* IAR does not define standard macro for asm */ +#endif + +#ifdef __HAS_ELPM__ +# define PROGMEM __farflash +#else +# define PROGMEM __flash +#endif + +#define USB_READ_FLASH(addr) (*(PROGMEM char *)(addr)) + +/* The following definitions are not needed by the driver, but may be of some + * help if you port a gcc based project to IAR. + */ +#define cli() __disable_interrupt() +#define sei() __enable_interrupt() +#define wdt_reset() __watchdog_reset() +#define _BV(x) (1 << (x)) + +/* assembler compatibility macros */ +#define nop2 rjmp $+2 /* jump to next instruction */ +#define XL r26 +#define XH r27 +#define YL r28 +#define YH r29 +#define ZL r30 +#define ZH r31 +#define lo8(x) LOW(x) +#define hi8(x) (((x)>>8) & 0xff) /* not HIGH to allow XLINK to make a proper range check */ + +/* Depending on the device you use, you may get problems with the way usbdrv.h + * handles the differences between devices. Since IAR does not use #defines + * for MCU registers, we can't check for the existence of a particular + * register with an #ifdef. If the autodetection mechanism fails, include + * definitions for the required USB_INTR_* macros in your usbconfig.h. See + * usbconfig-prototype.h and usbdrv.h for details. + */ + +/* ------------------------------------------------------------------------- */ +#elif __CODEVISIONAVR__ /* check for CodeVision AVR */ +/* ------------------------------------------------------------------------- */ +/* This port is not working (yet) */ + +/* #define F_CPU _MCU_CLOCK_FREQUENCY_ seems to be defined automatically */ + +#include <io.h> +#include <delay.h> + +#define __attribute__(arg) /* not supported on IAR */ + +#define PROGMEM __flash +#define USB_READ_FLASH(addr) (*(PROGMEM char *)(addr)) + +#ifndef __ASSEMBLER__ +static inline void cli(void) +{ + #asm("cli"); +} +static inline void sei(void) +{ + #asm("sei"); +} +#endif +#define _delay_ms(t) delay_ms(t) +#define _BV(x) (1 << (x)) +#define USB_CFG_USE_SWITCH_STATEMENT 1 /* macro for if() cascase fails for unknown reason */ + +#define macro .macro +#define endm .endmacro +#define nop2 rjmp .+0 /* jump to next instruction */ + +/* ------------------------------------------------------------------------- */ +#else /* default development environment is avr-gcc/avr-libc */ +/* ------------------------------------------------------------------------- */ + +#include <avr/io.h> +#ifdef __ASSEMBLER__ +# define _VECTOR(N) __vector_ ## N /* io.h does not define this for asm */ +#else +# include <avr/pgmspace.h> +#endif + +#if USB_CFG_DRIVER_FLASH_PAGE +# define USB_READ_FLASH(addr) pgm_read_byte_far(((long)USB_CFG_DRIVER_FLASH_PAGE << 16) | (long)(addr)) +#else +# define USB_READ_FLASH(addr) pgm_read_byte(addr) +#endif + +#define macro .macro +#define endm .endm +#define nop2 rjmp .+0 /* jump to next instruction */ + +#endif /* development environment */ + +/* for conveniecne, ensure that PRG_RDB exists */ +#ifndef PRG_RDB +# define PRG_RDB(addr) USB_READ_FLASH(addr) +#endif +#endif /* __usbportability_h_INCLUDED__ */ |