usb hello world \o/

1 files changed, 0 insertions, 345 deletions

diff --git a/usbdrv/usbdrvasm16.inc b/usbdrv/usbdrvasm16.inc
deleted file mode 100644
index 25b84e6..0000000
--- a/usbdrv/usbdrvasm16.inc
+++ /dev/null
@@ -1,345 +0,0 @@
-/* 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