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Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 312 |
1 files changed, 0 insertions, 312 deletions
@@ -1,312 +0,0 @@ -/* - Project: Rotary-Dial-To-USB Interface - Author: Florian Jung (flo@windfisch.org) - Copyright: (c) 2014 by Florian Jung and partially others (see below) - License: GNU GPL v3 (see LICENSE) - - This program is free software: you can redistribute it and/or modify - it under the terms of the GNU General Public License version 3 as - published by the Free Software Foundation. - - 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, see <http://www.gnu.org/licenses/>. - - - This project is based on the code for the AVR ATtiny USB Tutorial at - http://codeandlife.com/ by Joonas Pihlajamaa, joonas.pihlajamaa@iki.fi, - which is in turn based on the V-USB example code by Christian Starkjohann - (Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH) -*/ - -#include <avr/io.h> -#include <avr/interrupt.h> -#include <avr/wdt.h> -#include <avr/eeprom.h> -#include <util/delay.h> - -#include "usbdrv/usbdrv.h" - -// ************************ -// *** USB HID ROUTINES *** -// ************************ - -// From Frank Zhao's USB Business Card project -// http://www.frank-zhao.com/cache/usbbusinesscard_details.php -PROGMEM const char - usbHidReportDescriptor[USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH] = { - 0x05, 0x01, // USAGE_PAGE (Generic Desktop) - 0x09, 0x06, // USAGE (Keyboard) - 0xa1, 0x01, // COLLECTION (Application) - 0x75, 0x01, // REPORT_SIZE (1) - 0x95, 0x08, // REPORT_COUNT (8) - 0x05, 0x07, // USAGE_PAGE (Keyboard)(Key Codes) - 0x19, 0xe0, // USAGE_MINIMUM (Keyboard LeftControl)(224) - 0x29, 0xe7, // USAGE_MAXIMUM (Keyboard Right GUI)(231) - 0x15, 0x00, // LOGICAL_MINIMUM (0) - 0x25, 0x01, // LOGICAL_MAXIMUM (1) - 0x81, 0x02, // INPUT (Data,Var,Abs) ; Modifier byte - 0x95, 0x01, // REPORT_COUNT (1) - 0x75, 0x08, // REPORT_SIZE (8) - 0x81, 0x03, // INPUT (Cnst,Var,Abs) ; Reserved byte - 0x95, 0x05, // REPORT_COUNT (5) - 0x75, 0x01, // REPORT_SIZE (1) - 0x05, 0x08, // USAGE_PAGE (LEDs) - 0x19, 0x01, // USAGE_MINIMUM (Num Lock) - 0x29, 0x05, // USAGE_MAXIMUM (Kana) - 0x91, 0x02, // OUTPUT (Data,Var,Abs) ; LED report - 0x95, 0x01, // REPORT_COUNT (1) - 0x75, 0x03, // REPORT_SIZE (3) - 0x91, 0x03, // OUTPUT (Cnst,Var,Abs) ; LED report padding - 0x95, 0x06, // REPORT_COUNT (6) - 0x75, 0x08, // REPORT_SIZE (8) - 0x15, 0x00, // LOGICAL_MINIMUM (0) - 0x25, 0x65, // LOGICAL_MAXIMUM (101) - 0x05, 0x07, // USAGE_PAGE (Keyboard)(Key Codes) - 0x19, 0x00, // USAGE_MINIMUM (Reserved (no event indicated))(0) - 0x29, 0x65, // USAGE_MAXIMUM (Keyboard Application)(101) - 0x81, 0x00, // INPUT (Data,Ary,Abs) - 0xc0 // END_COLLECTION -}; - -typedef struct -{ - uint8_t modifier; - uint8_t reserved; - uint8_t keycode[6]; -} keyboard_report_t; - -static keyboard_report_t keyboard_report; // sent to PC -volatile static uchar LED_state = 0xff; // received from PC -static uchar idleRate; // repeat rate for keyboards - - -#define LED_BLUE (1<<5) -#define LED_RED (1<<4) -#define LED_GREEN (1<<3) - -usbMsgLen_t usbFunctionSetup(uchar data[8]) -{ - usbRequest_t *rq = (void *) data; - - if ((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS) - { - switch (rq->bRequest) - { - case USBRQ_HID_GET_REPORT: // send "no keys pressed" if asked here - // wValue: ReportType (highbyte), ReportID (lowbyte) - usbMsgPtr = (void *) &keyboard_report; // we only have this one - keyboard_report.modifier = 0; - keyboard_report.keycode[0] = 0; - return sizeof(keyboard_report); - - case USBRQ_HID_SET_REPORT: // if wLength == 1, should be LED state - return (rq->wLength.word == 1) ? USB_NO_MSG : 0; - - case USBRQ_HID_GET_IDLE: // send idle rate to PC as required by spec - usbMsgPtr = &idleRate; - return 1; - - case USBRQ_HID_SET_IDLE: // save idle rate as required by spec - idleRate = rq->wValue.bytes[1]; - return 0; - } - } - - return 0; // by default don't return any data -} - -usbMsgLen_t usbFunctionWrite(uint8_t * data, uchar len) -{ - if (data[0] == LED_state) - return 1; - else - LED_state = data[0]; - - return 1; // Data read, not expecting more -} - -// Now only supports letters 'a' to 'z' and 0 (NULL) to clear buttons -void buildReport(int n) -{ - keyboard_report.modifier = 0; - - if (n > 0 && n <= 10) - keyboard_report.keycode[0] = 29+n; - else if (n == 0) - keyboard_report.keycode[0] = 39; - else if (n == -2) - keyboard_report.keycode[0] = 40; // enter - else if (n == -1) - keyboard_report.keycode[0] = 0; -} - -#define STATE_WAIT 0 -#define STATE_SEND_KEY 1 -#define STATE_RELEASE_KEY 2 - -void jump_to_bootloader(void) -{ - cli(); - wdt_enable(WDTO_15MS); - while (1); -} - - -#define DEBOUNCE_MAX 100 -uint8_t idle_stable = 42; -uint8_t pulse_stable = 42; -uint16_t idlectr = DEBOUNCE_MAX; -uint16_t pulsectr = DEBOUNCE_MAX; - -uint8_t oldidle = 42; -uint8_t oldpulse = 42; - -int main() -{ - int key_to_send; - int n_pulses = 0; - - uchar i, button_release_counter = 0, state = STATE_WAIT; - - DDRC = 0x38; // LEDs as output - PORTC |= LED_BLUE | LED_RED | LED_GREEN; - DDRD &= ~0xF3; // connector ports as input - DDRB &= ~0x3C; - PORTD &= ~0xF3; // disable pullups for unused ports - PORTB &= ~0x0C; - PORTB |= 0x30; // enable pullups for PB4 and 5 - - cli(); - - for (i = 0; i < sizeof(keyboard_report); i++) // clear report initially - ((uchar *) & keyboard_report)[i] = 0; - - wdt_enable(WDTO_1S); // enable 1s watchdog timer - - usbInit(); - - usbDeviceDisconnect(); // enforce re-enumeration - for (i = 0; i < 250; i++) - { // wait 500 ms - wdt_reset(); // keep the watchdog happy - _delay_ms(10); - } - usbDeviceConnect(); - - sei(); // Enable interrupts after re-enumeration - uint32_t j; - - while (1) - { - wdt_reset(); // keep the watchdog happy - usbPoll(); - - - // characters are sent when messageState == STATE_SEND and after receiving - // the initial LED state from PC (good way to wait until device is recognized) - - int idle = (PINB & 0x10); - int pulse = (PINB & 0x20); - - if (idle != idle_stable) - { - idlectr++; - if (idlectr > DEBOUNCE_MAX) - idle_stable = idle; - } - else - idlectr=0; - - if (pulse != pulse_stable) - { - pulsectr++; - if (pulsectr > DEBOUNCE_MAX) - pulse_stable = pulse; - } - else - pulsectr=0; - - if (pulse_stable) - PORTC &= ~LED_RED; - else - PORTC |= LED_RED; - - if (idle_stable) - PORTC |= LED_GREEN; - else - PORTC &= ~LED_GREEN; - - - if (oldidle == 42) // init - { - oldidle = idle_stable; - oldpulse = pulse_stable; - } - - if (oldidle && !idle_stable) - n_pulses = 0; - - if (!oldidle == 0 && idle_stable) - { - if (n_pulses > 17) - jump_to_bootloader(); - - // also check if some time has elapsed since last button press - if (state == STATE_WAIT && button_release_counter == 255) - { - if (n_pulses >= 1 && n_pulses <=10) - { - state = STATE_SEND_KEY; - key_to_send = n_pulses; - } - } - - button_release_counter = 0; // now button needs to be released a while until retrigger - - } - - if (!oldpulse && pulse_stable) - n_pulses++; - - oldidle = idle_stable; - oldpulse = pulse_stable; - - - if (button_release_counter < 255) - button_release_counter++; // increase release counter - - - - if (usbInterruptIsReady() && state != STATE_WAIT && LED_state != 0xff) - { - switch (state) - { - case STATE_SEND_KEY: - buildReport(key_to_send); - state = STATE_RELEASE_KEY; // release next - PORTC &= ~LED_BLUE; - break; - - case STATE_RELEASE_KEY: - buildReport(-1); - state = STATE_WAIT; // go back to waiting - PORTC |= LED_BLUE; - break; - - default: - state = STATE_WAIT; // should not happen - } - - // start sending - usbSetInterrupt((void *) &keyboard_report, sizeof(keyboard_report)); - } - } - - jump_to_bootloader(); - return 0; -} |