129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
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/* Name: main.c
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* Project: hid-custom-rq example
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* Author: Christian Starkjohann
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* Creation Date: 2008-04-07
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* Tabsize: 4
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* Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH
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* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
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*/
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/*
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This example should run on most AVRs with only little changes. No special
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hardware resources except INT0 are used. You may have to change usbconfig.h for
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different I/O pins for USB. Please note that USB D+ must be the INT0 pin, or
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at least be connected to INT0 as well.
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*/
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#include <avr/io.h>
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#include <avr/wdt.h>
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#include <avr/interrupt.h> /* for sei() */
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#include <util/delay.h> /* for _delay_ms() */
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#include <avr/pgmspace.h> /* required by usbdrv.h */
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#include "usbdrv.h"
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#include "oddebug.h" /* This is also an example for using debug macros */
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#include "requests.h" /* The custom request numbers we use */
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#if TUNE_OSCCAL
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uchar lastTimer0Value;
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#endif
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#if CALIBRATE_OSCCAL
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#include "osccal.c"
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#endif
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/* ------------------------------------------------------------------------- */
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/* ----------------------------- USB interface ----------------------------- */
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/* ------------------------------------------------------------------------- */
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static uchar dataBuffer[64];
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static uchar writeIndex;
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uchar usbFunctionWrite(uchar *data, uchar len)
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{
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if(writeIndex + len <= sizeof(dataBuffer)){
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uchar i;
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for(i = 0; i < len; i++){
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dataBuffer[writeIndex++] = *data++;
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}
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}
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return writeIndex >= sizeof(dataBuffer);
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}
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usbMsgLen_t usbFunctionSetup(uchar data[8])
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{
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usbRequest_t *rq = (void *)data;
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DBG1(0x50, &rq->bRequest, 1); /* debug output: print our request */
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if(rq->bRequest == CUSTOM_RQ_SET_DATA){
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writeIndex = 0;
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return USB_NO_MSG;
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}else if(rq->bRequest == CUSTOM_RQ_GET_DATA){
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usbMsgPtr = dataBuffer; /* tell the driver which data to return */
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return sizeof(dataBuffer); /* tell the driver how many bytes to send */
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}else if(rq->bRequest == CUSTOM_RQ_SET_OSCCAL){
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OSCCAL = rq->wValue.bytes[0];
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}else if(rq->bRequest == CUSTOM_RQ_GET_OSCCAL){
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usbMsgPtr = (uchar *)&OSCCAL;
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return 1;
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}
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return 0; /* default for not implemented requests: return no data back to host */
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}
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/* ------------------------------------------------------------------------- */
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int __attribute__((noreturn)) main(void)
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{
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uchar i;
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wdt_enable(WDTO_1S);
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/* If you don't use the watchdog, replace the call above with a wdt_disable().
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* On newer devices, the status of the watchdog (on/off, period) is PRESERVED
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* OVER RESET!
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*/
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odDebugInit();
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DBG1(0x00, 0, 0); /* debug output: main starts */
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/* RESET status: all port bits are inputs without pull-up.
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* That's the way we need D+ and D-. Therefore we don't need any
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* additional hardware initialization.
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*/
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TCCR2 = 9 | (1 << COM20);
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OCR2 = 3; /* should give F_CPU/8 clock */
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DDRB = (1 << 2) | (1 << 3);
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TCCR0 = 3; /* 1/64 prescaler */
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usbInit();
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usbDeviceDisconnect(); /* enforce re-enumeration, do this while interrupts are disabled! */
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i = 0;
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while(--i){ /* fake USB disconnect for > 250 ms */
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wdt_reset();
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_delay_ms(1);
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}
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usbDeviceConnect();
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sei();
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DBG1(0x01, 0, 0); /* debug output: main loop starts */
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for(;;){ /* main event loop */
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wdt_reset();
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usbPoll();
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cli(); /* disable interrupts for some cycles, use other cli as nop */
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cli();
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cli();
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cli();
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cli();
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cli();
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cli();
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cli();
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cli();
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cli();
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cli();
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cli();
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cli();
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cli();
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sei();
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}
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}
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/* ------------------------------------------------------------------------- */
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