98 lines
3.7 KiB
C
98 lines
3.7 KiB
C
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/* Name: main.c
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* Project: custom-class, a basic USB example
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* Author: Christian Starkjohann
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* Creation Date: 2008-04-09
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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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We assume that an LED is connected to port B bit 0. If you connect it to a
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different port or bit, change the macros below:
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*/
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#define LED_PORT_DDR DDRB
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#define LED_PORT_OUTPUT PORTB
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#define LED_BIT 0
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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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/* ------------------------------------------------------------------------- */
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/* ----------------------------- USB interface ----------------------------- */
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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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static uchar dataBuffer[4]; /* buffer must stay valid when usbFunctionSetup returns */
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if(rq->bRequest == CUSTOM_RQ_ECHO){ /* echo -- used for reliability tests */
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dataBuffer[0] = rq->wValue.bytes[0];
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dataBuffer[1] = rq->wValue.bytes[1];
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dataBuffer[2] = rq->wIndex.bytes[0];
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dataBuffer[3] = rq->wIndex.bytes[1];
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usbMsgPtr = dataBuffer; /* tell the driver which data to return */
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return 4;
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}else if(rq->bRequest == CUSTOM_RQ_SET_STATUS){
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if(rq->wValue.bytes[0] & 1){ /* set LED */
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LED_PORT_OUTPUT |= _BV(LED_BIT);
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}else{ /* clear LED */
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LED_PORT_OUTPUT &= ~_BV(LED_BIT);
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}
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}else if(rq->bRequest == CUSTOM_RQ_GET_STATUS){
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dataBuffer[0] = ((LED_PORT_OUTPUT & _BV(LED_BIT)) != 0);
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usbMsgPtr = dataBuffer; /* tell the driver which data to return */
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return 1; /* tell the driver to send 1 byte */
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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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/* 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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odDebugInit();
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DBG1(0x00, 0, 0); /* debug output: main starts */
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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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LED_PORT_DDR |= _BV(LED_BIT); /* make the LED bit an output */
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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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DBG1(0x02, 0, 0); /* debug output: main loop iterates */
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wdt_reset();
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usbPoll();
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}
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}
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/* ------------------------------------------------------------------------- */
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