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- /* Name: main.c
- * Project: custom-class, a basic USB example
- * Author: Christian Starkjohann
- * Creation Date: 2008-04-09
- * Tabsize: 4
- * Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH
- * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
- * This Revision: $Id: main.c 692 2008-11-07 15:07:40Z cs $
- */
- /*
- This example should run on most AVRs with only little changes. No special
- hardware resources except INT0 are used. You may have to change usbconfig.h for
- different I/O pins for USB. Please note that USB D+ must be the INT0 pin, or
- at least be connected to INT0 as well.
- We assume that an LED is connected to port B bit 0. If you connect it to a
- different port or bit, change the macros below:
- */
- #define LED_PORT_DDR DDRB
- #define LED_PORT_OUTPUT PORTB
- #define LED_BIT 0
- #include <avr/io.h>
- #include <avr/wdt.h>
- #include <avr/interrupt.h> /* for sei() */
- #include <util/delay.h> /* for _delay_ms() */
- #include <avr/pgmspace.h> /* required by usbdrv.h */
- #include "usbdrv.h"
- #include "oddebug.h" /* This is also an example for using debug macros */
- #include "requests.h" /* The custom request numbers we use */
- /* ------------------------------------------------------------------------- */
- /* ----------------------------- USB interface ----------------------------- */
- /* ------------------------------------------------------------------------- */
- usbMsgLen_t usbFunctionSetup(uchar data[8])
- {
- usbRequest_t *rq = (void *)data;
- static uchar dataBuffer[4]; /* buffer must stay valid when usbFunctionSetup returns */
- if(rq->bRequest == CUSTOM_RQ_ECHO){ /* echo -- used for reliability tests */
- dataBuffer[0] = rq->wValue.bytes[0];
- dataBuffer[1] = rq->wValue.bytes[1];
- dataBuffer[2] = rq->wIndex.bytes[0];
- dataBuffer[3] = rq->wIndex.bytes[1];
- usbMsgPtr = dataBuffer; /* tell the driver which data to return */
- return 4;
- }else if(rq->bRequest == CUSTOM_RQ_SET_STATUS){
- if(rq->wValue.bytes[0] & 1){ /* set LED */
- LED_PORT_OUTPUT |= _BV(LED_BIT);
- }else{ /* clear LED */
- LED_PORT_OUTPUT &= ~_BV(LED_BIT);
- }
- }else if(rq->bRequest == CUSTOM_RQ_GET_STATUS){
- dataBuffer[0] = ((LED_PORT_OUTPUT & _BV(LED_BIT)) != 0);
- usbMsgPtr = dataBuffer; /* tell the driver which data to return */
- return 1; /* tell the driver to send 1 byte */
- }
- return 0; /* default for not implemented requests: return no data back to host */
- }
- /* ------------------------------------------------------------------------- */
- int main(void)
- {
- uchar i;
- wdt_enable(WDTO_1S);
- /* Even if you don't use the watchdog, turn it off here. On newer devices,
- * the status of the watchdog (on/off, period) is PRESERVED OVER RESET!
- */
- DBG1(0x00, 0, 0); /* debug output: main starts */
- /* RESET status: all port bits are inputs without pull-up.
- * That's the way we need D+ and D-. Therefore we don't need any
- * additional hardware initialization.
- */
- odDebugInit();
- usbInit();
- usbDeviceDisconnect(); /* enforce re-enumeration, do this while interrupts are disabled! */
- i = 0;
- while(--i){ /* fake USB disconnect for > 250 ms */
- wdt_reset();
- _delay_ms(1);
- }
- usbDeviceConnect();
- LED_PORT_DDR |= _BV(LED_BIT); /* make the LED bit an output */
- sei();
- DBG1(0x01, 0, 0); /* debug output: main loop starts */
- for(;;){ /* main event loop */
- DBG1(0x02, 0, 0); /* debug output: main loop iterates */
- wdt_reset();
- usbPoll();
- }
- return 0;
- }
- /* ------------------------------------------------------------------------- */
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