126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
#include <util/delay.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/wdt.h>
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#include <avr/eeprom.h>
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#include <avr/pgmspace.h> /* required by usbdrv.h */
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#include "usbdrv/usbdrv.h"
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/* ------------------------------------------------------------------------- */
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/* ----------------------------- USB interface ----------------------------- */
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/* ------------------------------------------------------------------------- */
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PROGMEM const char usbHidReportDescriptor[22] = { /* USB report descriptor */
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0x06, 0x00, 0xff, // USAGE_PAGE (Generic Desktop)
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0x09, 0x01, // USAGE (Vendor Usage 1)
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0xa1, 0x01, // COLLECTION (Application)
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0x15, 0x00, // LOGICAL_MINIMUM (0)
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0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255)
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0x75, 0x08, // REPORT_SIZE (8)
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0x95, 0x80, // REPORT_COUNT (128)
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0x09, 0x00, // USAGE (Undefined)
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0xb2, 0x02, 0x01, // FEATURE (Data,Var,Abs,Buf)
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0xc0 // END_COLLECTION
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};
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/* Since we define only one feature report, we don't use report-IDs (which
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* would be the first byte of the report). The entire report consists of 128
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* opaque data bytes.
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*/
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/* The following variables store the status of the current data transfer */
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static uchar currentAddress;
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static uchar bytesRemaining;
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/* ------------------------------------------------------------------------- */
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/* usbFunctionRead() is called when the host requests a chunk of data from
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* the device. For more information see the documentation in usbdrv/usbdrv.h.
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*/
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uchar usbFunctionRead(uchar *data, uchar len)
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{
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if(len > bytesRemaining)
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len = bytesRemaining;
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eeprom_read_block(data, (uchar *)0 + currentAddress, len);
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currentAddress += len;
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bytesRemaining -= len;
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return len;
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}
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/* usbFunctionWrite() is called when the host sends a chunk of data to the
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* device. For more information see the documentation in usbdrv/usbdrv.h.
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*/
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uchar usbFunctionWrite(uchar *data, uchar len)
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{
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if(bytesRemaining == 0)
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return 1; /* end of transfer */
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if(len > bytesRemaining)
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len = bytesRemaining;
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eeprom_write_block(data, (uchar *)0 + currentAddress, len);
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currentAddress += len;
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bytesRemaining -= len;
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return bytesRemaining == 0; /* return 1 if this was the last chunk */
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}
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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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if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){ /* HID class request */
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if(rq->bRequest == USBRQ_HID_GET_REPORT){ /* wValue: ReportType (highbyte), ReportID (lowbyte) */
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/* since we have only one report type, we can ignore the report-ID */
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bytesRemaining = 128;
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currentAddress = 0;
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return USB_NO_MSG; /* use usbFunctionRead() to obtain data */
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}else if(rq->bRequest == USBRQ_HID_SET_REPORT){
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/* since we have only one report type, we can ignore the report-ID */
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bytesRemaining = 128;
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currentAddress = 0;
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return USB_NO_MSG; /* use usbFunctionWrite() to receive data from host */
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}
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}else{
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/* ignore vendor type requests, we don't use any */
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}
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return 0;
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}
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/* ------------------------------------------------------------------------- */
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void setupLed() {
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DDRB |= 1;
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PORTB &= ~1; // turn led off initially
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}
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void toggleLed() {
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PORTB ^= 1;
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}
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int main() {
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uchar i;
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setupLed();
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wdt_enable(WDTO_1S); // enable 1s watchdog timer
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usbInit();
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usbDeviceDisconnect(); // enforce re-enumeration
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toggleLed();
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for(i = 0; i<250; i++) {
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wdt_reset(); // keep watchdog happy
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_delay_ms(1);
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}
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toggleLed();
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usbDeviceConnect();
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sei();
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while(1) {
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wdt_reset();
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usbPoll();
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}
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return 0;
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}
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