142 lines
5.2 KiB
C
142 lines
5.2 KiB
C
/* Name: main.c
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* Project: hid-data, example how to use HID for data transfer
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* Author: Christian Starkjohann
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* Creation Date: 2008-04-11
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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/eeprom.h>
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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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/* ------------------------------------------------------------------------- */
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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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int 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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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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return 0;
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}
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/* ------------------------------------------------------------------------- */
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