165 lines
6.6 KiB
C
165 lines
6.6 KiB
C
/* Name: main.c
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* Project: hid-mouse, a very simple HID 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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We use VID/PID 0x046D/0xC00E which is taken from a Logitech mouse. Don't
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publish any hardware using these IDs! This is for demonstration only!
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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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/* ------------------------------------------------------------------------- */
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/* ----------------------------- USB interface ----------------------------- */
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/* ------------------------------------------------------------------------- */
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PROGMEM const char usbHidReportDescriptor[52] = { /* USB report descriptor, size must match usbconfig.h */
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0x05, 0x01, // USAGE_PAGE (Generic Desktop)
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0x09, 0x02, // USAGE (Mouse)
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0xa1, 0x01, // COLLECTION (Application)
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0x09, 0x01, // USAGE (Pointer)
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0xA1, 0x00, // COLLECTION (Physical)
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0x05, 0x09, // USAGE_PAGE (Button)
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0x19, 0x01, // USAGE_MINIMUM
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0x29, 0x03, // USAGE_MAXIMUM
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0x15, 0x00, // LOGICAL_MINIMUM (0)
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0x25, 0x01, // LOGICAL_MAXIMUM (1)
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0x95, 0x03, // REPORT_COUNT (3)
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0x75, 0x01, // REPORT_SIZE (1)
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0x81, 0x02, // INPUT (Data,Var,Abs)
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0x95, 0x01, // REPORT_COUNT (1)
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0x75, 0x05, // REPORT_SIZE (5)
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0x81, 0x03, // INPUT (Const,Var,Abs)
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0x05, 0x01, // USAGE_PAGE (Generic Desktop)
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0x09, 0x30, // USAGE (X)
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0x09, 0x31, // USAGE (Y)
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0x09, 0x38, // USAGE (Wheel)
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0x15, 0x81, // LOGICAL_MINIMUM (-127)
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0x25, 0x7F, // LOGICAL_MAXIMUM (127)
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0x75, 0x08, // REPORT_SIZE (8)
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0x95, 0x03, // REPORT_COUNT (3)
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0x81, 0x06, // INPUT (Data,Var,Rel)
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0xC0, // END_COLLECTION
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0xC0, // END COLLECTION
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};
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/* This is the same report descriptor as seen in a Logitech mouse. The data
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* described by this descriptor consists of 4 bytes:
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* . . . . . B2 B1 B0 .... one byte with mouse button states
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* X7 X6 X5 X4 X3 X2 X1 X0 .... 8 bit signed relative coordinate x
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* Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 .... 8 bit signed relative coordinate y
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* W7 W6 W5 W4 W3 W2 W1 W0 .... 8 bit signed relative coordinate wheel
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*/
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typedef struct{
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uchar buttonMask;
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char dx;
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char dy;
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char dWheel;
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}report_t;
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static report_t reportBuffer;
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static int sinus = 7 << 6, cosinus = 0;
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static uchar idleRate; /* repeat rate for keyboards, never used for mice */
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/* The following function advances sin/cos by a fixed angle
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* and stores the difference to the previous coordinates in the report
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* descriptor.
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* The algorithm is the simulation of a second order differential equation.
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*/
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static void advanceCircleByFixedAngle(void)
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{
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char d;
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#define DIVIDE_BY_64(val) (val + (val > 0 ? 32 : -32)) >> 6 /* rounding divide */
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reportBuffer.dx = d = DIVIDE_BY_64(cosinus);
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sinus += d;
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reportBuffer.dy = d = DIVIDE_BY_64(sinus);
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cosinus -= d;
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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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/* The following requests are never used. But since they are required by
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* the specification, we implement them in this example.
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*/
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if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){ /* class request type */
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DBG1(0x50, &rq->bRequest, 1); /* debug output: print our request */
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if(rq->bRequest == USBRQ_HID_GET_REPORT){ /* wValue: ReportType (highbyte), ReportID (lowbyte) */
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/* we only have one report type, so don't look at wValue */
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usbMsgPtr = (void *)&reportBuffer;
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return sizeof(reportBuffer);
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}else if(rq->bRequest == USBRQ_HID_GET_IDLE){
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usbMsgPtr = &idleRate;
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return 1;
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}else if(rq->bRequest == USBRQ_HID_SET_IDLE){
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idleRate = rq->wValue.bytes[1];
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}
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}else{
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/* no vendor specific requests implemented */
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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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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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if(usbInterruptIsReady()){
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/* called after every poll of the interrupt endpoint */
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advanceCircleByFixedAngle();
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DBG1(0x03, 0, 0); /* debug output: interrupt report prepared */
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usbSetInterrupt((void *)&reportBuffer, sizeof(reportBuffer));
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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