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- /* Name: main.c
- * Project: hid-mouse, a very simple HID example
- * Author: Christian Starkjohann
- * Creation Date: 2008-04-07
- * 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 use VID/PID 0x046D/0xC00E which is taken from a Logitech mouse. Don't
- publish any hardware using these IDs! This is for demonstration only!
- */
- #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 */
- /* ------------------------------------------------------------------------- */
- /* ----------------------------- USB interface ----------------------------- */
- /* ------------------------------------------------------------------------- */
- PROGMEM char usbHidReportDescriptor[52] = { /* USB report descriptor, size must match usbconfig.h */
- 0x05, 0x01, // USAGE_PAGE (Generic Desktop)
- 0x09, 0x02, // USAGE (Mouse)
- 0xa1, 0x01, // COLLECTION (Application)
- 0x09, 0x01, // USAGE (Pointer)
- 0xA1, 0x00, // COLLECTION (Physical)
- 0x05, 0x09, // USAGE_PAGE (Button)
- 0x19, 0x01, // USAGE_MINIMUM
- 0x29, 0x03, // USAGE_MAXIMUM
- 0x15, 0x00, // LOGICAL_MINIMUM (0)
- 0x25, 0x01, // LOGICAL_MAXIMUM (1)
- 0x95, 0x03, // REPORT_COUNT (3)
- 0x75, 0x01, // REPORT_SIZE (1)
- 0x81, 0x02, // INPUT (Data,Var,Abs)
- 0x95, 0x01, // REPORT_COUNT (1)
- 0x75, 0x05, // REPORT_SIZE (5)
- 0x81, 0x03, // INPUT (Const,Var,Abs)
- 0x05, 0x01, // USAGE_PAGE (Generic Desktop)
- 0x09, 0x30, // USAGE (X)
- 0x09, 0x31, // USAGE (Y)
- 0x09, 0x38, // USAGE (Wheel)
- 0x15, 0x81, // LOGICAL_MINIMUM (-127)
- 0x25, 0x7F, // LOGICAL_MAXIMUM (127)
- 0x75, 0x08, // REPORT_SIZE (8)
- 0x95, 0x03, // REPORT_COUNT (3)
- 0x81, 0x06, // INPUT (Data,Var,Rel)
- 0xC0, // END_COLLECTION
- 0xC0, // END COLLECTION
- };
- /* This is the same report descriptor as seen in a Logitech mouse. The data
- * described by this descriptor consists of 4 bytes:
- * . . . . . B2 B1 B0 .... one byte with mouse button states
- * X7 X6 X5 X4 X3 X2 X1 X0 .... 8 bit signed relative coordinate x
- * Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 .... 8 bit signed relative coordinate y
- * W7 W6 W5 W4 W3 W2 W1 W0 .... 8 bit signed relative coordinate wheel
- */
- typedef struct{
- uchar buttonMask;
- char dx;
- char dy;
- char dWheel;
- }report_t;
- static report_t reportBuffer;
- static int sinus = 7 << 6, cosinus = 0;
- static uchar idleRate; /* repeat rate for keyboards, never used for mice */
- /* The following function advances sin/cos by a fixed angle
- * and stores the difference to the previous coordinates in the report
- * descriptor.
- * The algorithm is the simulation of a second order differential equation.
- */
- static void advanceCircleByFixedAngle(void)
- {
- char d;
- #define DIVIDE_BY_64(val) (val + (val > 0 ? 32 : -32)) >> 6 /* rounding divide */
- reportBuffer.dx = d = DIVIDE_BY_64(cosinus);
- sinus += d;
- reportBuffer.dy = d = DIVIDE_BY_64(sinus);
- cosinus -= d;
- }
- /* ------------------------------------------------------------------------- */
- usbMsgLen_t usbFunctionSetup(uchar data[8])
- {
- usbRequest_t *rq = (void *)data;
- /* The following requests are never used. But since they are required by
- * the specification, we implement them in this example.
- */
- if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS){ /* class request type */
- DBG1(0x50, &rq->bRequest, 1); /* debug output: print our request */
- if(rq->bRequest == USBRQ_HID_GET_REPORT){ /* wValue: ReportType (highbyte), ReportID (lowbyte) */
- /* we only have one report type, so don't look at wValue */
- usbMsgPtr = (void *)&reportBuffer;
- return sizeof(reportBuffer);
- }else if(rq->bRequest == USBRQ_HID_GET_IDLE){
- usbMsgPtr = &idleRate;
- return 1;
- }else if(rq->bRequest == USBRQ_HID_SET_IDLE){
- idleRate = rq->wValue.bytes[1];
- }
- }else{
- /* no vendor specific requests implemented */
- }
- 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();
- 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();
- if(usbInterruptIsReady()){
- /* called after every poll of the interrupt endpoint */
- advanceCircleByFixedAngle();
- DBG1(0x03, 0, 0); /* debug output: interrupt report prepared */
- usbSetInterrupt((void *)&reportBuffer, sizeof(reportBuffer));
- }
- }
- return 0;
- }
- /* ------------------------------------------------------------------------- */
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