165 lines
6.7 KiB
C
165 lines
6.7 KiB
C
/* 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 790 2010-05-30 21:00:26Z 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 __attribute__((noreturn)) 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!
|
|
*/
|
|
/* 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();
|
|
DBG1(0x00, 0, 0); /* debug output: main starts */
|
|
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));
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|