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#define F_CPU 12000000L
#include <avr/io.h>
#include <avr/delay.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include "usbdrv/usbdrv.h"
PROGMEM const 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;
report_t reportBuffer;
/* device is detected, however unreliably. dunno why. */
void debug(int i)
{
if (i >= 63) i=63;
PORTB = ~i;
}
USB_PUBLIC uchar usbFunctionSetup(uchar data[8])
{
usbRequest_t* rq = (usbRequest_t*) data;
if ((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS &&
(rq->bRequest == USBRQ_HID_GET_REPORT))
{
debug(32);
// wValue: ReportType (highbyte), ReportID (lowbyte)
usbMsgPtr = (void *)&reportBuffer; // we only have this one
return sizeof(reportBuffer);
}
return 0;
}
int main (void)
{
char rand=123;
DDRC=0x00;
PORTC=0x00;
DDRB=0xFF;
wdt_enable(WDTO_1S);
usbInit();
usbDeviceDisconnect();
for (int i=0;i<100;i++)
{
PORTB=~i;
wdt_reset();
_delay_ms(5);
}
usbDeviceConnect();
PORTB=~42;
sei();
debug(4);
while(1)
{
wdt_reset();
usbPoll();
if(usbInterruptIsReady()) { // if the interrupt is ready, feed data
// pseudo-random sequence generator, thanks to Dan Frederiksen @AVRfreaks
// http://en.wikipedia.org/wiki/Linear_congruential_generator
rand=(rand*109+89)%251;
// move to a random direction
reportBuffer.dx = (rand&0xf)-8;
reportBuffer.dy = ((rand&0xf0)>>4)-8;
usbSetInterrupt((void *)&reportBuffer, sizeof(reportBuffer));
debug(2);
}
}
return 0; // never reached
}
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