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79 pfowler 1 
#include <avr/io.h>
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#include <avr/wdt.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include <util/delay.h>
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#include "usbdrv.h"
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#include "config.h"
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#ifndef NULL
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#define NULL    ((void *)0)
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#endif
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#define USB_GET_LED_STATE  100
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#define USB_SET_LED_STATE  101
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/* ------------------------------------------------------------------------- */
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uint8_t getKey(void);
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void doButtons(uint8_t);
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inline void setLeds(uint8_t);
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struct {
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	int16_t axis[2];
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	uint8_t buttons;
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} reportBuffer;
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volatile struct {
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	uint8_t buttons;
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	uint8_t waitup;
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	uint8_t timer;
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} debounce;
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uint8_t currleds = 1;
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static uchar    idleRate;           /* in 4 ms units */
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volatile uint8_t tmr0_ovf = 0;
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volatile uint32_t systime = 0;
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/* ------------------------------------------------------------------------- */
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const PROGMEM char usbHidReportDescriptor[USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH] = { /* USB report descriptor */
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    0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)
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    0x09, 0x05,                    // USAGE (Game Pad)
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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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    0x09, 0x30,                    //     USAGE (X)
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    0x09, 0x31,                    //     USAGE (Y)
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    0x16, 0x00, 0x80,		   //	  Log Min -32768
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    0x26, 0xff, 0x7f,		   //	  Log max 32768
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    0x75, 0x10,                    //     REPORT_SIZE (16)
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    0x95, 0x02,                    //     REPORT_COUNT (2)
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    0x81, 0x02,                    //     INPUT (Data,Var,Abs)
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    0x05, 0x09,                    //     USAGE_PAGE (Button)
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    0x19, 0x01,                    //     USAGE_MINIMUM (Button 1)
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    0x29, 0x08,                    //     USAGE_MAXIMUM (Button 8)
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    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
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    0x25, 0x01,                    //     LOGICAL_MAXIMUM (1)
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    0x75, 0x01,                    //     REPORT_SIZE (1)
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    0x95, 0x08,                    //     REPORT_COUNT (2)
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    0x81, 0x02,                    //     INPUT (Data,Var,Abs)
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    0xc0,                          //   END_COLLECTION
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    0xc0                           // END_COLLECTION
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};
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void hadUsbReset(void) {
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}
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uchar	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){
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        switch (rq->bRequest ) {
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		case USBRQ_HID_GET_REPORT:
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			return sizeof(reportBuffer);
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		case USBRQ_HID_GET_IDLE:
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			usbMsgPtr = &idleRate;
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			return 1;
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		case USBRQ_HID_SET_IDLE:
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			idleRate = rq->wValue.bytes[1];
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			return 0;
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		case USB_GET_LED_STATE: // send data to PC
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			usbMsgPtr = currleds;
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			return sizeof(currleds);
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		case USB_SET_LED_STATE: // modify reply buffer
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			//currleds = rq->wValue.bytes[0];
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			//currleds = rq->wIndex.bytes[0];
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			currleds = 0xaa;
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			return 0;
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        }
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    //}else{
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    //}
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	return 0;
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}
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void usbSendHidReport(uchar * data, uchar len) {
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	usbSetInterrupt(data, len);
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}
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/*
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void usbSendHidReport(uchar * data, uchar len) {
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        while(1)
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        {
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                usbPoll();
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                if (usbInterruptIsReady())
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                {
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                        usbSetInterrupt(data, len);
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                        break;
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                }
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        }
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}
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*/
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int main(void) {
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	DIDR0 = 0x00;
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  /*
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  DDR : 1 = Output, 0 = Input
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  PORT: 1 = Pullup for Input, otherwise set output
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  PIN : Read input pin
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  */
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  /*
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        PB0     - Output                - LED 3
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        PB1     - Output                - LED 4
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        PB2     - Output                - LED 5
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        PB3     - Output                - LED 6
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        PB4     - Output                - LED 7
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        PB5     -
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        PB6     -
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        PB7     -
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  */
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  DDRB          = 0B00011111;
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  PORTB         = 0B00000000;
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  /*
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        PC0     - Output		- ButtonPad Gnd0
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        PC1     - Output		- ButtonPad Gnd1
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        PC2     - Input, Pullup		- ButtonPad 0
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        PC3     - Input, Pullup		- ButtonPad 1
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        PC4     - Input, Pullup		- ButtonPad 2
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        PC5     - Input, Pullup		- ButtonPad 3
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  */
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  DDRC          = 0B00000011;
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  PORTC         = 0B00111111;
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  /*
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        PD0     -
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        PD1     -
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        PD2     -
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        PD3     -
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        PD4     -
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        PD5     - Output		- LED 0
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        PD6     - Output		- LED 1
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        PD7     - Output		- LED 2
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  */
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  DDRD          = 0B11100000;
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  PORTD         = 0B00000000;
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	setLeds(0xff);
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    usbDeviceDisconnect();
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    _delay_ms(500);
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    usbDeviceConnect();
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    TIMSK0 = (1<<TOIE0);                    // Enable timer overflow
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    TCNT0 = 0x00;                           // Set Timer0 initial value to 0
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    TCCR0B = (1<< CS00) ;                   // /1 prescaler
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    wdt_enable(WDTO_1S);
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    usbInit();
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    sei();
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    reportBuffer.axis[0] = 0xfffd;
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    reportBuffer.axis[1] = 0xfffd;
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    reportBuffer.buttons = 0x00;
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	setLeds(currleds);
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    for(;;){
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        wdt_reset();
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        usbPoll();
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	uint8_t pressed = getKey();
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	//doButtons(pressed);
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	setLeds(currleds);
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        if(usbInterruptIsReady()){
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                reportBuffer.buttons = pressed;
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		usbSendHidReport(&reportBuffer, sizeof(reportBuffer));
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        }
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    }
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    return 0;
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}
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inline void setLeds(uint8_t leds) {
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	PORTB &= 0xE0;
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        PORTB |= (0x1F & (leds >> 3));
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	PORTD &= 0x1F;
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        PORTD |= (0xE0 & (leds << 5));
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}
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void doButtons(uint8_t pressed) {
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        // Deboucing
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        // When i key first goes down, wait 5 ms, check it again to see if its still down
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        if (pressed && debounce.buttons == 0 && debounce.timer == 0) {
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                debounce.buttons = pressed;
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                debounce.timer = 5;
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        }
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        // The key has come up
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        if (pressed != debounce.buttons) {
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                debounce.buttons = 0;
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                debounce.timer = 0;
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                debounce.waitup = 0;
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        }
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        // Debounce timer is up, process our button
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        if (debounce.buttons && debounce.timer == 0 && debounce.waitup != 1) {
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                uint8_t i = 0;
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                for (i=0; i<=7; i++) {
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                        // Button pressed and the led is currently on
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                        if ( rbi(debounce.buttons, i) == 1 && rbi(currleds, i) == 1 ) {
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                                if ( i == 0 && rbi(currleds, 1) != 1)  //Dont turn off com1 if no comm2
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                                        break;
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                                if ( i == 1 && rbi(currleds, 0) != 1)  //Dont turn off com2 if no comm1
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                                        break;
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244 
                                cbi(currleds, i);
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                        // Button is pressed and led is currently off
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                         } else if ( rbi(debounce.buttons, i) == 1 && rbi(currleds, i) == 0 ) {
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                                if ( i == 0 && rbi(currleds, 1) == 1)  //Turn on comm2, turn off comm1
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                                        cbi(currleds,1);
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                                if ( i == 1 && rbi(currleds, 0) == 1)  //Turn on comm1, turn off comm2
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                                        cbi(currleds,0);
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                                sbi(currleds, i);
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                        }
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                }
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                setLeds(currleds);
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                debounce.waitup = 1;
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        }
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}
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// Gnd = PC0, PC1
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// Btn = PC2, PC3, PC4, PC5
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uint8_t getKey() {
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        uint8_t key = 0;
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        cbi(PORTC, 1);
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        _delay_us(10);        // Wait for the port change
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        if (rbi(PINC, 2) == 0) key = 1;
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        if (rbi(PINC, 3) == 0) key = 2;
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        if (rbi(PINC, 4) == 0) key = 4;
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        if (rbi(PINC, 5) == 0) key = 8;
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        sbi(PORTC, 1);
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        cbi(PORTC, 0);
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        _delay_us(10);
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        if (rbi(PINC, 2) == 0) key = 16;
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        if (rbi(PINC, 3) == 0) key = 32;
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        if (rbi(PINC, 4) == 0) key = 64;
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        if (rbi(PINC, 5) == 0) key = 128;
86 pfowler 280 
        sbi(PORTC, 0);
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282 
        return key;
79 pfowler 283 
}
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ISR(TIMER0_OVF_vect) {
287 
        tmr0_ovf++;
84 pfowler 288 
 
87 pfowler 289 
	// Clk/1 TCCR0B = (1<< CS00);
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	//20.0Mhz, 1ms = 78ovf
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	//16.5Mhz, 1ms = 64ovf
85 pfowler 292 
	//12.0Mhz, 1ms = 46ovf
84 pfowler 293 
 
87 pfowler 294 
        if (tmr0_ovf>=78) {
79 pfowler 295 
                systime++;
296 
                tmr0_ovf = 0;
84 pfowler 297 
 
298 
		if (debounce.timer != 0)
299 
			debounce.timer--;
79 pfowler 300 
        }
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}