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17 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_STATE  		100
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#define USB_LEDS_SET  		101
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#define USB_GET_ANALOG 		102
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#define USB_SET_POWER_LED	103
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/* ------------------------------------------------------------------------- */
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uint8_t getKey(void);
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inline void setLeds();
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void analogInit();
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uint8_t analogRead(uint8_t channel);
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/*
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volatile struct {
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	uint8_t data;
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	union {
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		uint8_t led_method:1;
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		uint8_t other:1;
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		uint8_t reserved:6;
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	};
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} config;*/
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static uchar usbReplyBuf[16];
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volatile uint8_t pwrLed = 0;
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volatile uint8_t currLeds = 0;
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volatile uint8_t currKeys = 0;
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volatile uint8_t analogPin = 0;
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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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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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        switch (rq->bRequest ) {
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		case USB_GET_STATE:
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			usbReplyBuf[0] = currLeds;
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			usbReplyBuf[1] = currKeys;
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			usbMsgPtr = usbReplyBuf;
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			return sizeof(usbReplyBuf);
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		case USB_LEDS_SET:
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			currLeds = rq->wValue.bytes[0];
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			return 0;
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		case USB_GET_ANALOG:
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			usbReplyBuf[0] = (analogPin);
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			usbMsgPtr = usbReplyBuf;
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			return sizeof(usbReplyBuf);
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		case USB_SET_POWER_LED:
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			pwrLed = rq->wValue.bytes[0];
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        }
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	return 0;
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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     - Input				- Config Switch 1
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        PB6     - Osc
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        PB7     - Osc
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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     - Input, ADC		- Potentiometer
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        PC1     - Output			- Power LED
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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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        PC6		- Reset
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  */
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  DDRC          = 0B00000010;
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  PORTC         = 0B00111100;
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  /*
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        PD0     - Output		- ButtonPad Gnd0
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        PD1     - Output		- ButtonPad Gnd1
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        PD2     - USB D+
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        PD3     - USB D-
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        PD4     - Input			- Config Switch 2
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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          = 0B11100011;
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  PORTD         = 0B00000011;
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	// The USB connect stuff, flash the power led
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  	sbi(PORTC, PC1);
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    usbDeviceDisconnect();
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    _delay_ms(500);
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    usbDeviceConnect();
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    cbi(PORTC, PC1);
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    // @TODO: Don't really need the system time anymore, remove?
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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);			// WatchDog at 1s
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    usbInit();						// Init the USB port
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    sei();							// Enable interrupts
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	setLeds();						// Set default LED status
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	analogInit();					// Init the ADC for PC0 (ADC0)
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    for(;;){
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        wdt_reset();
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        usbPoll();					// Poll USB port (Every ~10ms!)
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        currKeys = getKey();		// Check the button presses
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        analogPin = analogRead(0);	// Read the pot (VolControl)
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		setLeds();					// Set the leds
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									// @TODO: Only do this on change
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    }
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    return 0;
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}
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inline void setLeds() {
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	// Set the status leds.
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	// @TODO: Verify that this doesn't mess with other port functions
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	PORTB &= 0xE0;
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	PORTB |= (0x1F & (currLeds >> 3));
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	PORTD &= 0x1F;
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	PORTD |= (0xE0 & (currLeds << 5));
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	// Set the power led state
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	if (pwrLed)
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		sbi(PORTC, PC1);
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	else
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		cbi(PORTC, PC1);
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}
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// Gnd = PD0, PD1
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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(PORTD, PD1);		// Read the first row of buttons
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        _delay_us(10);			// Wait for the port change
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        if (rbi(PINC, PC2) == 0) key = 1;
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        if (rbi(PINC, PC3) == 0) key = 2;
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        if (rbi(PINC, PC4) == 0) key = 4;
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        if (rbi(PINC, PC5) == 0) key = 8;
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        sbi(PORTD, PD1);
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        cbi(PORTD, PD0);		// Read the second row of buttons
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        _delay_us(10);
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        if (rbi(PINC, PC2) == 0) key = 16;
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        if (rbi(PINC, PC3) == 0) key = 32;
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        if (rbi(PINC, PC4) == 0) key = 64;
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        if (rbi(PINC, PC5) == 0) key = 128;
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        sbi(PORTD, PD0);
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        return key;
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}
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18 pfowler 195 
uint8_t analogRead(uint8_t channel) {
196 
        ADMUX = (1<<ADLAR) | (1<<REFS0) | (0<<REFS1) | (channel & 0x0f);
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        ADCSRA |= (1<<ADSC);            	// Start converting
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        while (((ADCSRA >> ADSC) & 1)) {}   //Wait until conversion finished
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        uint8_t result = ADCH;
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        //ADCSRA |= (0<<ADSC);          	// Stop converting
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        return result;
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}
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206 
void analogInit() {
207 
	ACSR |= (1<<ACD); // Disable analog comparator
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209 
	/*
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        Setup ADC
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        ADMUX: 8 bit mode, Avcc ref
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        ADCSRA: Enable, 128 prescale
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	*/
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	ADMUX = (1<<ADLAR) | (0<<REFS0) | (1<<REFS1);
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	ADCSRA = (1<<ADEN) | (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0) ;
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}
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17 pfowler 218 
ISR(TIMER0_OVF_vect) {
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        tmr0_ovf++;
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	// Clk/1 TCCR0B = (1<< CS00);
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	//20.0Mhz, 1ms = 78ovf
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	//16.5Mhz, 1ms = 64ovf
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	//12.0Mhz, 1ms = 46ovf
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226 
        if (tmr0_ovf>=78) {
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                systime++;
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                tmr0_ovf = 0;
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        }
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}