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42 pfowler 1 
#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <avr/interrupt.h>
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#include <avr/wdt.h>
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#include "petelib.h"
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#include <util/delay.h>
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#include <stdlib.h>
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#include <string.h>
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#include "wire.h"
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#include "lcd.h"
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volatile uint8_t pcIntCurr[3] = {0,0,0};
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volatile uint8_t pcIntLast[3] = {0,0,0};
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volatile uint8_t pcIntMask[3] = {0,0,0};
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volatile uint8_t tmr0_ovf = 0;
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volatile uint16_t systime = 0;
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uint8_t analogRead(uint8_t);
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uint8_t emblock[] = {	0B00011111,
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			0B00010001,
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			0B00010001,
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			0B00010001,
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			0B00010001,
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			0B00010001,
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			0B00010001,
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			0B00011111 };
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int main(void) {
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  ACSR |= (1<<ACD); // Disable analog comparator
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  /*
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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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  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 		- Keypad 2
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	PB1	- Output 		- Keypad 7
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	PB2	- Output 		- Keypad 6
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	PB3	- Output 		- Keypad 4
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	PB4	- Input, Pullup		- Function select
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	PB5	- Input, Pullup		- Function select
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  */
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  DDRB		= 0B00001111;
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  PORTB 	= 0B00111111;
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  DDRC		= 0B00000000;
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  PORTC		= 0B00110000;
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  /*
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	PD0	- Output
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	PD1	- Input, Pullup, PCINT17	- Rotary 1b
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	PD4	- Output		- Keypad select status led
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	PD5	- Input, Pullup		- Keypad 3
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	PD6	- Input, Pullup		- Keypad 1
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	PD7	- Input, Pullup		- Keypad 5
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  */
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  DDRD		= 0B00010001;
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  PORTD		= 0B11100011;
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  PCMSK2 |= (( 1 << PCINT16 ) | ( 1 << PCINT17 )); //enable encoder pins interrupt sources
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  PCICR |= ( 1 << PCIE2 ); //enable pin change interupts
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  // Setup timer0 - Enable overflow, 8 times prescaler
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	TIMSK0 = (1<<TOIE0);			// Eable timer overflow for Timer0
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	TCNT0 = 0x00;				// Set Timer0 to 0
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	TCCR0B = (1<< CS01) ;			// /8 prescaler
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  sei();
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//	i2c_beginTransmission(0x27);
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//	i2c_writeByte(0x01);
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//	i2c_endTransmission(1);
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	i2c_master();
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	lcd_init();
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	lcd_createChar(0x00, emblock);
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  wdt_enable(WDTO_8S);
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	uint16_t oldsystime = systime;
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	uint8_t oldpotVal = -1;
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	char strTime[] = {'T', 'i', 'm', 'e', ':', 0x00};
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	lcd_setCursor(0, 1);
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	lcd_print(strTime);
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  for(;;) {
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    wdt_reset();
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	if (oldsystime != systime) {
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		oldsystime = systime;
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		char syschar[6];
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		itoa(systime, syschar, 10);
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		syschar[5] = 0x00;
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		lcd_overprint(syschar, 5, 6, 1);
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	uint8_t potVal = map_8(analogRead(0), 0, 255, 0, 100);
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	if (potVal != oldpotVal) {
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		lcd_pergraph(potVal, 0, 0);
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		oldpotVal = potVal;
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		char pot[3];
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		itoa(potVal, pot, 10);
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		lcd_overprint(pot, 3, 12, 0);
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		lcd_char(0x25);
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	}
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	}
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  }
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}
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uint8_t analogRead(uint8_t pin) {
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	ADMUX = (1<<ADLAR) | (1<<REFS0) | (0<<REFS1) | (pin & 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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/*
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 *
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 * Process the Pin Change Interrupt.
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 * pcint provides what bank caused the interrupt
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 *
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 */
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void doInt(uint8_t pcint) {
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	// Clear the mask so we know we've delth with it
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	pcIntMask[pcint] = 0;
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}
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ISR(TIMER0_OVF_vect) {
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	xbi(PORTD, PD4);
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	tmr0_ovf++;
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	if (tmr0_ovf>=58) {
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		xbi(PORTD, PD0);
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		systime++;
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		tmr0_ovf = 0;
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	}
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}
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ISR(PCINT1_vect)
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{
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        // Save the state and work out which pin caused
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        //  the interrupt to occur
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        pcIntCurr[1] = PIND;
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        pcIntMask[1] = pcIntCurr[1] ^ pcIntLast[1];
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        pcIntLast[1] = pcIntCurr[1];
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        doInt(1);
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}
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ISR(PCINT2_vect)
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{
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	// Save the state and work out which pin caused
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	//  the interrupt to occur
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	pcIntCurr[2] = PIND;
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	pcIntMask[2] = pcIntCurr[2] ^ pcIntLast[2];
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	pcIntLast[2] = pcIntCurr[2];
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	doInt(2);
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}
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