#include <avr/eeprom.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <inttypes.h>
#include <avr/wdt.h>


int main(void);
volatile unsigned char flash;

//*************************************************************************************************

ISR(TIMER2_OVF_vect)
{
	flash++;
}

ISR(EE_READY_vect)
{
	PORTC |=_BV(PC0);	// We should never be here
	while(1);			// LED off and hang
}

//*************************************************************************************************

int main(void)
{
	SFIOR |=_BV(PUD);	// disable all pullups
	wdt_disable();		// disable watchdog timer

	// Initial port states
	PORTA = 0;
	PORTB = 0;
	PORTC = 0xFF;	// leds off on stk500
	PORTD = 0;
	PORTE = 0;
	PORTF = 0;

	// Setup port directions
	DDRA |=0xFF;		// PA all outputs
	DDRB |=0xFF;		// PB all outputs
	DDRC |=0xFF;		// PC all outputs
	DDRD |=0xFF;		// PD all outputs
	DDRE |=0xFF;		// PE all outputs
	DDRF |=0xFF;		// PF all outputs

	//Setup timer 0
	// Setup timer 2
	TCCR2 |= _BV(WGM20);	// phase correct pwm
	TCCR2 |= _BV(COM21);	
	TCCR2 |= _BV(CS20);		// Clock at fosc

	// enable timer int's
	TIMSK |= _BV(TOIE2);	// timer 2 overflow int enable	

	sei();					// enable global interrupts

	// blink once
	PORTC &=~_BV(PC0);		// LED on
	flash=1;
	while(flash);			// wait a bit

	// read eeprom
	cli();
	flash=eeprom_read_byte(0);
	sei();

	// flash fast
	while(1)
	{
		if(flash & 0x80)
			PORTC |=_BV(PC0);
		else
			PORTC &=~_BV(PC0);
	};
	return 0;
}