#include <avr/io.h>
#include <util/delay.h>

int main()
{
	//setup
	// Button on PB2
	// LED on PA3
	// LED on PA7
	PORTB = _BV(PB2); // set B2 pull up on (default is input)
	DDRA = _BV(PA3) | _BV(PA7);  // set A3 and A7 as output for LED
	
	char lightOn = 0;
	
	//Loop
	while (TRUE)
	{		
		// check if button is pressed
		if(bit_is_clear(PINB,PB2))        
		{
			// wait until the button is let go 
			while(bit_is_clear(PINB, PB2))
			{
				lightOn = lightOn;
			}
			
			// alternate between the two light on and light off states
			if(lightOn == 0)
			{
				lightOn = 1;
			}
			else 
			{
				lightOn = 0;
			}
		}
		
		if(lightOn == 0)
		{
			PORTA |= _BV(PA3) | _BV(PA7);
		}
		else if (lightOn == 1)
		{
			PORTA = 0;
		}
		
		//delay for debouncing
		//wait 50 ms between successive switches so that one button press is not accidentally read as multiple presses
		_delay_ms(50);
		
	}

}