/********************************************************************************
						Includes
********************************************************************************/
#include <avr/io.h>
#include <stdbool.h>
#include <util/delay.h>

/********************************************************************************
						Main
********************************************************************************/
int main(void) {
	uint8_t value = 0;
	// configure PORTA as output
	DDRA = 0xFF;
	// main loop
	while (true) {
		// turn on every other bit on PORTA, pattern 10101010
		PORTA = ~value++;
		_delay_ms(1000);
	} 
}