#include <stdint.h>

#include <avr/io.h>

#define	F_CPU	1000000UL
#include <util/delay.h>


#define	LED	2	/* PD2 */


int main(void)
{
	DDRD = 1 << LED;
	while (1) {
		PORTD ^= 1 << LED;
		_delay_ms(50);
	}
}