blink-4b.c

#include <avr/io.h>

#define F_CPU 16000000
#include <util/delay.h>

int main (void)
{
  DDRD = 0x01;   /* 00000001 */
  PORTD = 0x03;  /* 00000011 */
  while (1)
    ;  /* just wait */
  return 0;
}