#include "core.h"

void setup() {
  init_port_F();
}

void loop() {
  char shifting = 0, x_1 = 0x08;
  unsigned char x_2 = 0x80;
  volatile long i;
  for (shifting = 0; shifting < 4; shifting++) {
    digital_write((x_1 >> shifting) + (x_2 >> shifting));
    for (i = 0; i < 200000; i++);
  }
}