#include "main.h"

void setup() {
 volatile char *portf_dir = (char*)0x30;
 *portf_dir = 0xff;

}

void loop() {
  volatile char *portf_out = (char*)0x31;
  volatile char x;
  volatile long i;
  
  for (i=0;i<100000;i++);
  for (x=0; x<4;x++) {
    *portf_out |= (1<<x);
    
    for (i=0;i<100000;i++);
    
  }
  
}