void setup() {
  volatile char *portF,*outF;
  volatile long i;
  portF=0x30;outF=0x31;
  *portF=0x01;
  while(1){
   *outF=0x55;
  for(i=0;i<600000;i++);
}
}

void loop() {
  // put your main code here, to run repeatedly:

}