void setup() {
  // put your setup code here, to run once:
  volatile char *dirf;
  volatile char *outf;
  dirf=0x30;
  outf=0x31;
  *dirf=0x01;
  // *outf=0x01;
  // *outf=0x00;
}

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

}