void setup() {
  // put your setup code here, to run once:
volatile char*dirf;
volatile  char*outf;
dirf=0x31;
outf=0x30;
*dirf=0x01;
*outf=0x03;




}

void loop() {


    volatile long m;
volatile char*outf;
outf=0x31;
  *outf=0x00;
  for(m=0;m<100000;m++);
    *outf=0x01;

}