void setup() {
  // put your setup code here, to run once:

volatile char*dirf;
dirf=0x30;
volatile char*outf;
outf=0x31;
*outf=0x01;

}

void loop() {
  // put your main code here, to run repeatedly:
char x;
  volatile long m;
volatile char*outf;
outf=0x31;

*outf=0x00;
for(m=0;m<100000;m++);
*outf=0x10;
  
}