void setup() {
  // put your setup code here, to run once:
volatile char *dirf;
volatile char *outf;
  dirf=0x30;
outf=0x31;
  *dirf=0x01;
  while(1)
  {
     // for(long long i=0;i<100000;i++)

  *outf=0x01;
  for(long long i=0;i<100000;i++)
  *outf=0x01;
    for(long long i=0;i<100000;i++)

  *outf=0x02;
        for(long long i=0;i<100000;i++)



  *outf=0x04;



}
}



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

  
      





}