void setup() {
  // put your setup code here, to run once:
  volatile char *dirf,*dirc;
  dirf=0x30;dirc=0x26;
  *dirf=0xFF;*dirc=0x00;
}

void loop() {
  // put your main code here, to run repeatedly:
  volatile char *outf,*inc,x;
  volatile long i=0,j;
  outf=0x31;inc=0x26;
  x=*inc;
  if(x!=0)
  {
     *outf=0x01;
    for(i=0;i<50000;i++);
    *outf=0x02;
    for(i=0;i<50000;i++);
    *outf=0x04;
    for(i=0;i<50000;i++);
    *outf=0x08;
    for(i=0;i<50000;i++);
    *outf=0x10;
    for(i=0;i<50000;i++);
    *outf=0x20;
    for(i=0;i<50000;i++);
     *outf=0x40;
    for(i=0;i<50000;i++);
    *outf=0x80;
    for(i=0;i<50000;i++);

  }
  else
  {
    *outf=0x00;
  }
   
}