void setup() {
  // put your setup code here, to run once:
  volatile char *dirf, *dirk;
  volatile long i,j,x;
  dirf = 0x30;
  *dirf = 0x00;
  dirk = 0x107;
  *dirk = 0x03;
  volatile char *inf,*outk;
  inf = 0x2f;  outk = 0x108;
  i=0;
  while(1)
  { 
    x=*inf;
    if((x & 0x01) == 0x01)
    {
       i++;
       for (j=0; j<200000; j++);
       //while ((x & 0x01) == 1);
       }
       if (i%2)
    *outk = 0x01;
    else 
    *outk = 0x02;
}
  }
 
  





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

}