void setup() {
  // put your setup code here, to run once:
  volatile char *dirk,*dirf,x,i;
  volatile long j;
  volatile char *out,*ink;
  dirf=0x30; dirk=0x107;
  out=0x31;  ink=0x106;
  *dirf=0x01; *dirk=0x00;
  i=0;
  while(1){
    x= *ink; 
    if((x & 0x01) == 0x01){
      i++;
      for(j=0;j<100000;j++);// debouncing we put delay here
    }
    if((i%2)==0){
        *out=0x01;
      }
      else{
        *out=0x02;
      }
  }
}

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

}