void setup() {
  // put your setup code here, to run once:
  volatile char *dirf,*dirk;
  volatile char *outf,*ink,x;
  dirf = 0x30;dirk=0x107;
  outf = 0x31;ink=0x106;
  *dirf = 0x01;*dirk = 0x00;
  while(1){
    x=*ink;
    if((x & 0x01)==0x01){ // switch pressed or not
      *outf=0x01; //led on
    }
    else{
      *outf=0x00; //led off
    }
  }
}

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

}