int main()
{
  volatile char *dir_f , *out_f;
  dir_f = 0x30;
  *dir_f = 0xff;
  out_f = 0x31;
  

  
  

  volatile char *dir_k , *input_k , x ;
  dir_k = 0x107;
  *dir_k =0x00;
  input_k = 0x106;
  volatile long t;

  volatile char *dir_port_a , *output_a;
   dir_port_a = 0x21;
   *dir_port_a = 0xff;
   output_a = 0x22;
   *output_a = 0xff;
  while(1)
  {
     x = *input_k;

     if((x & 0x01) == 0x01)
      {
         for(t = 0 ; t <50000; t++); //Debounce
          *out_f = 0x01;   
      }
    else
      *out_f = 0x00;
  }

return 0;

}