Software Debounce in C code

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byte xdata RAW_IO_ADDRESS _at_ 0x7FF0
unsigned char reentrant Debounce_Key(void) {
  unsigned char i, key_debounced;
  /********************************************************/
  /* Software Debounce code in C                          */
  /* Debounce keys (20 to 100 milliseconds) from the IO   */
  /* If we are using a 25 Mhz 8051, then 20 loops would be*/
  /* about 30 milliseconds). Key debounce software.       */
  /********************************************************/
  key_debounced = RAW_IO_ADDRESS;

  for (i=0; i<20; i++) {

    key_debounced = key_debounced & RAW_IO_ADDRESS;
  }
   

   

  return(Key_Debounced);
}

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