watchdog.h
#ifndef WATCHDOG_H
#define WATCHDOG_H

#include "Marlin.h"

#ifdef USE_WATCHDOG
  // intialise watch dog with a 1 sec interrupt time
  void watchdog_init();
  // pad the dog/reset watchdog. MUST be called at least every second after the first watchdog_init or avr will go into emergency procedures..
  void watchdog_reset();
#else
  //If we do not have a watchdog, then we can have empty functions which are optimized away.
  FORCE_INLINE void watchdog_init() {};
  FORCE_INLINE void watchdog_reset() {};
#endif

#endif