Marlin_Firmware/Marlin/watchdog.h

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#ifndef WATCHDOG_H
#define WATCHDOG_H
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#include "Marlin.h"
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#if ENABLED(USE_WATCHDOG)
// initialize 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
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#endif