Marlin_Firmware/Marlin/watchdog.cpp

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#include "Marlin.h"
#if ENABLED(USE_WATCHDOG)
#include "watchdog.h"
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// Initialize watchdog with a 4 sec interrupt time
void watchdog_init() {
#if ENABLED(WATCHDOG_RESET_MANUAL)
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// We enable the watchdog timer, but only for the interrupt.
// Take care, as this requires the correct order of operation, with interrupts disabled. See the datasheet of any AVR chip for details.
wdt_reset();
_WD_CONTROL_REG = _BV(_WD_CHANGE_BIT) | _BV(WDE);
_WD_CONTROL_REG = _BV(WDIE) | WDTO_4S;
#else
wdt_enable(WDTO_4S);
#endif
}
//===========================================================================
//=================================== ISR ===================================
//===========================================================================
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// Watchdog timer interrupt, called if main program blocks >1sec and manual reset is enabled.
#if ENABLED(WATCHDOG_RESET_MANUAL)
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ISR(WDT_vect) {
SERIAL_ERROR_START;
SERIAL_ERRORLNPGM("Something is wrong, please turn off the printer.");
kill(PSTR("ERR:Please Reset")); //kill blocks //16 characters so it fits on a 16x2 display
while (1); //wait for user or serial reset
}
#endif //WATCHDOG_RESET_MANUAL
#endif //USE_WATCHDOG