Marlin_Firmware/Marlin/src/HAL/HAL_AVR/watchdog_AVR.cpp

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/**
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* Marlin 3D Printer Firmware
* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef __AVR__
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#include "../../inc/MarlinConfig.h"
#if ENABLED(USE_WATCHDOG)
#include "watchdog_AVR.h"
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#include "../../Marlin.h"
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// Initialize watchdog with 8s timeout, if possible. Otherwise, make it 4s.
void watchdog_init() {
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#if ENABLED(WATCHDOG_DURATION_8S) && defined(WDTO_8S)
#define WDTO_NS WDTO_8S
#else
#define WDTO_NS WDTO_4S
#endif
#if ENABLED(WATCHDOG_RESET_MANUAL)
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// We enable the watchdog timer, but only for the interrupt.
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// Take care, as this requires the correct order of operation, with interrupts disabled.
// See the datasheet of any AVR chip for details.
wdt_reset();
cli();
_WD_CONTROL_REG = _BV(_WD_CHANGE_BIT) | _BV(WDE);
_WD_CONTROL_REG = _BV(WDIE) | (WDTO_NS & 0x07) | ((WDTO_NS & 0x08) << 2); // WDTO_NS directly does not work. bit 0-2 are consecutive in the register but the highest value bit is at bit 5
// So worked for up to WDTO_2S
sei();
wdt_reset();
#else
wdt_enable(WDTO_NS); // The function handles the upper bit correct.
#endif
//delay(10000); // test it!
}
//===========================================================================
//=================================== ISR ===================================
//===========================================================================
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// Watchdog timer interrupt, called if main program blocks >4sec and manual reset is enabled.
#if ENABLED(WATCHDOG_RESET_MANUAL)
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ISR(WDT_vect) {
sei(); // With the interrupt driven serial we need to allow interrupts.
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SERIAL_ERROR_START();
SERIAL_ERRORLNPGM("Watchdog barked, please turn off the printer.");
kill(PSTR("ERR:Watchdog")); //kill blocks //up to 16 characters so it fits on a 16x2 display
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while (1); //wait for user or serial reset
}
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#endif // WATCHDOG_RESET_MANUAL
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#endif // USE_WATCHDOG
#endif // __AVR__