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