/** * 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/>. * */ #include "Marlin.h" #if ENABLED(USE_WATCHDOG) #include "watchdog.h" // Initialize watchdog with 8s timeout, if possible. Otherwise, make it 4s. void watchdog_init() { #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) // 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(); 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 =================================== //=========================================================================== // Watchdog timer interrupt, called if main program blocks >4sec and manual reset is enabled. #if ENABLED(WATCHDOG_RESET_MANUAL) ISR(WDT_vect) { sei(); // With the interrupt driven serial we need to allow interrupts. 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 while (1); //wait for user or serial reset } #endif // WATCHDOG_RESET_MANUAL #endif // USE_WATCHDOG