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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 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__
-
- #include "../../inc/MarlinConfig.h"
-
- #if ENABLED(USE_WATCHDOG)
-
- #include "watchdog.h"
-
- #include "../../MarlinCore.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)
- // 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_MSG(STR_WATCHDOG_FIRED);
- minkill(); // interrupt-safe final kill and infinite loop
- }
- #endif
-
- #endif // USE_WATCHDOG
- #endif // __AVR__
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