muele-marlin/Marlin/src/HAL/HAL_STM32F1/watchdog_Stm32f1.h

/**
 * 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/>.
 *
 */

/**
 * HAL for stm32duino.com based on Libmaple and compatible (STM32F1)
 */

#ifndef WATCHDOG_STM32F1_H
#define WATCHDOG_STM32F1_H

#include <libmaple/iwdg.h>

#include "../../inc/MarlinConfig.h"

/**
 *  The watchdog clock is 40Khz. We need a 4 seconds interval, so use a /256 preescaler and
 *  625 reload value (counts down to 0)
 *  use 1250 for 8 seconds
 */
#define STM32F1_WD_RELOAD 625

// Arduino STM32F1 core now has watchdog support

// Initialize watchdog with a 4 second countdown time
void watchdog_init();

// Reset watchdog. MUST be called at least every 4 seconds after the
// first watchdog_init or STM32F1 will reset.
inline void watchdog_reset() {
  #if PIN_EXISTS(LED)
    TOGGLE(LED_PIN);  // heart beat indicator
  #endif
  iwdg_feed();
}

#endif // WATCHDOG_STM32F1_H