pios_reset.c

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/*
 * 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/>
 */


/* Project Includes */
#include "pios.h"

#include "pios_reset.h"

void PIOS_RESET_Clear()
{
    RCC_ClearFlag();
}

int16_t PIOS_RESET_GetResetReason (void)
{
        uint8_t reboot_reason = PIOS_RESET_FLAG_UNDEFINED;
        
        // ****************************************************** //
        // The order of these checks is important. DO NOT CHANGE. //
        // ****************************************************** //
        if(RCC_GetFlagStatus(RCC_FLAG_PORRST) == SET) {         // Check #1
                reboot_reason = PIOS_RESET_FLAG_POWERON;
        } else if(RCC_GetFlagStatus(RCC_FLAG_SFTRST) == SET) {  // Check #2
                reboot_reason = PIOS_RESET_FLAG_SOFTWARE;
        } else if(RCC_GetFlagStatus(RCC_FLAG_IWDGRST) == SET) { // Check #3
                reboot_reason = PIOS_RESET_FLAG_INDEPENDENT_WATCHDOG;
        } else if(RCC_GetFlagStatus(RCC_FLAG_WWDGRST) == SET) { // Check #4
                reboot_reason = PIOS_RESET_FLAG_WINDOW_WATCHDOG;
        } else if(RCC_GetFlagStatus(RCC_FLAG_LPWRRST) == SET) { // Check #5
                reboot_reason = PIOS_RESET_FLAG_LOW_POWER;
        } else if(RCC_GetFlagStatus(RCC_FLAG_PINRST) == SET) {  // Check #6. This MUST be last. This because the reset circuit works internally by triggering the NRST pin. See STM32 RCC docs.
                reboot_reason = PIOS_RESET_FLAG_PIN;
        }

        return reboot_reason;
}