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68 lines
2 KiB
C
68 lines
2 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "drivers/watchdog.h"
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#include "util/bitset.h"
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#include "system/logging.h"
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#define STM32F2_COMPATIBLE
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#define STM32F4_COMPATIBLE
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#define STM32F7_COMPATIBLE
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#include <mcu.h>
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#include <inttypes.h>
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void watchdog_init(void) {
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IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
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IWDG_SetPrescaler(IWDG_Prescaler_64); // ~8 seconds
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IWDG_SetReload(0xfff);
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IWDG_WriteAccessCmd(IWDG_WriteAccess_Disable);
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DBGMCU_APB1PeriphConfig(DBGMCU_IWDG_STOP, ENABLE);
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}
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void watchdog_start(void) {
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IWDG_Enable();
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watchdog_feed();
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}
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// This behaves differently from the bootloader and the firmware.
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void watchdog_feed(void) {
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IWDG_ReloadCounter();
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}
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bool watchdog_check_reset_flag(void) {
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return RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET;
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}
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McuRebootReason watchdog_clear_reset_flag(void) {
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McuRebootReason mcu_reboot_reason = {
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.brown_out_reset = (RCC_GetFlagStatus(RCC_FLAG_BORRST) != RESET),
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.pin_reset = (RCC_GetFlagStatus(RCC_FLAG_PINRST) != RESET),
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.power_on_reset = (RCC_GetFlagStatus(RCC_FLAG_PORRST) != RESET),
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.software_reset = (RCC_GetFlagStatus(RCC_FLAG_SFTRST) != RESET),
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.independent_watchdog_reset = (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET),
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.window_watchdog_reset = (RCC_GetFlagStatus(RCC_FLAG_WWDGRST) != RESET),
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.low_power_manager_reset = (RCC_GetFlagStatus(RCC_FLAG_LPWRRST) != RESET)
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};
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RCC_ClearFlag();
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return mcu_reboot_reason;
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}
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