獨立看門狗（IWDG）

在規定時間內按按鍵喂狗并將LED關閉，若產生看門狗復位則LED打開

初始化獨立看門狗，在main.c中的?MX_IWDG_Init();，也就是iwdg.c中的初始化代碼

void MX_IWDG_Init(void)
{/* USER CODE BEGIN IWDG_Init 0 *//* USER CODE END IWDG_Init 0 *//* USER CODE BEGIN IWDG_Init 1 *//* USER CODE END IWDG_Init 1 */hiwdg.Instance = IWDG;hiwdg.Init.Prescaler = IWDG_PRESCALER_32;hiwdg.Init.Reload = 3749;if (HAL_IWDG_Init(&hiwdg) != HAL_OK){Error_Handler();}/* USER CODE BEGIN IWDG_Init 2 *//* USER CODE END IWDG_Init 2 */}

檢查是否設置RCC標志，獲取看門狗是否復位標志，在?stm32f1xx_hal_rcc.h 文件中

/** @brief  Check RCC flag is set or not.* @param  __FLAG__ specifies the flag to check.*          This parameter can be one of the following values:*            @arg @ref RCC_FLAG_HSIRDY HSI oscillator clock ready.*            @arg @ref RCC_FLAG_HSERDY HSE oscillator clock ready.*            @arg @ref RCC_FLAG_PLLRDY Main PLL clock ready.@if STM32F105xx*            @arg @ref RCC_FLAG_PLL2RDY Main PLL2 clock ready.*            @arg @ref RCC_FLAG_PLLI2SRDY Main PLLI2S clock ready.@elsif STM32F107xx*            @arg @ref RCC_FLAG_PLL2RDY Main PLL2 clock ready.*            @arg @ref RCC_FLAG_PLLI2SRDY Main PLLI2S clock ready.@endif*            @arg @ref RCC_FLAG_LSERDY LSE oscillator clock ready.*            @arg @ref RCC_FLAG_LSIRDY LSI oscillator clock ready.*            @arg @ref RCC_FLAG_PINRST  Pin reset.*            @arg @ref RCC_FLAG_PORRST  POR/PDR reset.*            @arg @ref RCC_FLAG_SFTRST  Software reset.*            @arg @ref RCC_FLAG_IWDGRST Independent Watchdog reset.*            @arg @ref RCC_FLAG_WWDGRST Window Watchdog reset.*            @arg @ref RCC_FLAG_LPWRRST Low Power reset.* @retval The new state of __FLAG__ (TRUE or FALSE).*/
#define __HAL_RCC_GET_FLAG(__FLAG__) (((((__FLAG__) >> 5U) == CR_REG_INDEX)?   RCC->CR   : \((((__FLAG__) >> 5U) == BDCR_REG_INDEX)? RCC->BDCR : \RCC->CSR)) & (1U << ((__FLAG__) & RCC_FLAG_MASK)))

stm32f1xx_hal.h中，獲取系統時間戳

uint32_t HAL_GetTick(void);

喂狗函數在?stm32f1xx_hal_iwdg.h 中

/* I/O operation functions ****************************************************/
HAL_StatusTypeDef     HAL_IWDG_Refresh(IWDG_HandleTypeDef *hiwdg);

業務邏輯代碼，按鍵觸發中斷，中斷中喂狗，喂狗關閉LED燈，看門狗觸發復位打開LED燈

Kye_EXTI.c

#include "stm32f1xx_hal.h"extern IWDG_HandleTypeDef hiwdg;
static uint32_t lastInterruptTime = 0;
#define DEBOUNCE_DELAY 10 // 消抖時間(ms)
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{if (GPIO_Pin == GPIO_PIN_4){uint32_t currentTime = HAL_GetTick();// 檢查是否在消抖時間內if ((currentTime - lastInterruptTime) >= DEBOUNCE_DELAY){if (HAL_GPIO_ReadPin(GPIOE,GPIO_PIN_4) == GPIO_PIN_RESET){HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_SET);HAL_IWDG_Refresh(&hiwdg);}lastInterruptTime = currentTime;}}
}

main.c

/* USER CODE BEGIN Header */
/********************************************************************************* @file           : main.c* @brief          : Main program body******************************************************************************* @attention** Copyright (c) 2025 STMicroelectronics.* All rights reserved.** This software is licensed under terms that can be found in the LICENSE file* in the root directory of this software component.* If no LICENSE file comes with this software, it is provided AS-IS.********************************************************************************/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "iwdg.h"
#include "gpio.h"/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes *//* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD *//* USER CODE END PTD *//* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD *//* USER CODE END PD *//* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM *//* USER CODE END PM *//* Private variables ---------------------------------------------------------*//* USER CODE BEGIN PV *//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP *//* USER CODE END PFP *//* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 *//* USER CODE END 0 *//*** @brief  The application entry point.* @retval int*/
int main(void)
{/* USER CODE BEGIN 1 *//* USER CODE END 1 *//* MCU Configuration--------------------------------------------------------*//* Reset of all peripherals, Initializes the Flash interface and the Systick. */HAL_Init();/* USER CODE BEGIN Init *//* USER CODE END Init *//* Configure the system clock */SystemClock_Config();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();MX_IWDG_Init();/* USER CODE BEGIN 2 *//* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */if (__HAL_RCC_GET_FLAG(RCC_FLAG_IWDGRST)){// 如果是看門狗復位，則翻轉LEDHAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_RESET);// 清除復位標志__HAL_RCC_CLEAR_RESET_FLAGS();}while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}/*** @brief System Clock Configuration* @retval None*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct = {0};RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};/** Initializes the RCC Oscillators according to the specified parameters* in the RCC_OscInitTypeDef structure.*/RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_HSE;RCC_OscInitStruct.HSEState = RCC_HSE_ON;RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;RCC_OscInitStruct.HSIState = RCC_HSI_ON;RCC_OscInitStruct.LSIState = RCC_LSI_ON;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK){Error_Handler();}/** Initializes the CPU, AHB and APB buses clocks*/RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK){Error_Handler();}
}/* USER CODE BEGIN 4 *//* USER CODE END 4 *//*** @brief  This function is executed in case of error occurrence.* @retval None*/
void Error_Handler(void)
{/* USER CODE BEGIN Error_Handler_Debug *//* User can add his own implementation to report the HAL error return state */__disable_irq();while (1){}/* USER CODE END Error_Handler_Debug */
}#ifdef USE_FULL_ASSERT
/*** @brief  Reports the name of the source file and the source line number*         where the assert_param error has occurred.* @param  file: pointer to the source file name* @param  line: assert_param error line source number* @retval None*/
void assert_failed(uint8_t *file, uint32_t line)
{/* USER CODE BEGIN 6 *//* User can add his own implementation to report the file name and line number,ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) *//* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */