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看门狗这里我就不多介绍了，能搜到这篇文章说明你了解

总之就是一个单片机重启程序，设定好超时时间，在超时时间内没有喂狗，单片机就会复位

主要应用在单片机异常重启方面，比如程序跑飞（注意程序跑飞时你就没有喂狗，然后就会重启单片机，注意看门狗独立于程序之外，看门狗不会随着程序跑飞）

1，cubeMX配置

1.打开看门狗，配置看门狗相关参数

我设置的超时时间为10s

超时时间=（预分频值*重载值）/时钟频率

10s=(256*1250)/32000

至于为什么是这样计算

IWDG时钟32000经过分频后为32000/256=125  也就是每秒计数125次

重载值reload value1250表示计数1250次内不喂狗就重启

所以超时时间=1250/125=10s

至于那个window value （有些芯片是没有这个值的）大家可以去了解了解WWDG窗口看门狗，也就是只能在窗口期喂狗

窗口期=window value/reload value *超时时间~超时时间

在上面例子 窗口期=600/1250*10~10s 

也就是4.8s~10s才能喂狗

不喂狗或者在4.8s之前喂狗都会复位单片机

（我用的是stm32l471rgt6芯片）看门狗时钟频率32kHz

2,打开串口1（可选）

为了调试方便

3.生成代码（基本配置默认你们都会）

勾选生成.c .h文件

我用的是clion开发，所以生成是STM32CubeIDE  用keil的就MDK就行

2.代码编写

就写喂狗函数就好了，初始化cubemx已经写好了

HAL_IWDG_Init(&hiwdg)//初始化
HAL_IWDG_Refresh(&hiwdg);//喂狗

main.c代码

/* USER CODE BEGIN Header */
/********************************************************************************* @file           : main.c* @brief          : Main program body******************************************************************************* @attention** Copyright (c) 2024 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 "can.h"
#include "iwdg.h"
#include "usart.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_CAN1_Init();MX_USART1_UART_Init();MX_USART2_UART_Init();MX_IWDG_Init();/* USER CODE BEGIN 2 */uint8_t rrr[6]="program begin";HAL_UART_Transmit(&huart1, rrr, 13, 1000);uint32_t time =HAL_GetTick();/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 *///每7秒喂狗    10s内不喂狗会重启if(HAL_GetTick()-time>7000){HAL_UART_Transmit(&huart1, "feed dog\r\n", 10, 1000);HAL_IWDG_Refresh(&hiwdg);time=HAL_GetTick();}HAL_UART_Transmit(&huart1, "loop\r\n", 6, 1000);HAL_Delay(1000);}/* USER CODE END 3 */
}/*** @brief System Clock Configuration* @retval None*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct = {0};RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};/** Configure the main internal regulator output voltage*/if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK){Error_Handler();}/** 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.LSIState = RCC_LSI_ON;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLM = 1;RCC_OscInitStruct.PLL.PLLN = 20;RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;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_DIV1;RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != 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 */

效果如下