1. iwdg.c

#include "stm32f4xx.h"                  
#include "iwdg.h"
 
//prer：预分频值
//rlr：自动重装载值
void IWDG_Init(unsigned char prer,unsigned int rlr)//IWDG初始化
{
	IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);//取消写保护，方便后续调用寄存器
	IWDG_SetPrescaler(prer);//设置预分频值
	IWDG_SetReload(rlr);//设置重装载值
	IWDG_ReloadCounter();//把重装载寄存器rlr的值加载到KR寄存器中，进行看门狗喂狗
	IWDG_Enable();//看门狗使能
}
 
void IWDG_FEED(void)//看门狗喂狗
{
	IWDG_ReloadCounter();//往KR寄存器中写0xAAAA；
}

2. iwdg.h

#ifndef _IWDG__H_
#define _IWDG__H_
#include "sys.h"
 
void IWDG_Init(unsigned char prer,unsigned int rlr);
 
void IWDG_FEED(void);
#endif
 

3. main.c

IWDG_Init(4,500);//初始化看门狗喂狗  (4*2^4)*500/32=1000ms=1s 设置看门狗的溢出时间为1秒

IWDG_FEED();//喂狗

STM32F4_独立看门狗详解(IWDG)_stm32f4 看门狗_light_2025的博客-CSDN博客