[嵌入式]【STM32】独立看门狗 IWDG 实验代码详解

main.c

#include "led.h"
#include "delay.h"
#include "sys.h"
#include "key.h"
#include "usart.h"
#include "iwdg.h"

int main(void)
{	
	delay_init();				//延时函数初始化	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// 设置中断优先级分组2 
	uart_init(9600);	 		//串口初始化为9600
	LED_Init();		  	 		//初始化与LED连接的硬件接口 
	KEY_Init();          		//按键初始化	 
	delay_ms(300);   	 		//让人看得到灭
	IWDG_Init(4,625);    		//与分频数为64,重载值为625,溢出时间为1s	   
	LED0=0;				 		//点亮LED0
	while(1)
	{
		if(KEY_Scan(0)==WKUP_PRES)IWDG_Feed();//如果WK_UP按下,则喂狗
		delay_ms(10);
	};
}

iwdg.c

#include "iwdg.h"
#include "led.h"

void IWDG_Init(u8 prer,u16 rlr) 
{	
 	IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);  //使能对寄存器IWDG_PR和IWDG_RLR的写操作
	
	IWDG_SetPrescaler(prer);  //设置IWDG预分频值:设置IWDG预分频值为64
	
	IWDG_SetReload(rlr);  //设置IWDG重装载值
	
	IWDG_ReloadCounter();  //按照IWDG重装载寄存器的值重装载IWDG计数器
	
	IWDG_Enable();  //使能IWDG
}
//喂独立看门狗
void IWDG_Feed(void)
{   
 	IWDG_ReloadCounter();										   
}

iwdg.h

#ifndef __WDG_H
#define __WDG_H
#include "sys.h"

void IWDG_Init(u8 prer,u16 rlr);
void IWDG_Feed(void);

#endif