2022-11-30 ARM 用按键中断的实现_按键中断初始化函数,按键中断服务函数-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_62323204/article/details/128123703

该代码实现了一个基于STM32MP1xx微处理器的中断系统配置，包括EXTI、GICD和GICC层的初始化，用于处理KEY1、KEY2和KEY3三个按键的中断事件。当按键被按下时，系统会延迟一段时间并打印相应的按键标识，然后清除中断标志。

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1.头文件

#ifndef __KEY__H__
#define __KEY__H__ 
 
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gic.h"
 
/*******KEY1----->PF9*******/
//初始化EXTI层
void pf9_exti_init();
//初始化GICD层
void pf9_gicd_init();
//初始化GICC层
void pf9_gicc_init();
 
/*******KEY2----->PF7*******/
//初始化EXTI层
void pf7_exti_init();
//初始化GICD层
void pf7_gicd_init();
//初始化GICC层
void pf7_gicc_init();
 
 
/*******KEY3----->PF8*******/
//初始化EXTI层
void pf8_exti_init();
//初始化GICD层
void pf8_gicd_init();
//初始化GICC层
void pf8_gicc_init();
 
 
 
#endif

2.功能函数

#include "key.h"
/*******KEY1----->PF9*******/
//初始化EXTI层
void pf9_exti_init()
{
	/***********RCC***********/	
	//使能GPIOF控制器
	RCC->MP_AHB4ENSETR |= (0x1 << 5);
	/***********GPIO**********/	
	//将模式设置为输入模式
	GPIOF->MODER &= (~(0x3 << 18));
	/**********EXTI**********/
	//1.中断选择寄存器
	EXTI->EXTICR3 |= (0x05 << 8);
	//2.中断屏蔽寄存器
	EXTI->C1IMR1 |= (0x1 << 9);
	//3.检测方式下降沿
	EXTI->FTSR1 |= (0x1 << 9);
 
}
//初始化GICD层
void pf9_gicd_init()
{
	/**********GICD**********/
	//1.总使能
	GICD->CTRL |= 0x1;
	//2.中断设置使能寄存器
	GICD->ISENABLER[3] |= (0x1 << 3);
	//3,中断优先级寄存器
	GICD->IPRIORITYR[24] |= (0x1 << 27);
	//4.中断处理器选择寄存器
	GICD->ITARGETSR[24] |= (0x1 << 24);
}
//初始化GICC层
void pf9_gicc_init()
{
	/*********GICC***********/
	//1.使能
	GICC->CTRL |= (0x1 << 0);
	//2.优先级
	GICC->PMR |= (0x2 << 3);
}
 
/*******KEY2----->PF7*******/
//初始化EXTI层
void pf7_exti_init()
{
	/***********RCC***********/	
	//使能GPIOF控制器
	RCC->MP_AHB4ENSETR |= (0x1 << 5);
	/***********GPIO**********/	
	//将模式设置为输入模式
	GPIOF->MODER &= (~(0x3 << 14));
	/**********EXTI**********/
	//1.中断选择寄存器
	EXTI->EXTICR2 |= (0x05 << 24);
	//2.中断屏蔽寄存器
	EXTI->C1IMR1 |= (0x1 << 7);
	//3.检测方式下降沿
	EXTI->FTSR1 |= (0x1 << 7);
 
}
//初始化GICD层
void pf7_gicd_init()
{
	/**********GICD**********/
	//1.总使能
	GICD->CTRL |= 0x1;
	//2.中断设置使能寄存器
	GICD->ISENABLER[3] |= (0x1 << 1);
	//3,中断优先级寄存器
	GICD->IPRIORITYR[24] |= (0x1 << 11);
	//4.中断处理器选择寄存器
	GICD->ITARGETSR[24] |= (0x1 << 8);
}
//初始化GICC层
void pf7_gicc_init()
{
	/*********GICC***********/
	//1.使能
	GICC->CTRL |= (0x1 << 0);
	//2.优先级
	GICC->PMR |= (0x2 << 3);
}
 
/*******KEY3----->PF8*******/
//初始化EXTI层
void pf8_exti_init()
{
	/***********RCC***********/	
	//使能GPIOF控制器
	RCC->MP_AHB4ENSETR |= (0x1 << 5);
	/***********GPIO**********/	
	//将模式设置为输入模式
	GPIOF->MODER &= (~(0x3 << 16));
	/**********EXTI**********/
	//1.中断选择寄存器
	EXTI->EXTICR3 |= (0x05 << 0);
	//2.中断屏蔽寄存器
	EXTI->C1IMR1 |= (0x1 << 8);
	//3.检测方式下降沿
	EXTI->FTSR1 |= (0x1 << 8);
 
}
//初始化GICD层
void pf8_gicd_init()
{
	/**********GICD**********/
	//1.总使能
	GICD->CTRL |= 0x1;
	//2.中断设置使能寄存器
	GICD->ISENABLER[3] |= (0x1 << 2);
	//3,中断优先级寄存器
	GICD->IPRIORITYR[24] |= (0x1 << 19);
	//4.中断处理器选择寄存器
	GICD->ITARGETSR[24] |= (0x1 << 16);
}
//初始化GICC层
void pf8_gicc_init()
{
	/*********GICC***********/
	//1.使能
	GICC->CTRL |= (0x1 << 0);
	//2.优先级
	GICC->PMR |= (0x2 << 3);
}

3.中断函数

#include "key.h"
extern void delay_ms(int ms);
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
	unsigned int num = 0;
	//获取中断号
	num = GICC->IAR & 0x3ff;
	switch(num)
	{
	case 97:           //key2
		delay_ms(500);
		printf("key2#########\n");
		//清除EXTI中断挂起标志
		EXTI->FPR1 |= (0x1 << 7);
		//清除GICD中断挂起标志位
		GICD->ICPENDR[3] |= (0x1 << 1);
		break;
	case 98: 		   //key3
		delay_ms(500);
		printf("key3#########\n");
		//清除EXTI中断挂起标志
		EXTI->FPR1 |= (0x1 << 8);
		//清除GICD中断挂起标志位
		GICD->ICPENDR[3] |= (0x1 << 2);
		break;
	case 99:           //key1
		delay_ms(500);
		printf("key1#########\n");
 
		//清除EXTI中断挂起标志
		EXTI->FPR1 |= (0x1 << 9);
		//清除GICD中断挂起标志位
		GICD->ICPENDR[3] |= (0x1 << 3);
		break;
	}
	//清除中断号
	GICC->EOIR &= (~0x3ff);
	GICC->EOIR |= num;
}

4.测试函数

#include "key.h"
extern void printf(const char *fmt, ...);
void delay_ms(int ms)                 
{
	int i,j;
	for(i = 0; i < ms;i++)
		for (j = 0; j < 1800; j++);
}


int main()
{
	//1.EXTI初始化
	pf9_exti_init();
	//2.GICD初始化
	pf9_gicd_init();
	//3.GICC初始化
	pf9_gicc_init();

	//1.EXTI初始化
	pf7_exti_init();
	//2.GICD初始化
	pf7_gicd_init();
	//3.GICC初始化
	pf7_gicc_init();

	//1.EXTI初始化
	pf8_exti_init();
	//2.GICD初始化
	pf8_gicd_init();
	//3.GICC初始化
	pf8_gicc_init();
	while(1)
	{

	}
	return 0;
}

5.现象展示