[嵌入式]2022/9/17——基于stm32mp157的按键中断实验

1、key.h——头文件的包络和函数的声明

#ifndef __KEY_H__
#define __KEY_H__

#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_gpio.h"

//初始化EXTI层——key1
void pf9_exti_init();

//初始化GICD层——key1
void pf9_gicd_init();

//初始化GICC层——key1
void pf9_gicc_init();

//初始化EXTI层——key3
void pf8_exti_init();

//初始化GICD层——key3
void pf8_gicd_init();

//初始化GICC层——key3
void pf8_gicc_init();

//初始化EXTI层——key2
void pf7_exti_init();

//初始化GICD层——key2
void pf7_gicd_init();

//初始化GICC层——key2
void pf7_gicc_init();

#endif

2、key.c——功能函数的定义（以key1为例）

1）RCC章节初始化

    //1.设置GPIOF组时钟使能
	RCC->MP_AHB4ENSETR |= (0x1 << 5);

2）GPIO章节初始化

    //1.设置PF9引脚为输入模式
	GPIOF->MODER &= (~(0x3 << 18));

3）EXTI章节初始化

3.1设置PF9引脚和EXIT9控制器进行连接

	EXTI->EXTICR3 &= (~(0xff << 8));
	EXTI->EXTICR3 |= (0x5 << 8);

3.2设置PF9引脚检测方式为下降沿

EXTI->FTSR1 |= (0x1 << 9);

3.3设置PF9引脚中断不屏蔽

EXTI->C1IMR1 |= (0x1 << 9);

4）初始化GICD层

4.1设置GICD层全局中断使能寄存器

	GICD->CTRL |= (0x1 << 0);	

4.2设置GICD层中断使能寄存器

	GICD->ISENABLER[3] |= (0x1 << 3);

4.3设置GICD层中断优先级寄存器

	GICD->IPRIORITYR[24] &= (~(0x1f << 27));
	GICD->IPRIORITYR[24] |= (0x1 << 27);

4.4设置GICD层中断目标分配寄存器

	GICD->ITARGETSR[24] |= (0x3 << 24);

5）初始化GICC层

5.1设置GICC层全局中断使能寄存器

GICC->CTRL |= (0x1 << 0);

5.2设置GICC层中断优先级寄存器

	GICC->PMR &= (~(0x1f << 3));
	GICC->PMR |= (0x9 << 3);

6）完整代码

#include "key.h"

//初始化EXTI层——key1
void pf9_exti_init()
{
	/****RCC章节初始化*******/
	//1.设置GPIOF组时钟使能
	RCC->MP_AHB4ENSETR |= (0x1 << 5);
	/****GPIO章节初始化*******/
	//1.设置PF9引脚为输入模式
	GPIOF->MODER &= (~(0x3 << 18));
	/*****EXTI章节初始化******/
	//1.设置PF9引脚和EXIT9控制器进行连接
	EXTI->EXTICR3 &= (~(0xff << 8));
	EXTI->EXTICR3 |= (0x5 << 8);
	//2.设置PF9引脚检测方式下降沿
	EXTI->FTSR1 |= (0x1 << 9);
	//3.设置PF9引脚中断不屏蔽
	EXTI->C1IMR1 |= (0x1 << 9);
}

//初始化GICD层——key1
void pf9_gicd_init()
{
	//1.设置GICD层全局中断使能寄存器
	GICD->CTRL |= (0x1 << 0);	
	//2.设置GICD层中断使能寄存器
	GICD->ISENABLER[3] |= (0x1 << 3);
	//3.设置GICD层中断优先级寄存器
	GICD->IPRIORITYR[24] &= (~(0x1f << 27));
	GICD->IPRIORITYR[24] |= (0x1 << 27);
	//4.设置GICD层中断目标分配寄存器
	GICD->ITARGETSR[24] |= (0x3 << 24);
}

//初始化GICC层——key1
void pf9_gicc_init()
{
	//1.设置GICC层全局中断使能寄存器
	GICC->CTRL |= (0x1 << 0);
	//2.设置GICC层中断优先级寄存器
	GICC->PMR &= (~(0x1f << 3));
	GICC->PMR |= (0x9 << 3);
}

//初始化EXTI层——key3
void pf8_exti_init()
{
	/****GPIO章节初始化*******/
	//1.设置PF8引脚为输入模式
	GPIOF->MODER &= (~(0x3 << 16));
	/*****EXTI章节初始化******/
	//1.设置PF8引脚和EXIT8控制器进行连接
	EXTI->EXTICR3 &= (~(0xff << 0));
	EXTI->EXTICR3 |= (0x5 << 0);
	//2.设置PF8引脚检测方式下降沿
	EXTI->FTSR1 |= (0x1 << 8);
	//3.设置PF8引脚中断不屏蔽
	EXTI->C1IMR1 |= (0x1 << 8);
}

//初始化GICD层——key3
void pf8_gicd_init()
{
	//1.设置GICD层全局中断使能寄存器
	GICD->CTRL |= (0x1 << 0);	
	//2.设置GICD层中断使能寄存器
	GICD->ISENABLER[3] |= (0x1 << 2);
	//3.设置GICD层中断优先级寄存器
	GICD->IPRIORITYR[24] &= (~(0x1f << 19));
	GICD->IPRIORITYR[24] |= (0x3 << 19);
	//4.设置GICD层中断目标分配寄存器
	GICD->ITARGETSR[24] |= (0x3 << 16);
}

//初始化GICC层——key3
void pf8_gicc_init()
{
	//1.设置GICC层全局中断使能寄存器
	GICC->CTRL |= (0x1 << 0);
	//2.设置GICC层中断优先级寄存器
	GICC->PMR &= (~(0x1f << 3));
	GICC->PMR |= (0x8 << 3);
}

//初始化EXTI层——key2
void pf7_exti_init()
{
	/****GPIO章节初始化*******/
	//1.设置PF7引脚为输入模式
	GPIOF->MODER &= (~(0x3 << 14));
	/*****EXTI章节初始化******/
	//1.设置PF7引脚和EXIT7控制器进行连接
	EXTI->EXTICR2 &= (~(0xff << 24));
	EXTI->EXTICR2 |= (0x5 << 24);
	//2.设置PF7引脚检测方式下降沿
	EXTI->FTSR1 |= (0x1 << 7);
	//3.设置PF7引脚中断不屏蔽
	EXTI->C1IMR1 |= (0x1 << 7);
}

//初始化GICD层——key2
void pf7_gicd_init()
{
	//1.设置GICD层全局中断使能寄存器
	GICD->CTRL |= (0x1 << 0);	
	//2.设置GICD层中断使能寄存器
	GICD->ISENABLER[3] |= (0x1 << 1);
	//3.设置GICD层中断优先级寄存器
	GICD->IPRIORITYR[24] &= (~(0x1f << 11));
	GICD->IPRIORITYR[24] |= (0x2 << 11);
	//4.设置GICD层中断目标分配寄存器
	GICD->ITARGETSR[24] |= (0x3 << 8);
}

//初始化GICC层——key2
void pf7_gicc_init()
{
	//1.设置GICC层全局中断使能寄存器
	GICC->CTRL |= (0x1 << 0);
	//2.设置GICC层中断优先级寄存器
	GICC->PMR &= (~(0x1f << 3));
	GICC->PMR |= (0x7 << 3);
}

3、do_irq.c——中断处理函数

使用延时函数进行去抖

#include "key.h"
extern void printf(const char *fmt, ...);
extern void delay_ms(int ms);

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

4、main.c——延时函数的定义和初始化函数的调用

#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()
{
	/******key1初始化*****/
	//初始化EXTI层
	pf9_exti_init();
	//初始化GICD层
	pf9_gicd_init();
	//初始化GICC层
	pf9_gicc_init();
	/******key3初始化*****/
	//初始化EXTI层
	pf8_exti_init();
	//初始化GICD层
	pf8_gicd_init();
	//初始化GICC层
	pf8_gicc_init();
	/******key3初始化*****/
	//初始化EXTI层
	pf7_exti_init();
	//初始化GICD层
	pf7_gicd_init();
	//初始化GICC层
	pf7_gicc_init();
	while(1)
	{

	}
	return 0;
}

5、实验现象

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