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1.实验目的：实现KEY1/LEY2/KE3三个按键，中断触发打印一句话，并且灯的状态取反；

key1 ----> LED3灯状态取反；

key2 ----> LED2灯状态取反；

key3 ----> LED1灯状态取反；

2.分析框图:

 3.代码：

---key.h头文件---

#ifndef __KEY_H__
#define __KEY_H__#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"typedef enum
{FALLING_TRI,  //下降沿触发方式RISING_TRI,  //上升沿触发方式
}trigger_t;//中断RCC章节初始化 PF9 7 8
void hal_interrupt_rcc_init();//EXTI初始化函数
//EXTI编号 GPIO组号 触发方式
void hal_exti_init(unsigned int extix,unsigned int groupx,trigger_t trix);//GIC初始化函数
//中断号，中断优先级
void hal_gic_init(unsigned int interruptx,unsigned int priority);//led初始化函数
void led_init(gpio_t* gpiox,unsigned int pin);#endif

---key.c函数实现---

#include "key.h"//中断RCC章节初始化 PF9 7 8
void hal_interrupt_rcc_init()
{//RCC章节初始化 PF9 [5]=1RCC->MP_AHB4ENSETR |= (0x1 << 5);}//EXTI初始化函数
//EXTI编号 GPIO组号 触发方式
void hal_exti_init(unsigned int extix,unsigned int groupx,trigger_t trix)
{//GPIO章节初始化 设置三个按键为输入模式GPIOF->MODER &= (~(0x3 << 2*extix));//EXTI章节初始化,引脚信号与EXTI连接//1.EXIT_EXTICR组 0x05EXTI->EXTICR[extix/4] &= (~(0xff << ((extix%4)*8)));EXTI->EXTICR[extix/4] |= (groupx << ((extix%4)*8));//2.EXTI_FTSR1 设置下降沿触发方式if(trix == FALLING_TRI)EXTI->FTSR1 |= (0x1 << extix);elseEXTI->RTSR1 |= (0x1 << extix);//3.EXTI_IMR1 设置中断不屏蔽 =1EXTI->C1IMR1 |= (0x1 << extix);}//GIC初始化函数
//中断号，中断优先级
void hal_gic_init(unsigned int interruptx,unsigned int priority)
{//GICD初始化//1.GICD_CTRL 使能组0 [0]=1GICD->CTRL |= (0x1 << 0);//2.GICD_ISENABLER组 设置GICD层中断使能GICD->ISENABLER[interruptx/32] |= (0x1 << (interruptx % 32));//3.GICD_IPRIORITYR组 设置中断优先级  操作高5位GICD->IPRIORITYR[interruptx/4] &= (~(0x1f << (interruptx % 4 * 8 + 3)));GICD->IPRIORITYR[interruptx/4] |= (priority << (interruptx % 4  * 8 + 3));//4.GICD_ITARGETSR组 设置中断目标分配给CPU0GICD->ITARGETSR[interruptx/4] &= (~(0x3 << (interruptx % 4 * 8)));GICD->ITARGETSR[interruptx/4] |= (0x1 << (interruptx % 4 * 8));//GICC初始化//1.GICC_CTRL 设置GICC层组0使能 [0]=1GICC->CTRL |= (0x1 << 0);//2.GICC_PMR 设置GICC层中断优先级 GICC->PMR |= ((priority+1) << 3);
}//led灯初始化
//参数1：GPIO组号
//参数2：引脚编号
void led_init(gpio_t* gpiox,unsigned int pin)
{//1输出模式 gpiox->MODER &= ~(0x3 << (pin*2));gpiox->MODER |= (0x1 << (pin*2));//2输出类型gpiox->OTYPER &= (~(0x1 << pin));//3输出速率gpiox->OSPEEDR &= ~(0x3 << (pin*2));//4拉电阻gpiox->PUPDR &= ~(0x3 << (pin*2));
}

---do_irq.c终端处理函数---

#include "key.h"extern void printf(const char *fmt, ...);//中断处理函数
void do_irq(void) 
{//1获取中断号 IAR[9:0]unsigned int num = 0;num = GICC->IAR & 0x3ff;//2判断中断号，并且打印一句话switch(num){case 99:printf("KEY1按键中断,LED3灯取反\n");//led3灯状态取反GPIOE->ODR ^= (0x1 << 8);//3清除EXTI层中断挂起标志位 [9]=1//EXTI_FDR1 [9]=1EXTI->FPR1 |= (0x1 << 9);//4清除GICD层中断挂起标志位//GICD_ICPENDR3 [3]=1GICD->ICPENDR[3] |= (0x1 << 3);break;case 97:printf("KEY2按键中断，LED2灯取反\n");//led2灯状态取反GPIOF->ODR ^= (0x1 << 10);//清除EXTI层中断挂起标志位 [9]=1EXTI->FPR1 |= (0x1 << 7);GICD->ICPENDR[3] |= (0x1 << 1);break;case 98:printf("KEY3按键中断，LED1灯取反\n");	//led1灯状态取反GPIOE->ODR ^= (0x1 << 10);EXTI->FPR1 |= (0x1 << 8);GICD->ICPENDR[3] |= (0x1 << 2);break;}//5清楚获取到的中断号GICC->EOIR = num;}

---main.c测试文件---

#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++);
}#define GPIO_PIN10 10  //引脚编号
#define GPIO_PIN8 8
#define EXTI9 9   //EXTI编号
#define EXTI7 7
#define EXTI8 8
#define GPIOF_GROUP 0x05   //GPIOF组号
#define KEY1_ID 99   //中断号
#define KEY2_ID 97
#define KEY3_ID 98
#define KEY1_PRIORITY 9   //中断优先级
#define KEY2_PRIORITY 7
#define KEY3_PRIORITY 8int main()
{//使能三盏灯PE10 PF10 PE8RCC->MP_AHB4ENSETR |= (0x3 << 4);//led初始化函数led_init(GPIOE,GPIO_PIN10);led_init(GPIOF,GPIO_PIN10);led_init(GPIOE,GPIO_PIN8);//中断RCC章节初始化 PF9 7 8hal_interrupt_rcc_init();//EXTI初始化函数hal_exti_init(EXTI9,GPIOF_GROUP,FALLING_TRI);hal_exti_init(EXTI7,GPIOF_GROUP,FALLING_TRI);hal_exti_init(EXTI8,GPIOF_GROUP,FALLING_TRI);//GIC初始化函数hal_gic_init(KEY1_ID,KEY1_PRIORITY);hal_gic_init(KEY2_ID,KEY2_PRIORITY);hal_gic_init(KEY3_ID,KEY3_PRIORITY);while(1){}return 0;}

4.实验现象：