src/key_it.c

#include "key_it.h"
#include "led.h"
void key_it_config()
{
	//RCC使能GPIOF时钟
	RCC->MP_AHB4ENSETR |= (0x1<<5);
	//设置PF9 PF7 PF8GPIO输入
	//PF9
	GPIOF->MODER &= (~(0x3<<18));
	//PF8
	GPIOF->MODER &= (~(0x3<<16));
	//PF7
	GPIOF->MODER &= (~(0x3<<14));
	//设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx
	//PF7
	EXTI->EXTICR2 &= (~(0xFF<<24));
	EXTI->EXTICR2 |= (0x5<<24);
	//PF8
	EXTI->EXTICR3 &= (~(0xFF<<0));
	EXTI->EXTICR3 |= (0x5<<0);
	//PF9
	EXTI->EXTICR3 &= (~(0xFF<<8));
	EXTI->EXTICR3 |= (0x5<<8);
	//设置事件触发方式为下降沿触发EXTI_FTSR1
	//PF7
	EXTI->FTSR1 |= (0x1<<7);
	//PF8
	EXTI->FTSR1 |= (0x1<<8);
	//PF9
	EXTI->FTSR1 |= (0x1<<9);
	//设置EXTI事件触发不屏蔽EXTI_IMR1
	//PF7
	EXTI->C1IMR1 |= (0x1<<7);
	//PF8
	EXTI->C1IMR1 |= (0x1<<8);
	//PF9
	EXTI->C1IMR1 |= (0x1<<9);
	//使能组0转发中断GICD_CTLR
	GICC->CTRL |= 0x1;
	//使能中断能转发到待定的CPU接口层GICD_ISENABLERx
	//PF7 97中断
	GICD->ISENABLER[3] |= (0x1<<1);
	//PF7 98中断
	GICD->ISENABLER[3] |= (0x1<<2);
	//PF7 99中断
	GICD->ISENABLER[3] |= (0x1<<3);
	//GICD_ISENABLERx设置中断优先级
	//PF7
	GICD->IPRIORITYR[24] &= (~(0x1F<<11));
	//PF8
	GICD->IPRIORITYR[24] &= (~(0x1F<<19));
	//PF9
	GICD->IPRIORITYR[24] &= (~(0x1F<<27));
	//设置当前中断被转发到哪一个CPU处理GICD_ITARGETSRx
	//PF7 97中断
	GICD->ITARGETSR[24] &= (~(0x3<<8));
	GICD->ITARGETSR[24] |= (0x1<<8);
	//PF8 98中断
	GICD->ITARGETSR[24] &= (~(0x3<<16));
	GICD->ITARGETSR[24] |= (0x1<<16);
	//PF9 99中断
	GICD->ITARGETSR[24] &= (~(0x3<<24));
	GICD->ITARGETSR[24] |= (0x1<<24);
	//使能CPU可以处理组0转发的中断GICC_CTLR
	GICD->CTRL |= 0x1;
	//设置中断优先级掩码GICC_CTLR
	GICC->PMR |= (0x1F<<3);
}
//延时函数
/*void delay(int ms)
{
	int i,j;
	for(i=0;i<ms;i++)
	{
		for(j=0;j<2000;j++);
	}
}*/
//灯 GPIO初始化
void all_led_init()
{
	//RCC使能
	RCC->MP_AHB4ENSETR |= (0x3<<4);
	//设置PE10
	//PE10
	GPIOE->MODER &=(~(0x3f<<16));
	GPIOE->MODER |=(0x15<<16);
	//PB6
	GPIOB->MODER &=(~(0x3<<12));
	GPIOB->MODER |=(0x1<<12);
	//设置推挽输出
	//PE10
	GPIOE->OTYPER &=(~(0x1<<10));
	//PB6
	GPIOB->OTYPER &=(~(0x1<<6));
	//设置2个管脚低速输出
	//PE10
	GPIOE->OSPEEDR &=(~(0x3<<20));
	//PB6
	GPIOB->OSPEEDR &=(~(0x3<<12));
	//PE10
	GPIOE->PUPDR &=(~(0x3<<20));
	//PB6
	GPIOB->PUPDR &=(~(0x3<<12));
}

src/do_irq.c

#include "key_it.h"
#include "myuart.h"
#include "led.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;

int num1=0,num2=0,num3=0;
void do_irq(void) 
{
	int irqno;//保存中断号
	irqno = GICC->IAR&0X3FF;
	switch(irqno)
	{
		case 99://key1
			//按键1中断处理
			printf("KEY INT1\n");
			//风扇转
			if(num3==0)
			{
				GPIOE->ODR |=(0x1<<9);
				num3++;
			}
			//风扇停
			else if(num3>0)
			{
				GPIOE->ODR &=(~(0x1<<9));
				num3=0;
			}
			//清除挂起中断标志位GICD_ICPENDRx
			GICD->ICPENDR[3] |= (0x1<<3);
			//清除中断触发标志位EXTI_FRR1
			EXTI->FPR1 |= (0x1<<9);
			break;
		case 97://key2
			//按键2中断处理
			printf("KEY INT2\n");
			//蜂鸣器响
			if(num2==0)
			{
				GPIOB->ODR |=(0x1<<6);
				num2++;
			}
			//蜂鸣器停
			else if(num2>0)
			{
				GPIOB->ODR &=(~(0x1<<6));
				num2=0;
			}
			//清除挂起中断标志位GICD_ICPENDRx
			GICD->ICPENDR[3] |= (0x1<<1);
			//清除中断触发标志位EXTI_FRR1
			EXTI->FPR1 |= (0x1<<7);
			break;
		case 98://key3
			//按键3中断处理
			printf("KEY INT3\n");
			//LED1亮
			if(num1==0)
			{
				GPIOE->ODR |=(0x1<<10);
				num1++;
			}
			else if(num1>0)
			{
				GPIOE->ODR &=(~(0x1<<10));
				num1=0;
			}
			//清除挂起中断标志位GICD_ICPENDRx
			GICD->ICPENDR[3] |= (0x1<<2);
			//清除中断触发标志位EXTI_FRR1
			EXTI->FPR1 |= (0x1<<8);
			break;
	}
	//清除处理完的中断号GICC_EOIR
	GICC->EOIR=irqno;
}

include/led.h

#ifndef __LED_H__
#define __LED_H__
//创建寄存器组织结构体
/*
typedef struct
{
	unsigned int moder;
	unsigned int otyper;
	unsigned int ospeedr;
	unsigned int pupdr;
	unsigned int idr;
	unsigned int odr;
}gpio_t;
#define GPIOE (*(gpio_t)0x50006000)
#define GPIOE (*(gpio_t)0x50007000)
#define RCC (*(unsigned int *)0x50000A28)
*/
void deley(int ms);
void all_led_init();
#endif

include/key_it.h

#ifndef __KEY_IT_H__
#define __KEY_IT_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
void key_it_config();
#endif

main.c

#include "myuart.h"
#include "key_it.h"
#include "led.h"
int main()
{
	//char c;
	//char *s;
	uart4_init();//串口初始化
	//中断初始化
	key_it_config();
	//初始化
	all_led_init();
	while(1)
	{
		//保证主程序不结束
		//串口数据收发
		//接受一个字符
		//c=getchar();
		//发送字符
		//putchar(c+1);
		//接受一个字符串
		//s=my_gets();
		//发送一个字符串
		//my_puts(s);
	}
	return 0;
}

结果：