程序代码：

mykey.h:

#ifndef __MYKEY_H__
#define __MYKEY_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
extern void printf(const char *fmt, ...);
void key1_int_config();
void key2_int_config();
void key3_int_config();
#endif

main.c:

#include "mykey.h"void delay_ms(int ms){int i,j;for(i=0;i<ms;i++){for(j=0;j<2000;j++){}}
}
int main()
{//按键中断初始化key1_int_config();key2_int_config();key3_int_config();while(1){printf("main func\n");delay_ms(1000);}
}

mykey.c:

#include "mykey.h"
void key1_int_config()
{//使能GPIOF外设时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//设置PF9为输入GPIOF->MODER &= (~(0X3<<18));//设置PF9产生EXTI9事件EXTI->EXTICR3 &= (~(0Xff<<8));EXTI->EXTICR3 |= (0X05<<8);//设置下降沿检测EXTI9事件EXTI->FTSR1 |= (0x1<<9);//取消EXTI9事件的屏蔽EXTI->C1IMR1 |= (0x1<<9);//全局使能99号中断GICD->ISENABLER[3] |= (0x1<<3);//设置99号中断优先级GICD->IPRIORITYR[24] &= (~(0X1f<<27));//最高优先级//设置99号中断的目标处理器GICD->ITARGETSR[24] |= (0x1<<24);//允许组0中断被转发到GICC层GICD->CTRL |= 0X1;//设置中断优先级掩码GICC->PMR |=(0x1f<<3);//允许组0中断被转发给处理器GICC->CTRL |= 0X1;
}
void key2_int_config()
{//使能GPIOF外设时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//设置PF7为输入GPIOF->MODER &= (~(0X3<<14));//设置PF7产生EXTI7事件EXTI->EXTICR2 &= (~(0Xff<<24));EXTI->EXTICR2 |= (0X05<<24);//设置下降沿检测EXTI7事件EXTI->FTSR1 |= (0x1<<7);//取消EXTI7事件的屏蔽EXTI->C1IMR1 |= (0x1<<7);//全局使能97号中断GICD->ISENABLER[3] |= (0x1<<1);//设置97号中断优先级GICD->IPRIORITYR[24] &= (~(0X1f<<11));//设置97号中断的目标处理器GICD->ITARGETSR[24] |= (0x1<<8);//允许组0中断被转发到GICC层GICD->CTRL |= 0X1;//设置中断优先级掩码GICC->PMR |=(0x1f<<3);//最低优先级//允许组0中断被转发给处理器GICC->CTRL |= 0X1;
}
void key3_int_config()
{//使能GPIOF外设时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//设置PF8为输入GPIOF->MODER &= (~(0X3<<16));//设置PF8产生EXTI8事件EXTI->EXTICR3 &= (~0Xff);EXTI->EXTICR3 |= 0X05;//设置下降沿检测EXTI8事件EXTI->FTSR1 |= (0x1<<8);//取消EXTI8事件的屏蔽EXTI->C1IMR1 |= (0x1<<8);//全局使能98号中断GICD->ISENABLER[3] |= (0x1<<2);//设置98号中断优先级GICD->IPRIORITYR[24] &= (~(0X1f<<19));//设置98号中断的目标处理器GICD->ITARGETSR[24] |= (0x1<<16);//允许组0中断被转发到GICC层GICD->CTRL |= 0X1;//设置中断优先级掩码GICC->PMR |=(0x1f<<3);//允许组0中断被转发给处理器GICC->CTRL |= 0X1;
}

do_irq.c:

#include "mykey.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{//获取中断号unsigned int irqno=(GICC->IAR&0X3ff);switch (irqno){case  99://中断处理逻辑printf("KEY1_INTC\n");//清除GICD中断标志GICD->ICPENDR[3] |= (0x1<<3);//清除EXTI中断触发标志EXTI->FPR1 |= (0X1<<9);break;case  97://中断处理逻辑printf("KEY2_INTC\n");//清除GICD中断标志GICD->ICPENDR[3] |= (0x1<<3);//清除EXTI中断触发标志EXTI->FPR1 |= (0X1<<9);break;case  98://中断处理逻辑printf("KEY3_INTC\n");//清除GICD中断标志GICD->ICPENDR[3] |= (0x1<<3);//清除EXTI中断触发标志EXTI->FPR1 |= (0X1<<9);break;}//清除IAR寄存器中保存的中断号GICC->EOIR=irqno;
}

运行结果：