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main.c

#include"key_inc.h"
 
//封装延时函数
 
void delay(int ms)
 
{
 
    int i,j;
 
    for(i=0;i<ms;i++)
 
    {
 
        for(j=0;j<2000;j++)
 
        {}
 
    }
 
}
 
int main()
 
{
        key1_it_config();
 
        key2_it_config();
 
        key3_it_config();
 
    while(1)
 
    {       
        printf("in main pro\n");
 
        delay(1000);
 
    }
 
    return 0;
 
}

do_irq.c

#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
    //获取要处理的中断的中断号
    unsigned int irqno=GICC->IAR&0x3ff;
    switch (irqno)
    {
    case 99:
        printf("key1_intc\n");
        //清除GICD中断排队标志
        GICD->ICPENDR[3] |= (0X1<<3);
        //清除EXTI中断触发标志
        EXTI->FPR1 |= (0X1<<9);
        break;
    case 97:
        printf("key2_intc\n");
        //清除GICD中断排队标志
        GICD->ICPENDR[3] |= (0X1<<1);
        //清除EXTI中断触发标志
        EXTI->FPR1 |= (0X1<<7);
        break;
    case 98:
        printf("key3_intc\n");
        //清除GICD中断排队标志
        GICD->ICPENDR[3] |= (0X1<<2);
        //清除EXTI中断触发标志
        EXTI->FPR1 |= (0X1<<8);
        break;
    default:
        break;
    }
    //清除IAR寄存器中的中断号
    GICC->EOIR |= irqno;
}

key_inc.c文章来源地址https://www.toymoban.com/news/detail-843451.html

 #include"key_inc.h"
 void key1_it_config()
 {
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF9设置为输入模式
    GPIOF->MODER &= (~(0x3<<18));
    //设置由PF9管脚产生EXTI9事件
    EXTI->EXTICR3 &= (~(0XFF<<8));
    EXTI->EXTICR3|= (0X05<<8);
    //通过下降沿检测EXTI9事件是否产生
    EXTI->FTSR1 |= (0x1<<9);
    //取消EXTI9中断屏蔽
    EXTI->C1IMR1 |= (0x1<<9);
    //设置EXTI9中断全局使能
    GICD->ISENABLER[3] |= (0x1<<3);
    //设置中断优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<27));
    //设置CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x1<<24);
    //设置组0中断可以被转发到GICC层
    GICD->CTRL |=0X1;
    //设置中断优先级掩码
    GICC->PMR |= (0x1f<<3);
    //设置组0中断交给指定处理器处理
    GICC->CTRL |= 0x1;
 }
  void key2_it_config()
 {
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF7设置为输入模式
    GPIOF->MODER &= (~(0x3<<14));
    //设置由PF7管脚产生EXTI7事件
    EXTI->EXTICR2 &= (~(0XFF<<24));
    EXTI->EXTICR2|= (0X05<<24);
    //通过下降沿检测EXTI7事件是否产生
    EXTI->FTSR1 |= (0x1<<7);
    //取消EXTI7中断屏蔽
    EXTI->C1IMR1 |= (0x1<<7);
    //设置EXTI7中断全局使能
    GICD->ISENABLER[3] |= (0x1<<1);
    //设置中断优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<11));
    //设置CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x1<<8);
    //设置组0中断可以被转发到GICC层
    GICD->CTRL |=0X1;
    //设置中断优先级掩码
    GICC->PMR |= (0x1f<<3);
    //设置组0中断交给指定处理器处理
    GICC->CTRL |= 0x1;
 }
 
   void key3_it_config()
 {
     //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF8设置为输入模式
    GPIOF->MODER &= (~(0x3<<16));
    //设置由PF8管脚产生EXTI8事件
    EXTI->EXTICR3 &= (~(0XFF));
    EXTI->EXTICR3|= (0X05);
    //通过下降沿检测EXTI8事件是否产生
    EXTI->FTSR1 |= (0x1<<8);
    //取消EXTI8中断屏蔽
    EXTI->C1IMR1 |= (0x1<<8);
    //设置EXTI8中断全局使能
    GICD->ISENABLER[3] |= (0x1<<2);
    //设置中断优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<19));
    //设置CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x1<<16);
    //设置组0中断可以被转发到GICC层
    GICD->CTRL |=0X1;
    //设置中断优先级掩码
    GICC->PMR |= (0x1f<<3);
    //设置组0中断交给指定处理器处理
    GICC->CTRL |= 0x1;
 }

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