Key的中断

main.c

#include "uart4.h"
#include "led.h"
#include "key_init.h"

void delay(int ms)

{
    int i,j;
    for(i=0;i<ms;i++)
    {
        for(j=0;j<2000;j++)
        {}
    }
}

int main()

{
    //LED初始化
    all_led_init();
    //按键初始化
    key1_it_config();
    key2_it_config();
    key3_it_config();
    while (1)
    {
        printf("hhhhhhhhhhh\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);
    default:
        break;
    }
    //清除IAR寄存器中的中断号
    GICC->EOIR |= irqno;
}

key_init.c

 #include"key_init.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] |= (0x01<<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] |= (0x01 << 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EXTI9事件
    EXTI->EXTICR3 &= (~(0xff));
    EXTI->EXTICR3 |= 0x05;
    //通过下降沿检测EXTI9事件是否产生
    EXTI->FTSR1 |= (0x1<<8);
    //取消EXTI9中断屏蔽
    EXTI->C1IMR1 |= (0x1<<8);
    //设置EXTI9中断全局使能
    GICD->ISENABLER[3] |= (0x1<<2);
    //设置中断优先级
    GICD->IPRIORITYR[24] &= (~(0x1ff<<19));
    //设置CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x01<<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;
 }

现象图