三个按键中断，控制对应灯亮灭

main.c

#include "key_it.h"

void delay(int ms)

{

	int i,j;

	for(i=0;i<ms;i++)

	{

		for(j=0;j<2000;j++);

	}

}



int main()

{

	all_led_init();

	key1_it_config();

	key2_it_config();

	key3_it_config();

	while(1)

	{

		printf("do main...\n");

		delay(1000);

	}

}

do_irq.c

#include "key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
    int irqno = (GICC->IAR & 0x3ff);
    switch(irqno)
    {
        case 99:
        printf("KEY1_INT\n");
        led1_on();
        led2_off();
        led3_off();
        //求出GICD的中断排队标志
        GICD->ICPENDR[3] |= (0x1<<3);
        //清除exti的事件触发标志
        EXTI->FPR1 |= (0x1<<9);
        break;

        case 97:
        printf("KEY2_INT\n");
        led1_off();
        led2_on();
        led3_off();
        GICD->ICPENDR[1] |= (0x1);
        EXTI->FPR1 |= (0x1<<7);
        break;

        case 98:
        printf("KEY3_INT\n");
        led1_off();
        led2_off();
        led3_on();
        GICD->ICPENDR[2] |= (0x1<<2);
        EXTI->FPR1 |= (0x1<<8);
        break;
    }
    GICC->EOIR = irqno;
}

key_it.c

#include "key_it.h"
void key1_it_config()
{
    //使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF9管脚为输入
    GPIOF->MODER &= (~(0x3<<18));
    //设置PF9作为EXTI9事件的输入
    EXTI->EXTICR3 &= (~(0x1f<<8));
    EXTI->EXTICR3 |= (0x05<<8);
    //设置下降沿使能检测EXTI9事件
    EXTI->FTSR1 |= (0x1<<9);
    //设置EXTI9事件不屏蔽
    EXTI->C1IMR1 |= (0x1<<9);
    //GICD使能EXTI9（99号）中断
    GICD->ISENABLER[3] |= (0x1<<3);
    //GICD 设置99号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<27));
    //选择CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x1<<24);
    //全局使能组0中断被转发到GICC
    GICD->CTRL |= (0X1);
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //允许组0中断被CPU处理
    GICC->CTRL |= (0x1);
}

void key2_it_config()
{
    //使能GPIOF时钟
    //RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF7管脚为输入
    GPIOF->MODER &=(~(0x3<<14));
    //设置PF7作为EXTI7事件的输入
    EXTI->EXTICR2 &=(~(0x1f<<24));
    EXTI->EXTICR2 |=(0x05<<24);
    //设置下降沿使能检测EXTI9事件
    EXTI->FTSR1 |=(0x1<<7);
    //设置EXTI7事件不屏蔽
    EXTI->C1IMR1 |=(0x1<<7);
    //GICO使能EXTI7(97号)中断
    GICD->ISENABLER[3] |=(0x1<<1);
    //GICO设置97号中断的优先级
    GICD->IPRIORITYR[24] &=(~(0x1f<<11));
    //选择CPU0处理当前中断
    GICD->ITARGETSR[24] |=(0x1<<8);
    //全局使能组0中断被转发到GICC
    GICD->CTRL |= (0x1);
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //允许组0中断被CPU处理
    GICC->CTRL |= (0x1);
}


void key3_it_config()
{
    //使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF8管脚为输入
    GPIOF->MODER &=(~(0x3<<16));
    //设置PF8作为EXTI8事件的输入
    EXTI->EXTICR3 &=(~(0x1f));
    EXTI->EXTICR3 |=(0x05);
    //设置下降沿使能检测EXTI8事件
    EXTI->FTSR1 |=(0x1<<8);
    //设置EXTI9事件不屏蔽
    EXTI->C1IMR1 |=(0x1<<8);
    //GICO使能EXTI8(98号)中断
    GICD->ISENABLER[3] |=(0x1<<2);
    //GICO设置98号中断的优先级
    GICD->IPRIORITYR[24] &=(~(0x1f<<19));
    //选择CPU0处理当前中断
    GICD->ITARGETSR[24] |=(0x1<<16);
    //全局使能组0中断被转发到GICC
    GICD->CTRL |= (0x1);
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //允许组0中断被CPU处理
    GICC->CTRL |= (0x1);
}

key_it.h

#ifndef __KEY_IT_H__
#define __KEY_IT_H__
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_rcc.h"
#include"stm32mp1xx_uart.h"

void key1_it_config();
void key2_it_config();
void key3_it_config();

void all_led_init();
void led1_on();
void led1_off();
void led2_on();
void led2_off();
void led3_on();
void led3_off();
#endif