效果图：

源码：

#include "key.h"
void hal_key1_rcc_gpio_init()
{
    // 使能GPIOF组
    RCC->MP_AHB4ENSETR |= (0x1 << 5);
    // 设置引脚位输入模式
    GPIOF->MODER &= (~(0X3 << 18));
    GPIOF->MODER &= (~(0X3 << 16));
    GPIOF->MODER &= (~(0X3 << 14));
}

void hal_key1_exti_init()
{
    // 使能EXTI
    EXTI->EXTICR3 &= (~(0XFF << 8));
    EXTI->EXTICR3 |= (0X5 << 8);

    // 使能EXTI
    EXTI->EXTICR2 &= (~(0XFF << 24));
    EXTI->EXTICR2 |= (0X5 << 24);

    // 使能EXTI
    EXTI->EXTICR3 &= (~(0XFF));
    EXTI->EXTICR3 |= (0X5);

    // 设置为下降沿触发
    EXTI->FTSR1 |= (0X7 << 7);

    // 设置不屏蔽
    EXTI->C1IMR1 |= (0X7 << 7);

    // 清除中断挂起标志位
    EXTI->FPR1 |= (0X1 << 9);
}

void hal_key1_gic_init()
{
    /*--------GCID---------*/
    // gicd组使能
    GICD->CTRL |= (0X1);
    // 对应中断组使能
    GICD->ISENABLER[3] |= (0X1 << 3);
    GICD->ISENABLER[3] |= (0X1 << 2);
    GICD->ISENABLER[3] |= (0X1 << 1);
    // 中断优先级
    GICD->IPRIORITYR[24] &= (~(0X1F << 27));
    GICD->IPRIORITYR[24] |= (0X0A << 27);

    // 中断优先级
    GICD->IPRIORITYR[24] &= (~(0X1F << 11));
    GICD->IPRIORITYR[24] |= (0X0A << 11);

    // 中断优先级
    GICD->IPRIORITYR[24] &= (~(0X1F << 19));
    GICD->IPRIORITYR[24] |= (0X0A << 19);

    // 中断分配给哪个cpu
    GICD->ITARGETSR[24] &= (~(0X3 << 24));
    GICD->ITARGETSR[24] |= (0X1 << 24);

    // 中断分配给哪个cpu
    GICD->ITARGETSR[24] &= (~(0X3 << 8));
    GICD->ITARGETSR[24] |= (0X1 << 8);

    // 中断分配给哪个cpu
    GICD->ITARGETSR[24] &= (~(0X3 << 16));
    GICD->ITARGETSR[24] |= (0X1 << 16);

    // 清除挂起位标志
    // GICD->ICPENDR[2] |= (0X1 << 3);
    // GICD->ICPENDR[1] |= (0X1 << 1);
    // GICD->ICPENDR[2] |= (0X1 << 2);
    /*--------GICC---------*/
    GICC->CTRL |= (0X1);
    GICC->PMR &= (~(0X1F << 3));
    GICC->PMR |= (0X0F << 3);
}

#include "key.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) // 中断处理函数
{
    // printf("have someone asshole interrupt!\n");
    unsigned int irq_number = GICC->IAR & 0x3FF;

    // 根据中断号调用对应的中断处理函数
    switch (irq_number)
    {
    case 99:
        printf("key1 down!!!key1 ID = %d\n", irq_number);
        EXTI->FPR1 |= (0X1 << 9);
        GICD->ICPENDR[3] |= (0X1 << 3);
        GICC->EOIR = irq_number;
        break;
    case 98:
        printf("key3 down!!!key3 ID = %d\n", irq_number);
        EXTI->FPR1 |= (0X1 << 8);
        GICD->ICPENDR[3] |= (0X1 << 2);
        GICC->EOIR = irq_number;
        break;
    case 97:
        printf("key2 down!!!key2 ID = %d\n", irq_number);
        EXTI->FPR1 |= (0X1 << 7);
        GICD->ICPENDR[3] |= (0X1 << 1);
        GICC->EOIR = irq_number;
        break;
    default:
        // 处理其他中断或错误情况
        break;
    }

    // 清除中断号
    // EXTI->FPR1 |= (0X1 << 9);
    //GICD->ICPENDR[3] |= (0X1 << 3);
    //GICC->EOIR = irq_number;
}

#include "key.h"

int main()
{
	hal_key1_exti_init();
	hal_key1_gic_init();
	hal_key1_rcc_gpio_init();
	while (1)
	{
	}
	return 0;
}

#ifndef __KEY_H__
#define __KEY_H__
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"

void hal_key1_rcc_gpio_init();

void hal_key1_exti_init();

void hal_key1_gic_init();

#endif