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EXTIEXTI->EXTICR3 &= (~(0XFF << 8));EXTI->EXTICR3 |= (0X5 << 8);// 使能EXTIEXTI->EXTICR2 &= (~(0XFF << 24));EXTI->EXTICR2 |= (0X5 << 24);// 使能EXTIEXTI->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cpuGICD->ITARGETSR[24] &= (~(0X3 << 24));GICD->ITARGETSR[24] |= (0X1 << 24);// 中断分配给哪个cpuGICD->ITARGETSR[24] &= (~(0X3 << 8));GICD->ITARGETSR[24] |= (0X1 << 8);// 中断分配给哪个cpuGICD->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