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()
{//按键中断的初始化key1_it_config();key2_it_config();key3_it_config();while(1){printf("in main pro\n");delay(1000);}return 0;
}

key_inc.c:

#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PF8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EXTI9事件EXTI->EXTICR3 &= (~(0XFF << 0));EXTI->EXTICR3 |= (0X05 << 0);// 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;
}

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 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;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;default:break;}// 清除IAR寄存器中的中断号GICC->EOIR |= irqno;
}