main.c:

#include "uart.h"#include "key_it.h"int main(){char c;char *s;uart4_init();    //串口初始化//中断初始化key_it_config();key3_it_config();//完成GPIO相关初始化all_led_init();//风扇初始化fs_init();//蜂鸣器初始化fmq_init();while(1){//保证主程序不结束}return 0;}

key_it.c:

#include"key_it.h"void key3_it_config()
{RCC->MP_AHB4ENSETR |= (0x1<<5);GPIOF->MODER &= (~(0x3<<16));EXTI->EXTICR3 &= (~(0xFF)<<0);EXTI->EXTICR3 |= (0x5<<0);EXTI->FTSR1 |= (0x1<<8);	EXTI->C1IMR1 |= (0x1<<8);	GICD->ISENABLER[3] |= (0x1<<2);GICD->IPRIORITYR[24] &= (~(0x1F<<19));	GICD->ITARGETSR[24] &= (~(0x3<<16));GICD->ITARGETSR[24] |= (0x1<<16);
}void key_it_config()
{//RCC使能GPIOF时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//设置PF9、PF7、PF8 GPIO输入//PF9GPIOF->MODER &= (~(0x3<<18));//PF8GPIOF->MODER &= (~(0x3<<16));//PF7GPIOF->MODER &= (~(0x3<<14));	//设置PF9、PF7、PF8产生EXIT事件 EXTI_EXTICRx//PF7EXTI->EXTICR2 &= (~(0xFF)<<24);EXTI->EXTICR2 |= (0x5<<24);//PF8EXTI->EXTICR3 &= (~(0xFF)<<0);EXTI->EXTICR3 |= (0x5<<0);//PF7EXTI->EXTICR3 &= (~(0xFF)<<8);EXTI->EXTICR3 |= (0x5<<8);//设置事件触发方式为下降沿触发EXTI_FTSR1//PF7EXTI->FTSR1 |= (0x1<<7);	//PF8EXTI->FTSR1 |= (0x1<<8);	//PF9EXTI->FTSR1 |= (0x1<<9);//设置EXTI事件触发不屏蔽EXTI_IMR1//PF7EXTI->C1IMR1 |= (0x1<<7);	//PF8EXTI->C1IMR1 |= (0x1<<8);	//PF9EXTI->C1IMR1 |= (0x1<<9);//使能中断能转发到特定的CPU接口层GICD_ISENABLERx//PF7 97号中断GICD->ISENABLER[3] |= (0x1<<1);//PF8 98号中断GICD->ISENABLER[3] |= (0x1<<2);//PF9 99号中断GICD->ISENABLER[3] |= (0x1<<3);	//GICD_ISENABLERx设置中断优先级//PF7GICD->IPRIORITYR[24] &= (~(0x1F<<11));//PF8GICD->IPRIORITYR[24] &= (~(0x1F<<19));	//PF7GICD->IPRIORITYR[24] &= (~(0x1F<<27));//设置当前中断被转发到那一个cpu处理GICD_ITARGETSRx//PF7 97中断GICD->ITARGETSR[24] &= (~(0x3<<8));GICD->ITARGETSR[24] |= (0x1<<8);//PF8 98中断GICD->ITARGETSR[24] &= (~(0x3<<16));GICD->ITARGETSR[24] |= (0x1<<16);//PF9 99中断GICD->ITARGETSR[24] &= (~(0x3<<24));GICD->ITARGETSR[24] |= (0x1<<24);//使能组0转发中断GICD_CTLRGICD->CTRL |= 0x1;//设置中断优先级掩码GICC_CTLRGICC->PMR |= (0x1F<<3);//使能CPU可以处理组0转发的中断GICC_CTLRGICC->CTRL |= 0x1;}//延时函数
void deley(int ms)
{int i,j;for(i=0;i<ms;i++){for(j=0;j<2000;j++);}
}//GPIO初始化
void all_led_init()
{//RCC使能RCC->MP_AHB4ENSETR |= (0x3<<4);//设置PE10、PF10、PE8为输出GPIOE->MODER &= (~(0x3<<20));GPIOE->MODER |= (0x1<<20);GPIOF->MODER &= (~(0x3<<20));GPIOF->MODER |= (0x1<<20);GPIOE->MODER &= (~(0x3<<16));GPIOE->MODER |= (0x1<<16);//设置推挽输出GPIOE->OTYPER &= (~(0x1<<10));GPIOF->OTYPER &= (~(0x1<<10));GPIOE->OTYPER &= (~(0x1<<8));//设置三个管脚低速输出GPIOE->OSPEEDR &= (~(0x3<<20));GPIOF->OSPEEDR &= (~(0x3<<20));GPIOE->OSPEEDR &= (~(0x3<<16));//设置三个管脚输出时无上拉电阻和下拉电阻GPIOE->PUPDR &=(~(0x3<<20));GPIOF->PUPDR &=(~(0x3<<20));GPIOE->PUPDR &=(~(0x3<<16));
}//风扇初始化
void fs_init()
{//RCC使能RCC->MP_AHB4ENSETR |= (0x1<<4);//设置PE9为输出GPIOE->MODER &= (~(0x3<<18));GPIOE->MODER |= (0x1<<18);//设置推挽输出GPIOE->OTYPER &= (~(0x1<<9));//设置管脚低速输出GPIOE->OSPEEDR &= (~(0x3<<18));//设置管脚输出时无上拉电阻和下拉电阻GPIOE->PUPDR &=(~(0x3<<18));
}//蜂鸣器初始化
void fmq_init()
{//RCC使能RCC->MP_AHB4ENSETR |= (0x1<<1);//设置PB6为输出GPIOB->MODER &= (~(0x3<<12));GPIOB->MODER |= (0x1<<12);//设置推挽输出GPIOB->OTYPER &= (~(0x1<<6));//设置管脚低速输出GPIOB->OSPEEDR &= (~(0x3<<12));//设置管脚输出时无上拉电阻和下拉电阻GPIOB->PUPDR &=(~(0x3<<12));
}

do_irq.c:

#include"key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i=0;void do_irq(void) 
{int irqno;   //保存中断号irqno=GICC->IAR & 0x3FF;switch(irqno){case 99://key1{//按键1中断处理printf("KEY1 INT\n");if((GPIOE->ODR==(GPIOE->ODR&(~(0x1<<10))))&&(GPIOF->ODR==(GPIOF->ODR&(~(0x1<<10))))&&(GPIOE->ODR==(GPIOE->ODR&(~(0x1<<8))))){GPIOE->ODR |= (0x1<<10);GPIOF->ODR |= (0x1<<10);GPIOE->ODR |= (0x1<<8);}else if((GPIOE->ODR==(GPIOE->ODR|(0x1<<10)))&&(GPIOF->ODR==(GPIOF->ODR|(0x1<<10)))&&(GPIOE->ODR==(GPIOE->ODR|(0x1<<8)))){GPIOE->ODR &= (~(0x1<<10));				GPIOF->ODR &= (~(0x1<<10));				GPIOE->ODR &= (~(0x1<<8));				}//清除挂起中断标志位GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1<<3);//清除中断触发标志位EXTI_FPR1EXTI->FPR1 |= (0x1<<9);break;}case 97://key2{//按键2中断处理printf("KEY2 INT\n");if(GPIOB->ODR==(GPIOB->ODR&(~(0x1<<6)))){GPIOB->ODR |= (0x1<<6);}else if(GPIOB->ODR==(GPIOB->ODR|(0x1<<6))){GPIOB->ODR &= (~(0x1<<6));}//清除挂起中断标志位GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1<<1);//清除中断触发标志位EXTI_FPR1EXTI->FPR1 |= (0x1<<7);break;}case 98://key3{//按键3中断处理printf("KEY3 INT\n");if(GPIOE->ODR==(GPIOE->ODR&(~(0x1<<9)))){GPIOE->ODR |= (0x1<<9);}else if(GPIOE->ODR==(GPIOE->ODR|(0x1<<9))){GPIOE->ODR &= (~(0x1<<9));}//清除挂起中断标志位GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1<<2);//清除中断触发标志位EXTI_FPR1EXTI->FPR1 |= (0x1<<8);break;}}//清除处理完的中断号GICC_EOIRGICC->EOIR=irqno;}

key_it.h:

#ifndef __KEY_IT_H__
#define __KEY_IT_H__
#include"stm32mp1xx_rcc.h"
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_exti.h"
#include"stm32mp1xx_gic.h"void key_it_config();
void key3_it_config();
void deley(int ms);
void all_led_init();
void fs_init();
void fmq_init();#endif

现象：