按键1实现小灯亮灭，按键2实现蜂鸣器，安静3实现风扇

src/key_it.c

#include"key_it.h"void key3_it_config()
{//RCC使能GPIOF时钟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 PF8GPIO输入//PF9GPIOF->MODER &= (~(0x3<<18));//PF8// GPIOF->MODER &= (~(0x3<<16));//pf7GPIOF->MODER &= (~(0x3<<14));//设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx//pf7EXTI->EXTICR2 &=(~(0xFF<<24));EXTI->EXTICR2 |= (0x5<<24);//pf8// EXTI->EXTICR3 &=(~(0xFF<<0));// EXTI->EXTICR3 |= (0x5<<0);//pf9EXTI->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);//pf8// EXTI->FTSR1 |= (0x1<<8);//pf9EXTI->FTSR1 |= (0x1<<9);//设置EXTI事件触发不屏蔽EXTI_IMR1//PF7EXTI->C1IMR1 |= (0x1<<7);//PF8// EXTI->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); //PF78 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)); //PF8// GICD->IPRIORITYR[24] &= (~(0X1F<<19)); //PF9GICD->IPRIORITYR[24] &= (~(0X1F<<27)); //设置当前中断被转发到哪一个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_PMRGICC->PMR |= (0x1F<<3);//使能CPU可以处理组0转发的中断GICC_CTLRGICC->CTRL |= 0X1;}
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));}
void all_fmq_init()
{RCC->MP_AHB4ENSETR |=(0x1<<1);GPIOB->MODER &=(~(0x3<<12));GPIOB->MODER |=(0x1<<12);GPIOB->OTYPER &=(~(0x1<<6));GPIOB->OSPEEDR &=(~(0x3<<12));GPIOB->PUPDR &=(~(0x3<<12));
}
void all_fun_init()
{GPIOE->MODER &=(~(0x3<<18));GPIOE->MODER |=(0x1<<18);GPIOE->OTYPER &=(~(0x1<<9));GPIOE->OSPEEDR &=(~(0x3<<18));GPIOE->PUPDR &=(~(0x3<<18));}

src/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if(GPIOE->ODR&(1<<10)){GPIOE->ODR&=(~(1<<10));}else{GPIOE->ODR |=(1<<10);}printf("KEY1 INT\n");// 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: // KEY2if(GPIOB->ODR & (1<<6)){GPIOB->ODR &= (~(1<<6));}else{GPIOB->ODR |= (1<<6);}// 按键2中断处理printf("KEY2 INT\n");// 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if(GPIOE->ODR & (1<<9)){GPIOE->ODR &= (~(1<<9));}else{GPIOE->ODR |= (1<<9);}printf("KEY3 INT\n");// 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;
}

include/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 all_led_init();
void all_fmg_init();
void all_fun_init();
#endif

main.c

#include"uart.h"
#include"key_it.h"
int main()
{char c;char *s;uart4_init();//串口初始化key_it_config();key3_it_config();all_led_init();all_fmq_init();all_fun_init();while(1){//串口数据收发//接受一个字符//c=getchar();//发送一个字符//putchar(c+1);//	s=getchars();//	putchars(s);//LED1亮}return 0;
}