ARM 按键控制 LED灯，蜂鸣器，风扇

main.c:

#include "uart.h"
#include "key_it.h"
int main()
{
	all_led_init();
    uart4_init();//串口初始化
    //中断初始化
    key_it_config();
    key3_it_config();
	buzzer_init();
	fan_init();
    while(1)
    {
        //保证主程序不结束
    }
    return 0;
}
 

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
    //PF9
    GPIOF->MODER &= (~(0x3<<18));
    //PF8
    // GPIOF->MODER &= (~(0x3<<16));
    //pf7
    GPIOF->MODER &= (~(0x3<<14));
    //设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx
    //pf7
    EXTI->EXTICR2 &=(~(0xFF<<24));
    EXTI->EXTICR2 |= (0x5<<24);
    //pf8
    // EXTI->EXTICR3 &=(~(0xFF<<0));
    // EXTI->EXTICR3 |= (0x5<<0);
    //pf9
    EXTI->EXTICR3 &=(~(0xFF<<8));
    EXTI->EXTICR3 |= (0x5<<8);
    //设置事件触发方式为下降沿触发EXTI_FTSR1
    //pf7
    EXTI->FTSR1 |= (0x1<<7);
    //pf8
    // EXTI->FTSR1 |= (0x1<<8);
    //pf9
    EXTI->FTSR1 |= (0x1<<9);
    //设置EXTI事件触发不屏蔽EXTI_IMR1
    //PF7
    EXTI->C1IMR1 |= (0x1<<7);
    //PF8
    // EXTI->C1IMR1 |= (0x1<<8);
    //PF9
    EXTI->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
    //PF7
    GICD->IPRIORITYR[24] &= (~(0X1F<<11)); 
    //PF8
    // GICD->IPRIORITYR[24] &= (~(0X1F<<19)); 
    //PF9
    GICD->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_CTLR
    GICD->CTRL |= 0X1;
    //设置中断优先级掩码GICC_PMR
    GICC->PMR |= (0x1F<<3);
 
    //使能CPU可以处理组0转发的中断GICC_CTLR
    GICC->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);
        //设置推挽输出
    GPIOE->OTYPER &= (~(0X1<<10));
     //设置三个管脚低速输出
    GPIOE->OSPEEDR &= (~(0X3<<20));
     //设置三个管脚输出时无上拉电阻和下拉电阻
    GPIOE->PUPDR &= (~(0X3<<20));
}
void buzzer_init()
{
    //RCC使能
    RCC->MP_AHB4ENSETR |= (0x1<<1);
    //设置PE10 PF10 PE8为输出
    GPIOB->MODER &= (~(0X3<<12));
    GPIOB->MODER |= (0X1<<12);
        //设置推挽输出
    GPIOB->OTYPER &= (~(0X1<<6));
     //设置三个管脚低速输出
    GPIOB->OSPEEDR &= (~(0X3<<12));
     //设置三个管脚输出时无上拉电阻和下拉电阻
    GPIOB->PUPDR &= (~(0X3<<12));
}
void fan_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));
    //设置三个管脚低速输出
    GPIOE->OSPEEDR &= (~(0X3<<18));
    //设置三个管脚输出时无上拉电阻和下拉电阻    
    GPIOE->PUPDR &= (~(0X3<<18));
}
 

 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 key3_it_config();
void all_led_init();
void buzzer_init();
void fan_init();
#endif

 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");
			GPIOE->ODR ^=(0X1<<10);
    //清除挂起中断标志位GICD_ICPENDRx
        GICD->ICPENDR[3] |= (0x1<<3);
    //清除中断触发标志位EXTI_FPR1
        EXTI->FPR1 |= (0x1<<9);
            break;
        case 97://key2
            //按键2中断处理
            printf("KEY2 INT\n");
			GPIOB->ODR ^=(0x1<<6);
    //清除挂起中断标志位GICD_ICPENDRx
    GICD->ICPENDR[3] |= (0x1<<1);
    //清除中断触发标志位EXTI_FPR1
    EXTI->FPR1 |= (0x1<<7);
            break;
        case 98://key3
            //按键3中断处理
            printf("KEY3 INT\n");
			GPIOE->ODR ^=(0x1<<9);
    //清除挂起中断标志位GICD_ICPENDRx
    GICD->ICPENDR[3] |= (0x1<<2);
    //清除中断触发标志位EXTI_FPR1
    EXTI->FPR1 |= (0x1<<8);
            break;
    }
    //清除处理完的中断号GICC_EOIR
    GICC->EOIR =irqno;
}