按键中断实现LED、蜂鸣器、风扇工作

1.key_in.c

#include "key_in.h"
 
void gpio_init()
{
	//RCC使能
	//GPIOE
	RCC->MP_AHB4ENSETR |= (0x1<<4);
	//GPIOB
	RCC->MP_AHB4ENSETR |= (0x1<<1);
 
	//PE10、PB6、PE9输出模式
	GPIOE->MODER &= ~(0x3<<20);
	GPIOE->MODER |= (0x1<<20);
	GPIOB->MODER &= ~(0x3<<12);
	GPIOB->MODER |= (0x1<<12);
	GPIOE->MODER &= ~(0x3<<18);
	GPIOE->MODER |= (0x1<<18);
	//推挽模式
	GPIOE->OTYPER &= ~(0x1<<10);
	GPIOB->OTYPER &= ~(0x1<<6);
	GPIOE->OTYPER &= ~(0x1<<9);
	//速度设置为低速
	GPIOE->OSPEEDR &= ~(0x3<<20);
	GPIOB->OSPEEDR &= ~(0x3<<12);
	GPIOE->OSPEEDR &= ~(0x3<<18);
	//设置为无上拉下拉电阻
	GPIOE->PUPDR &= ~(0x3<<20);
	GPIOB->PUPDR &= ~(0x3<<12);
	GPIOE->PUPDR &= ~(0x3<<18);
	
}
void key_in_config()
{
	//RCC使能GPIOF时钟
	RCC->MP_AHB4ENSETR |= (0x1<<5);
	//设置PF9 PF7 PF8管脚为输入模式
	GPIOF->MODER &= ~(0x3f<<14);
 
	//设置PF9 PF7 PF8发生EXTI事件 
	EXTI->EXTICR3 &= ~(0xff<<8);
	EXTI->EXTICR3 |= (0x05<<8);
	EXTI->EXTICR2 &= ~(0xff<<24);
	EXTI->EXTICR2 |= (0x05<<24);
	EXTI->EXTICR3 &= ~(0xff);
	EXTI->EXTICR3 |= (0x05);
	//设置EXTI中断触发模式为下降沿模式
	EXTI->FTSR1 |= (0x7<<7);
	//设置EXTI事件触发为不屏蔽
	EXTI->C1IMR1 |= (0x7<<7);
 
	//使能组0
	GICD->CTRL |= 0x1;
	//中断使能，使其可以传到CPU
	GICD->ISENABLER[3] |= (0x1<<3);
	GICD->ISENABLER[3] |= (0x1<<1);
	GICD->ISENABLER[3] |= (0x1<<2);
	//设置中断优先级
	GICD->IPRIORITYR[24] &= ~(0x1f<<27);
	GICD->IPRIORITYR[24] &= ~(0x1f<<11);
	GICD->IPRIORITYR[24] &= ~(0x1f<<19);
	//选择CPU处理中断
	GICD->ITARGETSR[24] &= ~(0x3<<24);
	GICD->ITARGETSR[24] |= (0x1<<24);
	GICD->ITARGETSR[24] &= ~(0x3<<8);
	GICD->ITARGETSR[24] |= (0x1<<8);
	GICD->ITARGETSR[24] &= ~(0x3<<16);
	GICD->ITARGETSR[24] |= (0x1<<16);
	//使能CPU处理转发的中断
	GICC->CTRL |= 0x1;
	//设置中断掩码
	GICC->PMR &= ~(0x1f<<3);
	GICC->PMR |= (0x5<<3);
 
 
}

2. do_irq.c:

#include "key_in.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
 
void do_irq(void) 
{
	int irqno;
	static int i1=0,i2=0,i3=0;
	irqno = GICC->IAR & 0x3ff;
	switch(irqno)
	{
		case 99:
			printf("KEY1 %d\n",irqno);
			i1++;
			//key1中断处理,LED1
			if(i1%2==1)
				GPIOE->ODR |= (0x1<<10);
			else
				GPIOE->ODR &= ~(0x1<<10);
			//清除挂起中断标识位
			GICD->ICPENDR[3] |= (0x1<<3);
			//清除事情挂起标识位
			EXTI->FPR1 |= (0x1<<9);
			break;
		case 97:
			printf("KEY2 %d\n",irqno);
			i2++;
			//key2中断处理,蜂鸣器
			if(i2%2==1)
				GPIOB->ODR |= (0x1<<6);
			else
				GPIOB->ODR &= ~(0x1<<6);
			//清除挂起中断标识位
			GICD->ICPENDR[3] |= (0x1<<1);
			//清除事情挂起标识位
			EXTI->FPR1 |= (0x1<<7);
			break;
		case 98:
			printf("KEY3 %d\n",irqno);
			i3++;
			//key3中断处理,风扇
			if(i3%2==1)
				GPIOE->ODR |= (0x1<<9);
			else
				GPIOE->ODR &= ~(0x1<<9);
			//清除挂起中断标识位
			GICD->ICPENDR[3] |= (0x1<<2);
			//清除事情挂起标识位
			EXTI->FPR1 |= (0x1<<8);
			break;
	}
	//清除处理完的中断IAR到EOIR
	GICC->EOIR=irqno;
}

3. key_in.h:

#ifndef __KEY_IN_H__
#define __KEY_IN_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
 
 
void gpio_init();
void key_in_config();
#endif

4. main.c

#include "key_in.h"
 
int main()
{
	gpio_init();
	key_in_config();
	while(1)
	{
 
	}
	return 0;
}

5. 实验现象：