ARM_day9 按钮控制LED灯、蜂鸣器、风扇实验

key.h

cpp 复制代码

#ifndef __KEY__H__
#define __KEY__H__
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_rcc.h"
#include"stm32mp1xx_gic.h"
#include"stm32mp1xx_exti.h"


void key_config();
void all_led_init();
void fan_init();
void sp_init();
#endif

key.c

cpp 复制代码

#include"key.h"

void key_config()
{
	//RCC使能GPIOF时钟
	RCC->MP_AHB4ENSETR |= (0X1<<5);
	//设置PF9 PF7 PF8GPIO输入
	GPIOF->MODER&=(~(0x3<<18));   //设置key1->PF9;
	GPIOF->MODER&=(~(0x3<<14));   //设置key1->PF7;
	GPIOF->MODER&=(~(0x3<<16));   //设置key1->PF8;
	//设置PF9 PF7 PF8产生EXTI事件 EXTI EXTICRX
	//key1->PF9初始化
	EXTI->EXTICR3&=(~(0xff<<8));
	EXTI->EXTICR3|=(0x05)<<8;

	//key2->PF7初始化
	EXTI->EXTICR2&=(~(0xFF<<24));
	EXTI->EXTICR2|=(0x5)<<24;

	//key3->PF8初始化
	EXTI->EXTICR3&=(~(0xff)<<0);
	EXTI->EXTICR3|=(0x5)<<0;
	//设置事件触发方式为下降沿触发EXTI_FTSR1
	EXTI->FTSR1|=(0x1<<9);
	//key2->pf7初始化
	EXTI->FTSR1|=(0x1<<7);
	//key3->pf8初始化
	EXTI->FTSR1|=(0x1<<8);
	//设置EXTI事件触发不屏蔽EXTI_IMR1
	//key1->pf9初始化
	EXTI->C1IMR1|=(0x1<<9);
	//key2->pf7初始化
	EXTI->C1IMR1|=(0x1<<7);
	//key3->pf8初始化
	EXTI->C1IMR1|=(0x1<<8);

	//使能中断能转发到特定的CPU接口层GICD ISENABLERX
	GICD->ISENABLER[3]|=(0x1<<3);   //key1
	GICD->ISENABLER[3]|=(0x1<<1);   //key2
	GICD->ISENABLER[3]|=(0x1<<2);   //key3
	//GICD ISENABLERx设置中断优先级
	GICD->IPRIORITYR[24]&=(~(0x1f<<27));   //key1
	GICD->IPRIORITYR[24]&=(~(0x1f<<11));   //key2
	GICD->IPRIORITYR[24]&=(~(0x1f<<19));   //key3
	//设置当前中断被转发到哪一个CPu处理GICD_ITARGETSRX
	GICD->ITARGETSR[24]&=(~(0x3<<24));  //分配给cpu0
	GICD->ITARGETSR[24]|=(0x1<<24);   	//key1
	
	GICD->ITARGETSR[24]&=(~(0x3<<8));  //分配给cpu0
	GICD->ITARGETSR[24]|=(0x1<<8);   	//key2
 
	GICD->ITARGETSR[24]&=(~(0x3<<16));  //分配给cpu0
	GICD->ITARGETSR[24]|=(0x1<<16);   	//key3
	//使能cPu可以处理组0转发的中断GICC_CTLR
	GICC->CTRL|=(0x1<<0);
	//设置中断优先级掩码GICC_CTLR
	GICC->PMR|=(0x1f<<3);
	//使能组0转发中断GICD_CTLR
	GICD->CTRL|=(0x1<<0);
}
//GPIO初始化
void all_led_init()
{
	//RCC使能GPIOF时钟
	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));
	
//	GPIOE->ODR &= (~(0X1<<10));
//	GPIOF->ODR &= (~(0X1<<10));
//	GPIOE->ODR &= (~(0X1<<8));

}
//PE9风扇
void fan_init()
{
	//RCC使能GPIOE时钟
	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));

//	GPIOE->ODR &= (~(0X1<<9));
}

//PB6蜂鸣器
void sp_init()
{
    //RCC使能
    RCC->MP_AHB4ENSETR  |= (0x1<<1);
    //设置PE9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));

//	GPIOB->ODR &= (~(0X1<<6));
}

do_irq.c

cpp 复制代码

#include"key.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
	//获取终端号
	int GICC_num=GICC->IAR&0x3ff;
	//判断终端号
	switch (GICC_num)
	{
	case 99:    //key1
		printf("key1\n");
		GPIOE->ODR ^= (0X1<<10);
		GPIOF->ODR ^= (0X1<<10);
		GPIOE->ODR ^= (0X1<<8);
		//清除EXTI
		EXTI->FPR1|=(0x1<<9);   //key1
		//清除终端挂起标志位，清除终端号
		GICD->ICPENDR[3]|=(0x1<<3);                //key1

		break;

	case 97:    //key2
		printf("key2\n");
		GPIOB->ODR ^= (0X1<<6);
		//清除EXTI
		EXTI->FPR1|=(0x1<<7);   //key2
		//清除终端挂起标志位，清除终端号
		GICD->ICPENDR[1]|=(0x1<<1); 			   //key2

		break;
	case 98:
		printf("key3\n");
		GPIOE->ODR ^= (0X1<<9);
		//清除EXTI
		EXTI->FPR1|=(0x1<<8);   //key3
		//清除终端挂起标志位，清除终端号
		GICD->ICPENDR[2]|=(0x1<<2); 			   //key3

		break;
	}
		//清除GICC
		GICC->EOIR=GICC_num;
}

main.c

cpp 复制代码

#include "uart.h"
#include "key.h"
int main()
{
	
	key_config();
	all_led_init();
	fan_init();
	sp_init();

    while(1)
    {
     	
	}

	return 0;
}