按下按键之后，打印一句话------＞三个按键需要实现

原创已于 2023-02-23 17:25:12 修改 · 161 阅读

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#单片机 #stm32 #嵌入式硬件

于 2023-02-22 20:51:46 首次发布

该代码示例展示了在STM32MP1xx微处理器上如何初始化EXTI和GIC中断控制器，以及如何处理按键按下事件。当按键1、2或3被按下时，程序会通过中断服务函数打印对应的序列（11111111、222222222、333333333）。

按下按键之后，打印一句话------>三个按键需要实现

例如：当按键1按下之后，打印11111111

头文件

#ifndef __KEY_H__
#define __KEY_H__

#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"

//EXIT控制器初始化
void hal_exti_init();
//GICD控制器初始化
void hal_gicd_init();
//GICC控制器初始化
void hal_gicc_init();


#endif

源文件

#include "key.h"

//EXTI控制器初始化
void hal_exti_init(){
	//RCC章节初始化
	RCC->MP_AHB4ENSETR |= (0x1<<5);   

	//GPIO章节初始化
	GPIOF->MODER &= (~(0x3<<18));   //KEY1初始化
	GPIOF->MODER &= (~(0x3<<14));   //KEY2初始化
	GPIOF->MODER &= (~(0x3<<16));   //KEY3初始化

	//EXTI章节初始化
	EXTI->EXTICR3 |= (0x05<<8);  //KEY1->EXTI_EXTICR3
	EXTI->EXTICR2 |= (0x05<<24);  //KEY2->EXTI_EXTICR3
	EXTI->EXTICR3 |= (0x05<<0);  //KEY3->EXTI_EXTICR3

	EXTI->FTSR1 |= (0x1<<9);   //KEY1->EXTI_FTSR1
	EXTI->FTSR1 |= (0x1<<7);   //KEY2->EXTI_FTSR1
	EXTI->FTSR1 |= (0x1<<8);   //KEY3->EXTI_FTSR1

	EXTI->C1IMR1 |= (0x1<<9); //KEY1->EXTI_IMR1
	EXTI->C1IMR1 |= (0x1<<7); //KEY2->EXTI_IMR1
	EXTI->C1IMR1 |= (0x1<<8); //KEY3->EXTI_IMR1
}

//GICD控制器初始化
void hal_gicd_init(){
	GICD->CTRL |= (0x1<<0);  //GICD_CTLR
	
	GICD->ISENABLER[3] |= (0x1<<3);  //KEY1->GICD_ISENABLER
	GICD->ISENABLER[3] |= (0x1<<1);  //KEY2->GICD_ISENABLER
	GICD->ISENABLER[3] |= (0x1<<2);  //KEY3->GICD_ISENABLER

	GICD->IPRIORITYR[24] |= (0x11<<27);  //KEY1->GICD_IPRIORITYR
	GICD->IPRIORITYR[24] |= (0x13<<11);  //KEY2->GICD_IPRIORITYR
	GICD->IPRIORITYR[24] |= (0x15<<19);  //KEY3->GICD_IPRIORITYR

	GICD->ITARGETSR[24] |= (0x3<<24);      //KEY1->GICD_ITARGETSR
	GICD->ITARGETSR[24] |= (0x3<<8);      //KEY2->GICD_ITARGETSR
	GICD->ITARGETSR[24] |= (0x3<<16);     //KEY3->GICD_ITARGETSR
}

//GICC控制器初始化
void hal_gicc_init(){
	GICC->CTRL |= (0x1<<0);   //GICC_CTRL

	GICC->PMR |= (0x1f<<3);    //GICC_PMR
}

main.c

#include "key.h"
extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
	int i,j;
	for(i = 0; i < ms;i++)
		for (j = 0; j < 1800; j++);
}

int main()
{
	hal_exti_init();
	hal_gicd_init();
	hal_gicc_init();
	while(1)
	{

	}
	return 0;
}

do_irq.c

#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
	//获取中断号
	//判断中断号
	//99：KEY1按键按下
	//清除中断挂起标志位
	int i=0;
	i = GICC->IAR & 0x3ff;
	if(99 == i){       //KEY1
		printf("111111111\n");
		EXTI->FPR1 |= (0x1<<9); 
		GICD->ICPENDR[3] |= (0x1<<3);
		GICC->EOIR = i;
	}else if(97 == i){    //KEY2
		printf("222222222\n");
		EXTI->FPR1 |= (0x1<<7); 
		GICD->ICPENDR[3] |= (0x1<<1);
		GICC->EOIR = i;
	}else if(98 == i){    //KEY3
		printf("333333333\n");
		EXTI->FPR1 |= (0x1<<8); 
		GICD->ICPENDR[3] |= (0x1<<2);
		GICC->EOIR = i;
	}
}