STM32 study notes (9)

STM32F103ZET6 external interrupt experiment

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Preface

The learning of STM32 can be divided into 3 versions.
1. Register version
2. Library function version
3. HAL library version
Due to personal reasons, I choose the library function version to learn STM32.

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Tip: Problems such as software installation will not be explained! ! !

1. Schematic

Two, external interrupt configuration steps

Three, program source code

1.exti.h

code show as below:

#ifndef __EXTI_H
#define __EXTI_H

void EXTIX_Init(void);//步骤1-5

#endif

2.exti.c

code show as below:

#include "exti.h"
#include "led.h"
#include "key.h"
#include "usart.h"
#include "beep.h"
#include "delay.h"

void EXTIX_Init()
{
    
    
	EXTI_InitTypeDef EXTI_Initstr;
	NVIC_InitTypeDef NVIC_Initstr;
	KEY_Init();//初始化IO
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);//开启IO口时钟复用
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource4);//设置IO口与中断线的映射关系
	
	EXTI_Initstr.EXTI_Line=EXTI_Line4;
	EXTI_Initstr.EXTI_LineCmd=ENABLE;
	EXTI_Initstr.EXTI_Mode=EXTI_Mode_Interrupt;
	EXTI_Initstr.EXTI_Trigger=EXTI_Trigger_Falling;
	EXTI_Init(&EXTI_Initstr);//初始化线上中断，设置触发条件等
	
	NVIC_Initstr.NVIC_IRQChannel=EXTI4_IRQn;
	NVIC_Initstr.NVIC_IRQChannelCmd=ENABLE;
	NVIC_Initstr.NVIC_IRQChannelPreemptionPriority=2;
	NVIC_Initstr.NVIC_IRQChannelSubPriority=2;
	NVIC_Init(&NVIC_Initstr);//配置中断分组
}
void EXTI4_IRQHandler(void)
{
    
    
	delay_ms(10);
	if(KEY0==0)
	{
    
    
		LED1=!LED1;
	}
	EXTI_ClearITPendingBit(EXTI_Line4);
}

3.main.c

code show as below:

#include "stm32f10x.h"
#include "led.h"
#include "delay.h"
#include "beep.h"
#include "key.h"
#include "usart.h"
#include "exti.h"


int main(void)
{
    
    
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	delay_init();
    LED_Init();
	Beep_Init();
	KEY_Init();
	uart_init(115200);
	EXTIX_Init();
	while(1)
	{
    
    
		printf("OK\r\n");
		delay_ms(1000);
	}
		
}

4. Experimental results

When the KEY0 button is pressed, the LED1 turns on and off. (Interrupt service function)

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to sum up

Time flies so fast. The first semester of junior year has passed. Even though the winter vacation is on, I still feel that I am very busy every day. One is to study stm32, and the other is to prepare for postgraduate entrance exams. I feel that junior and freshman, sophomore really It's different. I don't have the desire to play basketball at the slightest point. I am afraid that my time will pass by. In short, I hope that the postgraduate entrance examination can be successfully landed in 2022! Come on