06_EXTI外部中断

EXTI外部中断

中断系统

中断执行流程

STM32中断

NVIC基本结构

NVIC优先级分组

EXTI简介

EXTI基本结构

AFIO复用IO口

xxxxxxxxxx #include "stm32f10x.h"                  // Device header#include "Delay.h"#include "OLED.h"​int main(void){ OLED_Init(); OLED_ShowChar(1,1,'A'); OLED_ShowString(1,3,"HelloWorld!"); OLED_ShowNum(2,1,12345,5); OLED_ShowSignedNum(2,7,-12345,5); OLED_ShowHexNum(3,1,0xAA55,4); OLED_ShowBinNum(4,1,0xAA55,16); OLED_Clear(); while(1) { }}c

旋转编码器介绍

硬件电路

对射式红外传感器计次

接线图

代码

CountSensor.c

#include "stm32f10x.h"                  // Device header

uint16_t CountSensor_Count;

void CountSensor_Init(void)
{
	/*开启时钟*/
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); //开启GPIOB的时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //开启AFIO的时钟
	
	/*GPIO初始化*/
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPU; //上拉输入
	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_14;
	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOB,&GPIO_InitStruct);
	
	/*AFIO选择中断引脚**/
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource14);
	
	/*EXTI初始化*/
	EXTI_InitTypeDef EXTI_InitStruct;
	EXTI_InitStruct.EXTI_Line=EXTI_Line14;
	EXTI_InitStruct.EXTI_LineCmd=ENABLE;
	EXTI_InitStruct.EXTI_Mode=EXTI_Mode_Interrupt;
	EXTI_InitStruct.EXTI_Trigger=EXTI_Trigger_Falling;
	EXTI_Init(&EXTI_InitStruct);
	
	/*NVIC中断分组**/
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	
	/*NVIC配置*/
	NVIC_InitTypeDef NVIC_InitStruct;
	NVIC_InitStruct.NVIC_IRQChannel=EXTI15_10_IRQn;
	NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;
	NVIC_InitStruct.NVIC_IRQChannelSubPriority=1;
	NVIC_Init(&NVIC_InitStruct);
}

uint16_t CountSensor_Get(void)
{
	return CountSensor_Count;
}

void EXTI15_10_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line14)==SET)
	{
		if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14)==0)
		{
			CountSensor_Count++;
		}

		EXTI_ClearITPendingBit(EXTI_Line14);
	}
}

CountSensor.h

#ifndef __COUNT_SENSOR_H
#define __COUNT_SENSOR_H

void CountSensor_Init(void);
uint16_t CountSensor_Get(void);

#endif

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "CountSensor.h"

int main(void)
{
	OLED_Init();
	CountSensor_Init();
	OLED_ShowString(1,1,"Count:");
	while(1)
	{
		OLED_ShowNum(1,7,CountSensor_Get(),5);
	}
}

旋转编码器计次

接线图

原理图

代码

Encoder.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"

int16_t Encoder_Count;

void Encoder_Init(void)
{
	/*开启时钟*/
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); //开启GPIOB的时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //开启AFIO的时钟
	
	/*GPIO初始化*/
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPU; //上拉输入
	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_0 | GPIO_Pin_1;
	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOB,&GPIO_InitStruct);
	
	/*AFIO选择中断引脚**/
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1);
	
	/*EXTI初始化*/
	EXTI_InitTypeDef EXTI_InitStruct;
	EXTI_InitStruct.EXTI_Line=EXTI_Line0 | EXTI_Line1;
	EXTI_InitStruct.EXTI_LineCmd=ENABLE;
	EXTI_InitStruct.EXTI_Mode=EXTI_Mode_Interrupt;
	EXTI_InitStruct.EXTI_Trigger=EXTI_Trigger_Falling;
	EXTI_Init(&EXTI_InitStruct);
	
	/*NVIC中断分组**/
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	
	/*NVIC配置*/
	NVIC_InitTypeDef NVIC_InitStruct;
	
	NVIC_InitStruct.NVIC_IRQChannel=EXTI0_IRQn;
	NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;
	NVIC_InitStruct.NVIC_IRQChannelSubPriority=1;
	NVIC_Init(&NVIC_InitStruct);
	
	NVIC_InitStruct.NVIC_IRQChannel=EXTI1_IRQn;
	NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;
	NVIC_InitStruct.NVIC_IRQChannelSubPriority=2;
	NVIC_Init(&NVIC_InitStruct);
}

int16_t Encoder_Get(void)
{
	int16_t Temp;
	Temp = Encoder_Count;
	Encoder_Count=0;
	return Temp;
}

void EXTI0_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line0)==SET)
	{
		Delay_ms(2); //消抖
		if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_1)==0)
		{
			Encoder_Count--;
		}
		EXTI_ClearITPendingBit(EXTI_Line0);
	}
}

void EXTI1_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line1)==SET)
	{
		Delay_ms(2); //消抖
		if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0)==0)
		{
			Encoder_Count++;
		}
		EXTI_ClearITPendingBit(EXTI_Line1);
	}
}

Encoder.h

#ifndef __ENCODER_H__
#define __ENCODER_H__

void Encoder_Init(void);
int16_t Encoder_Get(void);

#endif

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "Encoder.h"

int16_t Num;

int main(void)
{
	OLED_Init();
	Encoder_Init();
	OLED_ShowString(1,1,"Num:");
	while(1)
	{
		Num += Encoder_Get();
		OLED_ShowSignedNum(1,5,Num,5);
	}
}