STM32单片机入门学习（七）-外部中断-光敏计数

?光敏传感器模块:

光敏传感模块一DO端接B14,GND接GND，VCC接VCC,AO不接。

OLED：

OLED:SCL接B12,SDA接B13

如图：

main.c?

#include "stm32f10x.h"
#include "Delay.h"     //delay函数所在头文件
#include "OLED.h"
#include "LightSensor.h"


int main(void)
{
	OLED_Init();
	
	LightSensor_Init();
	
	while(1)
		{
			OLED_ShowString(1,3,"count:");
			OLED_ShowNum(2,3,get_LightSensorCount(),6);
			OLED_ShowString(3,3,"state:");
			OLED_ShowNum(4,3,get_LightSensorNum(),6);
		}
}

?LightSensor.c

#include "stm32f10x.h"
#include "Delay.h" 

uint16_t  LightSensorCount;
uint16_t flag;

//初始化LightSensor
void LightSensor_Init(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);  //设置时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);  //配置AFIO中断引脚
	
	GPIO_InitTypeDef GPIOInitStruct;
	GPIOInitStruct.GPIO_Mode = GPIO_Mode_IPU;    //上拉模式
	GPIOInitStruct.GPIO_Pin = GPIO_Pin_14;     //B14
	GPIOInitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIOInitStruct);
	
	
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource14);      //配置AFIO中断引脚
	
	
	//配置EXTI	
	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_PriorityGroupConfig(NVIC_PriorityGroup_2);   //中断分组
	NVIC_InitTypeDef NVIC_InitStruct;
	NVIC_InitStruct.NVIC_IRQChannel=EXTI15_10_IRQn;
	NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;   //抢占优先级
	NVIC_InitStruct.NVIC_IRQChannelSubPriority=1;   //响应优先级
	NVIC_Init(&NVIC_InitStruct);
	
	flag=0;
	LightSensorCount=0;
}



//获取传感器结果
uint16_t get_LightSensorCount(void)
{
	return LightSensorCount;
}


uint16_t get_flag(void)
{
	return flag;
}

//获取传感器结果
uint8_t get_LightSensorNum(void)
{
	return GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_14);
}


void EXTI15_10_IRQHandler(void)
{
	
	if(EXTI_GetITStatus(EXTI_Line14) == SET)
	{
		if(get_LightSensorNum()==1)
		{
				Delay_ms(50);
				if(get_LightSensorNum()==1)
				{
							LightSensorCount++;
							flag=1;	
				}
				else
				{
							flag=0;			
				}

		}

		
		EXTI_ClearITPendingBit(EXTI_Line14);

	}

}

?LightSensor.h

#ifndef __LIGHTSENSOR_H
#define __LIGHTSENSOR_H


void LightSensor_Init(void);
unsigned char get_LightSensorNum(void);
uint16_t get_LightSensorCount(void);
uint16_t get_flag(void);
	
#endif

运行效果：