江科大stm32学习笔记10——对射式红外传感器

本文介绍: 上电之后可以看到对射式红外传感器亮两个灯，如果此时用挡光片挡住两个黑色方块中间的部分，则只亮一个灯。

上电之后可以看到对射式红外传感器亮两个灯，如果此时用挡光片挡住两个黑色方块中间的部分，则只亮一个灯。

将4-1的工程文件夹复制粘贴一份，重命名为“5-1 对射式红外传感器计次”，打开keil，右键添加“CountSensor.c”及“CountSensor.h”到“Hardware”文件夹，注意更改文件路径。

CountSensor.c：

#include "stm32f10x.h"                  // Device header

uint16_t CountSensor_Count;

void CountSensor_Init(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
	
	GPIO_InitTypeDef GPIO_InitStruture;
	GPIO_InitStruture.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_InitStruture.GPIO_Pin = GPIO_Pin_14;
	GPIO_InitStruture.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB,&GPIO_InitStruture);
	
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource14);
	
	EXTI_InitTypeDef EXTI_InitStructure;
	EXTI_InitStructure.EXTI_Line = EXTI_Line14;
	EXTI_InitStructure.EXTI_LineCmd = ENABLE;
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
	EXTI_Init(&EXTI_InitStructure);
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_Init(&NVIC_InitStructure);
}

uint16_t CountSensor_Get(void)
{
	return CountSensor_Count;
}

void EXTI15_10_IRQHandler(void)
{
	if (EXTI_GetITStatus(EXTI_Line14) == SET)
	{
		CountSensor_Count ++;
		EXTI_ClearITPendingBit(EXTI_Line14);
	}
}

这里我们需要开启GPIOB和AFIO的引脚，并对EXTI中断进行配置。最后这个中断函数的名称不能更改，建议在开始文件中复制粘贴过来。

CountSensor.h：

#ifndef __COUNT_SENSOR_H
#define __COUNT_SENSOR_H

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

#endif

#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);
	}
}