一、接线
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。
二、代码
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
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);
}
}
编译运行成功后,即可看到每遮挡一次,OLED显示的数字便会加一。
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