外部中断配置

#include "stm32f10x.h"                  // Device header

uint16_t CountSensor_Count;

void CountSensor_Init(void)
{
	//RCC--> GPIO--> AFIO--> EXTI--> NVIC五步
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);  //开启GPIOB时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);  //开启AFIO时钟
	/******************************************
	 EXTI和NVIC默认时钟是打开的
	******************************************/
	//配置GPIOB端口模式和初始化
	GPIO_InitTypeDef GPIO_InitStructure;  //定义一个结构体变量
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //配置GPIO的模式
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14; //选择需要的GPIO
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;// 配置GPIO的速度
	GPIO_Init(GPIOB,&GPIO_InitStructure);  //对GPIO进行初始化
	
	//配置AFIO端口模式和初始化
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource14); //打通AFIO的第14根数据选择器，开始进入EXTI电路
	
	//配置EXTI的电路
	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_Rising;
	EXTI_Init(&EXTI_InitStructure);
	
	//配置NVIC的电路
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //NVIC分组
	
	
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel =  EXTI15_10_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd =  ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //抢占优先级（分组2）
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //响应优先级
	NVIC_Init(&NVIC_InitStructure);

}

uint16_t CountSensor_Get(void)
{
	return CountSensor_Count;
}

void EXTI15_10_IRQHandler(void)  //中断函数的入口函数在Start中的startup_stm32f10x_md.s里面
{
	if (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_14) == 0)
	{
		CountSensor_Count++;
		
	}
	EXTI_ClearITPendingBit(EXTI_Line14);
}

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

实验总结：本实验主要利用外部中断来对传感器模块进行计次，外部中断触发计次累计，通过检测B14的下降沿来触发计次！