stm32 红外通信3 简

bsp_exti.c

#include "bsp_exti.h"

 static void NVIC_Configuration(void)  //中断优先级函数
{
  NVIC_InitTypeDef NVIC_InitStructure;
  
  /* 配置NVIC为优先级组1 */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);  //配置NVIC为优先级组1
   
  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn ;  //配置中断源：
  /*EXTI0_IRQn/EXTI1_IRQn/ EXTI2_IRQn/EXTI3_IRQn/EXTI4_IRQn/EXTI9_5_IRQn/EXTI15_10_IRQn*/        
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;  //配置抢占优先级
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;   //配置子优先级
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   //  使能中断通道
  NVIC_Init(&NVIC_InitStructure);                //写入结构体成员
  
}

 void remote_EXTI_init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure; //GPIO结构体
	EXTI_InitTypeDef EXTI_InitStructure;  //中断结构体

 	NVIC_Configuration();  //中断优先级函数

   //初始化GPIO
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE); //开启GPIO口的时钟//开启按键GPIO口的时钟
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;  // 哪个引脚
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //配置为浮空输入 
  GPIO_Init(GPIOE, &GPIO_InitStructure);  //写入结构体GPIO成员

   //初始化EXTI
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //开启复用GPIO口的时钟 //开启按键GPIO口的时钟
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource5); //选择EXTI的信号源GPIOE,pin5

  EXTI_InitStructure.EXTI_Line = EXTI_Line5; //选择中断源，引脚哪个就选择哪个
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;  //中断模式
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling; //上升沿和下降沿都触发
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;  //使能中断
  EXTI_Init(&EXTI_InitStructure);  //写入结构体中断成员

	}

remote.c

#include "remote.h"
#include "bsp_exti.h"

extern u32 count_100us;
u32	lt=0;  //记录低电平时间
u32	ht=0;  //记录低电平时间
u8	ind=0; //记录32个数据码
u8 	remotecode[32];  //数组来保存地址码，地址反码，数据码，数据反码

void	EXTI9_5_IRQHandler(void)  
{
	u8	triger;
		
	if(EXTI_GetITStatus(EXTI_Line5) != RESET) 
	{
		//清除中断标志位
		EXTI_ClearITPendingBit(EXTI_Line5); 
		triger=GPIO_ReadInputDataBit(GPIOE,GPIO_Pin_5);	//读取端口电平
		//上升沿
		if(triger==1)
		{
			lt=count_100us; //捕获上升沿时间
			count_100us=0;
		}	
		//下降沿
		else
		{
			ht=count_100us;	 //捕获下降沿时间
			count_100us=0;
			

			//=========================解码===========================//
			//判断前导码来了没有
			if(ind==0)
			{
				if((lt<100)&&(lt>80)&&(ht<50)&&(ht>40))  //判断前导码是否正确
				{
					ind++;
				}
			}
				else
			{
         if((lt<8)&&(lt>4)&&(ht<7)&&(ht>3)){remotecode[ind-1]=0;}         //如果低是600us,高是500us，表示0
         else if((lt<8)&&(lt>4)&&(ht<18)&&(ht>14)){remotecode[ind-1]=1;}  //如果低是600us,高是1600us，表示1
         else{ind=0;return;}  //否则解码失败，退出
				ind++;
				if(ind>=33)  //总共有32个高低电平
				{
					ind=0;
					if(remotecode[18]==1&&remotecode[19]==1){LED1_ON;}  //判断数据位是否正确
					else{LED1_OFF;}
				}
			}
		}
	}  
}