整理了一個NEC協議的紅外程式，NEC協議，物理環境為F103原子戰艦V3，使用STM32CubeMX生成初始程式。

定時器配置72分頻，9999裝載值（10MS）

NEC協議：

資料格式： 同步碼頭 + 地址碼 +地址反碼 + 按鍵碼 + 按鍵反碼 （LSB先行）

同步碼頭：9ms低電平 + 4.5ms高電平

連發碼 ：   9ms低電平 + 2.5ms高電平

邏輯1：      560us  +  1680us

邏輯0：      560us  +  560us

程式：

標頭檔案：

#ifndef __Fun_Infrared_H
#define __Fun_Infrared_H


#include "stm32f1xx_hal.h"
#include "tim.h"


#define  RangJudge(val,min,max)   (val>min? (val<max? 1 : 0) : 0)


typedef struct T4_Infrared
{
        uint32_t  KEY_VALUE;   //記錄32位地址以及按鍵碼
	uint16_t  TriTime[2];  //記錄電平持續時間 0：低電平  1:高電平
	uint8_t   DataBit;
	uint8_t   FrameStart;
        uint8_t   KEY_Count;	
	uint8_t   TriPolarity;
	
}T4_InfraredDev;


extern T4_InfraredDev  *T4Infra;






void T4InfraInit(void);

void TIM4_InfraPeriodHandle(void);

void TIM4_InfraCaptureHandle(void);

uint8_t  GetInfraredKey(void);
	
uint8_t  GetInfraredAddr(void);

#endif

 

原始檔：

#include "Fun_Infrared.h"


T4_InfraredDev  T4Infra_S, *T4Infra = &T4Infra_S;


void T4InfraInit(void)
{
        HAL_TIM_IC_Start_IT(&htim4, TIM_CHANNEL_4);
	__HAL_TIM_ENABLE_IT(&htim4, TIM_IT_UPDATE);  //使能更新中斷
	
	T4Infra->TriPolarity = 0;
	T4Infra->FrameStart = 0;
}


//改變TIM4 CHANNEL4的捕獲極性
void TIM_OC4PolarityConfig(TIM_TypeDef* TIMx, uint16_t TIM_OCPolarity)
{
  uint16_t tmpccer = 0;

  tmpccer = TIMx->CCER;

  tmpccer &= (uint16_t)~((uint16_t)TIM_CCER_CC4P);
  tmpccer |= (uint16_t)(TIM_OCPolarity << 12);

  TIMx->CCER = tmpccer;
}


//捕獲中斷處理函式
void TIM4_InfraPeriodHandle(void)
{
	T4Infra->TriPolarity = 0;
        T4Infra->FrameStart = 0;
	T4Infra->TriTime[0] = 0;
	T4Infra->TriTime[1] = 0;
}


//捕獲中斷處理函式
void TIM4_InfraCaptureHandle(void)
{

	  T4Infra->TriPolarity = !T4Infra->TriPolarity;
	
	  /************************** 切換極性以及捕獲電平持續時間 **************************/
	
	     if(!T4Infra->TriPolarity)  //上升沿觸發
		{
			TIM_OC4PolarityConfig(TIM4, TIM_INPUTCHANNELPOLARITY_FALLING);			
			
			T4Infra->TriTime[T4Infra->TriPolarity] = \
                        HAL_TIM_ReadCapturedValue(&htim4, TIM_CHANNEL_4);			
		}
		else  //下降沿觸發
		{
			TIM_OC4PolarityConfig(TIM4, TIM_INPUTCHANNELPOLARITY_RISING);
			
                         if(T4Infra->FrameStart == 1) 
			{
                             T4Infra->TriTime[T4Infra->TriPolarity] = \
                             HAL_TIM_ReadCapturedValue(&htim4, TIM_CHANNEL_4);
			}					
			
                        T4Infra->FrameStart = 1;	//開始接收幀	   			
		}	
		
		TIM4->CNT = 0; 	//清除TIM4計數值

	  /**************************** 判斷同步碼以及重複碼 ***************************/
		
		if(RangJudge(T4Infra->TriTime[0],8500,9500) && \
                   RangJudge(T4Infra->TriTime[1],4000,5000) ) 
		{
			 T4Infra->KEY_VALUE = 0;  //同步碼
			 T4Infra->KEY_Count = 0;  
                         T4Infra->DataBit = 0;  		
		}		
		else if(RangJudge(T4Infra->TriTime[0],8500,9500) && \
                        RangJudge(T4Infra->TriTime[1],2000,3000) ) 
		{
			 if(++T4Infra->KEY_Count > 250) T4Infra->KEY_Count = 250;    //連發碼
		}
	
	  /********************************* 接收資料 *********************************/		
		if( T4Infra->TriPolarity == 1) 
		{
                      if(RangJudge(T4Infra->TriTime[0],450,650) && \
                         RangJudge(T4Infra->TriTime[1],450,650) ) 
			{
			   T4Infra->KEY_VALUE &= ~(1<T4Infra->DataBit++);
			}
			 
                        else if(RangJudge(T4Infra->TriTime[0],450,650) && \
                              RangJudge(T4Infra->TriTime[1],1450,1750) ) 
			{
			   T4Infra->KEY_VALUE |= 1<<T4Infra->DataBit++;
			}
		}	
		
		
}


//獲取按鍵值
uint8_t  GetInfraredKey(void)
{
   //通過與反碼異或，驗證按鍵碼的正確性
   if( (uint8_t)( (T4Infra->KEY_VALUE >> 24) ^ (T4Infra->KEY_VALUE >> 16) ) == 0xff  )
   return (uint8_t)(T4Infra->KEY_VALUE>>16);
	 
   else  return 0;
}


//獲取地址
uint8_t  GetInfraredAddr(void)
{
   if( (uint8_t)( (T4Infra->KEY_VALUE ) ^ (T4Infra->KEY_VALUE >> 8) ) == 0xff  )
   return (uint8_t)(T4Infra->KEY_VALUE);
	 
   else  return 0;
}

 

主函式：

#include "Fun_Infrared.h"

int main(void)
{
  HAL_Init();


  SystemClock_Config();

  MX_GPIO_Init();
  MX_TIM4_Init();
  MX_USART1_UART_Init();

  T4InfraInit();  //啟動TIM4

  while (1)
  {
		printf("按鍵次數：%d\r\n",T4Infra->KEY_Count);
                printf("鍵值：0x%02X\r\n",GetInfraredKey() );
		printf("地址：0x%02X\r\n",GetInfraredAddr() );
		HAL_Delay(2000);
  }

}



//更新中斷
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
    if(htim->Instance == TIM4)
	{
	  TIM4_InfraPeriodHandle();
	}
}



//捕獲中斷
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{

    if(htim->Instance == TIM4)
	{
		TIM4_InfraCaptureHandle();
	}
}
 

實驗現象：