STM32定時器實現紅外接收與解碼

uint32_t TIM3_Over_Cnt = 0;//tim3溢出次數uint32_t TIM3_Sum_Cnt = 0;//兩次下降沿之間的時間間隔uint32_t cnt0 = 0;uint8_t IR_Data[60];
void TIM3_IRQHandler(void){  /* USER CODE BEGIN TIM3_IRQn 0 */
  /* USER CODE END TIM3_IRQn 0 *///  HAL_TIM_IRQHandler(&htim3);  /* USER CODE BEGIN TIM3_IRQn 1 */    if(__HAL_TIM_GET_FLAG(&htim3, TIM_FLAG_UPDATE))      //定時器溢出中斷    {        __HAL_TIM_CLEAR_FLAG(&htim3, TIM_FLAG_UPDATE);    //清除中斷標記        TIM3_Over_Cnt++;    }    cnt0 = __HAL_TIM_GET_COUNTER(&htim3);    TIM3_Sum_Cnt = (TIM3_Over_Cnt << 16) + cnt0;//獲取計數器的值    __HAL_TIM_SetCounter(&htim3,0);//清零重新計數    TIM3_Over_Cnt = 0;//清零重新計數
    if (__HAL_TIM_GET_FLAG(&htim3, TIM_FLAG_CC1) != RESET)//TIM3CH1捕獲中斷    {       if(StartRevFlag == 1)//接收到引導碼，開始解碼       {         if(TIM3_Sum_Cnt > 36000)//大于36ms認為是結束         {           RevComplete = 1;//解碼完成           IR_Tick = 0;         }         else if(RevComplete == 0)         {           if(TIM3_Sum_Cnt > 1000 && TIM3_Sum_Cnt < 1300)//1ms~1.3ms認為是低電平            IR_Data[IR_Idx] = 0;           else  if(TIM3_Sum_Cnt > 2100 && TIM3_Sum_Cnt < 2400)//2.1ms~2.4ms認為是高電平            IR_Data[IR_Idx] = 1;           else //接收錯誤，重新開始             StartRevFlag = 0;           IR_Idx++;           if(IR_Idx > 59)             IR_Idx = 59;        }
       }       else       {         if(TIM3_Sum_Cnt > 13000 && TIM3_Sum_Cnt < 14000)//13~14ms引導碼         {           StartRevFlag = 1;         }         IR_Tick = 0;         RevComplete = 0;//解碼完成標志置零         IR_Idx = 0;//有效解碼位         TIM3_Over_Cnt = 0;         TIM3_Sum_Cnt = 0;//定時器計數清零       }        __HAL_TIM_CLEAR_IT(&htim3, TIM_IT_CC1);    }
  /* USER CODE END TIM3_IRQn 1 */}

void IR_Rev(){  uint8_t num = IR_Idx / 8;  uint8_t IRValue[8];
  if(RevComplete == 1 && StartRevFlag == 1 && IR_Tick > 20)  {    if(num > 7)      num = 7;
    for(uint8_t j=0;j    {      for(uint8_t i = 0;i< 8;i++)      {        IRValue[j] = IRValue[j]>>1;        if(IR_Data[j*8+i])          IRValue[j] |= 0x80;      }    }    if(IRValue[0] == 0x00 && IRValue[1] == 0xFF)//地址碼正確    {??????switch(IRValue[2])//判斷數據碼      {        case 0x46:          KeyValue = S_key_Menu;          break;        case 0x43:          KeyValue = S_key_Set;          break;        case 0x40:          KeyValue = S_key_Rst;          break;        case 0x15:          KeyValue = S_key_Down;          break;        case 0x09:          KeyValue = S_key_Up;??????????break;      }    }    StartRevFlag = 0;    RevComplete = 0;    IR_Tick = 0;  }}