STM32F103定時器輸入捕獲解碼9148遙控器程序

ID:668227 · 發表于 2019-12-20 11:15

一，定時器初始化
/*******************************************************************************
* 函數名       : time1_init
* 函數功能                : 定時器1端口初始化函數
* 輸入       : 無
* 輸出       : 無
*******************************************************************************/
void time1_init()
{
      TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;       //聲明一個結構體變量，用來初始化GPIO

      TIM_ICInitTypeDef TIM1_ICInitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      /* 開啟定時器1時鐘 */
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

      TIM_ClearITPendingBit(TIM1,TIM_IT_Update);//清除TIMx的中斷待處理位:TIM 中斷源
      TIM_TimeBaseInitStructure.TIM_Period =9999;//設置自動重裝載寄存器周期的值100MS
      TIM_TimeBaseInitStructure.TIM_Prescaler = 719;//設置用來作為TIMx時鐘頻率預分頻值，100Khz計數頻率
      TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;//0; //設置時鐘分割:TDTS = Tck_tim
      TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;//TIM向上計數模式
      TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStructure);

      /* 設置中斷參數，并打開中斷 */
      TIM1_ICInitStructure.TIM_Channel = TIM_Channel_4; //捕獲通道
      TIM1_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //xia沿捕獲
      TIM1_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //直接映射
      TIM1_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //不分頻每個變化捕獲
      TIM1_ICInitStructure.TIM_ICFilter = 0x00;//不濾波
      TIM_ICInit(TIM1, &TIM1_ICInitStructure);

      /* 設置NVIC參數 */
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
      NVIC_InitStructure.NVIC_IRQChannel=TIM1_CC_IRQn; ////TIM1 捕獲中斷
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;       //搶占優先級為0
      NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;  //響應優先級為1
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;       //使能
      NVIC_Init(&NVIC_InitStructure);

      TIM_ITConfig(TIM1,TIM_IT_Update|TIM_IT_CC4,ENABLE);    //使能更新中斷和捕獲中斷

      TIM_Cmd(TIM1, ENABLE);       //使能定時器//使能或者失能TIMx外設

  TIM_ClearITPendingBit(TIM1, TIM_IT_Update|TIM_IT_CC4 );    //清除標識
}
二、中斷處理

/* 遙控器解碼

*/
void TIM1_CC_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) //檢查TIM1更新中斷標識
  {

                        overflow++;
  }

  if (TIM_GetITStatus(TIM1, TIM_IT_CC4) != RESET) //檢查TIM1通道4捕獲標識
  {
            if(state==WAIT_FALLING) // 捕獲下降沿
            {
                     TIM1CH4_CAPTURE_VAL = TIM_GetCapture4(TIM1);//獲得輸入捕獲的值
                     yktimvalue = TIM1CH4_CAPTURE_VAL + (overflow*720);
                     //判斷高電平持續時間大于 208a-87776vs  80a=33760vs/3520  a=422vs                      3a=1266 vs
                     if(yktimvalue>8770)
                     {
                              ykaj_num = 0;
                              ykaj_value= 0;
                     }
                     overflow = 0;
                     TIM_SetCounter(TIM1,0);
                     state = WAIT_RISING;
                     TIM_OC4PolarityConfig(TIM1,TIM_ICPolarity_Rising); //設置上升沿觸發
            }
            else if(state==WAIT_RISING) //捕獲上升沿
            {
                     TIM1CH4_CAPTURE_VAL = TIM_GetCapture4(TIM1);
                     yktimvalue = TIM1CH4_CAPTURE_VAL;

                     //判斷低電平持續時間 422 1266 vs
                     if(yktimvalue>40 && yktimvalue<50)
                     {
                              ykaj_bit=0;//收到數據 0
                     }
                     else if(yktimvalue>125 && yktimvalue<135)
                     {
                              ykaj_bit=1;//收到數據 1
                     }
                     ykaj_value<<=1;
                     ykaj_value+=ykaj_bit;
                     ykaj_num++;
                     if(ykaj_num>=24)
                     {
                              yk_keys       =(u16)ykaj_value;
                              yk_keys&=0x0fff;
                              ykaj_value>>=12;
                              if(yk_keys==(u16)ykaj_value)
                              {
                                    ykaj_bzok=1;
                              }
                              else
                              {
                                    ykaj_num = 0;
                                    ykaj_value= 0;
                              }
                     }
                     if(yktimvalue<40 || yktimvalue>135)
                     {
                              ykaj_num = 0;
                              ykaj_value= 0;
                     }

                     overflow = 0;
                     TIM_SetCounter(TIM1,0);
                     state = WAIT_FALLING;
                     TIM_OC4PolarityConfig(TIM1,TIM_ICPolarity_Falling); //設置下降沿觸發
            }
  }

  TIM_ClearITPendingBit(TIM1, TIM_IT_Update|TIM_IT_CC4 );    //清除標識

}

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STM32F103定時器輸入捕獲解碼9148遙控器程序

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