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標題: STM8 PWM輸入捕捉完成程序 [打印本頁]

作者: 俠行江湖 時間: 2016-2-2 16:44
標題: STM8 PWM輸入捕捉完成程序
大家好，最近在做一個項目關于PWM輸入捕捉的，使用的單片機為STM8S105，我在用STM8的輸入捕捉功能利用庫函數TIME1 CH1 捕捉PE0的頻率很準，但是我在此程序基礎上將PE0口的頻率改為由 TIME2 產生，同樣使用TIME1 CH1 捕捉，捕捉到的頻率不對是怎么回事？ TIME2 產生的PWM 用示波器測試很準的望高手指點，謝謝！�。。。。�

庫函數捕捉程序如下：
void main(void)
{
  TIM1_Channel = TIM1_CHANNEL_1
  TIM1_ICPolarity = TIM1_ICPOLARITY_FALLING
  TIM1_ICSelection = TIM1_ICSELECTION_DIRECTTI
  TIM1_ICPrescaler = TIM1_ICPSC_DIV8
  TIM1_ICFilter = 0x0
  TIM1_ICInit( TIM1_CHANNEL_1, TIM1_ICPOLARITY_FALLING, TIM1_ICSELECTION_DIRECTTI,  TIM1_ICPSC_DIV8, 0x0);
  TIM1_ITConfig(TIM1_IT_CC1, ENABLE);
/* Enable TIM1 */
  TIM1_Cmd(ENABLE);
/* Clear CC1 Flag*/
  TIM1_ClearFlag(TIM1_FLAG_CC1);
/* Connect LSI to COO pin*/
  GPIO_Init(GPIOE, GPIO_PIN_0, GPIO_MODE_OUT_PP_LOW_FAST);
  CLK_CCOConfig(CLK_OUTPUT_LSI);
  CLK_CCOCmd(ENABLE);
  /* wait a capture on CC1 */
  while((TIM1->SR1 & TIM1_FLAG_CC1) != TIM1_FLAG_CC1);
  /* Get CCR1 value*/
      ICValue1 = TIM1_GetCapture1();
      TIM1_ClearFlag(TIM1_FLAG_CC1);

      /* wait a capture on cc1 */
  while((TIM1->SR1 & TIM1_FLAG_CC1) != TIM1_FLAG_CC1);
  /* Get CCR1 value*/
      ICValue2 = TIM1_GetCapture1();
      TIM1_ClearFlag(TIM1_FLAG_CC1);

  /* Compute LSI clock frequency */
  LSIClockFreq = (8 * TIM1ClockFreq) / (ICValue2 - ICValue1);

/* Insert a break point here */
      while (1);
}

在此庫函數基礎上，改為TIME2產生PWM程序如下，
void init_hsiclk(void)
{
CLK_DeInit(); //寄存器復位
CLK_HSICmd(ENABLE); //內部高速時鐘使能
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1); //內部分頻 2M
}

void TIM2_init(void)
{
  TIM2_TimeBaseInit(TIM2_PRESCALER_16, 6665);
  TIM2_OC3Init(TIM2_OCMODE_PWM1, TIM2_OUTPUTSTATE_ENABLE,CCR3_Val, TIM2_OCPOLARITY_HIGH);
  TIM2_OC3PreloadConfig(ENABLE);
  TIM2_ARRPreloadConfig(ENABLE);
  TIM2_Cmd(ENABLE);
}
void main(void)
{

  //CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);//主時鐘16/16=1MHZ 4分頻
      init_hsiclk();
      GPIO_Init(TIME2PWMOUT_PORT, TIME2PWMOUT_PIN , GPIO_MODE_OUT_PP_LOW_FAST);    //設置PA3端口為推挽輸出模式
      GPIO_Init(TIME1PWMIN_PORT , TIME1PWMIN_PIN, GPIO_MODE_IN_FL_NO_IT);
  TIM2_init();
      TIM1_ICInit( TIM1_CHANNEL_1, TIM1_ICPOLARITY_FALLING, TIM1_ICSELECTION_DIRECTTI,  TIM1_ICPSC_DIV8, 0x0);

      /* Enable CC1 interrupt */
      TIM1_ITConfig(TIM1_IT_CC1, ENABLE);
      /* Enable TIM1 */
  TIM1_Cmd(ENABLE);
      /* Clear CC1 Flag*/
  TIM1_ClearFlag(TIM1_FLAG_CC1);
      /* Connect LSI to COO pin*/
//GPIO_Init(GPIOE, GPIO_PIN_0, GPIO_MODE_OUT_PP_LOW_FAST); //不使用
      //CLK_CCOConfig(CLK_OUTPUT_LSI);
      //CLK_CCOCmd(ENABLE);

      /* wait a capture on CC1 */
  while((TIM1->SR1 & TIM1_FLAG_CC1) != TIM1_FLAG_CC1);
  /* Get CCR1 value*/
      ICValue1 = TIM1_GetCapture1();
      TIM1_ClearFlag(TIM1_FLAG_CC1);

      /* wait a capture on cc1 */
  while((TIM1->SR1 & TIM1_FLAG_CC1) != TIM1_FLAG_CC1);
  /* Get CCR1 value*/
      ICValue2 = TIM1_GetCapture1();
      TIM1_ClearFlag(TIM1_FLAG_CC1);

  /* Compute LSI clock frequency */
  LSIClockFreq = (8 * TIM1ClockFreq) / (ICValue2 - ICValue1);

      /* Insert a break point here */

      while (1);
}

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