stm32l1xx_tim.c

VS1003_MP3_SPI_SDHC_FAT32

/**
  * @brief  Configures the TIMx channel 3 polarity.
  * @param  TIMx: where x can be 2, 3, 4 or 5 to select the TIM peripheral.
  * @param  TIM_OCPolarity: specifies the OC3 Polarity.
  *   This parameter can be one of the following values:
  *     @arg TIM_OCPolarity_High: Output Compare active high.
  *     @arg TIM_OCPolarity_Low: Output Compare active low.
  * @retval None
  */
void TIM_OC3PolarityConfig(TIM_TypeDef* TIMx, uint16_t TIM_OCPolarity)
{
  uint16_t tmpccer = 0;
  
  /* Check the parameters */
  assert_param(IS_TIM_LIST3_PERIPH(TIMx));
  assert_param(IS_TIM_OC_POLARITY(TIM_OCPolarity));
  
  tmpccer = TIMx->CCER;
  /* Set or Reset the CC3P Bit */
  tmpccer &= (uint16_t)~((uint16_t)TIM_CCER_CC3P);
  tmpccer |= (uint16_t)(TIM_OCPolarity << 8);
  /* Write to TIMx CCER register */
  TIMx->CCER = tmpccer;
}

/**
  * @brief  Configures the TIMx channel 4 polarity.
  * @param  TIMx: where x can be 2, 3, 4 or 5 to select the TIM peripheral.
  * @param  TIM_OCPolarity: specifies the OC4 Polarity.
  *   This parameter can be one of the following values:
  *     @arg TIM_OCPolarity_High: Output Compare active high.
  *     @arg TIM_OCPolarity_Low: Output Compare active low.
  * @retval None
  */
void TIM_OC4PolarityConfig(TIM_TypeDef* TIMx, uint16_t TIM_OCPolarity)
{
  uint16_t tmpccer = 0;
  
  /* Check the parameters */
  assert_param(IS_TIM_LIST3_PERIPH(TIMx));
  assert_param(IS_TIM_OC_POLARITY(TIM_OCPolarity));
  
  tmpccer = TIMx->CCER;
  /* Set or Reset the CC4P Bit */
  tmpccer &= (uint16_t)~((uint16_t)TIM_CCER_CC4P);
  tmpccer |= (uint16_t)(TIM_OCPolarity << 12);
  /* Write to TIMx CCER register */
  TIMx->CCER = tmpccer;
}

/**
  * @brief  Selects the OCReference Clear source.
  * @param  TIMx: where x can be 2, 3, 4 or 5 to select the TIM peripheral.
  * @param  TIM_OCReferenceClear: specifies the OCReference Clear source.
  *   This parameter can be one of the following values:
  *     @arg TIM_OCReferenceClear_ETRF: The internal OCreference clear input is connected to ETRF.
  *     @arg TIM_OCReferenceClear_OCREFCLR: The internal OCreference clear input is connected to OCREF_CLR input.  
  * @retval None
  */
void TIM_SelectOCREFClear(TIM_TypeDef* TIMx, uint16_t TIM_OCReferenceClear)
{
  /* Check the parameters */
  assert_param(IS_TIM_LIST3_PERIPH(TIMx));
  assert_param(TIM_OCREFERENCECECLEAR_SOURCE(TIM_OCReferenceClear));

  /* Set the TIM_OCReferenceClear source */
  TIMx->SMCR &=  (uint16_t)~((uint16_t)TIM_SMCR_OCCS);
  TIMx->SMCR |=  TIM_OCReferenceClear;
}

/**
  * @brief  Enables or disables the TIM Capture Compare Channel x.
  * @param  TIMx: where x can be 2, 3, 4, 5, 9, 10 or 11 to select the TIM peripheral.
  * @param  TIM_Channel: specifies the TIM Channel.
  *   This parameter can be one of the following values:
  *     @arg TIM_Channel_1: TIM Channel 1.
  *     @arg TIM_Channel_2: TIM Channel 2.
  *     @arg TIM_Channel_3: TIM Channel 3.
  *     @arg TIM_Channel_4: TIM Channel 4.
  * @param  TIM_CCx: specifies the TIM Channel CCxE bit new state.
  *   This parameter can be: TIM_CCx_Enable or TIM_CCx_Disable. 
  * @retval None
  */
void TIM_CCxCmd(TIM_TypeDef* TIMx, uint16_t TIM_Channel, uint16_t TIM_CCx)
{
  uint16_t tmp = 0;

  /* Check the parameters */
  assert_param(IS_TIM_LIST1_PERIPH(TIMx)); 
  assert_param(IS_TIM_CCX(TIM_CCx));

  tmp = CCER_CCE_SET << TIM_Channel;

  /* Reset the CCxE Bit */
  TIMx->CCER &= (uint16_t)~ tmp;

  /* Set or reset the CCxE Bit */ 
  TIMx->CCER |=  (uint16_t)(TIM_CCx << TIM_Channel);
}

/**
  * @}
  */

/** @defgroup TIM_Group3 Input Capture management functions
 *  @brief    Input Capture management functions 
 *
@verbatim
 ===============================================================================
               ##### Input Capture management functions #####
 ===============================================================================
   
          *** TIM Driver: how to use it in Input Capture Mode ***
 ===============================================================================
    [..] To use the Timer in Input Capture mode, the following steps are mandatory:
         (#) Enable TIM clock using RCC_APBxPeriphClockCmd(RCC_APBxPeriph_TIMx, ENABLE) 
             function.
         (#) Configure the TIM pins by configuring the corresponding GPIO pins.
         (#) Configure the Time base unit as described in the first part of this 
             driver, if needed, else the Timer will run with the default configuration:
             (++) Autoreload value = 0xFFFF.
             (++) Prescaler value = 0x0000.
             (++) Counter mode = Up counting.
             (++) Clock Division = TIM_CKD_DIV1.
         (#) Fill the TIM_ICInitStruct with the desired parameters including:
             (++) TIM Channel: TIM_Channel.
             (++) TIM Input Capture polarity: TIM_ICPolarity.
             (++) TIM Input Capture selection: TIM_ICSelection.
             (++) TIM Input Capture Prescaler: TIM_ICPrescaler.
             (++) TIM Input CApture filter value: TIM_ICFilter.
         (#) Call TIM_ICInit(TIMx, &TIM_ICInitStruct) to configure the desired 
             channel with the corresponding configuration and to measure only 
             frequency or duty cycle of the input signal,or, Call 
             TIM_PWMIConfig(TIMx, &TIM_ICInitStruct) to configure the desired 
             channels with the corresponding configuration and to measure the 
             frequency and the duty cycle of the input signal.
         (#) Enable the NVIC or the DMA to read the measured frequency.
         (#) Enable the corresponding interrupt (or DMA request) to read 
             the Captured value, using the function TIM_ITConfig(TIMx, TIM_IT_CCx)
             (or TIM_DMA_Cmd(TIMx, TIM_DMA_CCx)).
         (#) Call the TIM_Cmd(ENABLE) function to enable the TIM counter.
         (#) Use TIM_GetCapturex(TIMx); to read the captured value.
    [..]
        (@) All other functions can be used separately to modify, if needed,
            a specific feature of the Timer. 

@endverbatim
  * @{
  */

/**
  * @brief  Initializes the TIM peripheral according to the specified
  *         parameters in the TIM_ICInitStruct.
  * @param  TIMx: where x can be 2, 3, 4, 5, 9, 10 or 11 to select the TIM peripheral.
  * @param  TIM_ICInitStruct: pointer to a TIM_ICInitTypeDef structure
  *         that contains the configuration information for the specified TIM 
  *         peripheral.
  * @retval None
  */
void TIM_ICInit(TIM_TypeDef* TIMx, TIM_ICInitTypeDef* TIM_ICInitStruct)
{
  /* Check the parameters */
  assert_param(IS_TIM_LIST1_PERIPH(TIMx));
  assert_param(IS_TIM_IC_POLARITY(TIM_ICInitStruct->TIM_ICPolarity));
  assert_param(IS_TIM_IC_SELECTION(TIM_ICInitStruct->TIM_ICSelection));
  assert_param(IS_TIM_IC_PRESCALER(TIM_ICInitStruct->TIM_ICPrescaler));
  assert_param(IS_TIM_IC_FILTER(TIM_ICInitStruct->TIM_ICFilter));
  
  if (TIM_ICInitStruct->TIM_Channel == TIM_Channel_1)
  {
    /* TI1 Configuration */
    TI1_Config(TIMx, TIM_ICInitStruct->TIM_ICPolarity,
               TIM_ICInitStruct->TIM_ICSelection,
               TIM_ICInitStruct->TIM_ICFilter);
    /* Set the Input Capture Prescaler value */
    TIM_SetIC1Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
  }
  else if (TIM_ICInitStruct->TIM_Channel == TIM_Channel_2)
  {
    /* TI2 Configuration */
    assert_param(IS_TIM_LIST2_PERIPH(TIMx));
    TI2_Config(TIMx, TIM_ICInitStruct->TIM_ICPolarity,
               TIM_ICInitStruct->TIM_ICSelection,
               TIM_ICInitStruct->TIM_ICFilter);
    /* Set the Input Capture Prescaler value */
    TIM_SetIC2Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
  }
  else if (TIM_ICInitStruct->TIM_Channel == TIM_Channel_3)
  {
    /* TI3 Configuration */
    assert_param(IS_TIM_LIST3_PERIPH(TIMx));
    TI3_Config(TIMx,  TIM_ICInitStruct->TIM_ICPolarity,
               TIM_ICInitStruct->TIM_ICSelection,
               TIM_ICInitStruct->TIM_ICFilter);
    /* Set the Input Capture Prescaler value */
    TIM_SetIC3Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
  }
  else
  {
    /* TI4 Configuration */
    assert_param(IS_TIM_LIST3_PERIPH(TIMx));
    TI4_Config(TIMx, TIM_ICInitStruct->TIM_ICPolarity,
               TIM_ICInitStruct->TIM_ICSelection,
               TIM_ICInitStruct->TIM_ICFilter);
    /* Set the Input Capture Prescaler value */
    TIM_SetIC4Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
  }
}

/**
  * @brief  Fills each TIM_ICInitStruct member with its default value.
  * @param  TIM_ICInitStruct : pointer to a TIM_ICInitTypeDef structure which will
  *         be initialized.
  * @retval None
  */
void TIM_ICStructInit(TIM_ICInitTypeDef* TIM_ICInitStruct)
{
  /* Set the default configuration */
  TIM_ICInitStruct->TIM_Channel = TIM_Channel_1;
  TIM_ICInitStruct->TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStruct->TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStruct->TIM_ICPrescaler = TIM_ICPSC_DIV1;
  TIM_ICInitStruct->TIM_ICFilter = 0x00;
}

/**
  * @brief  Configures the TIM peripheral according to the specified
  *         parameters in the TIM_ICInitStruct to measure an external PWM signal.
  * @param  TIMx: where x can be 2, 3, 4, 5 or 9 to select the TIM peripheral.
  * @param  TIM_ICInitStruct: pointer to a TIM_ICInitTypeDef structure
  *         that contains the configuration information for the specified TIM 
  *         peripheral.
  * @retval None
  */
void TIM_PWMIConfig(TIM_TypeDef* TIMx, TIM_ICInitTypeDef* TIM_ICInitStruct)
{
  uint16_t icoppositepolarity = TIM_ICPolarity_Rising;
  uint16_t icoppositeselection = TIM_ICSelection_DirectTI;
  /* Check the parameters */
  assert_param(IS_TIM_LIST2_PERIPH(TIMx));
  /* Select the Opposite Input Polarity */
  if (TIM_ICInitStruct->TIM_ICPolarity == TIM_ICPolarity_Rising)
  {
    icoppositepolarity = TIM_ICPolarity_Falling;
  }
  else
  {
    icoppositepolarity = TIM_ICPolarity_Rising;
  }
  /* Select the Opposite Input */
  if (TIM_ICInitStruct->TIM_ICSelection == TIM_ICSelection_DirectTI)
  {
    icoppositeselection = TIM_ICSelection_IndirectTI;
  }
  else
  {
    icoppositeselection = TIM_ICSelection_DirectTI;
  }
  if (TIM_ICInitStruct->TIM_Channel == TIM_Channel_1)
  {
    /* TI1 Configuration */
    TI1_Config(TIMx, TIM_ICInitStruct->TIM_ICPolarity, TIM_ICInitStruct->TIM_ICSelection,
               TIM_ICInitStruct->TIM_ICFilter);
    /* Set the Input Capture Prescaler value */
    TIM_SetIC1Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
    /* TI2 Configuration */
    TI2_Config(TIMx, icoppositepolarity, icoppositeselection, TIM_ICInitStruct->TIM_ICFilter);
    /* Set the Input Capture Prescaler value */
    TIM_SetIC2Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
  }
  else
  { 
    /* TI2 Configuration */
    TI2_Config(TIMx, TIM_ICInitStruct->TIM_ICPolarity, TIM_ICInitStruct->TIM_ICSelection,
               TIM_ICInitStruct->TIM_ICFilter);
    /* Set the Input Capture Prescaler value */
    TIM_SetIC2Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
    /* TI1 Configuration */
    TI1_Config(TIMx, icoppositepolarity, icoppositeselection, TIM_ICInitStruct->TIM_ICFilter);
    /* Set the Input Capture Prescaler value */
    TIM_SetIC1Prescaler(TIMx, TIM_ICInitStruct->TIM_ICPrescaler);
  }
}

/**
  * @brief  Gets the TIMx Input Capture 1 value.
  * @param  TIMx: where x can be 2, 3, 4, 5, 9, 10 or 11 to select the TIM peripheral.
  * @retval Capture Compare 1 Register value.
  */
uint32_t TIM_GetCapture1(TIM_TypeDef* TIMx)
{
  /* Check the parameters */
  assert_param(IS_TIM_LIST1_PERIPH(TIMx));
  
  /* Get the Capture 1 Register value */
  return TIMx->CCR1;
}

/**
  * @brief  Gets the TIMx Input Capture 2 value.
  * @param  TIMx: where x can be 2, 3, 4, 5 or 9 to select the TIM peripheral.
  * @retval Capture Compare 2 Register value.
  */
uint32_t TIM_GetCapture2(TIM_TypeDef* TIMx)
{
  /* Check the parameters */
  assert_param(IS_TIM_LIST2_PERIPH(TIMx));
  
  /* Get the Capture 2 Register value */
  return TIMx->CCR2;
}

/**
  * @brief  Gets the TIMx Input Capture 3 value.
  * @param  TIMx: where x can be 2, 3, 4 or 5 to select the TIM peripheral.
  * @retval Capture Compare 3 Register value.
  */
uint32_t TIM_GetCapture3(TIM_TypeDef* TIMx)
{
  /* Check the parameters */
  assert_param(IS_TIM_LIST3_PERIPH(TIMx)); 
  
  /* Get the Capture 3 Register value */
  return TIMx->CCR3;
}

/**
  * @brief  Gets the TIMx Input Capture 4 value.
  * @param  TIMx: where x can be 2, 3, 4 or 5 to select the TIM peripheral.
  * @retval Capture Compare 4 Register value.
  */
uint32_t TIM_GetCapture4(TIM_TypeDef* TIMx)
{
  /* Check the parameters */
  assert_param(IS_TIM_LIST3_PERIPH(TIMx));
  
  /* Get the Capture 4 Register value */
  return TIMx->CCR4;
}

/**
  * @brief  Sets the TIMx Input Capture 1 prescaler.
  * @param  TIMx: where x can be 2, 3, 4, 5, 9, 10 or 11 to select the TIM peripheral.
  * @param  TIM_ICPSC: specifies the Input Capture1 prescaler new value.
  *   This parameter can be one of the following values:
  *     @arg TIM_ICPSC_DIV1: no prescaler.
  *     @arg TIM_ICPSC_DIV2: capture is done once every 2 events.
  *     @arg TIM_ICPSC_DIV4: capture is done once every 4 events.
  *