stm32l1xx_dma.c

VS1003_MP3_SPI_SDHC_FAT32

  *         be initialized.
  * @retval None
  */
void DMA_StructInit(DMA_InitTypeDef* DMA_InitStruct)
{
/*-------------- Reset DMA init structure parameters values ------------------*/
  /* Initialize the DMA_PeripheralBaseAddr member */
  DMA_InitStruct->DMA_PeripheralBaseAddr = 0;
  /* Initialize the DMA_MemoryBaseAddr member */
  DMA_InitStruct->DMA_MemoryBaseAddr = 0;
  /* Initialize the DMA_DIR member */
  DMA_InitStruct->DMA_DIR = DMA_DIR_PeripheralSRC;
  /* Initialize the DMA_BufferSize member */
  DMA_InitStruct->DMA_BufferSize = 0;
  /* Initialize the DMA_PeripheralInc member */
  DMA_InitStruct->DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  /* Initialize the DMA_MemoryInc member */
  DMA_InitStruct->DMA_MemoryInc = DMA_MemoryInc_Disable;
  /* Initialize the DMA_PeripheralDataSize member */
  DMA_InitStruct->DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  /* Initialize the DMA_MemoryDataSize member */
  DMA_InitStruct->DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  /* Initialize the DMA_Mode member */
  DMA_InitStruct->DMA_Mode = DMA_Mode_Normal;
  /* Initialize the DMA_Priority member */
  DMA_InitStruct->DMA_Priority = DMA_Priority_Low;
  /* Initialize the DMA_M2M member */
  DMA_InitStruct->DMA_M2M = DMA_M2M_Disable;
}

/**
  * @brief  Enables or disables the specified DMAy Channelx.
  * @param  DMAy_Channelx: where y can be 1 or 2 to select the DMA and x can be 
  *         1 to 7 for DMA1 and 1 to 5 for DMA2 to select the DMA Channel.
  * @param  NewState: new state of the DMAy Channelx. 
  *         This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void DMA_Cmd(DMA_Channel_TypeDef* DMAy_Channelx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_DMA_ALL_PERIPH(DMAy_Channelx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected DMAy Channelx */
    DMAy_Channelx->CCR |= DMA_CCR1_EN;
  }
  else
  {
    /* Disable the selected DMAy Channelx */
    DMAy_Channelx->CCR &= (uint16_t)(~DMA_CCR1_EN);
  }
}

/**
  * @}
  */

/** @defgroup DMA_Group2 Data Counter functions
 *  @brief   Data Counter functions 
 *
@verbatim   
 ===============================================================================
                      ##### Data Counter functions #####
 ===============================================================================
    [..] This subsection provides function allowing to configure and read the buffer 
         size (number of data to be transferred).The DMA data counter can be written 
         only when the DMA channel is disabled (ie. after transfer complete event).
    [..] The following function can be used to write the Channel data counter value:
         (+) void DMA_SetCurrDataCounter(DMA_Channel_TypeDef* DMAy_Channelx, uint16_t 
             DataNumber).
    -@- It is advised to use this function rather than DMA_Init() in situations 
        where only the Data buffer needs to be reloaded.
    [..] The DMA data counter can be read to indicate the number of remaining transfers 
         for the relative DMA channel. This counter is decremented at the end of each 
         data transfer and when the transfer is complete: 
         (+) If Normal mode is selected: the counter is set to 0.
         (+) If Circular mode is selected: the counter is reloaded with the initial 
         value(configured before enabling the DMA channel).
    [..] The following function can be used to read the Channel data counter value:
         (+) uint16_t DMA_GetCurrDataCounter(DMA_Channel_TypeDef* DMAy_Channelx).

@endverbatim
  * @{
  */

/**
  * @brief  Sets the number of data units in the current DMAy Channelx transfer.
  * @param  DMAy_Channelx: where y can be 1 or 2 to select the DMA and x can be 
  *         1 to 7 for DMA1 and 1 to 5 for DMA2 to select the DMA Channel.
  * @param  DataNumber: The number of data units in the current DMAy Channelx
  *         transfer.
  * @note   This function can only be used when the DMAy_Channelx is disabled.
  * @retval None.
  */
void DMA_SetCurrDataCounter(DMA_Channel_TypeDef* DMAy_Channelx, uint16_t DataNumber)
{
  /* Check the parameters */
  assert_param(IS_DMA_ALL_PERIPH(DMAy_Channelx));
  
/*--------------------------- DMAy Channelx CNDTR Configuration ---------------*/
  /* Write to DMAy Channelx CNDTR */
  DMAy_Channelx->CNDTR = DataNumber;  
}

/**
  * @brief  Returns the number of remaining data units in the current
  *         DMAy Channelx transfer.
  * @param  DMAy_Channelx: where y can be 1 or 2 to select the DMA and x can be 
  *         1 to 7 for DMA1 and 1 to 5 for DMA2 to select the DMA Channel.
  * @retval The number of remaining data units in the current DMAy Channelx
  *         transfer.
  */
uint16_t DMA_GetCurrDataCounter(DMA_Channel_TypeDef* DMAy_Channelx)
{
  /* Check the parameters */
  assert_param(IS_DMA_ALL_PERIPH(DMAy_Channelx));
  /* Return the number of remaining data units for DMAy Channelx */
  return ((uint16_t)(DMAy_Channelx->CNDTR));
}

/**
  * @}
  */

/** @defgroup DMA_Group3 Interrupts and flags management functions
 *  @brief   Interrupts and flags management functions 
 *
@verbatim   
 ===============================================================================
          ##### Interrupts and flags management functions #####
 ===============================================================================
    [..] This subsection provides functions allowing to configure the DMA Interrupts 
         sources and check or clear the flags or pending bits status.
         The user should identify which mode will be used in his application to manage 
         the DMA controller events: Polling mode or Interrupt mode. 
  *** Polling Mode ***
  ====================
    [..] Each DMA channel can be managed through 4 event Flags:(y : DMA Controller 
         number  x : DMA channel number ).
         (#) DMAy_FLAG_TCx : to indicate that a Transfer Complete event occurred.
         (#) DMAy_FLAG_HTx : to indicate that a Half-Transfer Complete event occurred.
         (#) DMAy_FLAG_TEx : to indicate that a Transfer Error occurred.
         (#) DMAy_FLAG_GLx : to indicate that at least one of the events described 
             above occurred.
    -@- Clearing DMAy_FLAG_GLx results in clearing all other pending flags of the 
        same channel (DMAy_FLAG_TCx, DMAy_FLAG_HTx and DMAy_FLAG_TEx).
    [..]In this Mode it is advised to use the following functions:
        (+) FlagStatus DMA_GetFlagStatus(uint32_t DMA_FLAG);
        (+) void DMA_ClearFlag(uint32_t DMA_FLAG);

  *** Interrupt Mode ***
  ======================
    [..] Each DMA channel can be managed through 4 Interrupts:
    (+) Interrupt Source
       (##) DMA_IT_TC: specifies the interrupt source for the Transfer Complete 
            event.
       (##) DMA_IT_HT : specifies the interrupt source for the Half-transfer Complete 
            event.
       (##) DMA_IT_TE : specifies the interrupt source for the transfer errors event.
       (##) DMA_IT_GL : to indicate that at least one of the interrupts described 
            above occurred.
    -@@- Clearing DMA_IT_GL interrupt results in clearing all other interrupts of 
        the same channel (DMA_IT_TCx, DMA_IT_HT and DMA_IT_TE).
    [..]In this Mode it is advised to use the following functions:
        (+) void DMA_ITConfig(DMA_Channel_TypeDef* DMAy_Channelx, uint32_t DMA_IT, 
            FunctionalState NewState);
        (+) ITStatus DMA_GetITStatus(uint32_t DMA_IT);
        (+) void DMA_ClearITPendingBit(uint32_t DMA_IT);

@endverbatim
  * @{
  */

/**
  * @brief  Enables or disables the specified DMAy Channelx interrupts.
  * @param  DMAy_Channelx: where y can be 1 or 2 to select the DMA and x can be 
  *         1 to 7 for DMA1 and 1 to 5 for DMA2 to select the DMA Channel.
  * @param  DMA_IT: specifies the DMA interrupts sources to be enabled
  *         or disabled. 
  *   This parameter can be any combination of the following values:
  *     @arg DMA_IT_TC: Transfer complete interrupt mask
  *     @arg DMA_IT_HT: Half transfer interrupt mask
  *     @arg DMA_IT_TE: Transfer error interrupt mask
  * @param  NewState: new state of the specified DMA interrupts.
  *         This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void DMA_ITConfig(DMA_Channel_TypeDef* DMAy_Channelx, uint32_t DMA_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_DMA_ALL_PERIPH(DMAy_Channelx));
  assert_param(IS_DMA_CONFIG_IT(DMA_IT));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected DMA interrupts */
    DMAy_Channelx->CCR |= DMA_IT;
  }
  else
  {
    /* Disable the selected DMA interrupts */
    DMAy_Channelx->CCR &= ~DMA_IT;
  }
}

/**
  * @brief  Checks whether the specified DMAy Channelx flag is set or not.
  * @param  DMAy_FLAG: specifies the flag to check.
  *   This parameter can be one of the following values:
  *     @arg DMA1_FLAG_GL1: DMA1 Channel1 global flag.
  *     @arg DMA1_FLAG_TC1: DMA1 Channel1 transfer complete flag.
  *     @arg DMA1_FLAG_HT1: DMA1 Channel1 half transfer flag.
  *     @arg DMA1_FLAG_TE1: DMA1 Channel1 transfer error flag.
  *     @arg DMA1_FLAG_GL2: DMA1 Channel2 global flag.
  *     @arg DMA1_FLAG_TC2: DMA1 Channel2 transfer complete flag.
  *     @arg DMA1_FLAG_HT2: DMA1 Channel2 half transfer flag.
  *     @arg DMA1_FLAG_TE2: DMA1 Channel2 transfer error flag.
  *     @arg DMA1_FLAG_GL3: DMA1 Channel3 global flag.
  *     @arg DMA1_FLAG_TC3: DMA1 Channel3 transfer complete flag.
  *     @arg DMA1_FLAG_HT3: DMA1 Channel3 half transfer flag.
  *     @arg DMA1_FLAG_TE3: DMA1 Channel3 transfer error flag.
  *     @arg DMA1_FLAG_GL4: DMA1 Channel4 global flag.
  *     @arg DMA1_FLAG_TC4: DMA1 Channel4 transfer complete flag.
  *     @arg DMA1_FLAG_HT4: DMA1 Channel4 half transfer flag.
  *     @arg DMA1_FLAG_TE4: DMA1 Channel4 transfer error flag.
  *     @arg DMA1_FLAG_GL5: DMA1 Channel5 global flag.
  *     @arg DMA1_FLAG_TC5: DMA1 Channel5 transfer complete flag.
  *     @arg DMA1_FLAG_HT5: DMA1 Channel5 half transfer flag.
  *     @arg DMA1_FLAG_TE5: DMA1 Channel5 transfer error flag.
  *     @arg DMA1_FLAG_GL6: DMA1 Channel6 global flag.
  *     @arg DMA1_FLAG_TC6: DMA1 Channel6 transfer complete flag.
  *     @arg DMA1_FLAG_HT6: DMA1 Channel6 half transfer flag.
  *     @arg DMA1_FLAG_TE6: DMA1 Channel6 transfer error flag.
  *     @arg DMA1_FLAG_GL7: DMA1 Channel7 global flag.
  *     @arg DMA1_FLAG_TC7: DMA1 Channel7 transfer complete flag.
  *     @arg DMA1_FLAG_HT7: DMA1 Channel7 half transfer flag.
  *     @arg DMA1_FLAG_TE7: DMA1 Channel7 transfer error flag.
  *     @arg DMA2_FLAG_GL1: DMA2 Channel1 global flag.
  *     @arg DMA2_FLAG_TC1: DMA2 Channel1 transfer complete flag.
  *     @arg DMA2_FLAG_HT1: DMA2 Channel1 half transfer flag.
  *     @arg DMA2_FLAG_TE1: DMA2 Channel1 transfer error flag.
  *     @arg DMA2_FLAG_GL2: DMA2 Channel2 global flag.
  *     @arg DMA2_FLAG_TC2: DMA2 Channel2 transfer complete flag.
  *     @arg DMA2_FLAG_HT2: DMA2 Channel2 half transfer flag.
  *     @arg DMA2_FLAG_TE2: DMA2 Channel2 transfer error flag.
  *     @arg DMA2_FLAG_GL3: DMA2 Channel3 global flag.
  *     @arg DMA2_FLAG_TC3: DMA2 Channel3 transfer complete flag.
  *     @arg DMA2_FLAG_HT3: DMA2 Channel3 half transfer flag.
  *     @arg DMA2_FLAG_TE3: DMA2 Channel3 transfer error flag.
  *     @arg DMA2_FLAG_GL4: DMA2 Channel4 global flag.
  *     @arg DMA2_FLAG_TC4: DMA2 Channel4 transfer complete flag.
  *     @arg DMA2_FLAG_HT4: DMA2 Channel4 half transfer flag.
  *     @arg DMA2_FLAG_TE4: DMA2 Channel4 transfer error flag.
  *     @arg DMA2_FLAG_GL5: DMA2 Channel5 global flag.
  *     @arg DMA2_FLAG_TC5: DMA2 Channel5 transfer complete flag.
  *     @arg DMA2_FLAG_HT5: DMA2 Channel5 half transfer flag.
  *     @arg DMA2_FLAG_TE5: DMA2 Channel5 transfer error flag.
  *     
  * @note
  *    The Global flag (DMAy_FLAG_GLx) is set whenever any of the other flags 
  *    relative to the same channel is set (Transfer Complete, Half-transfer 
  *    Complete or Transfer Error flags: DMAy_FLAG_TCx, DMAy_FLAG_HTx or 
  *    DMAy_FLAG_TEx). 
  *      
  * @retval The new state of DMAy_FLAG (SET or RESET).
  */
FlagStatus DMA_GetFlagStatus(uint32_t DMAy_FLAG)
{
  FlagStatus bitstatus = RESET;
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_DMA_GET_FLAG(DMAy_FLAG));

  /* Calculate the used DMAy */
  if ((DMAy_FLAG & FLAG_MASK) == (uint32_t)RESET)
  {
    /* Get DMA1 ISR register value */
    tmpreg = DMA1->ISR;
  }
  else
  {
    /* Get DMA2 ISR register value */
    tmpreg = DMA2->ISR;