rt-thread/bsp/stm32f0x/Libraries/STM32F0xx_StdPeriph_Driver/src/stm32f0xx_dma.c

/**
  ******************************************************************************
  * @file    stm32f0xx_dma.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    23-March-2012
  * @brief   This file provides firmware functions to manage the following 
  *          functionalities of the Direct Memory Access controller (DMA):
  *           + Initialization and Configuration
  *           + Data Counter
  *           + Interrupts and flags management
  *
  *  @verbatim
  ==============================================================================
                      ##### How to use this driver #####
  ==============================================================================
    [..]
    (#) Enable The DMA controller clock using 
        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE) function for DMA1.
    (#) Enable and configure the peripheral to be connected to the DMA channel
       (except for internal SRAM / FLASH memories: no initialization is necessary).
    (#) For a given Channel, program the Source and Destination addresses, 
        the transfer Direction, the Buffer Size, the Peripheral and Memory 
        Incrementation mode and Data Size, the Circular or Normal mode, 
        the channel transfer Priority and the Memory-to-Memory transfer 
        mode (if needed) using the DMA_Init() function.
    (#) Enable the NVIC and the corresponding interrupt(s) using the function 
        DMA_ITConfig() if you need to use DMA interrupts.
    (#) Enable the DMA channel using the DMA_Cmd() function.
    (#) Activate the needed channel Request using PPP_DMACmd() function for 
        any PPP peripheral except internal SRAM and FLASH (ie. SPI, USART ...) 
        The function allowing this operation is provided in each PPP peripheral 
        driver (ie. SPI_DMACmd for SPI peripheral).
    (#) Optionally, you can configure the number of data to be transferred
        when the channel is disabled (ie. after each Transfer Complete event
        or when a Transfer Error occurs) using the function DMA_SetCurrDataCounter().
        And you can get the number of remaining data to be transferred using 
        the function DMA_GetCurrDataCounter() at run time (when the DMA channel is
        enabled and running).
    (#) To control DMA events you can use one of the following two methods:
        (##) Check on DMA channel flags using the function DMA_GetFlagStatus().
        (##) Use DMA interrupts through the function DMA_ITConfig() at initialization
             phase and DMA_GetITStatus() function into interrupt routines in
             communication phase.
             After checking on a flag you should clear it using DMA_ClearFlag()
             function. And after checking on an interrupt event you should 
             clear it using DMA_ClearITPendingBit() function.
    @endverbatim
  *
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f0xx_dma.h"

/** @addtogroup STM32F0xx_StdPeriph_Driver
  * @{
  */

/** @defgroup DMA 
  * @brief DMA driver modules
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define CCR_CLEAR_MASK   ((uint32_t)0xFFFF800F) /* DMA Channel config registers Masks */

/* DMA1 Channelx interrupt pending bit masks */
#define DMA1_CHANNEL1_IT_MASK    ((uint32_t)(DMA_ISR_GIF1 | DMA_ISR_TCIF1 | DMA_ISR_HTIF1 | DMA_ISR_TEIF1))
#define DMA1_CHANNEL2_IT_MASK    ((uint32_t)(DMA_ISR_GIF2 | DMA_ISR_TCIF2 | DMA_ISR_HTIF2 | DMA_ISR_TEIF2))
#define DMA1_CHANNEL3_IT_MASK    ((uint32_t)(DMA_ISR_GIF3 | DMA_ISR_TCIF3 | DMA_ISR_HTIF3 | DMA_ISR_TEIF3))
#define DMA1_CHANNEL4_IT_MASK    ((uint32_t)(DMA_ISR_GIF4 | DMA_ISR_TCIF4 | DMA_ISR_HTIF4 | DMA_ISR_TEIF4))
#define DMA1_CHANNEL5_IT_MASK    ((uint32_t)(DMA_ISR_GIF5 | DMA_ISR_TCIF5 | DMA_ISR_HTIF5 | DMA_ISR_TEIF5))

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup DMA_Private_Functions 
  * @{
  */

/** @defgroup DMA_Group1 Initialization and Configuration functions
 *  @brief   Initialization and Configuration functions
 *
@verbatim   
 ===============================================================================
            ##### Initialization and Configuration functions #####
 ===============================================================================
    [..] This subsection provides functions allowing to initialize the DMA channel 
         source and destination addresses, incrementation and data sizes, transfer 
         direction, buffer size, circular/normal mode selection, memory-to-memory 
         mode selection and channel priority value.
    [..] The DMA_Init() function follows the DMA configuration procedures as described 
         in reference manual (RM0091).
@endverbatim
  * @{
  */
    
/**
  * @brief  Deinitializes the DMAy Channelx registers to their default reset
  *         values.
  * @param  DMAy_Channelx: where y can be 1 to select the DMA and 
  *         x can be 1 to 5 for DMA1 to select the DMA Channel.
  * @retval None
  */
void DMA_DeInit(DMA_Channel_TypeDef* DMAy_Channelx)
{
  /* Check the parameters */
  assert_param(IS_DMA_ALL_PERIPH(DMAy_Channelx));

  /* Disable the selected DMAy Channelx */
  DMAy_Channelx->CCR &= (uint16_t)(~DMA_CCR_EN);

  /* Reset DMAy Channelx control register */
  DMAy_Channelx->CCR  = 0;

  /* Reset DMAy Channelx remaining bytes register */
  DMAy_Channelx->CNDTR = 0;

  /* Reset DMAy Channelx peripheral address register */
  DMAy_Channelx->CPAR  = 0;

  /* Reset DMAy Channelx memory address register */
  DMAy_Channelx->CMAR = 0;

  if (DMAy_Channelx == DMA1_Channel1)
  {
    /* Reset interrupt pending bits for DMA1 Channel1 */
    DMA1->IFCR |= DMA1_CHANNEL1_IT_MASK;
  }
  else if (DMAy_Channelx == DMA1_Channel2)
  {
    /* Reset interrupt pending bits for DMA1 Channel2 */
    DMA1->IFCR |= DMA1_CHANNEL2_IT_MASK;
  }
  else if (DMAy_Channelx == DMA1_Channel3)
  {
    /* Reset interrupt pending bits for DMA1 Channel3 */
    DMA1->IFCR |= DMA1_CHANNEL3_IT_MASK;
  }
  else if (DMAy_Channelx == DMA1_Channel4)
  {
    /* Reset interrupt pending bits for DMA1 Channel4 */
    DMA1->IFCR |= DMA1_CHANNEL4_IT_MASK;
  }
  else
  {
    if (DMAy_Channelx == DMA1_Channel5) 
    {
      /* Reset interrupt pending bits for DMA1 Channel5 */
      DMA1->IFCR |= DMA1_CHANNEL5_IT_MASK;
    }
  }
}

/**
  * @brief  Initializes the DMAy Channelx according to the specified parameters 
  *         in the DMA_InitStruct.
  * @param  DMAy_Channelx: where y can be 1 to select the DMA and x can be 1 to 5
  *         for DMA1 to select the DMA Channel.
  * @param  DMA_InitStruct: pointer to a DMA_InitTypeDef structure that contains
  *         the configuration information for the specified DMA Channel.
  * @retval None
  */
void DMA_Init(DMA_Channel_TypeDef* DMAy_Channelx, DMA_InitTypeDef* DMA_InitStruct)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_DMA_ALL_PERIPH(DMAy_Channelx));
  assert_param(IS_DMA_DIR(DMA_InitStruct->DMA_DIR));
  assert_param(IS_DMA_BUFFER_SIZE(DMA_InitStruct->DMA_BufferSize));
  assert_param(IS_DMA_PERIPHERAL_INC_STATE(DMA_InitStruct->DMA_PeripheralInc));
  assert_param(IS_DMA_MEMORY_INC_STATE(DMA_InitStruct->DMA_MemoryInc));
  assert_param(IS_DMA_PERIPHERAL_DATA_SIZE(DMA_InitStruct->DMA_PeripheralDataSize));
  assert_param(IS_DMA_MEMORY_DATA_SIZE(DMA_InitStruct->DMA_MemoryDataSize));
  assert_param(IS_DMA_MODE(DMA_InitStruct->DMA_Mode));
  assert_param(IS_DMA_PRIORITY(DMA_InitStruct->DMA_Priority));
  assert_param(IS_DMA_M2M_STATE(DMA_InitStruct->DMA_M2M));

/*--------------------------- DMAy Channelx CCR Configuration ----------------*/
  /* Get the DMAy_Channelx CCR value */
  tmpreg = DMAy_Channelx->CCR;

  /* Clear MEM2MEM, PL, MSIZE, PSIZE, MINC, PINC, CIRC and DIR bits */
  tmpreg &= CCR_CLEAR_MASK;

  /* Configure DMAy Channelx: data transfer, data size, priority level and mode */
  /* Set DIR bit according to DMA_DIR value */
  /* Set CIRC bit according to DMA_Mode value */
  /* Set PINC bit according to DMA_PeripheralInc value */
  /* Set MINC bit according to DMA_MemoryInc value */
  /* Set PSIZE bits according to DMA_PeripheralDataSize value */
  /* Set MSIZE bits according to DMA_MemoryDataSize value */
  /* Set PL bits according to DMA_Priority value */
  /* Set the MEM2MEM bit according to DMA_M2M value */
  tmpreg |= DMA_InitStruct->DMA_DIR | DMA_InitStruct->DMA_Mode |
            DMA_InitStruct->DMA_PeripheralInc | DMA_InitStruct->DMA_MemoryInc |
            DMA_InitStruct->DMA_PeripheralDataSize | DMA_InitStruct->DMA_MemoryDataSize |
            DMA_InitStruct->DMA_Priority | DMA_InitStruct->DMA_M2M;

  /* Write to DMAy Channelx CCR */
  DMAy_Channelx->CCR = tmpreg;

/*--------------------------- DMAy Channelx CNDTR Configuration --------------*/
  /* Write to DMAy Channelx CNDTR */
  DMAy_Channelx->CNDTR = DMA_InitStruct->DMA_BufferSize;

/*--------------------------- DMAy Channelx CPAR Configuration ---------------*/
  /* Write to DMAy Channelx CPAR */
  DMAy_Channelx->CPAR = DMA_InitStruct->DMA_PeripheralBaseAddr;

/*--------------------------- DMAy Channelx CMAR Configuration ---------------*/
  /* Write to DMAy Channelx CMAR */
  DMAy_Channelx->CMAR = DMA_InitStruct->DMA_MemoryBaseAddr;
}

/**
  * @brief  Fills each DMA_InitStruct member with its default value.
  * @param  DMA_InitStruct: pointer to a DMA_InitTypeDef structure which will
  *         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 to select the DMA and
  *         x can be 1 to 5 for DMA1 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_CCR_EN;
  }
  else
  {
    /* Disable the selected DMAy Channelx */
    DMAy_Channelx->CCR &= (uint16_t)(~DMA_CCR_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 to select the DMA and x can be 
  *         1 to 5 for DMA1 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 to select the DMA and
  *         x can be 1 to 5 for DMA1 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 to select the DMA and
  *         x can be 1 to 5 for DMA1 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  DMA_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.
  *     
  * @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 DMA_FLAG (SET or RESET).
  */
FlagStatus DMA_GetFlagStatus(uint32_t DMA_FLAG)
{
  FlagStatus bitstatus = RESET;

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

  /* Check the status of the specified DMA flag */
  if ((DMA1->ISR & DMA_FLAG) != (uint32_t)RESET)
  {
    /* DMA_FLAG is set */
    bitstatus = SET;
  }
  else
  {
    /* DMA_FLAG is reset */
    bitstatus = RESET;
  }

  /* Return the DMA_FLAG status */
  return  bitstatus;
}

/**
  * @brief  Clears the DMAy Channelx's pending flags.
  * @param  DMA_FLAG: specifies the flag to clear.
  *   This parameter can be any combination (for the same DMA) 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.
  *
  * @note
  *    Clearing the Global flag (DMAy_FLAG_GLx) results in clearing all other flags
  *    relative to the same channel (Transfer Complete, Half-transfer Complete and
  *    Transfer Error flags: DMAy_FLAG_TCx, DMAy_FLAG_HTx and DMAy_FLAG_TEx).
  *
  * @retval None
  */
void DMA_ClearFlag(uint32_t DMA_FLAG)
{
  /* Check the parameters */
  assert_param(IS_DMA_CLEAR_FLAG(DMA_FLAG));

  /* Clear the selected DMA flags */
  DMA1->IFCR = DMA_FLAG;
}

/**
  * @brief  Checks whether the specified DMAy Channelx interrupt has occurred or not.
  * @param  DMA_IT: specifies the DMA interrupt source to check. 
  *   This parameter can be one of the following values:
  *     @arg DMA1_IT_GL1: DMA1 Channel1 global interrupt.
  *     @arg DMA1_IT_TC1: DMA1 Channel1 transfer complete interrupt.
  *     @arg DMA1_IT_HT1: DMA1 Channel1 half transfer interrupt.
  *     @arg DMA1_IT_TE1: DMA1 Channel1 transfer error interrupt.
  *     @arg DMA1_IT_GL2: DMA1 Channel2 global interrupt.
  *     @arg DMA1_IT_TC2: DMA1 Channel2 transfer complete interrupt.
  *     @arg DMA1_IT_HT2: DMA1 Channel2 half transfer interrupt.
  *     @arg DMA1_IT_TE2: DMA1 Channel2 transfer error interrupt.
  *     @arg DMA1_IT_GL3: DMA1 Channel3 global interrupt.
  *     @arg DMA1_IT_TC3: DMA1 Channel3 transfer complete interrupt.
  *     @arg DMA1_IT_HT3: DMA1 Channel3 half transfer interrupt.
  *     @arg DMA1_IT_TE3: DMA1 Channel3 transfer error interrupt.
  *     @arg DMA1_IT_GL4: DMA1 Channel4 global interrupt.
  *     @arg DMA1_IT_TC4: DMA1 Channel4 transfer complete interrupt.
  *     @arg DMA1_IT_HT4: DMA1 Channel4 half transfer interrupt.
  *     @arg DMA1_IT_TE4: DMA1 Channel4 transfer error interrupt.
  *     @arg DMA1_IT_GL5: DMA1 Channel5 global interrupt.
  *     @arg DMA1_IT_TC5: DMA1 Channel5 transfer complete interrupt.
  *     @arg DMA1_IT_HT5: DMA1 Channel5 half transfer interrupt.
  *     @arg DMA1_IT_TE5: DMA1 Channel5 transfer error interrupt.
  *     
  * @note
  *    The Global interrupt (DMAy_FLAG_GLx) is set whenever any of the other 
  *    interrupts relative to the same channel is set (Transfer Complete, 
  *    Half-transfer Complete or Transfer Error interrupts: DMAy_IT_TCx, 
  *    DMAy_IT_HTx or DMAy_IT_TEx). 
  *      
  * @retval The new state of DMA_IT (SET or RESET).
  */
ITStatus DMA_GetITStatus(uint32_t DMA_IT)
{
  ITStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_DMA_GET_IT(DMA_IT));

  /* Check the status of the specified DMA interrupt */
  if ((DMA1->ISR & DMA_IT) != (uint32_t)RESET)
  {
    /* DMA_IT is set */
    bitstatus = SET;
  }
  else
  {
    /* DMA_IT is reset */
    bitstatus = RESET;
  }
  /* Return the DMA_IT status */
  return  bitstatus;
}

/**
  * @brief  Clears the DMAy Channelx's interrupt pending bits.
  * @param  DMA_IT: specifies the DMA interrupt pending bit to clear.
  *   This parameter can be any combination (for the same DMA) of the following values:
  *     @arg DMA1_IT_GL1: DMA1 Channel1 global interrupt.
  *     @arg DMA1_IT_TC1: DMA1 Channel1 transfer complete interrupt.
  *     @arg DMA1_IT_HT1: DMA1 Channel1 half transfer interrupt.
  *     @arg DMA1_IT_TE1: DMA1 Channel1 transfer error interrupt.
  *     @arg DMA1_IT_GL2: DMA1 Channel2 global interrupt.
  *     @arg DMA1_IT_TC2: DMA1 Channel2 transfer complete interrupt.
  *     @arg DMA1_IT_HT2: DMA1 Channel2 half transfer interrupt.
  *     @arg DMA1_IT_TE2: DMA1 Channel2 transfer error interrupt.
  *     @arg DMA1_IT_GL3: DMA1 Channel3 global interrupt.
  *     @arg DMA1_IT_TC3: DMA1 Channel3 transfer complete interrupt.
  *     @arg DMA1_IT_HT3: DMA1 Channel3 half transfer interrupt.
  *     @arg DMA1_IT_TE3: DMA1 Channel3 transfer error interrupt.
  *     @arg DMA1_IT_GL4: DMA1 Channel4 global interrupt.
  *     @arg DMA1_IT_TC4: DMA1 Channel4 transfer complete interrupt.
  *     @arg DMA1_IT_HT4: DMA1 Channel4 half transfer interrupt.
  *     @arg DMA1_IT_TE4: DMA1 Channel4 transfer error interrupt.
  *     @arg DMA1_IT_GL5: DMA1 Channel5 global interrupt.
  *     @arg DMA1_IT_TC5: DMA1 Channel5 transfer complete interrupt.
  *     @arg DMA1_IT_HT5: DMA1 Channel5 half transfer interrupt.
  *     @arg DMA1_IT_TE5: DMA1 Channel5 transfer error interrupt.
  *     
  * @note
  *    Clearing the Global interrupt (DMAy_IT_GLx) results in clearing all other 
  *    interrupts relative to the same channel (Transfer Complete, Half-transfer 
  *    Complete and Transfer Error interrupts: DMAy_IT_TCx, DMAy_IT_HTx and 
  *    DMAy_IT_TEx).  
  *        
  * @retval None
  */
void DMA_ClearITPendingBit(uint32_t DMA_IT)
{
  /* Check the parameters */
  assert_param(IS_DMA_CLEAR_IT(DMA_IT));

  /* Clear the selected DMA interrupt pending bits */
  DMA1->IFCR = DMA_IT;
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/