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/**

  ******************************************************************************

  * @file    stm32f0xx_hal_usart.c

  * @author  MCD Application Team

  * @brief   USART HAL module driver.

  *          This file provides firmware functions to manage the following

  *          functionalities of the Universal Synchronous/Asynchronous Receiver Transmitter

  *          Peripheral (USART).

  *           + Initialization and de-initialization functions

  *           + IO operation functions

  *           + Peripheral Control functions

  *           + Peripheral State and Error functions

  *

  @verbatim

 ===============================================================================

                        ##### How to use this driver #####

 ===============================================================================

    [..]

      The USART HAL driver can be used as follows:

      (#) Declare a USART_HandleTypeDef handle structure (eg. USART_HandleTypeDef husart).

      (#) Initialize the USART low level resources by implementing the HAL_USART_MspInit() API:

          (++) Enable the USARTx interface clock.

          (++) USART pins configuration:

            (+++) Enable the clock for the USART GPIOs.

            (+++) Configure these USART pins as alternate function pull-up.

          (++) NVIC configuration if you need to use interrupt process (HAL_USART_Transmit_IT(),

                HAL_USART_Receive_IT() and HAL_USART_TransmitReceive_IT() APIs):

            (+++) Configure the USARTx interrupt priority.

            (+++) Enable the NVIC USART IRQ handle.

            (++) USART interrupts handling:

              -@@-   The specific USART interrupts (Transmission complete interrupt,

                  RXNE interrupt and Error Interrupts) will be managed using the macros

                  __HAL_USART_ENABLE_IT() and __HAL_USART_DISABLE_IT() inside the transmit and receive process.

          (++) DMA Configuration if you need to use DMA process (HAL_USART_Transmit_DMA()

               HAL_USART_Receive_DMA() and HAL_USART_TransmitReceive_DMA() APIs):

            (+++) Declare a DMA handle structure for the Tx/Rx channel.

            (+++) Enable the DMAx interface clock.

            (+++) Configure the declared DMA handle structure with the required Tx/Rx parameters.

            (+++) Configure the DMA Tx/Rx channel.

            (+++) Associate the initialized DMA handle to the USART DMA Tx/Rx handle.

            (+++) Configure the priority and enable the NVIC for the transfer

                  complete interrupt on the DMA Tx/Rx channel.

      (#) Program the Baud Rate, Word Length, Stop Bit, Parity, and Mode

          (Receiver/Transmitter) in the husart handle Init structure.

      (#) Initialize the USART registers by calling the HAL_USART_Init() API:

          (++) This API configures also the low level Hardware GPIO, CLOCK, CORTEX...etc)

               by calling the customized HAL_USART_MspInit(&husart) API.

    [..]

     (@) To configure and enable/disable the USART to wake up the MCU from stop mode, resort to UART API's

        HAL_UARTEx_StopModeWakeUpSourceConfig(), HAL_UARTEx_EnableStopMode() and

        HAL_UARTEx_DisableStopMode() in casting the USART handle to UART type UART_HandleTypeDef.

    ##### Callback registration #####

    ==================================

    [..]

    The compilation define USE_HAL_USART_REGISTER_CALLBACKS when set to 1

    allows the user to configure dynamically the driver callbacks.

    [..]

    Use Function HAL_USART_RegisterCallback() to register a user callback.

    Function HAL_USART_RegisterCallback() allows to register following callbacks:

    (+) TxHalfCpltCallback        : Tx Half Complete Callback.

    (+) TxCpltCallback            : Tx Complete Callback.

    (+) RxHalfCpltCallback        : Rx Half Complete Callback.

    (+) RxCpltCallback            : Rx Complete Callback.

    (+) TxRxCpltCallback          : Tx Rx Complete Callback.

    (+) ErrorCallback             : Error Callback.

    (+) AbortCpltCallback         : Abort Complete Callback.

    (+) MspInitCallback           : USART MspInit.

    (+) MspDeInitCallback         : USART MspDeInit.

    This function takes as parameters the HAL peripheral handle, the Callback ID

    and a pointer to the user callback function.

    [..]

    Use function HAL_USART_UnRegisterCallback() to reset a callback to the default

    weak (surcharged) function.

    HAL_USART_UnRegisterCallback() takes as parameters the HAL peripheral handle,

    and the Callback ID.

    This function allows to reset following callbacks:

    (+) TxHalfCpltCallback        : Tx Half Complete Callback.

    (+) TxCpltCallback            : Tx Complete Callback.

    (+) RxHalfCpltCallback        : Rx Half Complete Callback.

    (+) RxCpltCallback            : Rx Complete Callback.

    (+) TxRxCpltCallback          : Tx Rx Complete Callback.

    (+) ErrorCallback             : Error Callback.

    (+) AbortCpltCallback         : Abort Complete Callback.

    (+) MspInitCallback           : USART MspInit.

    (+) MspDeInitCallback         : USART MspDeInit.

    [..]

    By default, after the HAL_USART_Init() and when the state is HAL_USART_STATE_RESET

    all callbacks are set to the corresponding weak (surcharged) functions:

    examples HAL_USART_TxCpltCallback(), HAL_USART_RxHalfCpltCallback().

    Exception done for MspInit and MspDeInit functions that are respectively

    reset to the legacy weak (surcharged) functions in the HAL_USART_Init()

    and HAL_USART_DeInit() only when these callbacks are null (not registered beforehand).

    If not, MspInit or MspDeInit are not null, the HAL_USART_Init() and HAL_USART_DeInit()

    keep and use the user MspInit/MspDeInit callbacks (registered beforehand).

    [..]

    Callbacks can be registered/unregistered in HAL_USART_STATE_READY state only.

    Exception done MspInit/MspDeInit that can be registered/unregistered

    in HAL_USART_STATE_READY or HAL_USART_STATE_RESET state, thus registered (user)

    MspInit/DeInit callbacks can be used during the Init/DeInit.

    In that case first register the MspInit/MspDeInit user callbacks

    using HAL_USART_RegisterCallback() before calling HAL_USART_DeInit()

    or HAL_USART_Init() function.

    [..]

    When The compilation define USE_HAL_USART_REGISTER_CALLBACKS is set to 0 or

    not defined, the callback registration feature is not available

    and weak (surcharged) callbacks are used.

  @endverbatim

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.

  * All rights reserved.</center></h2>

  *

  * This software component is licensed by ST under BSD 3-Clause license,

  * the "License"; You may not use this file except in compliance with the

  * License. You may obtain a copy of the License at:

  *                        opensource.org/licenses/BSD-3-Clause

  *

  ******************************************************************************

  */

/* Includes ------------------------------------------------------------------*/

#include "stm32f0xx_hal.h"

/** @addtogroup STM32F0xx_HAL_Driver

  * @{

  */

/** @defgroup USART USART

  * @brief HAL USART Synchronous module driver

  * @{

  */

#ifdef HAL_USART_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/** @defgroup USART_Private_Constants USART Private Constants

  * @{

  */

#define USART_DUMMY_DATA          ((uint16_t) 0xFFFF)           /*!< USART transmitted dummy data                     */

#define USART_TEACK_REACK_TIMEOUT             1000U             /*!< USART TX or RX enable acknowledge time-out value */

#define USART_CR1_FIELDS          ((uint32_t)(USART_CR1_M | USART_CR1_PCE | USART_CR1_PS | \

                                              USART_CR1_TE | USART_CR1_RE  | USART_CR1_OVER8))    /*!< USART CR1 fields of parameters set by USART_SetConfig API */

#define USART_CR2_FIELDS          ((uint32_t)(USART_CR2_CPHA | USART_CR2_CPOL | \

                                              USART_CR2_CLKEN | USART_CR2_LBCL | USART_CR2_STOP)) /*!< USART CR2 fields of parameters set by USART_SetConfig API */

#define USART_BRR_MIN    0x10U        /* USART BRR minimum authorized value */

#define USART_BRR_MAX    0xFFFFU      /* USART BRR maximum authorized value */

/**

  * @}

  */

/* Private macros ------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

/** @addtogroup USART_Private_Functions

  * @{

  */

#if (USE_HAL_USART_REGISTER_CALLBACKS == 1)

void USART_InitCallbacksToDefault(USART_HandleTypeDef *husart);

#endif /* USE_HAL_USART_REGISTER_CALLBACKS */

static void USART_EndTransfer(USART_HandleTypeDef *husart);

static void USART_DMATransmitCplt(DMA_HandleTypeDef *hdma);

static void USART_DMAReceiveCplt(DMA_HandleTypeDef *hdma);

static void USART_DMATxHalfCplt(DMA_HandleTypeDef *hdma);

static void USART_DMARxHalfCplt(DMA_HandleTypeDef *hdma);

static void USART_DMAError(DMA_HandleTypeDef *hdma);

static void USART_DMAAbortOnError(DMA_HandleTypeDef *hdma);

static void USART_DMATxAbortCallback(DMA_HandleTypeDef *hdma);

static void USART_DMARxAbortCallback(DMA_HandleTypeDef *hdma);

static HAL_StatusTypeDef USART_WaitOnFlagUntilTimeout(USART_HandleTypeDef *husart, uint32_t Flag, FlagStatus Status,

                                                      uint32_t Tickstart, uint32_t Timeout);

static HAL_StatusTypeDef USART_SetConfig(USART_HandleTypeDef *husart);

static HAL_StatusTypeDef USART_CheckIdleState(USART_HandleTypeDef *husart);

static void USART_TxISR_8BIT(USART_HandleTypeDef *husart);

static void USART_TxISR_16BIT(USART_HandleTypeDef *husart);

static void USART_EndTransmit_IT(USART_HandleTypeDef *husart);

static void USART_RxISR_8BIT(USART_HandleTypeDef *husart);

static void USART_RxISR_16BIT(USART_HandleTypeDef *husart);

/**

  * @}

  */

/* Exported functions --------------------------------------------------------*/

/** @defgroup USART_Exported_Functions USART Exported Functions

  * @{

  */

/** @defgroup USART_Exported_Functions_Group1 Initialization and de-initialization functions

  * @brief    Initialization and Configuration functions

  *

@verbatim

 ===============================================================================

            ##### Initialization and Configuration functions #####

 ===============================================================================

    [..]

    This subsection provides a set of functions allowing to initialize the USART

    in asynchronous and in synchronous modes.

      (+) For the asynchronous mode only these parameters can be configured:

        (++) Baud Rate

        (++) Word Length

        (++) Stop Bit

        (++) Parity: If the parity is enabled, then the MSB bit of the data written

             in the data register is transmitted but is changed by the parity bit.

        (++) USART polarity

        (++) USART phase

        (++) USART LastBit

        (++) Receiver/transmitter modes

    [..]

    The HAL_USART_Init() function follows the USART  synchronous configuration

    procedure (details for the procedure are available in reference manual).

@endverbatim

  Depending on the frame length either defined by the M1 and M0 bits (7-bit,

  8-bit or 9-bit) or  by the M bit (8-bits or 9-bits), the possible USART formats

  are listed in the following table.

    Table 1. USART frame format.

    +-----------------------------------------------------------------------+

    |       M bit       |  PCE bit  |             USART frame               |

    |-------------------|-----------|---------------------------------------|

    |         0         |     0     |    | SB |    8-bit data   | STB |     |

    |-------------------|-----------|---------------------------------------|

    |         0         |     1     |    | SB | 7-bit data | PB | STB |     |

    |-------------------|-----------|---------------------------------------|

    |         1         |     0     |    | SB |    9-bit data   | STB |     |

    |-------------------|-----------|---------------------------------------|

    |         1         |     1     |    | SB | 8-bit data | PB | STB |     |

    +-----------------------------------------------------------------------+

    +-----------------------------------------------------------------------+

    |  M1 bit |  M0 bit |  PCE bit  |            USART frame                |

    |---------|---------|-----------|---------------------------------------|

    |    0    |    0    |    0      |    | SB |    8 bit data   | STB |     |

    |---------|---------|-----------|---------------------------------------|

    |    0    |    0    |    1      |    | SB | 7 bit data | PB | STB |     |

    |---------|---------|-----------|---------------------------------------|

    |    0    |    1    |    0      |    | SB |    9 bit data   | STB |     |

    |---------|---------|-----------|---------------------------------------|

    |    0    |    1    |    1      |    | SB | 8 bit data | PB | STB |     |

    |---------|---------|-----------|---------------------------------------|

    |    1    |    0    |    0      |    | SB |    7 bit data   | STB |     |

    |---------|---------|-----------|---------------------------------------|

    |    1    |    0    |    1      |    | SB | 6 bit data | PB | STB |     |

    +-----------------------------------------------------------------------+

  * @{

  */

/**

  * @brief  Initialize the USART mode according to the specified

  *         parameters in the USART_InitTypeDef and initialize the associated handle.

  * @param  husart USART handle.

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_USART_Init(USART_HandleTypeDef *husart)

{

  /* Check the USART handle allocation */

  if (husart == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_USART_INSTANCE(husart->Instance));

  if (husart->State == HAL_USART_STATE_RESET)

  {

    /* Allocate lock resource and initialize it */

    husart->Lock = HAL_UNLOCKED;

#if (USE_HAL_USART_REGISTER_CALLBACKS == 1)

    USART_InitCallbacksToDefault(husart);

    if (husart->MspInitCallback == NULL)

    {

      husart->MspInitCallback = HAL_USART_MspInit;

    }

    /* Init the low level hardware */

    husart->MspInitCallback(husart);

#else

    /* Init the low level hardware : GPIO, CLOCK */

    HAL_USART_MspInit(husart);

#endif /* USE_HAL_USART_REGISTER_CALLBACKS */

  }

  husart->State = HAL_USART_STATE_BUSY;

  /* Disable the Peripheral */

  __HAL_USART_DISABLE(husart);

  /* Set the Usart Communication parameters */

  if (USART_SetConfig(husart) == HAL_ERROR)

  {

    return HAL_ERROR;

  }

  /* In Synchronous mode, the following bits must be kept cleared:

  - LINEN bit (if LIN is supported) in the USART_CR2 register

  - SCEN (if Smartcard is supported), HDSEL and IREN (if IrDA is supported) bits in the USART_CR3 register.

  */

#if  defined (USART_CR2_LINEN)

  husart->Instance->CR2 &= ~USART_CR2_LINEN;

#endif /* USART_CR2_LINEN */

#if  defined (USART_CR3_SCEN)

#if  defined (USART_CR3_IREN)

  husart->Instance->CR3 &= ~(USART_CR3_SCEN | USART_CR3_HDSEL | USART_CR3_IREN);

#else

  husart->Instance->CR3 &= ~(USART_CR3_SCEN | USART_CR3_HDSEL);

#endif /* USART_CR3_IREN */

#else

#if  defined (USART_CR3_IREN)

  husart->Instance->CR3 &= ~(USART_CR3_HDSEL | USART_CR3_IREN);

#else

  husart->Instance->CR3 &= ~(USART_CR3_HDSEL);

#endif /* USART_CR3_IREN */

#endif /* USART_CR3_SCEN */

  /* Enable the Peripheral */

  __HAL_USART_ENABLE(husart);

  /* TEACK and/or REACK to check before moving husart->State to Ready */

  return (USART_CheckIdleState(husart));

}

/**

  * @brief DeInitialize the USART peripheral.

  * @param  husart USART handle.

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_USART_DeInit(USART_HandleTypeDef *husart)

{

  /* Check the USART handle allocation */

  if (husart == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_USART_INSTANCE(husart->Instance));

  husart->State = HAL_USART_STATE_BUSY;

  husart->Instance->CR1 = 0x0U;

  husart->Instance->CR2 = 0x0U;

  husart->Instance->CR3 = 0x0U;

#if (USE_HAL_USART_REGISTER_CALLBACKS == 1)

  if (husart->MspDeInitCallback == NULL)

  {

    husart->MspDeInitCallback = HAL_USART_MspDeInit;

  }

  /* DeInit the low level hardware */

  husart->MspDeInitCallback(husart);

#else

  /* DeInit the low level hardware */

  HAL_USART_MspDeInit(husart);

#endif /* USE_HAL_USART_REGISTER_CALLBACKS */

  husart->ErrorCode = HAL_USART_ERROR_NONE;

  husart->State = HAL_USART_STATE_RESET;

  /* Process Unlock */

  __HAL_UNLOCK(husart);

  return HAL_OK;

}

/**

  * @brief Initialize the USART MSP.

  * @param husart USART handle.

  * @retval None

  */

__weak void HAL_USART_MspInit(USART_HandleTypeDef *husart)

{

  /* Prevent unused argument(s) compilation warning */

  UNUSED(husart);

  /* NOTE : This function should not be modified, when the callback is needed,

            the HAL_USART_MspInit can be implemented in the user file

   */

}

/**

  * @brief DeInitialize the USART MSP.

  * @param husart USART handle.

  * @retval None

  */

__weak void HAL_USART_MspDeInit(USART_HandleTypeDef *husart)

{

  /* Prevent unused argument(s) compilation warning */

  UNUSED(husart);

  /* NOTE : This function should not be modified, when the callback is needed,

            the HAL_USART_MspDeInit can be implemented in the user file

   */

}

#if (USE_HAL_USART_REGISTER_CALLBACKS == 1)

/**

  * @brief  Register a User USART Callback

  *         To be used instead of the weak predefined callback

  * @param  husart usart handle

  * @param  CallbackID ID of the callback to be registered

  *         This parameter can be one of the following values:

  *           @arg @ref HAL_USART_TX_HALFCOMPLETE_CB_ID Tx Half Complete Callback ID

  *           @arg @ref HAL_USART_TX_COMPLETE_CB_ID Tx Complete Callback ID

  *           @arg @ref HAL_USART_RX_HALFCOMPLETE_CB_ID Rx Half Complete Callback ID

  *           @arg @ref HAL_USART_RX_COMPLETE_CB_ID Rx Complete Callback ID

  *           @arg @ref HAL_USART_TX_RX_COMPLETE_CB_ID Rx Complete Callback ID

  *           @arg @ref HAL_USART_ERROR_CB_ID Error Callback ID

  *           @arg @ref HAL_USART_ABORT_COMPLETE_CB_ID Abort Complete Callback ID

  *           @arg @ref HAL_USART_MSPINIT_CB_ID MspInit Callback ID

  *           @arg @ref HAL_USART_MSPDEINIT_CB_ID MspDeInit Callback ID

  * @param  pCallback pointer to the Callback function

  * @retval HAL status

+  */

HAL_StatusTypeDef HAL_USART_RegisterCallback(USART_HandleTypeDef *husart, HAL_USART_CallbackIDTypeDef CallbackID,

                                             pUSART_CallbackTypeDef pCallback)

{

  HAL_StatusTypeDef status = HAL_OK;

  if (pCallback == NULL)

  {

    /* Update the error code */

    husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;

    return HAL_ERROR;

  }

  /* Process locked */

  __HAL_LOCK(husart);

  if (husart->State == HAL_USART_STATE_READY)

  {

    switch (CallbackID)

    {

      case HAL_USART_TX_HALFCOMPLETE_CB_ID :

        husart->TxHalfCpltCallback = pCallback;

        break;

      case HAL_USART_TX_COMPLETE_CB_ID :

        husart->TxCpltCallback = pCallback;

        break;

      case HAL_USART_RX_HALFCOMPLETE_CB_ID :

        husart->RxHalfCpltCallback = pCallback;

        break;

      case HAL_USART_RX_COMPLETE_CB_ID :

        husart->RxCpltCallback = pCallback;

        break;

      case HAL_USART_TX_RX_COMPLETE_CB_ID :

        husart->TxRxCpltCallback = pCallback;

        break;

      case HAL_USART_ERROR_CB_ID :

        husart->ErrorCallback = pCallback;

        break;

      case HAL_USART_ABORT_COMPLETE_CB_ID :

        husart->AbortCpltCallback = pCallback;

        break;

      case HAL_USART_MSPINIT_CB_ID :

        husart->MspInitCallback = pCallback;

        break;

      case HAL_USART_MSPDEINIT_CB_ID :

        husart->MspDeInitCallback = pCallback;

        break;

      default :

        /* Update the error code */

        husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;

        /* Return error status */

        status =  HAL_ERROR;

        break;

    }

  }

  else if (husart->State == HAL_USART_STATE_RESET)

  {

    switch (CallbackID)

    {

      case HAL_USART_MSPINIT_CB_ID :

        husart->MspInitCallback = pCallback;

        break;

      case HAL_USART_MSPDEINIT_CB_ID :

        husart->MspDeInitCallback = pCallback;

        break;

      default :

        /* Update the error code */

        husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;

        /* Return error status */

        status =  HAL_ERROR;

        break;

    }

  }

  else

  {

    /* Update the error code */

    husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;

    /* Return error status */

    status =  HAL_ERROR;

  }

  /* Release Lock */

  __HAL_UNLOCK(husart);

  return status;

}

/**

  * @brief  Unregister an USART Callback

  *         USART callaback is redirected to the weak predefined callback

  * @param  husart usart handle

  * @param  CallbackID ID of the callback to be unregistered

  *         This parameter can be one of the following values:

  *           @arg @ref HAL_USART_TX_HALFCOMPLETE_CB_ID Tx Half Complete Callback ID

  *           @arg @ref HAL_USART_TX_COMPLETE_CB_ID Tx Complete Callback ID

  *           @arg @ref HAL_USART_RX_HALFCOMPLETE_CB_ID Rx Half Complete Callback ID

  *           @arg @ref HAL_USART_RX_COMPLETE_CB_ID Rx Complete Callback ID

  *           @arg @ref HAL_USART_TX_RX_COMPLETE_CB_ID Rx Complete Callback ID

  *           @arg @ref HAL_USART_ERROR_CB_ID Error Callback ID

  *           @arg @ref HAL_USART_ABORT_COMPLETE_CB_ID Abort Complete Callback ID

  *           @arg @ref HAL_USART_MSPINIT_CB_ID MspInit Callback ID

  *           @arg @ref HAL_USART_MSPDEINIT_CB_ID MspDeInit Callback ID

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_USART_UnRegisterCallback(USART_HandleTypeDef *husart, HAL_USART_CallbackIDTypeDef CallbackID)

{

  HAL_StatusTypeDef status = HAL_OK;

  /* Process locked */

  __HAL_LOCK(husart);

  if (HAL_USART_STATE_READY == husart->State)

  {

    switch (CallbackID)

    {

      case HAL_USART_TX_HALFCOMPLETE_CB_ID :

        husart->TxHalfCpltCallback = HAL_USART_TxHalfCpltCallback;               /* Legacy weak  TxHalfCpltCallback  */

        break;

      case HAL_USART_TX_COMPLETE_CB_ID :

        husart->TxCpltCallback = HAL_USART_TxCpltCallback;                       /* Legacy weak TxCpltCallback       */

        break;

      case HAL_USART_RX_HALFCOMPLETE_CB_ID :

        husart->RxHalfCpltCallback = HAL_USART_RxHalfCpltCallback;               /* Legacy weak RxHalfCpltCallback   */

        break;

      case HAL_USART_RX_COMPLETE_CB_ID :

        husart->RxCpltCallback = HAL_USART_RxCpltCallback;                       /* Legacy weak RxCpltCallback       */

        break;

      case HAL_USART_TX_RX_COMPLETE_CB_ID :

        husart->TxRxCpltCallback = HAL_USART_TxRxCpltCallback;                   /* Legacy weak TxRxCpltCallback     */

        break;

      case HAL_USART_ERROR_CB_ID :

        husart->ErrorCallback = HAL_USART_ErrorCallback;                         /* Legacy weak ErrorCallback        */

        break;

      case HAL_USART_ABORT_COMPLETE_CB_ID :

        husart->AbortCpltCallback = HAL_USART_AbortCpltCallback;                 /* Legacy weak AbortCpltCallback    */

        break;

      case HAL_USART_MSPINIT_CB_ID :

        husart->MspInitCallback = HAL_USART_MspInit;                             /* Legacy weak MspInitCallback      */

        break;

      case HAL_USART_MSPDEINIT_CB_ID :

        husart->MspDeInitCallback = HAL_USART_MspDeInit;                         /* Legacy weak MspDeInitCallback    */

        break;

      default :

        /* Update the error code */

        husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;

        /* Return error status */

        status =  HAL_ERROR;

        break;

    }

  }

  else if (HAL_USART_STATE_RESET == husart->State)

  {

    switch (CallbackID)

    {

      case HAL_USART_MSPINIT_CB_ID :

        husart->MspInitCallback = HAL_USART_MspInit;

        break;

      case HAL_USART_MSPDEINIT_CB_ID :

        husart->MspDeInitCallback = HAL_USART_MspDeInit;

        break;

      default :

        /* Update the error code */

        husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;

        /* Return error status */

        status =  HAL_ERROR;

        break;

    }

  }

  else

  {

    /* Update the error code */

    husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;

    /* Return error status */

    status =  HAL_ERROR;

  }

  /* Release Lock */

  __HAL_UNLOCK(husart);

  return status;

}

#endif /* USE_HAL_USART_REGISTER_CALLBACKS */

/**

  * @}

  */

/** @defgroup USART_Exported_Functions_Group2 IO operation functions

  * @brief   USART Transmit and Receive functions

  *

@verbatim

 ===============================================================================

                      ##### IO operation functions #####

 ===============================================================================

    [..] This subsection provides a set of functions allowing to manage the USART synchronous

    data transfers.

    [..] The USART supports master mode only: it cannot receive or send data related to an input

         clock (SCLK is always an output).

    [..]

    (#) There are two modes of transfer:

        (++) Blocking mode: The communication is performed in polling mode.

             The HAL status of all data processing is returned by the same function

             after finishing transfer.

        (++) No-Blocking mode: The communication is performed using Interrupts

             or DMA, These API's return the HAL status.

             The end of the data processing will be indicated through the

             dedicated USART IRQ when using Interrupt mode or the DMA IRQ when

             using DMA mode.

             The HAL_USART_TxCpltCallback(), HAL_USART_RxCpltCallback() and HAL_USART_TxRxCpltCallback() user callbacks

             will be executed respectively at the end of the transmit or Receive process

             The HAL_USART_ErrorCallback()user callback will be executed when a communication error is detected

    (#) Blocking mode API's are :

        (++) HAL_USART_Transmit() in simplex mode

        (++) HAL_USART_Receive() in full duplex receive only

        (++) HAL_USART_TransmitReceive() in full duplex mode

    (#) Non-Blocking mode API's with Interrupt are :

        (++) HAL_USART_Transmit_IT() in simplex mode

        (++) HAL_USART_Receive_IT() in full duplex receive only

        (++) HAL_USART_TransmitReceive_IT() in full duplex mode

        (++) HAL_USART_IRQHandler()

    (#) No-Blocking mode API's  with DMA are :

        (++) HAL_USART_Transmit_DMA() in simplex mode

        (++) HAL_USART_Receive_DMA() in full duplex receive only

        (++) HAL_USART_TransmitReceive_DMA() in full duplex mode

        (++) HAL_USART_DMAPause()

        (++) HAL_USART_DMAResume()

        (++) HAL_USART_DMAStop()

    (#) A set of Transfer Complete Callbacks are provided in Non_Blocking mode:

        (++) HAL_USART_TxCpltCallback()

        (++) HAL_USART_RxCpltCallback()

        (++) HAL_USART_TxHalfCpltCallback()

        (++) HAL_USART_RxHalfCpltCallback()

        (++) HAL_USART_ErrorCallback()

        (++) HAL_USART_TxRxCpltCallback()

    (#) Non-Blocking mode transfers could be aborted using Abort API's :

        (++) HAL_USART_Abort()

        (++) HAL_USART_Abort_IT()

    (#) For Abort services based on interrupts (HAL_USART_Abort_IT), a Abort Complete Callbacks is provided:

        (++) HAL_USART_AbortCpltCallback()

    (#) In Non-Blocking mode transfers, possible errors are split into 2 categories.

        Errors are handled as follows :

        (++) Error is considered as Recoverable and non blocking : Transfer could go till end, but error severity is

             to be evaluated by user : this concerns Frame Error,

             Parity Error or Noise Error in Interrupt mode reception .

             Received character is then retrieved and stored in Rx buffer, Error code is set to allow user to identify

             error type, and HAL_USART_ErrorCallback() user callback is executed.

             Transfer is kept ongoing on USART side.

             If user wants to abort it, Abort services should be called by user.

        (++) Error is considered as Blocking : Transfer could not be completed properly and is aborted.

             This concerns Overrun Error In Interrupt mode reception and all errors in DMA mode.

             Error code is set to allow user to identify error type,

             and HAL_USART_ErrorCallback() user callback is executed.

@endverbatim

  * @{

  */

/**

  * @brief  Simplex send an amount of data in blocking mode.

  * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),

  *         the sent data is handled as a set of u16. In this case, Size must indicate the number

  *         of u16 provided through pTxData.

  * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),

  *         address of user data buffer containing data to be sent, should be aligned on a half word frontier (16 bits)

  *         (as sent data will be handled using u16 pointer cast). Depending on compilation chain,

  *         use of specific alignment compilation directives or pragmas might be required

  *         to ensure proper alignment for pTxData.

  * @param  husart USART handle.

  * @param  pTxData Pointer to data buffer (u8 or u16 data elements).

  * @param  Size Amount of data elements (u8 or u16) to be sent.

  * @param  Timeout Timeout duration.

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_USART_Transmit(USART_HandleTypeDef *husart, uint8_t *pTxData, uint16_t Size, uint32_t Timeout)

{

  uint8_t  *ptxdata8bits;

  uint16_t *ptxdata16bits;

  uint32_t tickstart;

  if (husart->State == HAL_USART_STATE_READY)

  {

    if ((pTxData == NULL) || (Size == 0U))

    {

      return  HAL_ERROR;

    }

    /* In case of 9bits/No Parity transfer, pTxData buffer provided as input parameter

       should be aligned on a u16 frontier, as data to be filled into TDR will be

       handled through a u16 cast. */

    if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))

    {

      if ((((uint32_t)pTxData) & 1U) != 0U)

      {

        return  HAL_ERROR;

      }

    }

    /* Process Locked */

    __HAL_LOCK(husart);

    husart->ErrorCode = HAL_USART_ERROR_NONE;

    husart->State = HAL_USART_STATE_BUSY_TX;

    /* Init tickstart for timeout management */

    tickstart = HAL_GetTick();

    husart->TxXferSize = Size;

    husart->TxXferCount = Size;

    /* In case of 9bits/No Parity transfer, pTxData needs to be handled as a uint16_t pointer */

    if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))

    {

      ptxdata8bits  = NULL;

      ptxdata16bits = (uint16_t *) pTxData;

    }

    else

    {

      ptxdata8bits  = pTxData;

      ptxdata16bits = NULL;

    }

    /* Check the remaining data to be sent */

    while (husart->TxXferCount > 0U)

    {

      if (USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)

      {

        return HAL_TIMEOUT;

      }

      if (ptxdata8bits == NULL)

      {

        husart->Instance->TDR = (uint16_t)(*ptxdata16bits & 0x01FFU);

        ptxdata16bits++;

      }

      else

      {

        husart->Instance->TDR = (uint8_t)(*ptxdata8bits & 0xFFU);

        ptxdata8bits++;

      }

      husart->TxXferCount--;

    }

    if (USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)

    {

      return HAL_TIMEOUT;

    }

    /* Clear Transmission Complete Flag */

    __HAL_USART_CLEAR_FLAG(husart, USART_CLEAR_TCF);

    /* Clear overrun flag and discard the received data */

    __HAL_USART_CLEAR_OREFLAG(husart);

    __HAL_USART_SEND_REQ(husart, USART_RXDATA_FLUSH_REQUEST);

#if   defined(USART_RQR_TXFRQ)

    __HAL_USART_SEND_REQ(husart, USART_TXDATA_FLUSH_REQUEST);

#endif /* USART_RQR_TXFRQ */

    /* At end of Tx process, restore husart->State to Ready */

    husart->State = HAL_USART_STATE_READY;

    /* Process Unlocked */

    __HAL_UNLOCK(husart);

    return HAL_OK;

  }

  else

  {

    return HAL_BUSY;

  }

}

/**

  * @brief Receive an amount of data in blocking mode.

  * @note   To receive synchronous data, dummy data are simultaneously transmitted.

  * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),

  *         the received data is handled as a set of u16. In this case, Size must indicate the number

  *         of u16 available through pRxData.

  * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),

  *         address of user data buffer for storing data to be received, should be aligned on a half word frontier (16 bits)

  *         (as received data will be handled using u16 pointer cast). Depending on compilation chain,

  *         use of specific alignment compilation directives or pragmas might be required to ensure proper alignment for pRxData.

  * @param husart USART handle.

  * @param pRxData Pointer to data buffer (u8 or u16 data elements).

  * @param Size Amount of data elements (u8 or u16) to be received.

  * @param Timeout Timeout duration.

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_USART_Receive(USART_HandleTypeDef *husart, uint8_t *pRxData, uint16_t Size, uint32_t Timeout)

{

  uint8_t  *prxdata8bits;

  uint16_t *prxdata16bits;

  uint16_t uhMask;

  uint32_t tickstart;

  if (husart->State == HAL_USART_STATE_READY)

  {

    if ((pRxData == NULL) || (Size == 0U))

    {

      return  HAL_ERROR;

    }

    /* In case of 9bits/No Parity transfer, pRxData buffer provided as input parameter

       should be aligned on a u16 frontier, as data to be received from RDR will be

       handled through a u16 cast. */

    if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))

    {

      if ((((uint32_t)pRxData) & 1U) != 0U)

      {

        return  HAL_ERROR;

      }

    }

    /* Process Locked */

    __HAL_LOCK(husart);

    husart->ErrorCode = HAL_USART_ERROR_NONE;

    husart->State = HAL_USART_STATE_BUSY_RX;

    /* Init tickstart for timeout management */

    tickstart = HAL_GetTick();

    husart->RxXferSize = Size;

    husart->RxXferCount = Size;

    /* Computation of USART mask to apply to RDR register */

    USART_MASK_COMPUTATION(husart);

    uhMask = husart->Mask;

    /* In case of 9bits/No Parity transfer, pRxData needs to be handled as a uint16_t pointer */

    if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))

    {

      prxdata8bits  = NULL;

      prxdata16bits = (uint16_t *) pRxData;

    }

    else

    {

      prxdata8bits  = pRxData;

      prxdata16bits = NULL;

    }

    /* as long as data have to be received */

    while (husart->RxXferCount > 0U)

    {

      {

        /* Wait until TXE flag is set to send dummy byte in order to generate the

        * clock for the slave to send data.

        * Whatever the frame length (7, 8 or 9-bit long), the same dummy value