stm32l4xx_hal_uart_ex.c

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/**
  ******************************************************************************
  * @file    stm32l4xx_hal_uart_ex.c
  * @author  MCD Application Team
  * @brief   Extended UART HAL module driver.
  *          This file provides firmware functions to manage the following extended
  *          functionalities of the Universal Asynchronous Receiver Transmitter Peripheral (UART).
  *           + Initialization and de-initialization functions
  *           + Peripheral Control functions
  *
  *
  @verbatim
  ==============================================================================
               ##### UART peripheral extended features  #####
  ==============================================================================

    (#) Declare a UART_HandleTypeDef handle structure.

    (#) For the UART RS485 Driver Enable mode, initialize the UART registers
        by calling the HAL_RS485Ex_Init() API.

    (#) FIFO mode enabling/disabling and RX/TX FIFO threshold programming.

        -@- When UART operates in FIFO mode, FIFO mode must be enabled prior
            starting RX/TX transfers. Also RX/TX FIFO thresholds must be
            configured prior starting RX/TX transfers.

  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32l4xx_hal.h"

/** @addtogroup STM32L4xx_HAL_Driver
  * @{
  */

/** @defgroup UARTEx UARTEx
  * @brief UART Extended HAL module driver
  * @{
  */

#ifdef HAL_UART_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#if defined(USART_CR1_FIFOEN)
/* UART RX FIFO depth */
#define RX_FIFO_DEPTH 8U

/* UART TX FIFO depth */
#define TX_FIFO_DEPTH 8U
#endif

/* Private macros ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/** @defgroup UARTEx_Private_Functions UARTEx Private Functions
  * @{
  */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
extern void UART_InitCallbacksToDefault(UART_HandleTypeDef *huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
static void UARTEx_Wakeup_AddressConfig(UART_HandleTypeDef *huart, UART_WakeUpTypeDef WakeUpSelection);
#if defined(USART_CR1_FIFOEN)
static void UARTEx_SetNbDataToProcess(UART_HandleTypeDef *huart);
#endif
/**
  * @}
  */

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

/** @defgroup UARTEx_Exported_Functions  UARTEx Exported Functions
  * @{
  */

/** @defgroup UARTEx_Exported_Functions_Group1 Initialization and de-initialization functions
  * @brief    Extended Initialization and Configuration Functions
  *
@verbatim
===============================================================================
            ##### Initialization and Configuration functions #####
 ===============================================================================
    [..]
    This subsection provides a set of functions allowing to initialize the USARTx or the UARTy
    in asynchronous mode.
      (+) For the asynchronous mode the parameters below 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.
        (++) Hardware flow control
        (++) Receiver/transmitter modes
        (++) Over Sampling Method
        (++) One-Bit Sampling Method
      (+) For the asynchronous mode, the following advanced features can be configured as well:
        (++) TX and/or RX pin level inversion
        (++) data logical level inversion
        (++) RX and TX pins swap
        (++) RX overrun detection disabling
        (++) DMA disabling on RX error
        (++) MSB first on communication line
        (++) auto Baud rate detection
    [..]
    The HAL_RS485Ex_Init() API follows the UART RS485 mode configuration
     procedures (details for the procedures are available in reference manual).

@endverbatim

  Depending on the frame length defined by the M1 and M0 bits (7-bit,
  8-bit or 9-bit), the possible UART formats are listed in the
  following table.

    Table 1. UART frame format.
    +-----------------------------------------------------------------------+
    |  M1 bit |  M0 bit |  PCE bit  |             UART 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 RS485 Driver enable feature according to the specified
  *         parameters in the UART_InitTypeDef and creates the associated handle.
  * @param huart            UART handle.
  * @param Polarity         Select the driver enable polarity.
  *          This parameter can be one of the following values:
  *          @arg @ref UART_DE_POLARITY_HIGH DE signal is active high
  *          @arg @ref UART_DE_POLARITY_LOW  DE signal is active low
  * @param AssertionTime    Driver Enable assertion time:
  *       5-bit value defining the time between the activation of the DE (Driver Enable)
  *       signal and the beginning of the start bit. It is expressed in sample time
  *       units (1/8 or 1/16 bit time, depending on the oversampling rate)
  * @param DeassertionTime  Driver Enable deassertion time:
  *       5-bit value defining the time between the end of the last stop bit, in a
  *       transmitted message, and the de-activation of the DE (Driver Enable) signal.
  *       It is expressed in sample time units (1/8 or 1/16 bit time, depending on the
  *       oversampling rate).
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RS485Ex_Init(UART_HandleTypeDef *huart, uint32_t Polarity, uint32_t AssertionTime, uint32_t DeassertionTime)
{
  uint32_t temp = 0x0U;

  /* Check the UART handle allocation */
  if (huart == NULL)
  {
    return HAL_ERROR;
  }
  /* Check the Driver Enable UART instance */
  assert_param(IS_UART_DRIVER_ENABLE_INSTANCE(huart->Instance));

  /* Check the Driver Enable polarity */
  assert_param(IS_UART_DE_POLARITY(Polarity));

  /* Check the Driver Enable assertion time */
  assert_param(IS_UART_ASSERTIONTIME(AssertionTime));

  /* Check the Driver Enable deassertion time */
  assert_param(IS_UART_DEASSERTIONTIME(DeassertionTime));

  if (huart->gState == HAL_UART_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    huart->Lock = HAL_UNLOCKED;

#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
    UART_InitCallbacksToDefault(huart);

    if (huart->MspInitCallback == NULL)
    {
      huart->MspInitCallback = HAL_UART_MspInit;
    }

    /* Init the low level hardware */
    huart->MspInitCallback(huart);
#else
    /* Init the low level hardware : GPIO, CLOCK, CORTEX */
    HAL_UART_MspInit(huart);
#endif /* (USE_HAL_UART_REGISTER_CALLBACKS) */
  }

  huart->gState = HAL_UART_STATE_BUSY;

  /* Disable the Peripheral */
  __HAL_UART_DISABLE(huart);

  /* Set the UART Communication parameters */
  if (UART_SetConfig(huart) == HAL_ERROR)
  {
    return HAL_ERROR;
  }

  if (huart->AdvancedInit.AdvFeatureInit != UART_ADVFEATURE_NO_INIT)
  {
    UART_AdvFeatureConfig(huart);
  }

  /* Enable the Driver Enable mode by setting the DEM bit in the CR3 register */
  SET_BIT(huart->Instance->CR3, USART_CR3_DEM);

  /* Set the Driver Enable polarity */
  MODIFY_REG(huart->Instance->CR3, USART_CR3_DEP, Polarity);

  /* Set the Driver Enable assertion and deassertion times */
  temp = (AssertionTime << UART_CR1_DEAT_ADDRESS_LSB_POS);
  temp |= (DeassertionTime << UART_CR1_DEDT_ADDRESS_LSB_POS);
  MODIFY_REG(huart->Instance->CR1, (USART_CR1_DEDT | USART_CR1_DEAT), temp);

  /* Enable the Peripheral */
  __HAL_UART_ENABLE(huart);

  /* TEACK and/or REACK to check before moving huart->gState and huart->RxState to Ready */
  return (UART_CheckIdleState(huart));
}


/**
  * @}
  */

/** @defgroup UARTEx_Exported_Functions_Group2 IO operation functions
  *  @brief Extended functions
  *
@verbatim
 ===============================================================================
                      ##### IO operation functions #####
 ===============================================================================
    This subsection provides a set of Wakeup and FIFO mode related callback functions.

    (#) Wakeup from Stop mode Callback:
        (+) HAL_UARTEx_WakeupCallback()

    (#) TX/RX Fifos Callbacks:
        (+) HAL_UARTEx_RxFifoFullCallback()
        (+) HAL_UARTEx_TxFifoEmptyCallback()

@endverbatim
  * @{
  */

/**
  * @brief UART wakeup from Stop mode callback.
  * @param huart UART handle.
  * @retval None
  */
__weak void HAL_UARTEx_WakeupCallback(UART_HandleTypeDef *huart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(huart);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_UARTEx_WakeupCallback can be implemented in the user file.
   */
}

#if defined(USART_CR1_FIFOEN)
/**
  * @brief  UART RX Fifo full callback.
  * @param  huart UART handle.
  * @retval None
  */
__weak void HAL_UARTEx_RxFifoFullCallback(UART_HandleTypeDef *huart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(huart);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_UARTEx_RxFifoFullCallback can be implemented in the user file.
   */
}

/**
  * @brief  UART TX Fifo empty callback.
  * @param  huart UART handle.
  * @retval None
  */
__weak void HAL_UARTEx_TxFifoEmptyCallback(UART_HandleTypeDef *huart)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(huart);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_UARTEx_TxFifoEmptyCallback can be implemented in the user file.
   */
}
#endif

/**
  * @}
  */

/** @defgroup UARTEx_Exported_Functions_Group3 Peripheral Control functions
  * @brief    Extended Peripheral Control functions
 *
@verbatim
 ===============================================================================
                      ##### Peripheral Control functions #####
 ===============================================================================
    [..] This section provides the following functions:
     (+) HAL_UARTEx_EnableClockStopMode() API enables the UART clock (HSI or LSE only) during stop mode
     (+) HAL_UARTEx_DisableClockStopMode() API disables the above functionality
     (+) HAL_MultiProcessorEx_AddressLength_Set() API optionally sets the UART node address
         detection length to more than 4 bits for multiprocessor address mark wake up.
     (+) HAL_UARTEx_StopModeWakeUpSourceConfig() API defines the wake-up from stop mode
         trigger: address match, Start Bit detection or RXNE bit status.
     (+) HAL_UARTEx_EnableStopMode() API enables the UART to wake up the MCU from stop mode
     (+) HAL_UARTEx_DisableStopMode() API disables the above functionality
     (+) HAL_UARTEx_WakeupCallback() called upon UART wakeup interrupt
     (+) HAL_UARTEx_EnableFifoMode() API enables the FIFO mode
     (+) HAL_UARTEx_DisableFifoMode() API disables the FIFO mode
     (+) HAL_UARTEx_SetTxFifoThreshold() API sets the TX FIFO threshold
     (+) HAL_UARTEx_SetRxFifoThreshold() API sets the RX FIFO threshold

@endverbatim
  * @{
  */



#if defined(USART_CR3_UCESM)
/**
  * @brief  Keep UART Clock enabled when in Stop Mode.
  * @note   When the USART clock source is configured to be LSE or HSI, it is possible to keep enabled
  *         this clock during STOP mode by setting the UCESM bit in USART_CR3 control register.
  * @note   When LPUART is used to wakeup from stop with LSE is selected as LPUART clock source, 
  *         and desired baud rate is 9600 baud, the bit UCESM bit in LPUART_CR3 control register must be set.
  * @param  huart UART handle.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_EnableClockStopMode(UART_HandleTypeDef *huart)
{
  /* Process Locked */
  __HAL_LOCK(huart);

  /* Set UCESM bit */
  SET_BIT(huart->Instance->CR3, USART_CR3_UCESM);

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}

/**
  * @brief  Disable UART Clock when in Stop Mode.
  * @param  huart UART handle.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_DisableClockStopMode(UART_HandleTypeDef *huart)
{
  /* Process Locked */
  __HAL_LOCK(huart);

  /* Clear UCESM bit */
  CLEAR_BIT(huart->Instance->CR3, USART_CR3_UCESM);

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}
#endif /* USART_CR3_UCESM */

/**
  * @brief By default in multiprocessor mode, when the wake up method is set
  *        to address mark, the UART handles only 4-bit long addresses detection;
  *        this API allows to enable longer addresses detection (6-, 7- or 8-bit
  *        long).
  * @note  Addresses detection lengths are: 6-bit address detection in 7-bit data mode,
  *        7-bit address detection in 8-bit data mode, 8-bit address detection in 9-bit data mode.
  * @param huart         UART handle.
  * @param AddressLength This parameter can be one of the following values:
  *          @arg @ref UART_ADDRESS_DETECT_4B 4-bit long address
  *          @arg @ref UART_ADDRESS_DETECT_7B 6-, 7- or 8-bit long address
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_MultiProcessorEx_AddressLength_Set(UART_HandleTypeDef *huart, uint32_t AddressLength)
{
  /* Check the UART handle allocation */
  if (huart == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the address length parameter */
  assert_param(IS_UART_ADDRESSLENGTH_DETECT(AddressLength));

  huart->gState = HAL_UART_STATE_BUSY;

  /* Disable the Peripheral */
  __HAL_UART_DISABLE(huart);

  /* Set the address length */
  MODIFY_REG(huart->Instance->CR2, USART_CR2_ADDM7, AddressLength);

  /* Enable the Peripheral */
  __HAL_UART_ENABLE(huart);

  /* TEACK and/or REACK to check before moving huart->gState to Ready */
  return (UART_CheckIdleState(huart));
}


/**
  * @brief Set Wakeup from Stop mode interrupt flag selection.
  * @note It is the application responsibility to enable the interrupt used as
  *       usart_wkup interrupt source before entering low-power mode.
  * @param huart           UART handle.
  * @param WakeUpSelection Address match, Start Bit detection or RXNE/RXFNE bit status.
  *          This parameter can be one of the following values:
  *          @arg @ref UART_WAKEUP_ON_ADDRESS
  *          @arg @ref UART_WAKEUP_ON_STARTBIT
  *          @arg @ref UART_WAKEUP_ON_READDATA_NONEMPTY
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_StopModeWakeUpSourceConfig(UART_HandleTypeDef *huart, UART_WakeUpTypeDef WakeUpSelection)
{
  HAL_StatusTypeDef status = HAL_OK;
  uint32_t tickstart = 0U;

  /* check the wake-up from stop mode UART instance */
  assert_param(IS_UART_WAKEUP_FROMSTOP_INSTANCE(huart->Instance));
  /* check the wake-up selection parameter */
  assert_param(IS_UART_WAKEUP_SELECTION(WakeUpSelection.WakeUpEvent));

  /* Process Locked */
  __HAL_LOCK(huart);

  huart->gState = HAL_UART_STATE_BUSY;

  /* Disable the Peripheral */
  __HAL_UART_DISABLE(huart);

  /* Set the wake-up selection scheme */
  MODIFY_REG(huart->Instance->CR3, USART_CR3_WUS, WakeUpSelection.WakeUpEvent);

  if (WakeUpSelection.WakeUpEvent == UART_WAKEUP_ON_ADDRESS)
  {
    UARTEx_Wakeup_AddressConfig(huart, WakeUpSelection);
  }

  /* Enable the Peripheral */
  __HAL_UART_ENABLE(huart);

  /* Init tickstart for timeout managment*/
  tickstart = HAL_GetTick();

  /* Wait until REACK flag is set */
  if (UART_WaitOnFlagUntilTimeout(huart, USART_ISR_REACK, RESET, tickstart, HAL_UART_TIMEOUT_VALUE) != HAL_OK)
  {
    status = HAL_TIMEOUT;
  }
  else
  {
    /* Initialize the UART State */
    huart->gState = HAL_UART_STATE_READY;
  }

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return status;
}


/**
  * @brief Enable UART Stop Mode.
  * @note The UART is able to wake up the MCU from Stop 1 mode as long as UART clock is HSI or LSE.
  * @param huart UART handle.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_EnableStopMode(UART_HandleTypeDef *huart)
{
  /* Process Locked */
  __HAL_LOCK(huart);

  /* Set UESM bit */
  SET_BIT(huart->Instance->CR1, USART_CR1_UESM);

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}

/**
  * @brief Disable UART Stop Mode.
  * @param huart UART handle.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_DisableStopMode(UART_HandleTypeDef *huart)
{
  /* Process Locked */
  __HAL_LOCK(huart);

  /* Clear UESM bit */
  CLEAR_BIT(huart->Instance->CR1, USART_CR1_UESM);

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}

#if defined(USART_CR1_FIFOEN)
/**
  * @brief  Enable the FIFO mode.
  * @param huart      UART handle.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_EnableFifoMode(UART_HandleTypeDef *huart)
{
  uint32_t tmpcr1 = 0U;

  /* Check parameters */
  assert_param(IS_UART_FIFO_INSTANCE(huart->Instance));

  /* Process Locked */
  __HAL_LOCK(huart);

  huart->gState = HAL_UART_STATE_BUSY;

  /* Save actual UART configuration */
  tmpcr1 = READ_REG(huart->Instance->CR1);

  /* Disable UART */
  __HAL_UART_DISABLE(huart);

  /* Enable FIFO mode */
  SET_BIT(tmpcr1, USART_CR1_FIFOEN);
  huart->FifoMode = UART_FIFOMODE_ENABLE;

  /* Restore UART configuration */
  WRITE_REG(huart->Instance->CR1, tmpcr1);

  /* Determine the number of data to process during RX/TX ISR execution */
  UARTEx_SetNbDataToProcess(huart);

  huart->gState = HAL_UART_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}

/**
  * @brief  Disable the FIFO mode.
  * @param huart      UART handle.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_DisableFifoMode(UART_HandleTypeDef *huart)
{
  uint32_t tmpcr1 = 0U;

  /* Check parameters */
  assert_param(IS_UART_FIFO_INSTANCE(huart->Instance));

  /* Process Locked */
  __HAL_LOCK(huart);

  huart->gState = HAL_UART_STATE_BUSY;

  /* Save actual UART configuration */
  tmpcr1 = READ_REG(huart->Instance->CR1);

  /* Disable UART */
  __HAL_UART_DISABLE(huart);

  /* Enable FIFO mode */
  CLEAR_BIT(tmpcr1, USART_CR1_FIFOEN);
  huart->FifoMode = UART_FIFOMODE_DISABLE;

  /* Restore UART configuration */
  WRITE_REG(huart->Instance->CR1, tmpcr1);

  huart->gState = HAL_UART_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}

/**
  * @brief  Set the TXFIFO threshold.
  * @param huart      UART handle.
  * @param Threshold  TX FIFO threshold value
  *          This parameter can be one of the following values:
  *            @arg @ref UART_TXFIFO_THRESHOLD_1_8
  *            @arg @ref UART_TXFIFO_THRESHOLD_1_4
  *            @arg @ref UART_TXFIFO_THRESHOLD_1_2
  *            @arg @ref UART_TXFIFO_THRESHOLD_3_4
  *            @arg @ref UART_TXFIFO_THRESHOLD_7_8
  *            @arg @ref UART_TXFIFO_THRESHOLD_8_8
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_SetTxFifoThreshold(UART_HandleTypeDef *huart, uint32_t Threshold)
{
  uint32_t tmpcr1 = 0U;

  /* Check parameters */
  assert_param(IS_UART_FIFO_INSTANCE(huart->Instance));
  assert_param(IS_UART_TXFIFO_THRESHOLD(Threshold));

  /* Process Locked */
  __HAL_LOCK(huart);

  huart->gState = HAL_UART_STATE_BUSY;

  /* Save actual UART configuration */
  tmpcr1 = READ_REG(huart->Instance->CR1);

  /* Disable UART */
  __HAL_UART_DISABLE(huart);

  /* Update TX threshold configuration */
  MODIFY_REG(huart->Instance->CR3, USART_CR3_TXFTCFG, Threshold);

  /* Determine the number of data to process during RX/TX ISR execution */
  UARTEx_SetNbDataToProcess(huart);

  /* Restore UART configuration */
  WRITE_REG(huart->Instance->CR1, tmpcr1);

  huart->gState = HAL_UART_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}

/**
  * @brief  Set the RXFIFO threshold.
  * @param huart      UART handle.
  * @param Threshold  RX FIFO threshold value
  *          This parameter can be one of the following values:
  *            @arg @ref UART_RXFIFO_THRESHOLD_1_8
  *            @arg @ref UART_RXFIFO_THRESHOLD_1_4
  *            @arg @ref UART_RXFIFO_THRESHOLD_1_2
  *            @arg @ref UART_RXFIFO_THRESHOLD_3_4
  *            @arg @ref UART_RXFIFO_THRESHOLD_7_8
  *            @arg @ref UART_RXFIFO_THRESHOLD_8_8
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_SetRxFifoThreshold(UART_HandleTypeDef *huart, uint32_t Threshold)
{
  uint32_t tmpcr1 = 0U;

  /* Check the parameters */
  assert_param(IS_UART_FIFO_INSTANCE(huart->Instance));
  assert_param(IS_UART_RXFIFO_THRESHOLD(Threshold));

  /* Process Locked */
  __HAL_LOCK(huart);

  huart->gState = HAL_UART_STATE_BUSY;

  /* Save actual UART configuration */
  tmpcr1 = READ_REG(huart->Instance->CR1);

  /* Disable UART */
  __HAL_UART_DISABLE(huart);

  /* Update RX threshold configuration */
  MODIFY_REG(huart->Instance->CR3, USART_CR3_RXFTCFG, Threshold);

  /* Determine the number of data to process during RX/TX ISR execution */
  UARTEx_SetNbDataToProcess(huart);

  /* Restore UART configuration */
  WRITE_REG(huart->Instance->CR1, tmpcr1);

  huart->gState = HAL_UART_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}
#endif

/**
  * @}
  */

/**
  * @}
  */

/** @addtogroup UARTEx_Private_Functions
  * @{
  */

/**
  * @brief Initialize the UART wake-up from stop mode parameters when triggered by address detection.
  * @param huart           UART handle.
  * @param WakeUpSelection UART wake up from stop mode parameters.
  * @retval None
  */
static void UARTEx_Wakeup_AddressConfig(UART_HandleTypeDef *huart, UART_WakeUpTypeDef WakeUpSelection)
{
  assert_param(IS_UART_ADDRESSLENGTH_DETECT(WakeUpSelection.AddressLength));

  /* Set the USART address length */
  MODIFY_REG(huart->Instance->CR2, USART_CR2_ADDM7, WakeUpSelection.AddressLength);

  /* Set the USART address node */
  MODIFY_REG(huart->Instance->CR2, USART_CR2_ADD, ((uint32_t)WakeUpSelection.Address << UART_CR2_ADDRESS_LSB_POS));
}

#if defined(USART_CR1_FIFOEN)
/**
  * @brief Calculate the number of data to process in RX/TX ISR.
  * @note The RX FIFO depth and the TX FIFO depth is extracted from
  *       the UART configuration registers.
  * @param huart UART handle.
  * @retval None
  */
static void UARTEx_SetNbDataToProcess(UART_HandleTypeDef *huart)
{
  uint8_t rx_fifo_depth;
  uint8_t tx_fifo_depth;
  uint8_t rx_fifo_threshold;
  uint8_t tx_fifo_threshold;
  uint8_t numerator[] = {1U, 1U, 1U, 3U, 7U, 1U};
  uint8_t denominator[] = {8U, 4U, 2U, 4U, 8U, 1U};

  if (huart->FifoMode == UART_FIFOMODE_DISABLE)
  {
    huart->NbTxDataToProcess = 1U;
    huart->NbRxDataToProcess = 1U;
  }
  else
  {
    rx_fifo_depth = RX_FIFO_DEPTH;
    tx_fifo_depth = TX_FIFO_DEPTH;
    rx_fifo_threshold = (uint8_t)(READ_BIT(huart->Instance->CR3, USART_CR3_RXFTCFG) >> USART_CR3_RXFTCFG_Pos);
    tx_fifo_threshold = (uint8_t)(READ_BIT(huart->Instance->CR3, USART_CR3_TXFTCFG) >> USART_CR3_TXFTCFG_Pos);
    huart->NbTxDataToProcess = (uint8_t)(tx_fifo_depth * numerator[tx_fifo_threshold]) / denominator[tx_fifo_threshold];
    huart->NbRxDataToProcess = (uint8_t)(rx_fifo_depth * numerator[rx_fifo_threshold]) / denominator[rx_fifo_threshold];
  }
}
#endif
/**
  * @}
  */

#endif /* HAL_UART_MODULE_ENABLED */

/**
  * @}
  */

/**
  * @}
  */

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