File content as of revision 189:f392fc9709a3:

/**
  ******************************************************************************
  * @file    stm32l0xx_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.


  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 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 "stm32l0xx_hal.h"

/** @addtogroup STM32L0xx_HAL_Driver
  * @{
  */

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

#ifdef HAL_UART_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macros ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/** @defgroup UARTEx_Private_Functions UARTEx Private Functions
  * @{
  */
static void UARTEx_Wakeup_AddressConfig(UART_HandleTypeDef *huart, UART_WakeUpTypeDef WakeUpSelection);
/**
  * @}
  */

/* 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 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;

    /* Init the low level hardware : GPIO, CLOCK, CORTEX */
    HAL_UART_MspInit(huart);
  }

  huart->gState = HAL_UART_STATE_BUSY;

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

  /* Set the UART Communication parameters */
  if(huart->AdvancedInit.AdvFeatureInit != UART_ADVFEATURE_NO_INIT)
  {
    UART_AdvFeatureConfig(huart);
  }

  if (UART_SetConfig(huart) == HAL_ERROR)
  {
    return HAL_ERROR;
  }

  /* 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_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_EnableClockStopMode() API enables the UART HSI clock during stop mode   
     (+) HAL_UARTEx_DisableClockStopMode() API disables the above functionality   
     (+) HAL_UARTEx_WakeupCallback() called upon UART wakeup interrupt


@endverbatim
  * @{
  */




/**
  * @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 and/or huart->RxState to Ready */
  return (UART_CheckIdleState(huart));
}


/**
  * @brief Set Wakeup from Stop mode interrupt flag selection.
  * @param huart: UART handle.
  * @param WakeUpSelection: address match, Start Bit detection or RXNE 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 = 0;

  /* 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);

  huart->gState = HAL_UART_STATE_BUSY;

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

  huart->gState = HAL_UART_STATE_READY;

  /* 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);

  huart->gState = HAL_UART_STATE_BUSY;

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

  huart->gState = HAL_UART_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}

/**
  * @brief Enable UART Clock in Stop Mode
  * The UART keeps the Clock ON during Stop mode
  * @param huart: uart handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UARTEx_EnableClockStopMode(UART_HandleTypeDef *huart)
{
  /* Process Locked */
  __HAL_LOCK(huart);
  
  huart->gState = HAL_UART_STATE_BUSY;
  
  /* Set UCESM bit */
  SET_BIT(huart->Instance->CR3, USART_CR3_UCESM);
  
  huart->gState = HAL_UART_STATE_READY;
  
  /* Process Unlocked */
  __HAL_UNLOCK(huart);
  
  return HAL_OK; 
}

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

  huart->gState = HAL_UART_STATE_BUSY;

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

  huart->gState = HAL_UART_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(huart);

  return HAL_OK;
}

/**
  * @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.
   */
}

/**
  * @}
  */

/**
  * @}
  */

/** @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));
  if(WakeUpSelection.AddressLength == UART_ADDRESS_DETECT_4B)
  {
    assert_param(IS_UART_4B_ADDRESS(WakeUpSelection.Address));
  }
  else
  {
    assert_param(IS_UART_7B_ADDRESS(WakeUpSelection.Address));
  }

  /* 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));
}

/**
  * @}
  */

#endif /* HAL_UART_MODULE_ENABLED */

/**
  * @}
  */

/**
  * @}
  */

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