text: /**
    ******************************************************************************
    * @file    stm32l4xx_hal_i2c_ex.c
    * @author  MCD Application Team
    * @brief   I2C Extended HAL module driver.
    *          This file provides firmware functions to manage the following
    *          functionalities of I2C Extended peripheral:
    *           + Extended features functions
    *
    @verbatim
    ==============================================================================
                 ##### I2C peripheral Extended features  #####
    ==============================================================================
  
    [..] Comparing to other previous devices, the I2C interface for STM32L4xx
         devices contains the following additional features
  
         (+) Possibility to disable or enable Analog Noise Filter
         (+) Use of a configured Digital Noise Filter
         (+) Disable or enable wakeup from Stop mode(s)
         (+) Disable or enable Fast Mode Plus
  
                       ##### How to use this driver #####
    ==============================================================================
    [..] This driver provides functions to configure Noise Filter and Wake Up Feature
      (#) Configure I2C Analog noise filter using the function HAL_I2CEx_ConfigAnalogFilter()
      (#) Configure I2C Digital noise filter using the function HAL_I2CEx_ConfigDigitalFilter()
      (#) Configure the enable or disable of I2C Wake Up Mode using the functions :
            (++) HAL_I2CEx_EnableWakeUp()
            (++) HAL_I2CEx_DisableWakeUp()
      (#) Configure the enable or disable of fast mode plus driving capability using the functions :
            (++) HAL_I2CEx_EnableFastModePlus()
            (++) HAL_I2CEx_DisableFastModePlus()
    @endverbatim
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; Copyright (c) 2017 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 "stm32l4xx_hal.h"
  
  /** @addtogroup STM32L4xx_HAL_Driver
    * @{
    */
  
  /** @defgroup I2CEx I2CEx
    * @brief I2C Extended HAL module driver
    * @{
    */
  
  #ifdef HAL_I2C_MODULE_ENABLED
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  /* Private functions ---------------------------------------------------------*/
  
  /** @defgroup I2CEx_Exported_Functions I2C Extended Exported Functions
    * @{
    */
  
  /** @defgroup I2CEx_Exported_Functions_Group1 Extended features functions
    * @brief    Extended features functions
   *
  @verbatim
   ===============================================================================
                        ##### Extended features functions #####
   ===============================================================================
      [..] This section provides functions allowing to:
        (+) Configure Noise Filters
        (+) Configure Wake Up Feature
        (+) Configure Fast Mode Plus
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Configure I2C Analog noise filter.
    * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains
    *                the configuration information for the specified I2Cx peripheral.
    * @param  AnalogFilter New state of the Analog filter.
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_I2CEx_ConfigAnalogFilter(I2C_HandleTypeDef *hi2c, uint32_t AnalogFilter)
  {
    /* Check the parameters */
    assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));
    assert_param(IS_I2C_ANALOG_FILTER(AnalogFilter));
  
    if (hi2c->State == HAL_I2C_STATE_READY)
    {
      /* Process Locked */
      __HAL_LOCK(hi2c);
  
      hi2c->State = HAL_I2C_STATE_BUSY;
  
      /* Disable the selected I2C peripheral */
      __HAL_I2C_DISABLE(hi2c);
  
      /* Reset I2Cx ANOFF bit */
      hi2c->Instance->CR1 &= ~(I2C_CR1_ANFOFF);
  
      /* Set analog filter bit*/
      hi2c->Instance->CR1 |= AnalogFilter;
  
      __HAL_I2C_ENABLE(hi2c);
  
      hi2c->State = HAL_I2C_STATE_READY;
  
      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);
  
      return HAL_OK;
    }
    else
    {
      return HAL_BUSY;
    }
  }
  
  /**
    * @brief  Configure I2C Digital noise filter.
    * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains
    *                the configuration information for the specified I2Cx peripheral.
    * @param  DigitalFilter Coefficient of digital noise filter between Min_Data=0x00 and Max_Data=0x0F.
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_I2CEx_ConfigDigitalFilter(I2C_HandleTypeDef *hi2c, uint32_t DigitalFilter)
  {
    uint32_t tmpreg;
  
    /* Check the parameters */
    assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));
    assert_param(IS_I2C_DIGITAL_FILTER(DigitalFilter));
  
    if (hi2c->State == HAL_I2C_STATE_READY)
    {
      /* Process Locked */
      __HAL_LOCK(hi2c);
  
      hi2c->State = HAL_I2C_STATE_BUSY;
  
      /* Disable the selected I2C peripheral */
      __HAL_I2C_DISABLE(hi2c);
  
      /* Get the old register value */
      tmpreg = hi2c->Instance->CR1;
  
      /* Reset I2Cx DNF bits [11:8] */
      tmpreg &= ~(I2C_CR1_DNF);
  
      /* Set I2Cx DNF coefficient */
      tmpreg |= DigitalFilter << 8U;
  
      /* Store the new register value */
      hi2c->Instance->CR1 = tmpreg;
  
      __HAL_I2C_ENABLE(hi2c);
  
      hi2c->State = HAL_I2C_STATE_READY;
  
      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);
  
      return HAL_OK;
    }
    else
    {
      return HAL_BUSY;
    }
  }
  
  /**
    * @brief  Enable I2C wakeup from Stop mode(s).
    * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains
    *                the configuration information for the specified I2Cx peripheral.
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_I2CEx_EnableWakeUp(I2C_HandleTypeDef *hi2c)
  {
    /* Check the parameters */
    assert_param(IS_I2C_WAKEUP_FROMSTOP_INSTANCE(hi2c->Instance));
  
    if (hi2c->State == HAL_I2C_STATE_READY)
    {
      /* Process Locked */
      __HAL_LOCK(hi2c);
  
      hi2c->State = HAL_I2C_STATE_BUSY;
  
      /* Disable the selected I2C peripheral */
      __HAL_I2C_DISABLE(hi2c);
  
      /* Enable wakeup from stop mode */
      hi2c->Instance->CR1 |= I2C_CR1_WUPEN;
  
      __HAL_I2C_ENABLE(hi2c);
  
      hi2c->State = HAL_I2C_STATE_READY;
  
      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);
  
      return HAL_OK;
    }
    else
    {
      return HAL_BUSY;
    }
  }
  
  /**
    * @brief  Disable I2C wakeup from Stop mode(s).
    * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains
    *                the configuration information for the specified I2Cx peripheral.
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_I2CEx_DisableWakeUp(I2C_HandleTypeDef *hi2c)
  {
    /* Check the parameters */
    assert_param(IS_I2C_WAKEUP_FROMSTOP_INSTANCE(hi2c->Instance));
  
    if (hi2c->State == HAL_I2C_STATE_READY)
    {
      /* Process Locked */
      __HAL_LOCK(hi2c);
  
      hi2c->State = HAL_I2C_STATE_BUSY;
  
      /* Disable the selected I2C peripheral */
      __HAL_I2C_DISABLE(hi2c);
  
      /* Enable wakeup from stop mode */
      hi2c->Instance->CR1 &= ~(I2C_CR1_WUPEN);
  
      __HAL_I2C_ENABLE(hi2c);
  
      hi2c->State = HAL_I2C_STATE_READY;
  
      /* Process Unlocked */
      __HAL_UNLOCK(hi2c);
  
      return HAL_OK;
    }
    else
    {
      return HAL_BUSY;
    }
  }
  
  /**
    * @brief Enable the I2C fast mode plus driving capability.
    * @param ConfigFastModePlus Selects the pin.
    *   This parameter can be one of the @ref I2CEx_FastModePlus values
    * @note  For I2C1, fast mode plus driving capability can be enabled on all selected
    *        I2C1 pins using I2C_FASTMODEPLUS_I2C1 parameter or independently
    *        on each one of the following pins PB6, PB7, PB8 and PB9.
    * @note  For remaining I2C1 pins (PA14, PA15...) fast mode plus driving capability
    *        can be enabled only by using I2C_FASTMODEPLUS_I2C1 parameter.
    * @note  For all I2C2 pins fast mode plus driving capability can be enabled
    *        only by using I2C_FASTMODEPLUS_I2C2 parameter.
    * @note  For all I2C3 pins fast mode plus driving capability can be enabled
    *        only by using I2C_FASTMODEPLUS_I2C3 parameter.
    * @note  For all I2C4 pins fast mode plus driving capability can be enabled
    *        only by using I2C_FASTMODEPLUS_I2C4 parameter.
    * @retval None
    */
  void HAL_I2CEx_EnableFastModePlus(uint32_t ConfigFastModePlus)
  {
    /* Check the parameter */
    assert_param(IS_I2C_FASTMODEPLUS(ConfigFastModePlus));
  
    /* Enable SYSCFG clock */
    __HAL_RCC_SYSCFG_CLK_ENABLE();
  
    /* Enable fast mode plus driving capability for selected pin */
    SET_BIT(SYSCFG->CFGR1, (uint32_t)ConfigFastModePlus);
  }
  
  /**
    * @brief Disable the I2C fast mode plus driving capability.
    * @param ConfigFastModePlus Selects the pin.
    *   This parameter can be one of the @ref I2CEx_FastModePlus values
    * @note  For I2C1, fast mode plus driving capability can be disabled on all selected
    *        I2C1 pins using I2C_FASTMODEPLUS_I2C1 parameter or independently
    *        on each one of the following pins PB6, PB7, PB8 and PB9.
    * @note  For remaining I2C1 pins (PA14, PA15...) fast mode plus driving capability
    *        can be disabled only by using I2C_FASTMODEPLUS_I2C1 parameter.
    * @note  For all I2C2 pins fast mode plus driving capability can be disabled
    *        only by using I2C_FASTMODEPLUS_I2C2 parameter.
    * @note  For all I2C3 pins fast mode plus driving capability can be disabled
    *        only by using I2C_FASTMODEPLUS_I2C3 parameter.
    * @note  For all I2C4 pins fast mode plus driving capability can be disabled
    *        only by using I2C_FASTMODEPLUS_I2C4 parameter.
    * @retval None
    */
  void HAL_I2CEx_DisableFastModePlus(uint32_t ConfigFastModePlus)
  {
    /* Check the parameter */
    assert_param(IS_I2C_FASTMODEPLUS(ConfigFastModePlus));
  
    /* Enable SYSCFG clock */
    __HAL_RCC_SYSCFG_CLK_ENABLE();
  
    /* Disable fast mode plus driving capability for selected pin */
    CLEAR_BIT(SYSCFG->CFGR1, (uint32_t)ConfigFastModePlus);
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  #endif /* HAL_I2C_MODULE_ENABLED */
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  