text: /**
    ******************************************************************************
    * @file    stm32l0xx_hal_i2c_ex.c
    * @author  MCD Application Team
    * @version V1.7.0
    * @date    31-May-2016
    * @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 STM32L0XX
         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
     
                       ##### How to use this driver #####
    ==============================================================================
    [..] This driver provides functions to configure Noise Filter
      (#) 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_DisbleFastModePlus()
    @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
    * @{
    */
  #ifdef HAL_I2C_MODULE_ENABLED
  
  /** @addtogroup I2CEx
    * @brief I2C Extended HAL module driver
    * @{
    */
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  /* Private functions ---------------------------------------------------------*/
  
  /** @addtogroup I2CEx_Exported_Functions
    * @{
    */
  
  /** @addtogroup I2CEx_Exported_Functions_Group1
    * @brief    Extended features functions
   *
  @verbatim   
   ===============================================================================
                        ##### Extended features functions #####
   ===============================================================================  
      [..] This section provides functions allowing to:
        (+) Configure Noise Filters 
  
  @endverbatim
    * @{
    */
    
  /**
    * @brief  Configures 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_BUSY) || (hi2c->State == HAL_I2C_STATE_MASTER_BUSY_TX) || (hi2c->State == HAL_I2C_STATE_MASTER_BUSY_RX)
       || (hi2c->State == HAL_I2C_STATE_SLAVE_BUSY_TX) || (hi2c->State == HAL_I2C_STATE_SLAVE_BUSY_RX))
    {
      return HAL_BUSY;
    }
    
    /* 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; 
  }
  
  /**
    * @brief  Configures 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 0x00 and 0x0F.
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_I2CEx_ConfigDigitalFilter(I2C_HandleTypeDef *hi2c, uint32_t DigitalFilter)
  {
    uint32_t tmpreg = 0U;
    
    /* Check the parameters */
    assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));
    assert_param(IS_I2C_DIGITAL_FILTER(DigitalFilter));
    
    if((hi2c->State == HAL_I2C_STATE_BUSY) || (hi2c->State == HAL_I2C_STATE_MASTER_BUSY_TX) || (hi2c->State == HAL_I2C_STATE_MASTER_BUSY_RX)
       || (hi2c->State == HAL_I2C_STATE_SLAVE_BUSY_TX) || (hi2c->State == HAL_I2C_STATE_SLAVE_BUSY_RX))
    {
      return HAL_BUSY;
    }
    
    /* 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; 
  }  
  
  /**
    * @brief  Enables I2C wakeup from stop mode.
    * @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_BUSY) || (hi2c->State == HAL_I2C_STATE_MASTER_BUSY_TX) || (hi2c->State == HAL_I2C_STATE_MASTER_BUSY_RX)
       || (hi2c->State == HAL_I2C_STATE_SLAVE_BUSY_TX) || (hi2c->State == HAL_I2C_STATE_SLAVE_BUSY_RX))
    {
      return HAL_BUSY;
    }
    
    /* 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; 
  }  
  
  
  /**
    * @brief  Disables I2C wakeup from stop mode.
    * @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_BUSY) || (hi2c->State == HAL_I2C_STATE_MASTER_BUSY_TX) || (hi2c->State == HAL_I2C_STATE_MASTER_BUSY_RX)
       || (hi2c->State == HAL_I2C_STATE_SLAVE_BUSY_TX) || (hi2c->State == HAL_I2C_STATE_SLAVE_BUSY_RX))
    {
      return HAL_BUSY;
    }
    
    /* 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; 
  }  
  
  /**
    * @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.
    * @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.
    * @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****/
  
  