text: /**
    ******************************************************************************
    * @file    stm32wlxx_ll_i2c.c
    * @author  MCD Application Team
    * @brief   I2C LL module driver.
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; Copyright (c) 2019 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
    *
    ******************************************************************************
    */
  #if defined(USE_FULL_LL_DRIVER)
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32wlxx_ll_i2c.h"
  #include "stm32wlxx_ll_bus.h"
  #ifdef  USE_FULL_ASSERT
  #include "stm32_assert.h"
  #else
  #define assert_param(expr) ((void)0U)
  #endif
  
  /** @addtogroup STM32WLxx_LL_Driver
    * @{
    */
  
  #if defined (I2C1) || defined (I2C2) || defined (I2C3)
  
  /** @defgroup I2C_LL I2C
    * @{
    */
  
  /* Private types -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private constants ---------------------------------------------------------*/
  /* Private macros ------------------------------------------------------------*/
  /** @addtogroup I2C_LL_Private_Macros
    * @{
    */
  
  #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__)    (((__VALUE__) == LL_I2C_MODE_I2C)          || \
                                                   ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST)   || \
                                                   ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \
                                                   ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP))
  
  #define IS_LL_I2C_ANALOG_FILTER(__VALUE__)      (((__VALUE__) == LL_I2C_ANALOGFILTER_ENABLE) || \
                                                   ((__VALUE__) == LL_I2C_ANALOGFILTER_DISABLE))
  
  #define IS_LL_I2C_DIGITAL_FILTER(__VALUE__)     ((__VALUE__) <= 0x0000000FU)
  
  #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__)       ((__VALUE__) <= 0x000003FFU)
  
  #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__)   (((__VALUE__) == LL_I2C_ACK) || \
                                                   ((__VALUE__) == LL_I2C_NACK))
  
  #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__)       (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
                                                   ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
  /**
    * @}
    */
  
  /* Private function prototypes -----------------------------------------------*/
  
  /* Exported functions --------------------------------------------------------*/
  /** @addtogroup I2C_LL_Exported_Functions
    * @{
    */
  
  /** @addtogroup I2C_LL_EF_Init
    * @{
    */
  
  /**
    * @brief  De-initialize the I2C registers to their default reset values.
    * @param  I2Cx I2C Instance.
    * @retval An ErrorStatus enumeration value:
    *          - SUCCESS: I2C registers are de-initialized
    *          - ERROR: I2C registers are not de-initialized
    */
  ErrorStatus LL_I2C_DeInit(I2C_TypeDef *I2Cx)
  {
    ErrorStatus status = SUCCESS;
  
    /* Check the I2C Instance I2Cx */
    assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
  
    if (I2Cx == I2C1)
    {
      /* Force reset of I2C clock */
      LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
  
      /* Release reset of I2C clock */
      LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
    }
    else if (I2Cx == I2C2)
    {
      /* Force reset of I2C clock */
      LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);
  
      /* Release reset of I2C clock */
      LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);
  
    }
    else if (I2Cx == I2C3)
    {
      /* Force reset of I2C clock */
      LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C3);
  
      /* Release reset of I2C clock */
      LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C3);
    }
    else
    {
      status = ERROR;
    }
  
    return status;
  }
  
  /**
    * @brief  Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
    * @param  I2Cx I2C Instance.
    * @param  I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
    * @retval An ErrorStatus enumeration value:
    *          - SUCCESS: I2C registers are initialized
    *          - ERROR: Not applicable
    */
  ErrorStatus LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct)
  {
    /* Check the I2C Instance I2Cx */
    assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
  
    /* Check the I2C parameters from I2C_InitStruct */
    assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
    assert_param(IS_LL_I2C_ANALOG_FILTER(I2C_InitStruct->AnalogFilter));
    assert_param(IS_LL_I2C_DIGITAL_FILTER(I2C_InitStruct->DigitalFilter));
    assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
    assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
    assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
  
    /* Disable the selected I2Cx Peripheral */
    LL_I2C_Disable(I2Cx);
  
    /*---------------------------- I2Cx CR1 Configuration ------------------------
     * Configure the analog and digital noise filters with parameters :
     * - AnalogFilter: I2C_CR1_ANFOFF bit
     * - DigitalFilter: I2C_CR1_DNF[3:0] bits
     */
    LL_I2C_ConfigFilters(I2Cx, I2C_InitStruct->AnalogFilter, I2C_InitStruct->DigitalFilter);
  
    /*---------------------------- I2Cx TIMINGR Configuration --------------------
     * Configure the SDA setup, hold time and the SCL high, low period with parameter :
     * - Timing: I2C_TIMINGR_PRESC[3:0], I2C_TIMINGR_SCLDEL[3:0], I2C_TIMINGR_SDADEL[3:0],
     *           I2C_TIMINGR_SCLH[7:0] and I2C_TIMINGR_SCLL[7:0] bits
     */
    LL_I2C_SetTiming(I2Cx, I2C_InitStruct->Timing);
  
    /* Enable the selected I2Cx Peripheral */
    LL_I2C_Enable(I2Cx);
  
    /*---------------------------- I2Cx OAR1 Configuration -----------------------
     * Disable, Configure and Enable I2Cx device own address 1 with parameters :
     * - OwnAddress1:  I2C_OAR1_OA1[9:0] bits
     * - OwnAddrSize:  I2C_OAR1_OA1MODE bit
     */
    LL_I2C_DisableOwnAddress1(I2Cx);
    LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
  
    /* OwnAdress1 == 0 is reserved for General Call address */
    if (I2C_InitStruct->OwnAddress1 != 0U)
    {
      LL_I2C_EnableOwnAddress1(I2Cx);
    }
  
    /*---------------------------- I2Cx MODE Configuration -----------------------
    * Configure I2Cx peripheral mode with parameter :
     * - PeripheralMode: I2C_CR1_SMBDEN and I2C_CR1_SMBHEN bits
     */
    LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
  
    /*---------------------------- I2Cx CR2 Configuration ------------------------
     * Configure the ACKnowledge or Non ACKnowledge condition
     * after the address receive match code or next received byte with parameter :
     * - TypeAcknowledge: I2C_CR2_NACK bit
     */
    LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
  
    return SUCCESS;
  }
  
  /**
    * @brief  Set each @ref LL_I2C_InitTypeDef field to default value.
    * @param  I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
    * @retval None
    */
  void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
  {
    /* Set I2C_InitStruct fields to default values */
    I2C_InitStruct->PeripheralMode  = LL_I2C_MODE_I2C;
    I2C_InitStruct->Timing          = 0U;
    I2C_InitStruct->AnalogFilter    = LL_I2C_ANALOGFILTER_ENABLE;
    I2C_InitStruct->DigitalFilter   = 0U;
    I2C_InitStruct->OwnAddress1     = 0U;
    I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
    I2C_InitStruct->OwnAddrSize     = LL_I2C_OWNADDRESS1_7BIT;
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  #endif /* I2C1 || I2C2 || I2C3 */
  
  /**
    * @}
    */
  
  #endif /* USE_FULL_LL_DRIVER */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  