text: /**
    ******************************************************************************
    * @file    stm32l4xx_ll_swpmi.c
    * @author  MCD Application Team
    * @version V1.6.0
    * @date    28-October-2016
    * @brief   SWPMI LL module driver.
    ******************************************************************************
    * @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.
    *
    ******************************************************************************
    */
  #if defined(USE_FULL_LL_DRIVER)
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32l4xx_ll_swpmi.h"
  #include "stm32l4xx_ll_bus.h"
  #ifdef  USE_FULL_ASSERT
  #include "stm32_assert.h"
  #else
  #define assert_param(expr) ((void)0U)
  #endif
  
  /** @addtogroup STM32L4xx_LL_Driver
    * @{
    */
  
  #if defined (SWPMI1)
  
  /** @addtogroup SWPMI_LL
    * @{
    */
  
  /* Private types -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private constants ---------------------------------------------------------*/
  /* Private macros ------------------------------------------------------------*/
  /** @addtogroup SWPMI_LL_Private_Macros
    * @{
    */
  
  #define IS_LL_SWPMI_BITRATE_VALUE(__VALUE__) (((__VALUE__) <= 63))
  
  #define IS_LL_SWPMI_SW_BUFFER_RX(__VALUE__) (((__VALUE__) == LL_SWPMI_SW_BUFFER_RX_SINGLE) \
                                            || ((__VALUE__) == LL_SWPMI_SW_BUFFER_RX_MULTI))
  
  #define IS_LL_SWPMI_SW_BUFFER_TX(__VALUE__) (((__VALUE__) == LL_SWPMI_SW_BUFFER_TX_SINGLE) \
                                            || ((__VALUE__) == LL_SWPMI_SW_BUFFER_TX_MULTI))
  
  #define IS_LL_SWPMI_VOLTAGE_CLASS(__VALUE__) (((__VALUE__) == LL_SWPMI_VOLTAGE_CLASS_C) \
                                             || ((__VALUE__) == LL_SWPMI_VOLTAGE_CLASS_B))
  
  /**
    * @}
    */
  
  /* Private function prototypes -----------------------------------------------*/
  
  /* Exported functions --------------------------------------------------------*/
  /** @addtogroup SWPMI_LL_Exported_Functions
    * @{
    */
  
  /** @addtogroup SWPMI_LL_EF_Init
    * @{
    */
  
  /**
    * @brief  De-initialize the SWPMI peripheral registers to their default reset values.
    * @param  SWPMIx SWPMI Instance
    * @retval An ErrorStatus enumeration value
    *          - SUCCESS: SWPMI registers are de-initialized
    *          - ERROR: Not applicable
    */
  ErrorStatus LL_SWPMI_DeInit(SWPMI_TypeDef *SWPMIx)
  {
    /* Check the parameter */
    assert_param(IS_SWPMI_INSTANCE(SWPMIx));
  
    LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_SWPMI1);
    LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_SWPMI1);
  
    return SUCCESS;
  }
  
  /**
    * @brief  Initialize the SWPMI peripheral according to the specified parameters in the SWPMI_InitStruct.
    * @note   As some bits in SWPMI configuration registers can only be written when the SWPMI is deactivated (SWPMI_CR_SWPACT bit = 0),
    *         SWPMI IP should be in deactivated state prior calling this function. Otherwise, ERROR result will be returned.
    * @param  SWPMIx           SWPMI Instance
    * @param  SWPMI_InitStruct pointer to a @ref LL_SWPMI_InitTypeDef structure that contains
    *                          the configuration information for the SWPMI peripheral.
    * @retval An ErrorStatus enumeration value
    *          - SUCCESS: SWPMI registers are initialized
    *          - ERROR: SWPMI registers are not initialized
    */
  ErrorStatus LL_SWPMI_Init(SWPMI_TypeDef *SWPMIx, LL_SWPMI_InitTypeDef *SWPMI_InitStruct)
  {
    ErrorStatus status = SUCCESS;
    
    /* Check the parameters */
    assert_param(IS_SWPMI_INSTANCE(SWPMIx));
    assert_param(IS_LL_SWPMI_BITRATE_VALUE(SWPMI_InitStruct->BitRatePrescaler));
    assert_param(IS_LL_SWPMI_SW_BUFFER_TX(SWPMI_InitStruct->TxBufferingMode));
    assert_param(IS_LL_SWPMI_SW_BUFFER_RX(SWPMI_InitStruct->RxBufferingMode));
    assert_param(IS_LL_SWPMI_VOLTAGE_CLASS(SWPMI_InitStruct->VoltageClass));
  
    /* SWPMI needs to be in deactivated state, in order to be able to configure some bits */
    if (LL_SWPMI_IsActivated(SWPMIx) == 0)
    {
      /* Configure the BRR register (Bitrate) */
      LL_SWPMI_SetBitRatePrescaler(SWPMIx, SWPMI_InitStruct->BitRatePrescaler);
  
      /* Configure the voltage class */
      LL_SWPMI_SetVoltageClass(SWPMIx, SWPMI_InitStruct->VoltageClass);
  
      /* Set the new configuration of the SWPMI peripheral */
      MODIFY_REG(SWPMIx->CR,
                (SWPMI_CR_RXMODE | SWPMI_CR_TXMODE),
                (SWPMI_InitStruct->TxBufferingMode | SWPMI_InitStruct->RxBufferingMode));
    }
    /* Else (SWPMI not in deactivated state => return ERROR) */
    else
    {
      status = ERROR;
    }
  
    return status;
  }
  
  /**
    * @brief  Set each @ref LL_SWPMI_InitTypeDef field to default value.
    * @param  SWPMI_InitStruct pointer to a @ref LL_SWPMI_InitTypeDef structure that contains
    *                          the configuration information for the SWPMI peripheral.
    * @retval None
    */
  void LL_SWPMI_StructInit(LL_SWPMI_InitTypeDef *SWPMI_InitStruct)
  {
    /* Set SWPMI_InitStruct fields to default values */
    SWPMI_InitStruct->VoltageClass     = LL_SWPMI_VOLTAGE_CLASS_C;
    SWPMI_InitStruct->BitRatePrescaler = (uint32_t)0x00000001;
    SWPMI_InitStruct->TxBufferingMode  = LL_SWPMI_SW_BUFFER_TX_SINGLE;
    SWPMI_InitStruct->RxBufferingMode  = LL_SWPMI_SW_BUFFER_RX_SINGLE;
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  #endif /* defined (SWPMI1) */
  
  /**
    * @}
    */
  
  #endif /* USE_FULL_LL_DRIVER */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  