text: /**
    ******************************************************************************
    * @file    stm32l4xx_hal_comp.c
    * @author  MCD Application Team
    * @version V1.3.0
    * @date    29-January-2016
    * @brief   COMP HAL module driver.  
    *          This file provides firmware functions to manage the following 
    *          functionalities of the COMP peripheral:
    *           + Initialization and de-initialization functions
    *           + Start/Stop operation functions in polling mode.
    *           + Start/Stop operation functions in interrupt mode.
    *           + Peripheral Control functions
    *           + Peripheral State functions
    *         
    @verbatim
  ================================================================================
            ##### COMP Peripheral features #####
  ================================================================================
             
    [..]       
        The STM32L4xx device family integrates two analog comparators COMP1 and COMP2:
        (#) The inverting input (input minus) and non inverting input (input plus) can be set to the GPIO pins
            listed in the Reference Manual "COMP function description" chapter.
    
        (#) The COMP output is not configurable by the HAL COMP as on STM32F3 and STM32F0 
            series: redirection to TIMER peripheral is to set with HAL TIM input remapping functions.
    
        (#) The COMP output level is available using HAL_COMP_GetOutputLevel()
            and available on GPIO pins listed in the Reference Manual "COMP function description" chapter.
    
        (#) The comparators COMP1 and COMP2 can be combined in window mode.
    
        (#) The comparators COMP1 and COMP2 have interrupt capability with wake-up
            from Sleep and Stop modes (through the EXTI controller):
            (++) COMP1 is internally connected to EXTI Line 21
            (++) COMP2 is internally connected to EXTI Line 22
  
            From the corresponding IRQ handler, the right interrupt source can be retrieved with the 
            macros __HAL_COMP_COMP1_EXTI_GET_FLAG() and __HAL_COMP_COMP2_EXTI_GET_FLAG().
  
            
              ##### How to use this driver #####
  ================================================================================
    [..]
        This driver provides functions to configure and program the Comparators of all STM32L4xx devices.
  
        To use the comparator, perform the following steps:
    
        (#)  Initialize the COMP low level resources by implementing the HAL_COMP_MspInit():
        (++) Configure the inverting and non-inverting comparator inputs in analog mode using HAL_GPIO_Init().
        (++) Configure the comparator output in alternate function mode using HAL_GPIO_Init() to map the comparator 
             output to the GPIO pin.
        (++) If required enable the COMP interrupt by configuring and enabling EXTI line in Interrupt mode and 
             selecting the desired sensitivity level using HAL_GPIO_Init() function. After that enable the comparator
             interrupt vector using HAL_NVIC_EnableIRQ() function.
    
        (#) Configure the comparator using HAL_COMP_Init() function:
        (++) Select the inverting input (input minus)
        (++) Select the non-inverting input (input plus)
        (++) Select the hysteresis
        (++) Select the blanking source
        (++) Select the output polarity  
        (++) Select the power mode
        (++) Select the window mode
  
        -@@- HAL_COMP_Init() calls internally __HAL_RCC_SYSCFG_CLK_ENABLE() in order
            to enable the comparator(s).
  
        (#) On-the-fly reconfiguration of comparator(s) may be done by calling again HAL_COMP_Init(
            function with new input parameter values; HAL_COMP_MspInit() function shall be adapted 
            to support multi configurations.
  
        (#) Enable the comparator using HAL_COMP_Start() or HAL_COMP_Start_IT() functions.
      
        (#) Use HAL_COMP_TriggerCallback() and/or HAL_COMP_GetOutputLevel() functions
            to manage comparator outputs (events and output level).
  
        (#) Disable the comparator using HAL_COMP_Stop() or HAL_COMP_Stop_IT() 
            function.
  
        (#) De-initialize the comparator using HAL_COMP_DeInit() function.
  
        (#) For safety purposes comparator(s) can be locked using HAL_COMP_Lock() function.
            Only a MCU reset can reset that protection.
        
    @endverbatim
    ******************************************************************************
    
        Table 1. COMP Inputs for the STM32L4xx devices
        +---------------------------------------------------------+     
        |                        |                | COMP1 | COMP2 | 
        |------------------------|----------------|---------------|
        |                        | 1/4 VREFINT    |  OK   |  OK   |  
        |                        | 1/2 VREFINT    |  OK   |  OK   |
        |                        | 3/4 VREFINT    |  OK   |  OK   |
        | Inverting Input        | VREFINT        |  OK   |  OK   | 
        | (minus)                | DAC1 OUT       |  OK   |  OK   |  
        |                        | DAC2 OUT       |  OK   |  OK   |  
        |                        | IO1            |  PB1  |  PB3  |  
        |                        | IO2            |  PC4  |  PB7  |  
        |------------------------|----------------|-------|-------|
        |  Non Inverting Input   | IO1            |  PC5  |  PB4  |  
        |  (plus)                | IO2            |  PB2  |  PB6  |
        +--------------------------------------------------+  
    
        Table 2. COMP Outputs for the STM32L4xx devices
        +------------------------------------+     
        |       COMP1      |      COMP2      | 
        |------------------|-----------------|
        |      PB0 (AF)    |     PB5 (AF)    | 
        |      PB10 (AF)   |     PB11 (AF)   | 
        |------------------|-----------------|
        |  Embedded TIMERS | Embedded TIMERS | 
        |  (cf. HAL TIM)   | (cf. HAL TIM)   | 
        +------------------------------------+
  
    ******************************************************************************
    * @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 "stm32l4xx_hal.h"
  
  /** @addtogroup STM32L4xx_HAL_Driver
    * @{
    */
  
  /** @defgroup COMP COMP
    * @brief COMP HAL module driver
    * @{
    */
  
  #ifdef HAL_COMP_MODULE_ENABLED
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /** @addtogroup COMP_Private_Constants
    * @{
    */
  /* CSR register reset value */ 
  #define COMP_CSR_RESET_VALUE               ((uint32_t)0x00000000)
  
  /* CSR register Mask: all fields except read-only, lock and enable bits */ 
  #define COMP_CSR_UPDATE_PARAMETERS_MASK    (COMP_CSR_PWRMODE  | COMP_CSR_INMSEL   | COMP_CSR_INPSEL  | \
                                              COMP_CSR_WINMODE  | COMP_CSR_POLARITY | COMP_CSR_HYST    | \
                                              COMP_CSR_BLANKING | COMP_CSR_BRGEN    | COMP_CSR_SCALEN)
  
  #define COMP_LOCK_DISABLE                   ((uint32_t)0x00000000)
  #define COMP_LOCK_ENABLE                    COMP_CSR_LOCK
  
  #define COMP_STATE_BIT_LOCK                 ((uint8_t)0x10)
  
  /**
    * @}
    */
  
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  /* Exported functions --------------------------------------------------------*/
  
  /** @defgroup COMP_Exported_Functions COMP Exported Functions
    * @{
    */
  
  /** @defgroup COMP_Exported_Functions_Group1 Initialization/de-initialization functions 
   *  @brief    Initialization and de-initialization functions. 
   *
  @verbatim    
   ===============================================================================
                ##### Initialization and de-initialization functions #####
   ===============================================================================
      [..]  This section provides functions to initialize and de-initialize comparators 
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Initialize the COMP according to the specified
    *         parameters in the COMP_InitTypeDef and initialize the associated handle.
    * @note   If the selected comparator is locked, initialization can't be performed.
    *         To unlock the configuration, perform a system reset.
    * @param  hcomp  COMP handle
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_COMP_Init(COMP_HandleTypeDef *hcomp)
  {
    uint32_t          tmpcsr = 0;
    HAL_StatusTypeDef status = HAL_OK;
    
    /* Check the COMP handle allocation and lock status */
    if((hcomp == NULL) || ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
    {
      status = HAL_ERROR;
    }
    else
    {
      /* Check the parameters */
      assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
      assert_param(IS_COMP_INVERTINGINPUT(hcomp->Init.InvertingInput));
      assert_param(IS_COMP_NONINVERTINGINPUT(hcomp->Init.NonInvertingInput));
      assert_param(IS_COMP_OUTPUTPOL(hcomp->Init.OutputPol));
      assert_param(IS_COMP_MODE(hcomp->Init.Mode));
      assert_param(IS_COMP_HYSTERESIS(hcomp->Init.Hysteresis));
      assert_param(IS_COMP_BLANKINGSRCE(hcomp->Init.BlankingSrce)); 
      assert_param(IS_COMP_BLANKINGSRCE_INSTANCE(hcomp->Instance, hcomp->Init.BlankingSrce)); 
      assert_param(IS_COMP_TRIGGERMODE(hcomp->Init.TriggerMode));
  
      if(hcomp->Init.WindowMode != COMP_WINDOWMODE_DISABLE)
      {
        assert_param(IS_COMP_WINDOWMODE_INSTANCE(hcomp->Instance));
        assert_param(IS_COMP_WINDOWMODE(hcomp->Init.WindowMode));
      }
  
      /* Init SYSCFG and the low level hardware to access comparators */
      __HAL_RCC_SYSCFG_CLK_ENABLE();
      /* Init the low level hardware : SYSCFG to access comparators */
      HAL_COMP_MspInit(hcomp);
      
      if(hcomp->State == HAL_COMP_STATE_RESET)
      {
        /* Allocate lock resource and initialize it */
        hcomp->Lock = HAL_UNLOCKED;
      }
  
      /* Set COMP parameters */
      /*     Set INMSEL bits according to hcomp->Init.InvertingInput value       */
      /*     Set INPSEL bits according to hcomp->Init.NonInvertingInput value    */
      /*     Set BLANKING bits according to hcomp->Init.BlankingSrce value       */
      /*     Set HYST bits according to hcomp->Init.Hysteresis value             */
      /*     Set POLARITY bit according to hcomp->Init.OutputPol value           */
      /*     Set POWERMODE bits according to hcomp->Init.Mode value              */
      /*     Set WINMODE bit according to hcomp->Init.WindowMode value           */
      tmpcsr = hcomp->Init.InvertingInput    |  \
               hcomp->Init.NonInvertingInput |  \
               hcomp->Init.BlankingSrce      |  \
               hcomp->Init.Hysteresis        |  \
               hcomp->Init.OutputPol         |  \
               hcomp->Init.Mode              |  \
               hcomp->Init.WindowMode;
      
      /* Check VREFINT use for NonInvertingInput */
      if(hcomp->Init.InvertingInput == COMP_INVERTINGINPUT_VREFINT)
      {
        /* Enable voltage scaler to output VREFINT */
        tmpcsr |= COMP_CSR_SCALEN;
      }
      else
      {
        if((hcomp->Init.InvertingInput == COMP_INVERTINGINPUT_1_4VREFINT) ||
           (hcomp->Init.InvertingInput == COMP_INVERTINGINPUT_1_2VREFINT) ||
           (hcomp->Init.InvertingInput == COMP_INVERTINGINPUT_3_4VREFINT))
        {
          /* Enable voltage & bandgap scaler to output VREFINT */
          tmpcsr |= (COMP_CSR_BRGEN | COMP_CSR_SCALEN);
        }
      }
      
      MODIFY_REG(hcomp->Instance->CSR, COMP_CSR_UPDATE_PARAMETERS_MASK, tmpcsr);
  
      /* Update the COMP state*/
      if (hcomp->State == HAL_COMP_STATE_RESET)
      {
        /* From RESET state to READY State */
        hcomp->State = HAL_COMP_STATE_READY;
      }
      /* else: remain in READY or BUSY state (no update) */
    }
    
    return status;
  }
  
  /**
    * @brief  DeInitialize the COMP peripheral.
    * @note   Deinitialization cannot be performed if the COMP configuration is locked.
    *         To unlock the configuration, perform a system reset.
    * @param  hcomp  COMP handle
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_COMP_DeInit(COMP_HandleTypeDef *hcomp)
  {
    HAL_StatusTypeDef status = HAL_OK;
  
    /* Check the COMP handle allocation and lock status */
    if((hcomp == NULL) || ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
    {
      status = HAL_ERROR;
    }
    else
    {
      /* Check the parameter */
      assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
  
      /* Set COMP_CSR register to reset value */
      WRITE_REG(hcomp->Instance->CSR, COMP_CSR_RESET_VALUE);
  
      /* DeInit the low level hardware: SYSCFG, GPIO, CLOCK and NVIC */
      HAL_COMP_MspDeInit(hcomp);
  
      hcomp->State = HAL_COMP_STATE_RESET;
      
      /* Release Lock */
      __HAL_UNLOCK(hcomp);
    }
    
    return status;
  }
  
  /**
    * @brief  Initialize the COMP MSP.
    * @param  hcomp  COMP handle
    * @retval None
    */
  __weak void HAL_COMP_MspInit(COMP_HandleTypeDef *hcomp)
  {
    /* Prevent unused argument(s) compilation warning */
    UNUSED(hcomp);
  
    /* NOTE : This function should not be modified, when the callback is needed,
              the HAL_COMP_MspInit could be implemented in the user file
     */
  }
  
  /**
    * @brief  DeInitialize the COMP MSP.
    * @param  hcomp  COMP handle
    * @retval None
    */
  __weak void HAL_COMP_MspDeInit(COMP_HandleTypeDef *hcomp)
  {
    /* Prevent unused argument(s) compilation warning */
    UNUSED(hcomp);
  
    /* NOTE : This function should not be modified, when the callback is needed,
              the HAL_COMP_MspDeInit could be implemented in the user file
     */
  }
  
  /**
    * @}
    */
  
  /** @defgroup COMP_Exported_Functions_Group2 Start-Stop operation functions 
   *  @brief   Start-Stop operation functions. 
   *
  @verbatim   
   ===============================================================================
                        ##### COMP Start Stop operation functions #####
   ===============================================================================  
      [..]  This section provides functions allowing to:
        (+) Start a Comparator without interrupt.
        (+) Stop a Comparator without interrupt.
        (+) Start a Comparator with interrupt generation.
        (+) Stop a Comparator with interrupt generation.
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Start the comparator.
    * @param  hcomp  COMP handle
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_COMP_Start(COMP_HandleTypeDef *hcomp)
  { 
    HAL_StatusTypeDef status = HAL_OK;
    uint32_t extiline = 0;
    
    /* Check the COMP handle allocation and lock status */
    if((hcomp == NULL) || ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
    {
      status = HAL_ERROR;
    }
    else
    {
      /* Check the parameter */
      assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
  
      if(hcomp->State == HAL_COMP_STATE_READY)
      {
        /* Get the EXTI Line output configuration */
        extiline = COMP_GET_EXTI_LINE(hcomp->Instance);
  
        /* Configure the event generation */
        if((hcomp->Init.TriggerMode & (COMP_TRIGGERMODE_EVENT_RISING|COMP_TRIGGERMODE_EVENT_FALLING)) != RESET)
        {
          /* Configure the event trigger rising edge */
          if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_EVENT_RISING) != RESET)
          {
            SET_BIT(EXTI->RTSR1, extiline);
          }
          else
          {
            CLEAR_BIT(EXTI->RTSR1, extiline);
          }
  
          /* Configure the trigger falling edge */
          if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_EVENT_FALLING) != RESET)
          {
            SET_BIT(EXTI->FTSR1, extiline);
          }
          else
          {
            CLEAR_BIT(EXTI->FTSR1, extiline);
          }
  
          /* Clear COMP EXTI pending bit if any */
          WRITE_REG(EXTI->PR1, extiline);
  
          /* Enable EXTI event generation */
          SET_BIT(EXTI->EMR1, extiline);
        }
        else
        {
          /* Make sur EXTI event generation is disabled */
          CLEAR_BIT(EXTI->EMR1, extiline);
        }
  
        /* Enable the selected comparator */
        SET_BIT(hcomp->Instance->CSR, COMP_CSR_EN);
  
        hcomp->State = HAL_COMP_STATE_BUSY;
      }
      else
      {
        status = HAL_ERROR;
      }
    }
  
    return status;
  }
  
  /**
    * @brief  Stop the comparator.
    * @param  hcomp  COMP handle
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_COMP_Stop(COMP_HandleTypeDef *hcomp)
  { 
    HAL_StatusTypeDef status = HAL_OK;
    
    /* Check the COMP handle allocation and lock status */
    if((hcomp == NULL) || ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
    {
      status = HAL_ERROR;
    }
    else
    {
      /* Check the parameter */
      assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
  
      if(hcomp->State == HAL_COMP_STATE_BUSY)
      {
        /* Disable the EXTI Line event mode if any */
        CLEAR_BIT(EXTI->EMR1, COMP_GET_EXTI_LINE(hcomp->Instance));
  
        /* Disable the selected comparator */
        CLEAR_BIT(hcomp->Instance->CSR, COMP_CSR_EN);
  
        hcomp->State = HAL_COMP_STATE_READY;
      }
      else
      {
        status = HAL_ERROR;
      }
    }
    
    return status;
  }
  
  /**
    * @brief  Start the comparator in Interrupt mode.
    * @param  hcomp  COMP handle
    * @retval HAL status.
    */
  HAL_StatusTypeDef HAL_COMP_Start_IT(COMP_HandleTypeDef *hcomp)
  { 
    HAL_StatusTypeDef status = HAL_OK;
    uint32_t extiline = 0;
    
    /* Check the COMP handle allocation and lock status */
    if((hcomp == NULL) || ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
    {
      status = HAL_ERROR;
    }
    else
    {
      /* Check the parameter */
      assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
  
      if(hcomp->State == HAL_COMP_STATE_READY)
      {
        /* Configure the EXTI event generation */
        if((hcomp->Init.TriggerMode & (COMP_TRIGGERMODE_IT_RISING|COMP_TRIGGERMODE_IT_FALLING)) != RESET)
        {
          /* Get the EXTI Line output configuration */
          extiline = COMP_GET_EXTI_LINE(hcomp->Instance);
  
          /* Configure the trigger rising edge */
          if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_IT_RISING) != RESET)
          {
            SET_BIT(EXTI->RTSR1, extiline);
          }
          else
          {
            CLEAR_BIT(EXTI->RTSR1, extiline);
          }
          /* Configure the trigger falling edge */
          if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_IT_FALLING) != RESET)
          {
            SET_BIT(EXTI->FTSR1, extiline);
          }
          else
          {
            CLEAR_BIT(EXTI->FTSR1, extiline);
          }
  
          /* Clear COMP EXTI pending bit if any */
          WRITE_REG(EXTI->PR1, extiline);
  
          /* Enable EXTI interrupt mode */
          SET_BIT(EXTI->IMR1, extiline);
  
          /* Enable the selected comparator */
          SET_BIT(hcomp->Instance->CSR, COMP_CSR_EN);
  
          hcomp->State = HAL_COMP_STATE_BUSY;
        }
        else
        {
          status = HAL_ERROR;
        }
      }
      else
      {
        status = HAL_ERROR;
      }
    }
  
    return status;
  }
  
  /**
    * @brief  Stop the comparator in Interrupt mode.
    * @param  hcomp  COMP handle
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_COMP_Stop_IT(COMP_HandleTypeDef *hcomp)
  {
    HAL_StatusTypeDef status = HAL_OK;
    
    /* Disable the EXTI Line interrupt mode */
    CLEAR_BIT(EXTI->IMR1, COMP_GET_EXTI_LINE(hcomp->Instance));
    
    status = HAL_COMP_Stop(hcomp);
    
    return status;
  }
  
  /**
    * @brief  Comparator IRQ Handler.
    * @param  hcomp  COMP handle
    * @retval None
    */
  void HAL_COMP_IRQHandler(COMP_HandleTypeDef *hcomp)
  {
    uint32_t extiline = COMP_GET_EXTI_LINE(hcomp->Instance);
    
    /* Check COMP EXTI flag */
    if(READ_BIT(EXTI->PR1, extiline) != RESET)
    {
      /* Clear COMP EXTI pending bit */
      WRITE_REG(EXTI->PR1, extiline);
    
      /* COMP trigger user callback */
      HAL_COMP_TriggerCallback(hcomp);
    }
  }
  
  /**
    * @}
    */
  
  /** @defgroup COMP_Exported_Functions_Group3 Peripheral Control functions 
   *  @brief   Management functions.
   *
  @verbatim   
   ===============================================================================
                        ##### Peripheral Control functions #####
   ===============================================================================  
      [..]
      This subsection provides a set of functions allowing to control the comparators. 
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Lock the selected comparator configuration.
    * @note   A system reset is required to unlock the comparator configuration.
    * @note   Locking the comparator from its reset state is possible provided
    *         __HAL_RCC_SYSCFG_CLK_ENABLE() is being called before.
    * @param  hcomp  COMP handle
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_COMP_Lock(COMP_HandleTypeDef *hcomp)
  {
    HAL_StatusTypeDef status = HAL_OK;
  
    /* Check the COMP handle allocation and lock status */
    if((hcomp == NULL) || ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
    {
      status = HAL_ERROR;
    }
    else
    {
      /* Check the parameter */
      assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
  
      hcomp->State = ((HAL_COMP_StateTypeDef)(hcomp->State | COMP_STATE_BIT_LOCK));
    }
    
    if(status == HAL_OK)
    {
      /* Set the lock bit corresponding to selected comparator */
      __HAL_COMP_LOCK(hcomp);
    }
    
    return status; 
  }
  
  /**
    * @brief  Return the output level (high or low) of the selected comparator. 
    *         The output level depends on the selected polarity.
    *         If the polarity is not inverted:
    *           - Comparator output is low when the non-inverting input is at a lower
    *             voltage than the inverting input
    *           - Comparator output is high when the non-inverting input is at a higher
    *             voltage than the inverting input
    *         If the polarity is inverted:
    *           - Comparator output is high when the non-inverting input is at a lower
    *             voltage than the inverting input
    *           - Comparator output is low when the non-inverting input is at a higher
    *             voltage than the inverting input
    * @param  hcomp  COMP handle
    * @retval Returns the selected comparator output level: 
    *         @arg @ref COMP_OUTPUTLEVEL_LOW
    *         @arg @ref COMP_OUTPUTLEVEL_HIGH
    *       
    */
  uint32_t HAL_COMP_GetOutputLevel(COMP_HandleTypeDef *hcomp)
  {
    /* Check the parameter */
    assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
    
    return((uint32_t)(hcomp->Instance->CSR & COMP_OUTPUTLEVEL_HIGH));
  }
  
  /**
    * @brief  Comparator callback.
    * @param  hcomp  COMP handle
    * @retval None
    */
  __weak void HAL_COMP_TriggerCallback(COMP_HandleTypeDef *hcomp)
  {
    /* Prevent unused argument(s) compilation warning */
    UNUSED(hcomp);
  
    /* NOTE : This function should not be modified, when the callback is needed,
              the HAL_COMP_TriggerCallback should be implemented in the user file
     */
  }
  
  
  /**
    * @}
    */
  
  /** @defgroup COMP_Exported_Functions_Group4 Peripheral State functions 
   *  @brief   Peripheral State functions. 
   *
  @verbatim   
   ===============================================================================
                        ##### Peripheral State functions #####
   ===============================================================================  
      [..]
      This subsection permits to get in run-time the status of the peripheral.
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Return the COMP handle state.
    * @param  hcomp  COMP handle
    * @retval HAL state
    */
  HAL_COMP_StateTypeDef HAL_COMP_GetState(COMP_HandleTypeDef *hcomp)
  {
    /* Check the COMP handle allocation */
    if(hcomp == NULL)
    {
      return HAL_COMP_STATE_RESET;
    }
  
    /* Check the parameter */
    assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
  
    /* Return COMP handle state */
    return hcomp->State;
  }
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  #endif /* HAL_COMP_MODULE_ENABLED */
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  