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/**

  ******************************************************************************

  * @file    stm32f0xx_hal_comp.c

  * @author  MCD Application Team

  * @brief   COMP HAL module driver.

  *          This file provides firmware functions to manage the following

  *          functionalities of the COMP peripheral:

  *           + Initialization/de-initialization functions

  *           + I/O operation functions

  *           + Peripheral Control functions

  *           + Peripheral State functions

  *        

  @verbatim

================================================================================

          ##### COMP Peripheral features #####

================================================================================

  [..]      

      The STM32F0xx device family integrates up to 2 analog comparators COMP1 and COMP2:

      (+) The non inverting input and inverting input can be set to GPIO pins.

      (+) The COMP output is available using HAL_COMP_GetOutputLevel()

          and can be set on GPIO pins.

      (+) The COMP output can be redirected to embedded timers (TIM1, TIM2 and TIM3).

      (+) The comparators COMP1 and COMP2 can be combined in window mode.

      (+) The comparators 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 STM32F05x, STM32F07x and STM32F09x devices.

      To use the comparator, perform the following steps:

      (#) Fill in the HAL_COMP_MspInit() to

      (++) Configure the comparator input 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 output polarity  

      (++) Select the output redirection

      (++) Select the hysteresis level

      (++) Select the power mode

      (++) Select the event/interrupt mode

      (++) Select the window mode

      -@@- HAL_COMP_Init() calls internally __HAL_RCC_SYSCFG_CLK_ENABLE() in order

          to access the comparator(s) registers.

      (#) Enable the comparator using HAL_COMP_Start() function or HAL_COMP_Start_IT() function for interrupt mode.

      (#) Use HAL_COMP_TriggerCallback() and/or HAL_COMP_GetOutputLevel() functions

          to manage comparator outputs (event/interrupt triggered 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.

    *** Callback registration ***

    =============================================

    [..]

     The compilation flag USE_HAL_COMP_REGISTER_CALLBACKS, when set to 1,

     allows the user to configure dynamically the driver callbacks.

     Use Functions @ref HAL_COMP_RegisterCallback()

     to register an interrupt callback.

    [..]

     Function @ref HAL_COMP_RegisterCallback() allows to register following callbacks:

       (+) OperationCpltCallback : callback for End of operation.

       (+) ErrorCallback         : callback for error detection.

       (+) MspInitCallback       : callback for Msp Init.

       (+) MspDeInitCallback     : callback for Msp DeInit.

     This function takes as parameters the HAL peripheral handle, the Callback ID

     and a pointer to the user callback function.

    [..]

     Use function @ref HAL_COMP_UnRegisterCallback to reset a callback to the default

     weak function.

    [..]

     @ref HAL_COMP_UnRegisterCallback takes as parameters the HAL peripheral handle,

     and the Callback ID.

     This function allows to reset following callbacks:

       (+) OperationCpltCallback : callback for End of operation.

       (+) ErrorCallback         : callback for error detection.

       (+) MspInitCallback       : callback for Msp Init.

       (+) MspDeInitCallback     : callback for Msp DeInit.

     [..]

     By default, after the @ref HAL_COMP_Init() and when the state is @ref HAL_COMP_STATE_RESET

     all callbacks are set to the corresponding weak functions:

     examples @ref HAL_COMP_OperationCpltCallback(), @ref HAL_COMP_ErrorCallback().

     Exception done for MspInit and MspDeInit functions that are

     reset to the legacy weak functions in the @ref HAL_COMP_Init()/ @ref HAL_COMP_DeInit() only when

     these callbacks are null (not registered beforehand).

    [..]

     If MspInit or MspDeInit are not null, the @ref HAL_COMP_Init()/ @ref HAL_COMP_DeInit()

     keep and use the user MspInit/MspDeInit callbacks (registered beforehand) whatever the state.

     [..]

     Callbacks can be registered/unregistered in @ref HAL_COMP_STATE_READY state only.

     Exception done MspInit/MspDeInit functions that can be registered/unregistered

     in @ref HAL_COMP_STATE_READY or @ref HAL_COMP_STATE_RESET state,

     thus registered (user) MspInit/DeInit callbacks can be used during the Init/DeInit.

    [..]

     Then, the user first registers the MspInit/MspDeInit user callbacks

     using @ref HAL_COMP_RegisterCallback() before calling @ref HAL_COMP_DeInit()

     or @ref HAL_COMP_Init() function.

     [..]

     When the compilation flag USE_HAL_COMP_REGISTER_CALLBACKS is set to 0 or

     not defined, the callback registration feature is not available and all callbacks

     are set to the corresponding weak functions.

  @endverbatim

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; Copyright (c) 2016 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

  *

  ******************************************************************************

  */

/*

    Additional Tables:

    Table 1. COMP Inputs for the STM32F05x, STM32F07x and STM32F09x devices

    +--------------------------------------------------+    

    |                 |                | COMP1 | COMP2 |

    |-----------------|----------------|---------------|

    |                 | 1/4 VREFINT    |  OK   |  OK   |

    |                 | 1/2 VREFINT    |  OK   |  OK   |

    |                 | 3/4 VREFINT    |  OK   |  OK   |

    | Inverting Input | VREFINT        |  OK   |  OK   |

    |                 | DAC1 OUT (PA4) |  OK   |  OK   |

    |                 | DAC2 OUT (PA5) |  OK   |  OK   |

    |                 | IO1            |  PA0  |  PA2  |

    |-----------------|----------------|-------|-------|

    |  Non Inverting  |                |  PA1  |  PA3  |

    |    Input        |                |       |       |

    +--------------------------------------------------+  

    Table 2. COMP Outputs for the STM32F05x, STM32F07x and STM32F09x devices

    +---------------+    

    | COMP1 | COMP2 |

    |-------|-------|

    |  PA0  |  PA2  |

    |  PA6  |  PA7  |

    |  PA11 |  PA12 |

    +---------------+

    Table 3. COMP Outputs redirection to embedded timers for the STM32F05x, STM32F07x and STM32F09x devices

    +---------------------------------+    

    |     COMP1      |     COMP2      |

    |----------------|----------------|

    |  TIM1 BKIN     |  TIM1 BKIN     |

    |                |                |

    |  TIM1 OCREFCLR |  TIM1 OCREFCLR |

    |                |                |

    |  TIM1 IC1      |  TIM1 IC1      |

    |                |                |

    |  TIM2 IC4      |  TIM2 IC4      |

    |                |                |

    |  TIM2 OCREFCLR |  TIM2 OCREFCLR |

    |                |                |

    |  TIM3 IC1      |  TIM3 IC1      |

    |                |                |

    |  TIM3 OCREFCLR |  TIM3 OCREFCLR |

    +---------------------------------+

*/

/* Includes ------------------------------------------------------------------*/

#include "stm32f0xx_hal.h"

#ifdef HAL_COMP_MODULE_ENABLED

#if defined (COMP1) || defined (COMP2)

/** @addtogroup STM32F0xx_HAL_Driver

  * @{

  */

/** @defgroup COMP COMP

  * @brief COMP HAL module driver

  * @{

  */

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/** @defgroup COMP_Private_Constants COMP Private Constants

  * @{

  */

/* Delay for COMP startup time.                                               */

/* Note: Delay required to reach propagation delay specification.             */

/* Literal set to maximum value (refer to device datasheet,                   */

/* parameter "tSTART").                                                       */

/* Unit: us                                                                   */

#define COMP_DELAY_STARTUP_US           (60U)  /*!< Delay for COMP startup time */

/* CSR register reset value */

#define COMP_CSR_RESET_VALUE            (0x00000000U)

/* CSR register masks */

#define COMP_CSR_RESET_PARAMETERS_MASK   (0x00003FFFU)

#define COMP_CSR_UPDATE_PARAMETERS_MASK  (0x00003FFEU)

/* CSR COMPx non inverting input mask */

#define COMP_CSR_COMPxNONINSEL_MASK      ((uint16_t)COMP_CSR_COMP1SW1)

/* CSR COMP2 shift */

#define COMP_CSR_COMP1_SHIFT             0U

#define COMP_CSR_COMP2_SHIFT             16U

/**

  * @}

  */

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/

/** @defgroup COMP_Exported_Functions COMP Exported Functions

  * @{

  */

/** @defgroup COMP_Exported_Functions_Group1 Initialization/de-initialization functions

 *  @brief    Initialization and Configuration functions

 *

@verbatim    

 ===============================================================================

              ##### Initialization and Configuration functions #####

 ===============================================================================

    [..]  This section provides functions to initialize and de-initialize comparators

@endverbatim

  * @{

  */

/**

  * @brief  Initializes the COMP according to the specified

  *         parameters in the COMP_InitTypeDef and create 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)

{

  HAL_StatusTypeDef status = HAL_OK;

  uint32_t regshift = COMP_CSR_COMP1_SHIFT;

  /* 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));

    assert_param(IS_COMP_INVERTINGINPUT(hcomp->Init.InvertingInput));

    assert_param(IS_COMP_NONINVERTINGINPUT(hcomp->Init.NonInvertingInput));

    assert_param(IS_COMP_OUTPUT(hcomp->Init.Output));

    assert_param(IS_COMP_OUTPUTPOL(hcomp->Init.OutputPol));

    assert_param(IS_COMP_HYSTERESIS(hcomp->Init.Hysteresis));

    assert_param(IS_COMP_MODE(hcomp->Init.Mode));

    if(hcomp->Init.NonInvertingInput == COMP_NONINVERTINGINPUT_DAC1SWITCHCLOSED)

    {

      assert_param(IS_COMP_DAC1SWITCH_INSTANCE(hcomp->Instance));

    }

    if(hcomp->Init.WindowMode != COMP_WINDOWMODE_DISABLE)

    {

      assert_param(IS_COMP_WINDOWMODE_INSTANCE(hcomp->Instance));

    }

    /* Init SYSCFG and the low level hardware to access comparators */

    __HAL_RCC_SYSCFG_CLK_ENABLE();  

#if (USE_HAL_COMP_REGISTER_CALLBACKS == 1)

    /* Init the COMP Callback settings */

    hcomp->TriggerCallback = HAL_COMP_TriggerCallback; /* Legacy weak callback */

    if (hcomp->MspInitCallback == NULL)

    {

      hcomp->MspInitCallback = HAL_COMP_MspInit; /* Legacy weak MspInit  */

    }

    /* Init the low level hardware */

    hcomp->MspInitCallback(hcomp);

#else

    /* Init the low level hardware : SYSCFG to access comparators */

    HAL_COMP_MspInit(hcomp);

#endif /* USE_HAL_COMP_REGISTER_CALLBACKS */

    if(hcomp->State == HAL_COMP_STATE_RESET)

    {

      /* Allocate lock resource and initialize it */

      hcomp->Lock = HAL_UNLOCKED;

    }

    /* Change COMP peripheral state */

    hcomp->State = HAL_COMP_STATE_BUSY;

    /* Set COMP parameters */

    /*     Set COMPxINSEL bits according to hcomp->Init.InvertingInput value        */

    /*     Set COMPxOUTSEL bits according to hcomp->Init.Output value               */

    /*     Set COMPxPOL bit according to hcomp->Init.OutputPol value                */

    /*     Set COMPxHYST bits according to hcomp->Init.Hysteresis value             */

    /*     Set COMPxMODE bits according to hcomp->Init.Mode value                   */

    if(hcomp->Instance == COMP2)

    {

      regshift = COMP_CSR_COMP2_SHIFT;

    }

    MODIFY_REG(COMP->CSR,

               (COMP_CSR_COMPxINSEL  | COMP_CSR_COMPxNONINSEL_MASK | \

                COMP_CSR_COMPxOUTSEL | COMP_CSR_COMPxPOL           | \

                COMP_CSR_COMPxHYST   | COMP_CSR_COMPxMODE) << regshift,

               (hcomp->Init.InvertingInput    | \

                hcomp->Init.NonInvertingInput | \

                hcomp->Init.Output            | \

                hcomp->Init.OutputPol         | \

                hcomp->Init.Hysteresis        | \

                hcomp->Init.Mode) << regshift);  

    if(hcomp->Init.WindowMode != COMP_WINDOWMODE_DISABLE)

    {

      COMP->CSR |= COMP_CSR_WNDWEN;

    }

    /* Initialize the COMP state*/

    hcomp->State = HAL_COMP_STATE_READY;

  }

  return status;

}

/**

  * @brief  DeInitializes the COMP peripheral

  * @note   Deinitialization can't 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;

  uint32_t regshift = COMP_CSR_COMP1_SHIFT;

  /* 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 for the corresponding COMP instance */

    if(hcomp->Instance == COMP2)

    {

      regshift = COMP_CSR_COMP2_SHIFT;

    }

    MODIFY_REG(COMP->CSR,

               COMP_CSR_RESET_PARAMETERS_MASK << regshift,

               COMP_CSR_RESET_VALUE << regshift);

#if (USE_HAL_COMP_REGISTER_CALLBACKS == 1)

    if (hcomp->MspDeInitCallback == NULL)

    {

      hcomp->MspDeInitCallback = HAL_COMP_MspDeInit; /* Legacy weak MspDeInit  */

    }

    /* DeInit the low level hardware: SYSCFG, GPIO, CLOCK and NVIC */

    hcomp->MspDeInitCallback(hcomp);

#else

    /* DeInit the low level hardware: SYSCFG, GPIO, CLOCK and NVIC */

    HAL_COMP_MspDeInit(hcomp);

#endif /* USE_HAL_COMP_REGISTER_CALLBACKS */

    hcomp->State = HAL_COMP_STATE_RESET;

    /* Release Lock */

    __HAL_UNLOCK(hcomp);

  }

  return status;

}

/**

  * @brief  Initializes 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 implenetd in the user file

   */

}

/**

  * @brief  DeInitializes 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 implenetd in the user file

   */

}

#if (USE_HAL_COMP_REGISTER_CALLBACKS == 1)

/**

  * @brief  Register a User COMP Callback

  *         To be used instead of the weak predefined callback

  * @param  hcomp Pointer to a COMP_HandleTypeDef structure that contains

  *                the configuration information for the specified COMP.

  * @param  CallbackID ID of the callback to be registered

  *         This parameter can be one of the following values:

  *          @arg @ref HAL_COMP_TRIGGER_CB_ID Trigger callback ID

  *          @arg @ref HAL_COMP_MSPINIT_CB_ID MspInit callback ID

  *          @arg @ref HAL_COMP_MSPDEINIT_CB_ID MspDeInit callback ID

  * @param  pCallback pointer to the Callback function

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_COMP_RegisterCallback(COMP_HandleTypeDef *hcomp, HAL_COMP_CallbackIDTypeDef CallbackID, pCOMP_CallbackTypeDef pCallback)

{

  HAL_StatusTypeDef status = HAL_OK;

  if (pCallback == NULL)

  {

    /* Update the error code */

    hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

    return HAL_ERROR;

  }

  if (HAL_COMP_STATE_READY == hcomp->State)

  {

    switch (CallbackID)

    {

    case HAL_COMP_TRIGGER_CB_ID :

      hcomp->TriggerCallback = pCallback;

      break;

    case HAL_COMP_MSPINIT_CB_ID :

      hcomp->MspInitCallback = pCallback;

      break;

    case HAL_COMP_MSPDEINIT_CB_ID :

      hcomp->MspDeInitCallback = pCallback;

      break;

    default :

      /* Update the error code */

      hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

      /* Return error status */

      status = HAL_ERROR;

      break;

    }

  }

  else if (HAL_COMP_STATE_RESET == hcomp->State)

  {

    switch (CallbackID)

    {

    case HAL_COMP_MSPINIT_CB_ID :

      hcomp->MspInitCallback = pCallback;

      break;

    case HAL_COMP_MSPDEINIT_CB_ID :

      hcomp->MspDeInitCallback = pCallback;

      break;

    default :

      /* Update the error code */

      hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

      /* Return error status */

      status = HAL_ERROR;

      break;

    }

  }

  else

  {

    /* Update the error code */

    hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

    /* Return error status */

    status =  HAL_ERROR;

  }

  return status;

}

/**

  * @brief  Unregister a COMP Callback

  *         COMP callback is redirected to the weak predefined callback

  * @param  hcomp Pointer to a COMP_HandleTypeDef structure that contains

  *                the configuration information for the specified COMP.

  * @param  CallbackID ID of the callback to be unregistered

  *         This parameter can be one of the following values:

  *          @arg @ref HAL_COMP_TRIGGER_CB_ID Trigger callback ID

  *          @arg @ref HAL_COMP_MSPINIT_CB_ID MspInit callback ID

  *          @arg @ref HAL_COMP_MSPDEINIT_CB_ID MspDeInit callback ID

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_COMP_UnRegisterCallback(COMP_HandleTypeDef *hcomp, HAL_COMP_CallbackIDTypeDef CallbackID)

{

  HAL_StatusTypeDef status = HAL_OK;

  if (HAL_COMP_STATE_READY == hcomp->State)

  {

    switch (CallbackID)

    {

    case HAL_COMP_TRIGGER_CB_ID :

      hcomp->TriggerCallback = HAL_COMP_TriggerCallback;         /* Legacy weak callback */

      break;

    case HAL_COMP_MSPINIT_CB_ID :

      hcomp->MspInitCallback = HAL_COMP_MspInit;                 /* Legacy weak MspInit */

      break;

    case HAL_COMP_MSPDEINIT_CB_ID :

      hcomp->MspDeInitCallback = HAL_COMP_MspDeInit;             /* Legacy weak MspDeInit */

      break;

    default :

      /* Update the error code */

      hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

      /* Return error status */

      status =  HAL_ERROR;

      break;

    }

  }

  else if (HAL_COMP_STATE_RESET == hcomp->State)

  {

    switch (CallbackID)

    {

    case HAL_COMP_MSPINIT_CB_ID :

      hcomp->MspInitCallback = HAL_COMP_MspInit;                 /* Legacy weak MspInit */

      break;

    case HAL_COMP_MSPDEINIT_CB_ID :

      hcomp->MspDeInitCallback = HAL_COMP_MspDeInit;             /* Legacy weak MspDeInit */

      break;

    default :

      /* Update the error code */

      hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

      /* Return error status */

      status =  HAL_ERROR;

      break;

    }

  }

  else

  {

    /* Update the error code */

    hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

    /* Return error status */

    status =  HAL_ERROR;

  }

  return status;

}

#endif /* USE_HAL_COMP_REGISTER_CALLBACKS */

/**

  * @}

  */

/** @defgroup COMP_Exported_Functions_Group2 I/O operation functions

 *  @brief   Data transfers functions

 *

@verbatim  

 ===============================================================================

                      ##### IO operation functions #####

 ===============================================================================  

    [..]

    This subsection provides a set of functions allowing to manage the COMP data

    transfers.

@endverbatim

  * @{

  */

/**

  * @brief  Start the comparator

  * @param  hcomp COMP handle

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_COMP_Start(COMP_HandleTypeDef *hcomp)

{

  uint32_t wait_loop_index = 0U;

  HAL_StatusTypeDef status = HAL_OK;

  uint32_t regshift = COMP_CSR_COMP1_SHIFT;

  /* 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)

    {

      /* Enable the selected comparator */

      if(hcomp->Instance == COMP2)

      {

        regshift = COMP_CSR_COMP2_SHIFT;

      }

      SET_BIT(COMP->CSR, COMP_CSR_COMPxEN << regshift);

      /* Set HAL COMP handle state */

      hcomp->State = HAL_COMP_STATE_BUSY;

      /* Delay for COMP startup time */

      wait_loop_index = (COMP_DELAY_STARTUP_US * (SystemCoreClock / 1000000U));

      while(wait_loop_index != 0U)

      {

        wait_loop_index--;

      }    

    }

    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;

  uint32_t regshift = COMP_CSR_COMP1_SHIFT;

  /* 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 selected comparator */

      if(hcomp->Instance == COMP2)

      {

        regshift = COMP_CSR_COMP2_SHIFT;

      }

      CLEAR_BIT(COMP->CSR, COMP_CSR_COMPxEN << regshift);

      hcomp->State = HAL_COMP_STATE_READY;

    }

    else

    {

      status = HAL_ERROR;

    }

  }

  return status;

}

/**

  * @brief  Enables the interrupt and starts the comparator

  * @param  hcomp COMP handle

  * @retval HAL status.

  */

HAL_StatusTypeDef HAL_COMP_Start_IT(COMP_HandleTypeDef *hcomp)

{

  HAL_StatusTypeDef status = HAL_OK;

  uint32_t extiline = 0U;

  /* Check the parameter */

  assert_param(IS_COMP_TRIGGERMODE(hcomp->Init.TriggerMode));

  status = HAL_COMP_Start(hcomp);

  if(status == HAL_OK)

  {

    /* Check the Exti Line output configuration */

    extiline = COMP_GET_EXTI_LINE(hcomp->Instance);

    /* Configure the rising edge */

    if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_IT_RISING) != RESET)

    {

      SET_BIT(EXTI->RTSR, extiline);

    }

    else

    {

      CLEAR_BIT(EXTI->RTSR, extiline);

    }

    /* Configure the falling edge */

    if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_IT_FALLING) != RESET)

    {

      SET_BIT(EXTI->FTSR, extiline);

    }

    else

    {

      CLEAR_BIT(EXTI->FTSR, extiline);

    }

    /* Clear COMP EXTI pending bit */

    WRITE_REG(EXTI->PR, extiline);

    /* Enable Exti interrupt mode */

    SET_BIT(EXTI->IMR, extiline);

  }

  return status;

}

/**

  * @brief  Disable the interrupt and Stop the comparator

  * @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->IMR, COMP_GET_EXTI_LINE(hcomp->Instance));

  status = HAL_COMP_Stop(hcomp);

  return status;

}

/**

  * @brief  Comparator IRQ Handler

  * @param  hcomp COMP handle

  * @retval HAL status

  */

void HAL_COMP_IRQHandler(COMP_HandleTypeDef *hcomp)

{

  uint32_t extiline = COMP_GET_EXTI_LINE(hcomp->Instance);

  /* Check COMP Exti flag */

  if(READ_BIT(EXTI->PR, extiline) != RESET)

  {

    /* Clear COMP Exti pending bit */

    WRITE_REG(EXTI->PR, extiline);

    /* COMP trigger callback */

#if (USE_HAL_COMP_REGISTER_CALLBACKS == 1)

    hcomp->TriggerCallback(hcomp);

#else

    HAL_COMP_TriggerCallback(hcomp);

#endif /* USE_HAL_COMP_REGISTER_CALLBACKS */  

  }

}

/**

  * @}

  */

/** @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 COMP data

    transfers.

@endverbatim

  * @{

  */

/**

  * @brief  Lock the selected comparator configuration.

  * @param  hcomp COMP handle

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_COMP_Lock(COMP_HandleTypeDef *hcomp)

{

  HAL_StatusTypeDef status = HAL_OK;

  uint32_t regshift = COMP_CSR_COMP1_SHIFT;

  /* 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 lock flag */

    hcomp->State |= COMP_STATE_BIT_LOCK;

    /* Set the lock bit corresponding to selected comparator */

    if(hcomp->Instance == COMP2)

    {

      regshift = COMP_CSR_COMP2_SHIFT;

    }

    SET_BIT(COMP->CSR, COMP_CSR_COMPxLOCK << regshift);

  }

  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: COMP_OUTPUTLEVEL_LOW or COMP_OUTPUTLEVEL_HIGH.

  *      

  */

uint32_t HAL_COMP_GetOutputLevel(COMP_HandleTypeDef *hcomp)

{

  uint32_t level=0;

  uint32_t regshift = COMP_CSR_COMP1_SHIFT;

  /* Check the parameter */

  assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));

  if(hcomp->Instance == COMP2)

  {

    regshift = COMP_CSR_COMP2_SHIFT;

  }

  level = READ_BIT(COMP->CSR, COMP_CSR_COMPxOUT << regshift);

  if(level != 0U)

  {

    return(COMP_OUTPUTLEVEL_HIGH);

  }

  return(COMP_OUTPUTLEVEL_LOW);

}

/**

  * @brief  Comparator trigger 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 permit to get in run-time the status of the peripheral

    and the data flow.

@endverbatim

  * @{