V9_PMU302_Bootloader/Drivers/STM32F3xx_HAL_Driver/Src/stm32f3xx_hal_comp.c

/**
  ******************************************************************************
  * @file    stm32f3xx_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 and de-initialization functions
  *           + Peripheral Control functions
  *           + Peripheral State functions
  *
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  @verbatim
================================================================================
          ##### COMP Peripheral features #####
================================================================================

  [..]
      The STM32F3xx device family integrates up to 7 analog comparators COMP1, COMP2...COMP7:
      (#) The non inverting input and inverting input can be set to GPIO pins.
          For STM32F3xx devices please refer to the COMP peripheral section in corresponding
          Reference Manual.

      (#) The COMP output is available using HAL_COMP_GetOutputLevel()
          and can be set on GPIO pins.
          For STM32F3xx devices please refer to the COMP peripheral section in corresponding
          Reference Manual.

      (#) The COMP output can be redirected to embedded timers (TIM1, TIM2, TIM3...).
          For STM32F3xx devices please refer to the COMP peripheral section in corresponding
          Reference Manual.

      (#) Each couple of comparators COMP1 and COMP2, COMP3 and COMP4, COMP5 and COMP6 can be combined in window
          mode and respectively COMP1, COMP3 and COMP5 non inverting input is used as common non-inverting input.

      (#) The seven 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
          (++) COMP3 is internally connected to EXTI Line 29
          (++) COMP4 is internally connected to EXTI Line 30
          (++) COMP5 is internally connected to EXTI Line 31
          (++) COMP6 is internally connected to EXTI Line 32
          (++) COMP7 is internally connected to EXTI Line 33.

          From the corresponding IRQ handler, the right interrupt source can be retrieved with the
          adequate macro __HAL_COMP_COMPx_EXTI_GET_FLAG().


            ##### How to use this driver #####
================================================================================
  [..]
      This driver provides functions to configure and program the Comparators of all STM32F3xx 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 (EXTI line 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_SetPriority() and HAL_NVIC_EnableIRQ() functions.

      (#) 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

      -@@- 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.

    *** 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 HAL_COMP_RegisterCallback()
     to register an interrupt callback.
    [..]

     Function 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 HAL_COMP_UnRegisterCallback to reset a callback to the default
     weak function.
    [..]

     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 HAL_COMP_Init() and when the state is HAL_COMP_STATE_RESET
     all callbacks are set to the corresponding weak functions:
     examples HAL_COMP_OperationCpltCallback(), HAL_COMP_ErrorCallback().
     Exception done for MspInit and MspDeInit functions that are
     reset to the legacy weak functions in the HAL_COMP_Init()/ HAL_COMP_DeInit() only when
     these callbacks are null (not registered beforehand).
    [..]

     If MspInit or MspDeInit are not null, the HAL_COMP_Init()/ HAL_COMP_DeInit()
     keep and use the user MspInit/MspDeInit callbacks (registered beforehand) whatever the state.
     [..]

     Callbacks can be registered/unregistered in HAL_COMP_STATE_READY state only.
     Exception done MspInit/MspDeInit functions that can be registered/unregistered
     in HAL_COMP_STATE_READY or 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 HAL_COMP_RegisterCallback() before calling HAL_COMP_DeInit()
     or 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.

  ******************************************************************************
  */

/*
  Additional Tables:

    Table 1. COMP Inputs for the STM32F303xB/STM32F303xC/STM32F303xE devices
    +------------------------------------------------------------------------------------------+
    |                 |                | COMP1 | COMP2 | COMP3 | COMP4 | COMP5 | COMP6 | COMP7 |
    |-----------------|----------------|---------------|---------------------------------------|
    |                 | 1U/4 VREFINT    |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |
    |                 | 1U/2 VREFINT    |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |
    |                 | 3U/4 VREFINT    |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |
    | Inverting Input | VREFINT        |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |
    |                 | DAC1 OUT (PA4) |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |
    |                 | DAC2 OUT (PA5) |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |  OK   |
    |                 | IO1            |  PA0  |  PA2  |  PD15U |  PE8  |  PD13U |  PD10U |  PC0  |
    |                 | IO2            |  ---  |  ---  |  PB12U |  PB2  |  PB10U |  PB15U |  ---  |
    |-----------------|----------------|-------|-------|-------|-------|-------|-------|-------|
    |  Non Inverting  | IO1            |  PA1  |  PA7  |  PB14U |  PB0  |  PD12U |  PD11U |  PA0  |
    |    Input        | IO2            |  ---  |  PA3  |  PD14U |  PE7  |  PB13U |  PB11U |  PC1  |
    +------------------------------------------------------------------------------------------+

    Table 2. COMP Outputs for the STM32F303xB/STM32F303xC/STM32F303xE devices
    +-------------------------------------------------------+
    | COMP1 | COMP2 | COMP3 | COMP4 | COMP5 | COMP6 | COMP7 |
    |-------|-------|-------|-------|-------|-------|-------|
    |  PA0  |  PA2  |  PB1  |  PC8  |  PC7  |  PA10U |  PC2  |
    |  PF4  |  PA7  |  ---  |  PA8  |  PA9  |  PC6  |  ---  |
    |  PA6  |  PA12U |  ---  |  ---  |  ---  |  ---  |  ---  |
    |  PA11U |  PB9  |  ---  |  ---  |  ---  |  ---  |  ---  |
    |  PB8  |  ---  |  ---  |  ---  |  ---  |  ---  |  ---  |
    +-------------------------------------------------------+

    Table 3. COMP Outputs redirection to embedded timers for the STM32F303xB/STM32F303xC devices
    +----------------------------------------------------------------------------------------------------------------------+
    |     COMP1      |     COMP2      |     COMP3      |     COMP4      |     COMP5      |     COMP6      |     COMP7      |
    |----------------|----------------|----------------|----------------|----------------|----------------|----------------|
    |  TIM1 BKIN     |  TIM1 BKIN     |  TIM1 BKIN     |  TIM1 BKIN     |  TIM1 BKIN     |  TIM1 BKIN     |  TIM1 BKIN     |
    |                |                |                |                |                |                |                |
    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |
    |                |                |                |                |                |                |                |
    |  TIM8 BKIN     |  TIM8 BKIN     |  TIM8 BKIN     |  TIM8 BKIN     |  TIM8 BKIN     |  TIM8 BKIN     |  TIM8 BKIN     |
    |                |                |                |                |                |                |                |
    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |
    |                |                |                |                |                |                |                |
    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |
    |     +          |     +          |     +          |     +          |     +          |     +          |     +          |
    |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |
    |                |                |                |                |                |                |                |
    |  TIM1 OCREFCLR |  TIM1 OCREFCLR |  TIM1 OCREFCLR |  TIM8 OCREFCLR |  TIM8 OCREFCLR |  TIM8 OCREFCLR |  TIM1 OCREFCLR |
    |                |                |                |                |                |                |                |
    |  TIM1 IC1      |  TIM1 IC1      |  TIM2 OCREFCLR |  TIM3 IC3      |  TIM2 IC1      |  TIM2 IC2      |  TIM8 OCREFCLR |
    |                |                |                |                |                |                |                |
    |  TIM2 IC4      |  TIM2 IC4      |  TIM3 IC2      |  TIM3 OCREFCLR |  TIM3 OCREFCLR |  TIM2 OCREFCLR |  TIM2 IC3      |
    |                |                |                |                |                |                |                |
    |  TIM2 OCREFCLR |  TIM2 OCREFCLR |  TIM4 IC1      |  TIM4 IC2      |  TIM4 IC3      |  TIM16 OCREFCLR|  TIM1 IC2      |
    |                |                |                |                |                |                |                |
    |  TIM3 IC1      |  TIM3 IC1      |  TIM15 IC1     |  TIM15 OCREFCLR|  TIM16 BKIN    |  TIM16 IC1     |  TIM17 OCREFCLR|
    |                |                |                |                |                |                |                |
    |  TIM3 OCREFCLR |  TIM3 OCREFCLR |  TIM15 BKIN    |  TIM15 IC2     |  TIM17 IC1     |  TIM4 IC4      |  TIM17 BKIN    |
    +----------------------------------------------------------------------------------------------------------------------+

    Table 4. COMP Outputs redirection to embedded timers for the STM32F303xE devices
    +----------------------------------------------------------------------------------------------------------------------+
    |     COMP1      |     COMP2      |     COMP3      |     COMP4      |     COMP5      |     COMP6      |     COMP7      |
    |----------------|----------------|----------------|----------------|----------------|----------------|----------------|
    |  TIM1 BKIN     |  TIM1 BKIN     |  TIM1 BKIN     |  TIM1 BKIN (1U) |  TIM1 BKIN     |  TIM1 BKIN     |  TIM1 BKIN (1U) |
    |                |                |                |                |                |                |                |
    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |
    |                |                |                |                |                |                |                |
    |  TIM8 BKIN     |  TIM8 BKIN     |  TIM8 BKIN     |  TIM8 BKIN (1U) |  TIM8 BKIN     |  TIM8 BKIN     |  TIM8 BKIN (1U) |
    |                |                |                |                |                |                |                |
    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |
    |                |                |                |                |                |                |                |
    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |
    |     +          |     +          |     +          |     +          |     +          |     +          |     +          |
    |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |  TIM8BKIN2     |
    |                |                |                |                |                |                |                |
    |  TIM1 OCREFCLR |  TIM1 OCREFCLR |  TIM1 OCREFCLR |  TIM8 OCREFCLR |  TIM8 OCREFCLR |  TIM8 OCREFCLR |  TIM1 OCREFCLR |
    |                |                |                |                |                |                |                |
    |  TIM1 IC1      |  TIM1 IC1      |  TIM2 OCREFCLR |  TIM3 IC3      |  TIM2 IC1      |  TIM2 IC2      |  TIM8 OCREFCLR |
    |                |                |                |                |                |                |                |
    |  TIM2 IC4      |  TIM2 IC4      |  TIM3 IC2      |  TIM3 OCREFCLR |  TIM3 OCREFCLR |  TIM2 OCREFCLR |  TIM2 IC3      |
    |                |                |                |                |                |                |                |
    |  TIM2 OCREFCLR |  TIM2 OCREFCLR |  TIM4 IC1      |  TIM4 IC2      |  TIM4 IC3      |  TIM16 OCREFCLR|  TIM1 IC2      |
    |                |                |                |                |                |                |                |
    |  TIM3 IC1      |  TIM3 IC1      |  TIM15 IC1     |  TIM15 OCREFCLR|  TIM16 BKIN    |  TIM16 IC1     |  TIM17 OCREFCLR|
    |                |                |                |                |                |                |                |
    |  TIM3 OCREFCLR |  TIM3 OCREFCLR |  TIM15 BKIN    |  TIM15 IC2     |  TIM17 IC1     |  TIM4 IC4      |  TIM17 BKIN    |
    |                |                |                |                |                |                |                |
    |  TIM20 BKIN    |  TIM20 BKIN    |  TIM20 BKIN    |  TIM20 BKIN (1U)|  TIM20 BKIN    |  TIM20 BKIN    |  TIM20 BKIN (1U)|
    |                |                |                |                |                |                |                |
    |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |
    |                |                |                |                |                |                |                |
    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |  TIM1 BKIN2    |
    |     +          |     +          |     +          |     +          |     +          |     +          |     +          |
    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |  TIM8 BKIN2    |
    |     +          |     +          |     +          |     +          |     +          |     +          |     +          |
    |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |  TIM20 BKIN2   |
    |                |                |                |                |                |                |                |
    +----------------------------------------------------------------------------------------------------------------------+
    (1U):  This connection consists of connecting both GPIO and COMP output to TIM1/8U/20 BRK input through an OR gate, instead
          of connecting the GPIO to the TIM1/8U/20 BRK input and the COMP output to the TIM1/8U/20 BRK_ACTH input. The aim is to
          add a digital filter (3  bits) on the COMP output.

    Table 5. COMP Outputs blanking sources for the STM32F303xB/STM32F303xC/STM32F303xE devices
    +----------------------------------------------------------------------------------------------------------------------+
    |     COMP1      |     COMP2      |     COMP3      |     COMP4      |     COMP5      |     COMP6      |     COMP7      |
    |----------------|----------------|----------------|----------------|----------------|----------------|----------------|
    |  TIM1 OC5      |  TIM1 OC5      |  TIM1 OC5      |  TIM3 OC4      |  --------      |  TIM8 OC5      |  TIM1 OC5      |
    |                |                |                |                |                |                |                |
    |  TIM2 OC3      |  TIM2 OC3      |  --------      |  TIM8 OC5      |  TIM3 OC3      |  TIM2 OC4      |  TIM8 OC5      |
    |                |                |                |                |                |                |                |
    |  TIM3 OC3      |  TIM3 OC3      |  TIM2 OC4      |  TIM15 OC1     |  TIM8 OC5      |  TIM15 OC2     |  TIM15 OC2     |
    |                |                |                |                |                |                |                |
    +----------------------------------------------------------------------------------------------------------------------+

*/

/* Includes ------------------------------------------------------------------*/
#include "stm32f3xx_hal.h"

/** @addtogroup STM32F3xx_HAL_Driver
  * @{
  */

/** @defgroup COMP COMP
  * @brief COMP HAL module driver
  * @{
  */

#ifdef HAL_COMP_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @defgroup COMP_Private_Constants COMP Private Constants
  * @{
  */
#define COMP_LOCK_DISABLE                      (0x00000000U)
#define COMP_LOCK_ENABLE                       COMP_CSR_COMPxLOCK

/* 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          (80UL)      /*!< Delay for COMP startup time */

/* Delay for COMP voltage scaler stabilization time.                          */
/* Literal set to maximum value (refer to device datasheet,                   */
/* parameter "tSTART_SCALER").                                                */
/* Unit: us                                                                   */
#define COMP_DELAY_VOLTAGE_SCALER_STAB_US (200UL)  /*!< Delay for COMP voltage scaler stabilization time */

/**
  * @}
  */

/* 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 peripheral according to the specified
  *         parameters in the COMP_InitTypeDef and initialize the associated handle.
  * @note   If the selected comparator is locked, initialization cannot 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 comp_voltage_scaler_initialized; /* Value "0" if comparator voltage scaler is not initialized */
  __IO uint32_t wait_loop_index = 0UL;
  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_NONINVERTINGINPUT_INSTANCE(hcomp->Instance, hcomp->Init.NonInvertingInput));
    assert_param(IS_COMP_OUTPUT(hcomp->Init.Output));
    assert_param(IS_COMP_OUTPUT_INSTANCE(hcomp->Instance, 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));
    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();

#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 */

    /* Memorize voltage scaler state before initialization */
    comp_voltage_scaler_initialized = READ_BIT(hcomp->Instance->CSR, (COMP_CSR_COMPxINSEL_1 | COMP_CSR_COMPxINSEL_0));

    if (hcomp->State == HAL_COMP_STATE_RESET)
    {
      /* Allocate lock resource and initialize it */
      hcomp->Lock = HAL_UNLOCKED;
    }

    /* Manage inverting input comparator inverting input connected to a GPIO  */
    /* for STM32F302x, STM32F32xx, STM32F33x.                                 */
    hcomp->Init.InvertingInput = COMP_INVERTINGINPUT_SELECTION(hcomp->Instance, hcomp->Init.InvertingInput);

    /* Set COMP parameters */
    /*     Set COMPxINSEL bits according to hcomp->Init.InvertingInput value        */
    /*     Set COMPxNONINSEL bits according to hcomp->Init.NonInvertingInput value  */
    /*     Set COMPxBLANKING bits according to hcomp->Init.BlankingSrce 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                   */
    COMP_INIT(hcomp);

    /* Delay for COMP scaler bridge voltage stabilization */
    /* Apply the delay if voltage scaler bridge is required and not already enabled */
    if ((READ_BIT(hcomp->Instance->CSR, (COMP_CSR_COMPxINSEL_1 | COMP_CSR_COMPxINSEL_0)) != 0UL) &&
        (comp_voltage_scaler_initialized == 0UL))
    {
      /* Wait loop initialization and execution */
      /* Note: Variable divided by 2 to compensate partially              */
      /*       CPU processing cycles, scaling in us split to not          */
      /*       exceed 32 bits register capacity and handle low frequency. */
      wait_loop_index = ((COMP_DELAY_VOLTAGE_SCALER_STAB_US / 10UL) * ((SystemCoreClock / (100000UL * 2UL)) + 1UL));
      while (wait_loop_index != 0UL)
      {
        wait_loop_index--;
      }
    }

    /* Initialize the COMP state*/
    hcomp->State = HAL_COMP_STATE_READY;
  }

  return status;
}

/**
  * @brief  DeInitialize the COMP peripheral.
  * @note   If the selected comparator is locked, deinitialization cannot be performed.
  *         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 */
    COMP_DEINIT(hcomp);

#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  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
   */
}

#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 Start Stop operation functions
 *  @brief   Start-Stop operation functions.
 *
@verbatim
 ===============================================================================
                      ##### Start Stop operation functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Start a comparator without interrupt generation.
      (+) Stop a comparator without interrupt generation.
      (+) Start a comparator with interrupt generation.
      (+) Stop a comparator with interrupt generation.
      (+) Handle interrupts from a comparator with associated callback function.

@endverbatim
  * @{
  */

/**
  * @brief  Start the comparator.
  * @param  hcomp  COMP handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_COMP_Start(COMP_HandleTypeDef *hcomp)
{
  __IO uint32_t wait_loop_index = 0UL;
  HAL_StatusTypeDef status = HAL_OK;
  uint32_t extiline = 0U;

  /* 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)
        {
          COMP_EXTI_RISING_ENABLE(extiline);
        }
        else
        {
          COMP_EXTI_RISING_DISABLE(extiline);
        }

        /* Configure the trigger falling edge */
        if ((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_EVENT_FALLING) != RESET)
        {
          COMP_EXTI_FALLING_ENABLE(extiline);
        }
        else
        {
          COMP_EXTI_FALLING_DISABLE(extiline);
        }

        /* Enable EXTI event generation */
        COMP_EXTI_ENABLE_EVENT(extiline);

        /* Clear COMP EXTI pending bit */
        COMP_EXTI_CLEAR_FLAG(extiline);
      }

      /* Enable the selected comparator */
      __HAL_COMP_ENABLE(hcomp);

      hcomp->State = HAL_COMP_STATE_BUSY;

      /* Delay for COMP startup time */
      /* Wait loop initialization and execution */
      /* Note: Variable divided by 2 to compensate partially              */
      /*       CPU processing cycles, scaling in us split to not          */
      /*       exceed 32 bits register capacity and handle low frequency. */
      wait_loop_index = ((COMP_DELAY_STARTUP_US / 10UL) * ((SystemCoreClock / (100000UL * 2UL)) + 1UL));
      while (wait_loop_index != 0UL)
      {
        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;

  /* 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 */
      COMP_EXTI_DISABLE_EVENT(COMP_GET_EXTI_LINE(hcomp->Instance));

      /* Disable the selected comparator */
      __HAL_COMP_DISABLE(hcomp);

      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 = 0U;

  /* 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)
        {
          COMP_EXTI_RISING_ENABLE(extiline);
        }
        else
        {
          COMP_EXTI_RISING_DISABLE(extiline);
        }
        /* Configure the trigger falling edge */
        if ((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_IT_FALLING) != RESET)
        {
          COMP_EXTI_FALLING_ENABLE(extiline);
        }
        else
        {
          COMP_EXTI_FALLING_DISABLE(extiline);
        }

        /* Clear COMP EXTI pending bit if any */
        COMP_EXTI_CLEAR_FLAG(extiline);

        /* Enable EXTI interrupt mode */
        COMP_EXTI_ENABLE_IT(extiline);

        /* Enable the selected comparator */
        __HAL_COMP_ENABLE(hcomp);

        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 */
  COMP_EXTI_DISABLE_IT(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 (COMP_EXTI_GET_FLAG(extiline) != RESET)
  {
    /* Clear COMP EXTI pending bit */
    COMP_EXTI_CLEAR_FLAG(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 */
  }
}

/**
  * @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_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.
  * @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));

    /* Set lock flag on state */
    switch (hcomp->State)
    {
      case HAL_COMP_STATE_BUSY:
        hcomp->State = HAL_COMP_STATE_BUSY_LOCKED;
        break;
      case HAL_COMP_STATE_READY:
        hcomp->State = HAL_COMP_STATE_READY_LOCKED;
        break;
      default:
        /* unexpected state */
        status = HAL_ERROR;
        break;
    }
  }

  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)
{
  uint32_t level = 0U;

  /* Check the parameter */
  assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));

  level = READ_BIT(hcomp->Instance->CSR, COMP_CSR_COMPxOUT);

  if (level != 0U)
  {
    return (COMP_OUTPUTLEVEL_HIGH);
  }
  return (COMP_OUTPUTLEVEL_LOW);
}

/**
  * @}
  */

/** @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;
}

/**
  * @brief  Return the COMP error code.
  * @param hcomp COMP handle
  * @retval COMP error code
  */
uint32_t HAL_COMP_GetError(COMP_HandleTypeDef *hcomp)
{
  /* Check the parameters */
  assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
  
  return hcomp->ErrorCode;
}

/**
  * @}
  */

/**
  * @}
  */

#endif /* HAL_COMP_MODULE_ENABLED */
/**
  * @}
  */

/**
  * @}
  */