Diff: targets/cmsis/TARGET_STM/TARGET_STM32L4/stm32l4xx_hal_comp.c

Revision:

610:813dcc80987e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_STM32L4/stm32l4xx_hal_comp.c	Fri Aug 14 13:15:17 2015 +0100
@@ -0,0 +1,725 @@
+/**
+  ******************************************************************************
+  * @file    stm32l4xx_hal_comp.c
+  * @author  MCD Application Team
+  * @version V1.0.0
+  * @date    26-June-2015
+  * @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 non inverting input and inverting input can be set to GPIO pins
+          as shown in Table 1. COMP Inputs below.
+  
+      (#) 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 can be set on GPIO pins. Refer to Table 2. COMP Outputs below.
+  
+      (#) 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().
+
+
+[..] 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   | 
+ (+)  |                 | DAC1 OUT       |  OK   |  OK   |  
+ (+)  |                 | DAC2 OUT       |  OK   |  OK   |  
+ (+)  |                 | IO1            |  PB1  |  PB3  |  
+ (+)  |                 | IO2            |  PC4  |  PB7  |  
+ (+)  |-----------------|----------------|-------|-------|
+ (+)  |  Non Inverting  | IO1            |  PC5  |  PB4  |  
+ (+)  |    Input        | 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)   | 
+ (+)   +------------------------------------+
+
+    
+            ##### 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
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2015 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                 ((uint32_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 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_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)); 
+    
+    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;
+    }
+
+    /* Change COMP peripheral state */
+    hcomp->State = HAL_COMP_STATE_BUSY;
+
+    /* 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)    ||
+       (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 */
+      tmpcsr |= (COMP_CSR_BRGEN | COMP_CSR_SCALEN);
+    }
+    
+    MODIFY_REG(hcomp->Instance->CSR, COMP_CSR_UPDATE_PARAMETERS_MASK, tmpcsr);
+
+    /* Initialize the COMP state*/
+    hcomp->State = HAL_COMP_STATE_READY;
+  }
+  
+  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)
+{
+  /* 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)
+{
+  /* 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 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 */
+      WRITE_REG(EXTI->PR1, 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 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)
+    {
+      /* 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 */
+      WRITE_REG(EXTI->PR1, extiline);
+
+      /* Enable the selected comparator */
+      SET_BIT(hcomp->Instance->CSR, COMP_CSR_EN);
+
+      /* Enable EXTI interrupt mode */
+      SET_BIT(EXTI->IMR1, extiline);
+
+      hcomp->State = HAL_COMP_STATE_BUSY;      
+    }
+    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 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->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.
+  * @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: COMP_OUTPUTLEVEL_LOW or 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)
+{
+  /* 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****/