Diff: targets/cmsis/TARGET_STM/TARGET_STM32L1/stm32l1xx_hal_comp.c

Revision:

394:83f921546702

Parent:

354:e67efb2aab0e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_STM32L1/stm32l1xx_hal_comp.c	Fri Nov 07 15:45:07 2014 +0000
@@ -0,0 +1,810 @@
+/**
+  ******************************************************************************
+  * @file    stm32l1xx_hal_comp.c
+  * @author  MCD Application Team
+  * @version V1.0.0
+  * @date    5-September-2014
+  * @brief   COMP HAL module driver.
+  *    
+  *          This file provides firmware functions to manage the following 
+  *          functionalities of the COMP peripheral:
+  *           + Initialization and de-initialization functions
+  *           + I/O operation functions
+  *           + Peripheral Control functions 
+  *           + Peripheral State functions
+  *         
+  @verbatim
+================================================================================
+          ##### COMP Peripheral features #####
+================================================================================
+           
+  [..]       
+      The STM32L1xx device family integrates 2 analog comparators COMP1 and 
+      COMP2:
+      (#) The non inverting input and inverting input can be set to GPIO pins.
+          Refer to "table1. COMP Inputs" below.
+          HAL COMP driver configures the Routing Interface (RI) to connect the
+          selected I/O pins to comparator input.
+          Caution: Comparator COMP1 and ADC cannot be used at the same time as 
+          ADC since they share the ADC switch matrix: COMP1 non-inverting 
+          input is routed through ADC switch matrix. Except if ADC is intented 
+          to measure voltage on COMP1 non-inverting input: it can be performed 
+          on ADC channel VCOMP.
+
+      (#) The COMP output is available using HAL_COMP_GetOutputLevel().
+
+      (#) The COMP output can be redirected to embedded timers (TIM2, TIM3, 
+          TIM4, TIM10).
+          COMP output cannot be redirected to any I/O pin.
+          Refer to "table 2. COMP Outputs redirection to embedded timers" below.
+
+      (#) The comparators COMP1 and COMP2 can be combined in window mode. 
+          In this mode, COMP2 non inverting input is used as common 
+          non-inverting input.
+  
+      (#) The 2 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 macro __HAL_COMP_EXTI_GET_FLAG(). Possible values are: 
+          (++) COMP_EXTI_LINE_COMP1_EVENT
+          (++) COMP_EXTI_LINE_COMP2_EVENT
+  
+      (#) The comparators also offer the possibility to ouput the voltage 
+          reference (VrefInt), used on inverting inputs, on I/O pin through 
+          a buffer. To use it, refer to macro "__HAL_VREFINT_OUT_ENABLE()".
+
+            
+[..] Table 1. COMP Inputs for the STM32L1xx devices
+ +----------------------------------------------------------------------+
+ |                 |                                |  COMP1  |  COMP2  |
+ |-----------------|--------------------------------|---------|---------|
+ |                 | 1/4 VREFINT                    |   --    |   OK    |
+ |                 | 1/2 VREFINT                    |   --    |   OK    |
+ |                 | 3/4 VREFINT                    |   --    |   OK    |
+ | Inverting       | VREFINT                        |   OK    |   OK    |
+ | input           | DAC Ch1 OUT (PA4)              |   --    |   OK    |
+ |                 | DAC Ch2 OUT (PA5)              |   --    |   OK    |
+ |                 | IO: PB3                        |   --    |   OK    |
+ |-----------------|--------------------------------|---------|---------|
+ |                 | IO:                            |         |         |
+ |                 |   PB4, 5, 6*, 7*               |   ---   |   OK    |
+ | Non-inverting   |   PA0*, 1*, 2*, 3*, 4, 5, 6, 7 |   OK    |   ---   |
+ | input           |   PB0, 1, 12, 13, 14, 15       |   OK    |   ---   |
+ |                 |   PC0, 1, 2, 3, 4, 5           |   OK    |   ---   |
+ |                 |   PE7, 8, 9, 10                |   OK    |   ---   |
+ |                 |   PF6, 7, 8, 9, 10             |   OK    |   ---   |
+ |                 | OPAMP1 output                  |   OK    |   ---   |
+ |                 | OPAMP2 output                  |   OK    |   ---   |
+ |                 | OPAMP3 output**                |   OK    |   ---   |
+ +----------------------------------------------------------------------+
+ *: Available on devices category Cat.3, Cat.4, Cat.5 only. 
+ **: Available on devices category Cat.4 only. 
+
+ [..] Table 2. COMP Outputs redirection to embedded timers
+ +-----------------------------------+     
+ |      COMP1      |      COMP2      |
+ |-----------------|-----------------|
+ |                 |  TIM2 IC4       |
+ |                 |  TIM2 OCREF CLR |
+ | (no redirection |  TIM3 IC4       |
+ |   to timers)    |  TIM3 OCREF CLR |
+ |                 |  TIM4 IC4       |
+ |                 |  TIM4 OCREF CLR |
+ |                 |  TIM10 IC1      |
+ +-----------------------------------+
+
+
+            ##### How to use this driver #####
+================================================================================
+  [..]
+      This driver provides functions to configure and program the Comparators of all STM32L1xx devices.
+
+      To use the comparator, perform the following steps:
+  
+      (#)  Initialize the COMP low level resources by implementing the HAL_COMP_MspInit().
+      (++) Configure the comparator input I/O pin using HAL_GPIO_Init():
+           - For all inputs: I/O pin in analog mode (Schmitt trigger disabled)
+           - Possible alternate configuration, for non-inverting inputs of comparator 2: I/O pin in floating mode (Schmitt trigger enabled).
+           It is recommended to use analog configuration to avoid any overconsumption around VDD/2.
+      (++) Enable COMP Peripheral clock using macro __COMP_CLK_ENABLE()
+      (++) If required enable the COMP interrupt (EXTI line Interrupt): enable
+           the comparator interrupt vector using HAL_NVIC_EnableIRQ(COMP_IRQn)
+           and HAL_NVIC_SetPriority(COMP_IRQn, xxx, xxx) functions.
+  
+      (#) Configure the comparator using HAL_COMP_Init() function:
+      (++) Select the inverting input (COMP2 only)
+      (++) Select the non-inverting input
+      (++) Select the output redirection to timers (COMP2 only)
+      (++) Select the speed mode (COMP2 only)
+      (++) Select the window mode (related to COMP1 and COMP2, but selected 
+           by COMP2 only)
+      (++) Select the pull-up/down resistors on non-inverting input (COMP1 only)
+
+      (#) Enable the comparator using HAL_COMP_Start() or HAL_COMP_Start_IT() 
+          function
+    
+      (#) If needed, use HAL_COMP_GetOutputLevel() or HAL_COMP_TriggerCallback()
+          functions to manage comparator actions (output level or events)
+
+      (#) Disable the comparator using HAL_COMP_Stop() or HAL_COMP_Stop_IT() 
+          function
+
+      (#) De-initialize the comparator using HAL_COMP_DeInit() function
+
+
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2014 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 "stm32l1xx_hal.h"
+
+/** @addtogroup STM32L1xx_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
+  * @{
+  */
+  /* Delay for COMP startup time.                                             */
+  /* Maximum delay is 10us for comparator 1 and 25us for comparator 2 in slow */
+  /* mode (refer to device datasheet, parameter tSTART).                      */
+  /* Delay in CPU cycles, fixed to worst case: maximum CPU frequency 32MHz to */
+  /* have the minimum number of CPU cycles to fulfill this delay.             */
+  /*  - Comparator 1: delay minimum of 320 CPU cyles. Wait loop takes 3 CPU   */
+  /*                 cycles per iteration, therefore total wait iterations    */
+  /*                 number must be initialized at 106 iterations.            */
+  /*  - Comparator 2: delay minimum of 800 CPU cyles. Wait loop takes 3 CPU   */
+  /*                 cycles per iteration, therefore total wait iterations    */
+  /*                 number must be initialized at 266 iterations.            */
+#define COMP1_START_DELAY_CPU_CYCLES       ((uint32_t)106)
+#define COMP2_START_DELAY_CPU_CYCLES       ((uint32_t)266)
+
+  /* Comparator status "locked": to update COMP handle state (software lock   */
+  /* only on COMP of STM32L1xx devices) by bitfield:                          */
+  /* states HAL_COMP_STATE_READY_LOCKED, HAL_COMP_STATE_BUSY_LOCKED.          */
+#define COMP_STATE_BIT_LOCK     ((uint32_t) 0x00000010)  
+
+/**
+  * @}
+  */
+
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup COMP_Exported_Functions COMP Exported Functions
+  * @{
+  */
+
+/** @defgroup COMP_Exported_Functions_Group1 Initialization and de-initialization functions 
+ *  @brief    Initialization and Configuration functions 
+ *
+@verbatim    
+ ===============================================================================
+              ##### Initialization and de-initialization 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;
+  
+  /* Check the COMP handle allocation and lock status */
+  if((hcomp == HAL_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->Instance == COMP1)
+    {
+      assert_param(IS_COMP_NONINVERTINGINPUTPULL(hcomp->Init.NonInvertingInputPull));
+    }
+    else /* if (hcomp->Instance == COMP2) */
+    {
+      assert_param(IS_COMP_INVERTINGINPUT(hcomp->Init.InvertingInput));
+      assert_param(IS_COMP_OUTPUT(hcomp->Init.Output));
+      assert_param(IS_COMP_MODE(hcomp->Init.Mode));
+      assert_param(IS_COMP_WINDOWMODE(hcomp->Init.WindowMode));
+    }
+  
+    /* In window mode, non-inverting inputs of the 2 comparators are          */
+    /* connected together and are using inputs of COMP2 only. If COMP1 is     */
+    /* selected, this parameter is discarded.                                 */
+    if ((hcomp->Init.WindowMode == COMP_WINDOWMODE_DISABLED) ||
+        (hcomp->Instance == COMP2)                             )
+    {
+      assert_param(IS_COMP_NONINVERTINGINPUT(hcomp->Init.NonInvertingInput));
+    }
+    
+      
+    /* Enable SYSCFG clock and the low level hardware to access comparators */
+    if(hcomp->State == HAL_COMP_STATE_RESET)
+    {
+      /* Enable SYSCFG clock to control the routing Interface (RI) */
+      __SYSCFG_CLK_ENABLE();
+      
+      /* Init the low level hardware */
+      HAL_COMP_MspInit(hcomp);
+    }
+  
+    /* Configuration of comparator:                                           */
+    /*  - Output selection                                                    */
+    /*  - Inverting input selection                                           */
+    /*  - Window mode                                                         */
+    /*  - Mode fast/slow speed                                                */
+    /*  - Inverting input pull-up/down resistors                              */
+    
+    /* Configuration depending on comparator instance */
+    if (hcomp->Instance == COMP1)
+    {
+      MODIFY_REG(COMP->CSR, COMP_CSR_400KPD | COMP_CSR_10KPD | COMP_CSR_400KPU | COMP_CSR_10KPU,
+                            hcomp->Init.NonInvertingInputPull                                   );
+    }
+    else /* if (hcomp->Instance == COMP2) */
+    {
+      /* Note: If comparator 2 is not enabled, inverting input (parameter     */
+      /*       "hcomp->Init.InvertingInput") is configured into function      */
+      /*       "HAL_COMP_Start()" since inverting  input selection also       */
+      /*       enables the comparator 2.                                      */
+      /*       If comparator 2 is already enabled, inverting input is         */
+      /*       reconfigured on the fly.                                       */
+      if (__COMP_IS_ENABLED(hcomp) == RESET)
+      {
+        MODIFY_REG(COMP->CSR, COMP_CSR_OUTSEL  |
+                              COMP_CSR_WNDWE   |
+                              COMP_CSR_SPEED          ,
+                              hcomp->Init.Output     |
+                              hcomp->Init.WindowMode |
+                              hcomp->Init.Mode        );
+      }
+      else
+      {
+        MODIFY_REG(COMP->CSR, COMP_CSR_OUTSEL  |
+                              COMP_CSR_INSEL   |
+                              COMP_CSR_WNDWE   |
+                              COMP_CSR_SPEED              ,
+                              hcomp->Init.Output         |
+                              hcomp->Init.InvertingInput |
+                              hcomp->Init.WindowMode     |
+                              hcomp->Init.Mode            );
+      }
+    }
+    
+    /* Configure Routing Interface (RI) switches for comparator non-inverting */
+    /* input.                                                                 */
+    /* Except in 2 cases:                                                     */
+    /* - if non-inverting input has no selection: it can be the case for      */
+    /*   COMP1 in window mode.                                                */
+    /* - particular case for PC3: if switch COMP1_SW1 is closed               */
+    /*   (by macro "__HAL_OPAMP_OPAMP3OUT_CONNECT_ADC_COMP1()" or             */
+    /*   "__HAL_RI_SWITCH_COMP1_SW1_CLOSE()"), connection between pin PC3     */
+    /*    (or OPAMP3, if available) and COMP1 is done directly, without going */
+    /*    through ADC switch matrix.                                          */
+    if (__COMP_ROUTING_INTERFACE_TOBECONFIGURED(hcomp))
+    {
+      if (hcomp->Instance == COMP1)
+      {
+        /* Enable the switch control mode */
+        __HAL_RI_SWITCHCONTROLMODE_ENABLE();
+
+        /* Close the analog switch of ADC switch matrix to COMP1 (ADC         */
+        /* channel 26: Vcomp)                                                 */
+        __HAL_RI_IOSWITCH_CLOSE(RI_IOSWITCH_VCOMP);
+      }
+
+      /* Close the I/O analog switch corresponding to comparator              */
+      /* non-inverting input selected.                                        */
+      __HAL_RI_IOSWITCH_CLOSE(hcomp->Init.NonInvertingInput);
+    }
+
+    
+    /* Initialize the COMP state*/
+    if(hcomp->State == HAL_COMP_STATE_RESET)
+    {
+      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;
+
+  /* Check the COMP handle allocation and lock status */
+  if((hcomp == HAL_NULL) || ((hcomp->State & COMP_STATE_BIT_LOCK) != RESET))
+  {
+    status = HAL_ERROR;
+  }
+  else
+  {
+    /* Check the parameter */
+    assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
+    
+    /* Reset configuration depending on comparator instance */
+    if (hcomp->Instance == COMP1)
+    {
+      CLEAR_BIT(COMP->CSR , COMP_CSR_400KPD | COMP_CSR_10KPD | COMP_CSR_400KPU | COMP_CSR_10KPU);
+    }
+    else /* if (hcomp->Instance == COMP2) */
+    {
+      CLEAR_BIT(COMP->CSR , COMP_CSR_OUTSEL |
+                            COMP_CSR_WNDWE  |
+                            COMP_CSR_INSEL  |
+                            COMP_CSR_SPEED   );
+    }
+    
+    
+    /* Restore default state of Routing Interface (RI) switches for           */
+    /* comparator non-inverting input.                                        */
+    if (hcomp->Init.NonInvertingInput != COMP_NONINVERTINGINPUT_NONE)
+    {
+      /* Open the I/O analog switch corresponding to comparator               */
+      /* non-inverting input selected.                                        */
+      __HAL_RI_IOSWITCH_OPEN(hcomp->Init.NonInvertingInput);
+    }
+    if (hcomp->Instance == COMP1)
+    {
+      /* Open the analog switch of ADC switch matrix to COMP1 (ADC            */
+      /* channel 26: Vcomp)                                                   */
+      __HAL_RI_IOSWITCH_OPEN(RI_IOSWITCH_VCOMP);
+      
+      /* Disable the switch control mode */
+      __HAL_RI_SWITCHCONTROLMODE_DISABLE();
+    }
+  
+    
+    /* DeInit the low level hardware: SYSCFG, GPIO, CLOCK and NVIC */
+    HAL_COMP_MspDeInit(hcomp);
+
+    hcomp->State = HAL_COMP_STATE_RESET;
+    
+    /* Process unlocked */
+    __HAL_UNLOCK(hcomp);
+  }
+  
+  return status;
+}
+
+/**
+  * @brief  Initializes 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 implenetd in the user file
+   */
+}
+
+/**
+  * @brief  DeInitializes 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 implenetd in the user file
+   */
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup COMP_Exported_Functions_Group2 I/O operation functions 
+ *  @brief   I/O operation functions
+ *
+@verbatim   
+ ===============================================================================
+                      ##### IO operation functions #####
+ ===============================================================================  
+    [..]
+    This subsection provides a set of functions allowing to manage the COMP 
+    start and stop actions with or without interruption on ExtI line.
+
+@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 wait_loop_cycles = 0;
+  __IO uint32_t wait_loop_index = 0;
+  
+  /* Check the COMP handle allocation and lock status */
+  if((hcomp == HAL_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)
+    {
+      
+      /* Note: For comparator 2, inverting input (parameter                   */
+      /*       "hcomp->Init.InvertingInput") is configured into this          */
+      /*       function instead of function "HAL_COMP_Init()" since           */
+      /*       inverting input selection also enables the comparator 2.       */
+      __HAL_COMP_ENABLE(hcomp);
+
+      /* Set delay for COMP startup time */
+      if (hcomp->Instance == COMP1)
+      {
+        wait_loop_cycles = COMP1_START_DELAY_CPU_CYCLES;
+      }
+      else /* if (hcomp->Instance == COMP2) */
+      {
+        wait_loop_cycles = COMP2_START_DELAY_CPU_CYCLES;
+      }
+
+      /* Delay for COMP startup time.                                         */
+      /* Delay fixed to worst case: maximum CPU frequency                     */
+      while(wait_loop_index < wait_loop_cycles)
+      {
+        wait_loop_index++;
+      }
+
+      /* Update COMP state */
+      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 == HAL_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 */
+      __HAL_COMP_DISABLE(hcomp);
+      
+      /* Update COMP state */
+      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 = 0;
+  
+  status = HAL_COMP_Start(hcomp);
+  if(status == HAL_OK)
+  {
+    /* Check the parameter */
+    assert_param(IS_COMP_TRIGGERMODE(hcomp->Init.TriggerMode));
+    
+    /* Get the Exti Line output configuration */
+    extiline = __HAL_COMP_GET_EXTI_LINE(hcomp->Instance);
+    
+    /* Configure the rising edge */
+    /* COMP TriggerMode set to COMP_TRIGGERMODE_IT_RISING or                  */
+    /* COMP_TRIGGERMODE_IT_RISING_FALLING.                                    */
+    if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_IT_RISING) != RESET)
+    {
+      __HAL_COMP_EXTI_RISING_IT_ENABLE(extiline);
+    }
+    else
+    {
+      __HAL_COMP_EXTI_RISING_IT_DISABLE(extiline);
+    }
+    
+    /* Configure the falling edge */
+    /* COMP TriggerMode set to COMP_TRIGGERMODE_IT_FALLING or                 */
+    /* COMP_TRIGGERMODE_IT_RISING_FALLING.                                    */
+    if((hcomp->Init.TriggerMode & COMP_TRIGGERMODE_IT_FALLING) != RESET)
+    {
+      __HAL_COMP_EXTI_FALLING_IT_ENABLE(extiline);
+    }
+    else
+    {
+      __HAL_COMP_EXTI_FALLING_IT_DISABLE(extiline);
+    }
+    
+    /* Enable Exti interrupt mode */
+    __HAL_COMP_EXTI_ENABLE_IT(extiline);
+    /* Clear COMP Exti pending bit */
+    __HAL_COMP_EXTI_CLEAR_FLAG(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 */
+  __HAL_COMP_EXTI_DISABLE_IT(__HAL_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 = __HAL_COMP_GET_EXTI_LINE(hcomp->Instance);
+  
+  /* Check COMP Exti flag */
+  if(__HAL_COMP_EXTI_GET_FLAG(extiline) != RESET)
+  {
+    /* Clear COMP Exti pending bit */
+    __HAL_COMP_EXTI_CLEAR_FLAG(extiline);
+
+    /* COMP trigger user callback */
+    HAL_COMP_TriggerCallback(hcomp);    
+  }
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup COMP_Exported_Functions_Group3 Peripheral Control functions
+ *  @brief   Peripheral Control functions
+ *
+@verbatim   
+ ===============================================================================
+                      ##### Peripheral Control functions #####
+ ===============================================================================  
+    [..]
+    This subsection provides a set of functions allowing to control the COMP 
+    management functions: Lock status, comparator output level check, IRQ
+    callback (in case of usage of comparator with interruption on ExtI line).
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Lock the selected comparator configuration.
+  *         Caution: On STM32L1, HAL COMP lock is software lock only (not  
+  *         hardware lock as on some other STM32 devices)
+  * @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 == HAL_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;
+  }
+  
+  return status; 
+}
+
+/**
+  * @brief  Return the output level (high or low) of the selected comparator. 
+  *         The output level depends on the selected polarity.
+  *           - 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
+  * @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;
+  
+  /* Check the parameter */
+  assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
+
+  /* Read output level of the selected comparator */
+  if(READ_BIT(COMP->CSR, __COMP_CSR_CMPXOUT(hcomp)) == RESET)
+  {
+    level = COMP_OUTPUTLEVEL_LOW;
+  }
+  else
+  {
+    level = COMP_OUTPUTLEVEL_HIGH;
+  }
+  
+  return(level);
+}
+
+/**
+  * @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 permit to get in run-time the status of the peripheral.
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Return the COMP state
+  * @param  hcomp : COMP handle
+  * @retval HAL state
+  */
+HAL_COMP_StateTypeDef HAL_COMP_GetState(COMP_HandleTypeDef *hcomp)
+{
+  /* Check the COMP handle allocation */
+  if(hcomp == HAL_NULL)
+  {
+    return HAL_COMP_STATE_RESET;
+  }
+
+  /* Check the parameter */
+  assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
+
+  return hcomp->State;
+}
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#endif /* HAL_COMP_MODULE_ENABLED */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/