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/**

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

  * @file    stm32l1xx_hal_adc.c

  * @author  MCD Application Team

  * @brief   This file provides firmware functions to manage the following

  *          functionalities of the Analog to Digital Convertor (ADC)

  *          peripheral:

  *           + Initialization and de-initialization functions

  *             ++ Initialization and Configuration of ADC

  *           + Operation functions

  *             ++ Start, stop, get result of conversions of regular

  *                group, using 3 possible modes: polling, interruption or DMA.

  *           + Control functions

  *             ++ Channels configuration on regular group

  *             ++ Channels configuration on injected group

  *             ++ Analog Watchdog configuration

  *           + State functions

  *             ++ ADC state machine management

  *             ++ Interrupts and flags management

  *          Other functions (extended functions) are available in file

  *          "stm32l1xx_hal_adc_ex.c".

  *

  @verbatim

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

                     ##### ADC peripheral features #####

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

  [..]

  (+) 12-bit, 10-bit, 8-bit or 6-bit configurable resolution

  (+) Interrupt generation at the end of regular conversion, end of injected

      conversion, and in case of analog watchdog or overrun events.

  (+) Single and continuous conversion modes.

  (+) Scan mode for conversion of several channels sequentially.

  (+) Data alignment with in-built data coherency.

  (+) Programmable sampling time (channel wise)

  (+) ADC conversion of regular group and injected group.

  (+) External trigger (timer or EXTI) with configurable polarity

      for both regular and injected groups.

  (+) DMA request generation for transfer of conversions data of regular group.

  (+) ADC offset on injected channels

  (+) ADC supply requirements: 2.4 V to 3.6 V at full speed and down to 1.8 V at

      slower speed.

  (+) ADC input range: from Vref- (connected to Vssa) to Vref+ (connected to

      Vdda or to an external voltage reference).

                     ##### How to use this driver #####

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

    [..]

     *** Configuration of top level parameters related to ADC ***

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

     [..]

    (#) Enable the ADC interface

      (++) As prerequisite, ADC clock must be configured at RCC top level.

           Caution: On STM32L1, ADC clock frequency max is 16MHz (refer

                    to device datasheet).

                    Therefore, ADC clock prescaler must be configured in

                    function of ADC clock source frequency to remain below

                    this maximum frequency.

        (++) Two clock settings are mandatory:

             (+++) ADC clock (core clock).

             (+++) ADC clock (conversions clock).

                   Only one possible clock source: derived from HSI RC 16MHz oscillator

                   (HSI).

                   ADC is connected directly to HSI RC 16MHz oscillator.

                   Therefore, RCC PLL setting has no impact on ADC.

                   PLL can be disabled (".PLL.PLLState = RCC_PLL_NONE") or

                   enabled with HSI16 as clock source

                   (".PLL.PLLSource = RCC_PLLSOURCE_HSI") to be used as device

                   main clock source SYSCLK.

                   The only mandatory setting is ".HSIState = RCC_HSI_ON"

             (+++) Example:

                   Into HAL_ADC_MspInit() (recommended code location) or with

                   other device clock parameters configuration:

               (+++) __HAL_RCC_ADC1_CLK_ENABLE();

               (+++) HAL_RCC_GetOscConfig(&RCC_OscInitStructure);

               (+++) RCC_OscInitStructure.OscillatorType = (... | RCC_OSCILLATORTYPE_HSI);

               (+++) RCC_OscInitStructure.HSIState = RCC_HSI_ON;

               (+++) RCC_OscInitStructure.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;

               (+++) RCC_OscInitStructure.PLL.PLLState = RCC_PLL_NONE;

               (+++) RCC_OscInitStructure.PLL.PLLSource = ...

               (+++) RCC_OscInitStructure.PLL...

               (+++) HAL_RCC_OscConfig(&RCC_OscInitStructure);

        (++) ADC clock prescaler is configured at ADC level with

             parameter "ClockPrescaler" using function HAL_ADC_Init().

    (#) ADC pins configuration

         (++) Enable the clock for the ADC GPIOs

              using macro __HAL_RCC_GPIOx_CLK_ENABLE()

         (++) Configure these ADC pins in analog mode

              using function HAL_GPIO_Init()

    (#) Optionally, in case of usage of ADC with interruptions:

         (++) Configure the NVIC for ADC

              using function HAL_NVIC_EnableIRQ(ADCx_IRQn)

         (++) Insert the ADC interruption handler function HAL_ADC_IRQHandler()

              into the function of corresponding ADC interruption vector

              ADCx_IRQHandler().

    (#) Optionally, in case of usage of DMA:

         (++) Configure the DMA (DMA channel, mode normal or circular, ...)

              using function HAL_DMA_Init().

         (++) Configure the NVIC for DMA

              using function HAL_NVIC_EnableIRQ(DMAx_Channelx_IRQn)

         (++) Insert the ADC interruption handler function HAL_ADC_IRQHandler()

              into the function of corresponding DMA interruption vector

              DMAx_Channelx_IRQHandler().

     *** Configuration of ADC, groups regular/injected, channels parameters ***

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

     [..]

    (#) Configure the ADC parameters (resolution, data alignment, ...)

        and regular group parameters (conversion trigger, sequencer, ...)

        using function HAL_ADC_Init().

    (#) Configure the channels for regular group parameters (channel number,

        channel rank into sequencer, ..., into regular group)

        using function HAL_ADC_ConfigChannel().

    (#) Optionally, configure the injected group parameters (conversion trigger,

        sequencer, ..., of injected group)

        and the channels for injected group parameters (channel number,

        channel rank into sequencer, ..., into injected group)

        using function HAL_ADCEx_InjectedConfigChannel().

    (#) Optionally, configure the analog watchdog parameters (channels

        monitored, thresholds, ...)

        using function HAL_ADC_AnalogWDGConfig().

    (#) Optionally, for devices with several ADC instances: configure the

        multimode parameters

        using function HAL_ADCEx_MultiModeConfigChannel().

     *** Execution of ADC conversions ***

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

     [..]

    (#) ADC driver can be used among three modes: polling, interruption,

        transfer by DMA.

        (++) ADC conversion by polling:

          (+++) Activate the ADC peripheral and start conversions

                using function HAL_ADC_Start()

          (+++) Wait for ADC conversion completion

                using function HAL_ADC_PollForConversion()

                (or for injected group: HAL_ADCEx_InjectedPollForConversion() )

          (+++) Retrieve conversion results

                using function HAL_ADC_GetValue()

                (or for injected group: HAL_ADCEx_InjectedGetValue() )

          (+++) Stop conversion and disable the ADC peripheral

                using function HAL_ADC_Stop()

        (++) ADC conversion by interruption:

          (+++) Activate the ADC peripheral and start conversions

                using function HAL_ADC_Start_IT()

          (+++) Wait for ADC conversion completion by call of function

                HAL_ADC_ConvCpltCallback()

                (this function must be implemented in user program)

                (or for injected group: HAL_ADCEx_InjectedConvCpltCallback() )

          (+++) Retrieve conversion results

                using function HAL_ADC_GetValue()

                (or for injected group: HAL_ADCEx_InjectedGetValue() )

          (+++) Stop conversion and disable the ADC peripheral

                using function HAL_ADC_Stop_IT()

        (++) ADC conversion with transfer by DMA:

          (+++) Activate the ADC peripheral and start conversions

                using function HAL_ADC_Start_DMA()

          (+++) Wait for ADC conversion completion by call of function

                HAL_ADC_ConvCpltCallback() or HAL_ADC_ConvHalfCpltCallback()

                (these functions must be implemented in user program)

          (+++) Conversion results are automatically transferred by DMA into

                destination variable address.

          (+++) Stop conversion and disable the ADC peripheral

                using function HAL_ADC_Stop_DMA()

        (++) For devices with several ADCs: ADC multimode conversion

             with transfer by DMA:

          (+++) Activate the ADC peripheral (slave) and start conversions

                using function HAL_ADC_Start()

          (+++) Activate the ADC peripheral (master) and start conversions

                using function HAL_ADCEx_MultiModeStart_DMA()

          (+++) Wait for ADC conversion completion by call of function

                HAL_ADC_ConvCpltCallback() or HAL_ADC_ConvHalfCpltCallback()

                (these functions must be implemented in user program)

          (+++) Conversion results are automatically transferred by DMA into

                destination variable address.

          (+++) Stop conversion and disable the ADC peripheral (master)

                using function HAL_ADCEx_MultiModeStop_DMA()

          (+++) Stop conversion and disable the ADC peripheral (slave)

                using function HAL_ADC_Stop_IT()

     [..]

    (@) Callback functions must be implemented in user program:

      (+@) HAL_ADC_ErrorCallback()

      (+@) HAL_ADC_LevelOutOfWindowCallback() (callback of analog watchdog)

      (+@) HAL_ADC_ConvCpltCallback()

      (+@) HAL_ADC_ConvHalfCpltCallback

      (+@) HAL_ADCEx_InjectedConvCpltCallback()

     *** Deinitialization of ADC ***

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

     [..]

    (#) Disable the ADC interface

      (++) ADC clock can be hard reset and disabled at RCC top level.

        (++) Hard reset of ADC peripherals

             using macro __ADCx_FORCE_RESET(), __ADCx_RELEASE_RESET().

        (++) ADC clock disable

             using the equivalent macro/functions as configuration step.

             (+++) Example:

                   Into HAL_ADC_MspDeInit() (recommended code location) or with

                   other device clock parameters configuration:

               (+++) HAL_RCC_GetOscConfig(&RCC_OscInitStructure);

               (+++) RCC_OscInitStructure.OscillatorType = RCC_OSCILLATORTYPE_HSI;

               (+++) RCC_OscInitStructure.HSIState = RCC_HSI_OFF; (if not used for system clock)

               (+++) HAL_RCC_OscConfig(&RCC_OscInitStructure);

    (#) ADC pins configuration

         (++) Disable the clock for the ADC GPIOs

              using macro __HAL_RCC_GPIOx_CLK_DISABLE()

    (#) Optionally, in case of usage of ADC with interruptions:

         (++) Disable the NVIC for ADC

              using function HAL_NVIC_EnableIRQ(ADCx_IRQn)

    (#) Optionally, in case of usage of DMA:

         (++) Deinitialize the DMA

              using function HAL_DMA_Init().

         (++) Disable the NVIC for DMA

              using function HAL_NVIC_EnableIRQ(DMAx_Channelx_IRQn)

    [..]

    *** Callback registration ***

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

    [..]

     The compilation flag USE_HAL_ADC_REGISTER_CALLBACKS, when set to 1,

     allows the user to configure dynamically the driver callbacks.

     Use Functions @ref HAL_ADC_RegisterCallback()

     to register an interrupt callback.

    [..]

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

       (+) ConvCpltCallback               : ADC conversion complete callback

       (+) ConvHalfCpltCallback           : ADC conversion DMA half-transfer callback

       (+) LevelOutOfWindowCallback       : ADC analog watchdog 1 callback

       (+) ErrorCallback                  : ADC error callback

       (+) InjectedConvCpltCallback       : ADC group injected conversion complete callback

       (+) MspInitCallback                : ADC Msp Init callback

       (+) MspDeInitCallback              : ADC Msp DeInit callback

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

     and a pointer to the user callback function.

    [..]

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

     weak function.

    [..]

     @ref HAL_ADC_UnRegisterCallback takes as parameters the HAL peripheral handle,

     and the Callback ID.

     This function allows to reset following callbacks:

       (+) ConvCpltCallback               : ADC conversion complete callback

       (+) ConvHalfCpltCallback           : ADC conversion DMA half-transfer callback

       (+) LevelOutOfWindowCallback       : ADC analog watchdog 1 callback

       (+) ErrorCallback                  : ADC error callback

       (+) InjectedConvCpltCallback       : ADC group injected conversion complete callback

       (+) MspInitCallback                : ADC Msp Init callback

       (+) MspDeInitCallback              : ADC Msp DeInit callback

     [..]

     By default, after the @ref HAL_ADC_Init() and when the state is @ref HAL_ADC_STATE_RESET

     all callbacks are set to the corresponding weak functions:

     examples @ref HAL_ADC_ConvCpltCallback(), @ref HAL_ADC_ErrorCallback().

     Exception done for MspInit and MspDeInit functions that are

     reset to the legacy weak functions in the @ref HAL_ADC_Init()/ @ref HAL_ADC_DeInit() only when

     these callbacks are null (not registered beforehand).

    [..]

     If MspInit or MspDeInit are not null, the @ref HAL_ADC_Init()/ @ref HAL_ADC_DeInit()

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

     [..]

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

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

     in @ref HAL_ADC_STATE_READY or @ref HAL_ADC_STATE_RESET state,

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

    [..]

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

     using @ref HAL_ADC_RegisterCallback() before calling @ref HAL_ADC_DeInit()

     or @ref HAL_ADC_Init() function.

     [..]

     When the compilation flag USE_HAL_ADC_REGISTER_CALLBACKS is set to 0 or

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

     are set to the corresponding weak functions.

  @endverbatim

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

  * @attention

  *

  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.

  * All rights reserved.</center></h2>

  *

  * This software component is licensed by ST under BSD 3-Clause license,

  * the "License"; You may not use this file except in compliance with the

  * License. You may obtain a copy of the License at:

  *                        opensource.org/licenses/BSD-3-Clause

  *

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

  */

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

#include "stm32l1xx_hal.h"

/** @addtogroup STM32L1xx_HAL_Driver

  * @{

  */

/** @defgroup ADC ADC

  * @brief ADC HAL module driver

  * @{

  */

#ifdef HAL_ADC_MODULE_ENABLED

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

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

/** @defgroup ADC_Private_Constants ADC Private Constants

  * @{

  */

  /* Timeout values for ADC enable and disable settling time.                 */

  /* Values defined to be higher than worst cases: low clocks freq,           */

  /* maximum prescaler.                                                       */

  /* Ex of profile low frequency : Clock source at 0.1 MHz, ADC clock         */

  /* prescaler 4, sampling time 7.5 ADC clock cycles, resolution 12 bits.     */

  /* Unit: ms                                                                 */

  #define ADC_ENABLE_TIMEOUT              (2U)

  #define ADC_DISABLE_TIMEOUT             (2U)

  /* Delay for ADC stabilization time.                                        */

  /* Maximum delay is 1us (refer to device datasheet, parameter tSTAB).       */

  /* Unit: us                                                                 */

  #define ADC_STAB_DELAY_US               (3U)

  /* Delay for temperature sensor stabilization time.                         */

  /* Maximum delay is 10us (refer to device datasheet, parameter tSTART).     */

  /* Unit: us                                                                 */

  #define ADC_TEMPSENSOR_DELAY_US         (10U)

/**

  * @}

  */

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

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

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

/** @defgroup ADC_Private_Functions ADC Private Functions

  * @{

  */

static void ADC_DMAConvCplt(DMA_HandleTypeDef *hdma);

static void ADC_DMAHalfConvCplt(DMA_HandleTypeDef *hdma);

static void ADC_DMAError(DMA_HandleTypeDef *hdma);

/**

  * @}

  */

/* Exported functions --------------------------------------------------------*/

/** @defgroup ADC_Exported_Functions ADC Exported Functions

  * @{

  */

/** @defgroup ADC_Exported_Functions_Group1 ADC Initialization/de-initialization functions

  * @brief    ADC Initialization and Configuration functions

  *

@verbatim    

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

              ##### Initialization and de-initialization functions #####

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

    [..]  This section provides functions allowing to:

      (+) Initialize and configure the ADC.

      (+) De-initialize the ADC.

@endverbatim

  * @{

  */

/**

  * @brief  Initializes the ADC peripheral and regular group according to  

  *         parameters specified in structure "ADC_InitTypeDef".

  * @note   As prerequisite, ADC clock must be configured at RCC top level

  *         (clock source APB2).

  *         See commented example code below that can be copied and uncommented

  *         into HAL_ADC_MspInit().

  * @note   Possibility to update parameters on the fly:

  *         This function initializes the ADC MSP (HAL_ADC_MspInit()) only when

  *         coming from ADC state reset. Following calls to this function can

  *         be used to reconfigure some parameters of ADC_InitTypeDef  

  *         structure on the fly, without modifying MSP configuration. If ADC  

  *         MSP has to be modified again, HAL_ADC_DeInit() must be called

  *         before HAL_ADC_Init().

  *         The setting of these parameters is conditioned to ADC state.

  *         For parameters constraints, see comments of structure

  *         "ADC_InitTypeDef".

  * @note   This function configures the ADC within 2 scopes: scope of entire

  *         ADC and scope of regular group. For parameters details, see comments

  *         of structure "ADC_InitTypeDef".

  * @param  hadc ADC handle

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_ADC_Init(ADC_HandleTypeDef* hadc)

{

  HAL_StatusTypeDef tmp_hal_status = HAL_OK;

  uint32_t tmp_cr1 = 0;

  uint32_t tmp_cr2 = 0;

  /* Check ADC handle */

  if(hadc == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_ADC_ALL_INSTANCE(hadc->Instance));

  assert_param(IS_ADC_CLOCKPRESCALER(hadc->Init.ClockPrescaler));

  assert_param(IS_ADC_RESOLUTION(hadc->Init.Resolution));

  assert_param(IS_ADC_DATA_ALIGN(hadc->Init.DataAlign));

  assert_param(IS_ADC_SCAN_MODE(hadc->Init.ScanConvMode));

  assert_param(IS_ADC_EOC_SELECTION(hadc->Init.EOCSelection));

  assert_param(IS_ADC_AUTOWAIT(hadc->Init.LowPowerAutoWait));

  assert_param(IS_ADC_AUTOPOWEROFF(hadc->Init.LowPowerAutoPowerOff));

  assert_param(IS_ADC_CHANNELSBANK(hadc->Init.ChannelsBank));

  assert_param(IS_FUNCTIONAL_STATE(hadc->Init.ContinuousConvMode));

  assert_param(IS_ADC_EXTTRIG(hadc->Init.ExternalTrigConv));

  assert_param(IS_FUNCTIONAL_STATE(hadc->Init.DMAContinuousRequests));

  if(hadc->Init.ScanConvMode != ADC_SCAN_DISABLE)

  {

    assert_param(IS_ADC_REGULAR_NB_CONV(hadc->Init.NbrOfConversion));

    assert_param(IS_FUNCTIONAL_STATE(hadc->Init.DiscontinuousConvMode));

    if(hadc->Init.DiscontinuousConvMode != DISABLE)

    {

      assert_param(IS_ADC_REGULAR_DISCONT_NUMBER(hadc->Init.NbrOfDiscConversion));

    }

  }

  if(hadc->Init.ExternalTrigConv != ADC_SOFTWARE_START)

  {

    assert_param(IS_ADC_EXTTRIG_EDGE(hadc->Init.ExternalTrigConvEdge));

  }

  /* As prerequisite, into HAL_ADC_MspInit(), ADC clock must be configured    */

  /* at RCC top level.                                                        */

  /* Refer to header of this file for more details on clock enabling          */

  /* procedure.                                                               */

  /* Actions performed only if ADC is coming from state reset:                */

  /* - Initialization of ADC MSP                                              */

  if (hadc->State == HAL_ADC_STATE_RESET)

  {

    /* Initialize ADC error code */

    ADC_CLEAR_ERRORCODE(hadc);

    /* Allocate lock resource and initialize it */

    hadc->Lock = HAL_UNLOCKED;

    /* Enable SYSCFG clock to control the routing Interface (RI) */

    __HAL_RCC_SYSCFG_CLK_ENABLE();

#if (USE_HAL_ADC_REGISTER_CALLBACKS == 1)

    /* Init the ADC Callback settings */

    hadc->ConvCpltCallback              = HAL_ADC_ConvCpltCallback;                 /* Legacy weak callback */

    hadc->ConvHalfCpltCallback          = HAL_ADC_ConvHalfCpltCallback;             /* Legacy weak callback */

    hadc->LevelOutOfWindowCallback      = HAL_ADC_LevelOutOfWindowCallback;         /* Legacy weak callback */

    hadc->ErrorCallback                 = HAL_ADC_ErrorCallback;                    /* Legacy weak callback */

    hadc->InjectedConvCpltCallback      = HAL_ADCEx_InjectedConvCpltCallback;       /* Legacy weak callback */

    if (hadc->MspInitCallback == NULL)

    {

      hadc->MspInitCallback = HAL_ADC_MspInit; /* Legacy weak MspInit  */

    }

    /* Init the low level hardware */

    hadc->MspInitCallback(hadc);

#else

    /* Init the low level hardware */

    HAL_ADC_MspInit(hadc);

#endif /* USE_HAL_ADC_REGISTER_CALLBACKS */

  }

  /* Configuration of ADC parameters if previous preliminary actions are      */

  /* correctly completed.                                                     */

  if (HAL_IS_BIT_CLR(hadc->State, HAL_ADC_STATE_ERROR_INTERNAL))

  {

    /* Set ADC state */

    ADC_STATE_CLR_SET(hadc->State,

                      HAL_ADC_STATE_REG_BUSY | HAL_ADC_STATE_INJ_BUSY,

                      HAL_ADC_STATE_BUSY_INTERNAL);

    /* Set ADC parameters */

    /* Configuration of common ADC clock: clock source HSI with selectable    */

    /* prescaler                                                              */

    MODIFY_REG(ADC->CCR                 ,

               ADC_CCR_ADCPRE           ,

               hadc->Init.ClockPrescaler );

    /* Configuration of ADC:                                                  */

    /*  - external trigger polarity                                           */

    /*  - End of conversion selection                                         */

    /*  - DMA continuous request                                              */

    /*  - Channels bank (Banks availability depends on devices categories)    */

    /*  - continuous conversion mode                                          */

    tmp_cr2 |= (hadc->Init.DataAlign                                           |

                hadc->Init.EOCSelection                                        |

                ADC_CR2_DMACONTREQ((uint32_t)hadc->Init.DMAContinuousRequests) |

                hadc->Init.ChannelsBank                                        |

                ADC_CR2_CONTINUOUS((uint32_t)hadc->Init.ContinuousConvMode)     );

    /* Enable external trigger if trigger selection is different of software  */

    /* start.                                                                 */

    /* Note: This configuration keeps the hardware feature of parameter       */

    /*       ExternalTrigConvEdge "trigger edge none" equivalent to           */

    /*       software start.                                                  */

    if (hadc->Init.ExternalTrigConv != ADC_SOFTWARE_START)

    {

      tmp_cr2 |= ( hadc->Init.ExternalTrigConv    |

                  hadc->Init.ExternalTrigConvEdge );

    }

    /* Parameters update conditioned to ADC state:                            */

    /* Parameters that can be updated only when ADC is disabled:              */

    /*  - delay selection (LowPowerAutoWait mode)                             */

    /*  - resolution                                                          */

    /*  - auto power off (LowPowerAutoPowerOff mode)                          */

    /*  - scan mode                                                           */

    /*  - discontinuous mode disable/enable                                   */

    /*  - discontinuous mode number of conversions                            */

    if ((ADC_IS_ENABLE(hadc) == RESET))

    {

      tmp_cr2 |= hadc->Init.LowPowerAutoWait;

      tmp_cr1 |= (hadc->Init.Resolution                     |

                  hadc->Init.LowPowerAutoPowerOff           |

                  ADC_CR1_SCAN_SET(hadc->Init.ScanConvMode)  );

      /* Enable discontinuous mode only if continuous mode is disabled */

      /* Note: If parameter "Init.ScanConvMode" is set to disable, parameter  */

      /*       discontinuous is set anyway, but has no effect on ADC HW.      */

      if (hadc->Init.DiscontinuousConvMode == ENABLE)

      {

        if (hadc->Init.ContinuousConvMode == DISABLE)

        {

          /* Enable the selected ADC regular discontinuous mode */

          /* Set the number of channels to be converted in discontinuous mode */

          SET_BIT(tmp_cr1, ADC_CR1_DISCEN                                            |

                           ADC_CR1_DISCONTINUOUS_NUM(hadc->Init.NbrOfDiscConversion)  );

        }

        else

        {

          /* ADC regular group settings continuous and sequencer discontinuous*/

          /* cannot be enabled simultaneously.                                */

          /* Update ADC state machine to error */

          SET_BIT(hadc->State, HAL_ADC_STATE_ERROR_CONFIG);

          /* Set ADC error code to ADC IP internal error */

          SET_BIT(hadc->ErrorCode, HAL_ADC_ERROR_INTERNAL);

        }

      }

      /* Update ADC configuration register CR1 with previous settings */

        MODIFY_REG(hadc->Instance->CR1,

                   ADC_CR1_RES     |

                   ADC_CR1_PDI     |

                   ADC_CR1_PDD     |

                   ADC_CR1_DISCNUM |

                   ADC_CR1_DISCEN  |

                   ADC_CR1_SCAN     ,

                   tmp_cr1           );

    }

    /* Update ADC configuration register CR2 with previous settings */

    MODIFY_REG(hadc->Instance->CR2    ,

               ADC_CR2_MASK_ADCINIT() ,

               tmp_cr2                 );

    /* Configuration of regular group sequencer:                              */

    /* - if scan mode is disabled, regular channels sequence length is set to */

    /*   0x00: 1 channel converted (channel on regular rank 1)                */

    /*   Parameter "NbrOfConversion" is discarded.                            */

    /*   Note: Scan mode is present by hardware on this device and, if        */

    /*   disabled, discards automatically nb of conversions. Anyway, nb of    */

    /*   conversions is forced to 0x00 for alignment over all STM32 devices.  */

    /* - if scan mode is enabled, regular channels sequence length is set to  */

    /*   parameter "NbrOfConversion"                                          */

    if (ADC_CR1_SCAN_SET(hadc->Init.ScanConvMode) == ADC_SCAN_ENABLE)

    {

      MODIFY_REG(hadc->Instance->SQR1                         ,

                 ADC_SQR1_L                                   ,

                 ADC_SQR1_L_SHIFT(hadc->Init.NbrOfConversion)  );

    }

    else

    {

      MODIFY_REG(hadc->Instance->SQR1,

                 ADC_SQR1_L          ,

                 0x00000000           );

    }

    /* Check back that ADC registers have effectively been configured to      */

    /* ensure of no potential problem of ADC core IP clocking.                */

    /* Check through register CR2 (excluding execution control bits ADON,     */

    /* JSWSTART, SWSTART and injected trigger bits JEXTEN and JEXTSEL).       */

    if ((READ_REG(hadc->Instance->CR2) & ~(ADC_CR2_ADON |

                                           ADC_CR2_SWSTART | ADC_CR2_JSWSTART |

                                           ADC_CR2_JEXTEN  | ADC_CR2_JEXTSEL   ))

         == tmp_cr2)

    {

      /* Set ADC error code to none */

      ADC_CLEAR_ERRORCODE(hadc);

      /* Set the ADC state */

      ADC_STATE_CLR_SET(hadc->State,

                        HAL_ADC_STATE_BUSY_INTERNAL,

                        HAL_ADC_STATE_READY);

    }

    else

    {

      /* Update ADC state machine to error */

      ADC_STATE_CLR_SET(hadc->State,

                        HAL_ADC_STATE_BUSY_INTERNAL,

                        HAL_ADC_STATE_ERROR_INTERNAL);

      /* Set ADC error code to ADC IP internal error */

      SET_BIT(hadc->ErrorCode, HAL_ADC_ERROR_INTERNAL);

      tmp_hal_status = HAL_ERROR;

    }

  }

  else

  {

    tmp_hal_status = HAL_ERROR;

  }

  /* Return function status */

  return tmp_hal_status;

}

/**

  * @brief  Deinitialize the ADC peripheral registers to its default reset values.

  * @note   To not impact other ADCs, reset of common ADC registers have been

  *         left commented below.

  *         If needed, the example code can be copied and uncommented into

  *         function HAL_ADC_MspDeInit().

  * @param  hadc ADC handle

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_ADC_DeInit(ADC_HandleTypeDef* hadc)

{

  HAL_StatusTypeDef tmp_hal_status = HAL_OK;

  /* Check ADC handle */

  if(hadc == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_ADC_ALL_INSTANCE(hadc->Instance));

  /* Set ADC state */

  SET_BIT(hadc->State, HAL_ADC_STATE_BUSY_INTERNAL);

  /* Stop potential conversion on going, on regular and injected groups */

  /* Disable ADC peripheral */

  tmp_hal_status = ADC_ConversionStop_Disable(hadc);

  /* Configuration of ADC parameters if previous preliminary actions are      */

  /* correctly completed.                                                     */

  if (tmp_hal_status == HAL_OK)

  {

    /* ========== Reset ADC registers ========== */

    /* Reset register SR */

    __HAL_ADC_CLEAR_FLAG(hadc, (ADC_FLAG_AWD | ADC_FLAG_JEOC | ADC_FLAG_EOC |

                                ADC_FLAG_JSTRT | ADC_FLAG_STRT));

    /* Reset register CR1 */

    CLEAR_BIT(hadc->Instance->CR1, (ADC_CR1_OVRIE   | ADC_CR1_RES     | ADC_CR1_AWDEN  |

                                    ADC_CR1_JAWDEN  | ADC_CR1_PDI     | ADC_CR1_PDD    |

                                    ADC_CR1_DISCNUM | ADC_CR1_JDISCEN | ADC_CR1_DISCEN |

                                    ADC_CR1_JAUTO   | ADC_CR1_AWDSGL  | ADC_CR1_SCAN   |

                                    ADC_CR1_JEOCIE  | ADC_CR1_AWDIE   | ADC_CR1_EOCIE  |

                                    ADC_CR1_AWDCH                                       ));

    /* Reset register CR2 */

    ADC_CR2_CLEAR(hadc);

    /* Reset register SMPR0 */

    ADC_SMPR0_CLEAR(hadc);

    /* Reset register SMPR1 */

    ADC_SMPR1_CLEAR(hadc);

    /* Reset register SMPR2 */

    CLEAR_BIT(hadc->Instance->SMPR2, (ADC_SMPR2_SMP19 | ADC_SMPR2_SMP18 | ADC_SMPR2_SMP17 |

                                      ADC_SMPR2_SMP16 | ADC_SMPR2_SMP15 | ADC_SMPR2_SMP14 |

                                      ADC_SMPR2_SMP13 | ADC_SMPR2_SMP12 | ADC_SMPR2_SMP11 |

                                      ADC_SMPR2_SMP10                                      ));

    /* Reset register SMPR3 */

    CLEAR_BIT(hadc->Instance->SMPR3, (ADC_SMPR3_SMP9 | ADC_SMPR3_SMP8 | ADC_SMPR3_SMP7 |

                                      ADC_SMPR3_SMP6 | ADC_SMPR3_SMP5 | ADC_SMPR3_SMP4 |

                                      ADC_SMPR3_SMP3 | ADC_SMPR3_SMP2 | ADC_SMPR3_SMP1 |

                                      ADC_SMPR3_SMP0                                    ));

    /* Reset register JOFR1 */

    CLEAR_BIT(hadc->Instance->JOFR1, ADC_JOFR1_JOFFSET1);

    /* Reset register JOFR2 */

    CLEAR_BIT(hadc->Instance->JOFR2, ADC_JOFR2_JOFFSET2);

    /* Reset register JOFR3 */

    CLEAR_BIT(hadc->Instance->JOFR3, ADC_JOFR3_JOFFSET3);

    /* Reset register JOFR4 */

    CLEAR_BIT(hadc->Instance->JOFR4, ADC_JOFR4_JOFFSET4);

    /* Reset register HTR */

    CLEAR_BIT(hadc->Instance->HTR, ADC_HTR_HT);

    /* Reset register LTR */

    CLEAR_BIT(hadc->Instance->LTR, ADC_LTR_LT);

    /* Reset register SQR1 */

    CLEAR_BIT(hadc->Instance->SQR1, (ADC_SQR1_L | __ADC_SQR1_SQXX));

    /* Reset register SQR2 */

    CLEAR_BIT(hadc->Instance->SQR2, (ADC_SQR2_SQ24 | ADC_SQR2_SQ23 | ADC_SQR2_SQ22 |

                                     ADC_SQR2_SQ21 | ADC_SQR2_SQ20 | ADC_SQR2_SQ19  ));

    /* Reset register SQR3 */

    CLEAR_BIT(hadc->Instance->SQR3, (ADC_SQR3_SQ18 | ADC_SQR3_SQ17 | ADC_SQR3_SQ16 |

                                     ADC_SQR3_SQ15 | ADC_SQR3_SQ14 | ADC_SQR3_SQ13  ));

    /* Reset register SQR4 */

    CLEAR_BIT(hadc->Instance->SQR4, (ADC_SQR4_SQ12 | ADC_SQR4_SQ11 | ADC_SQR4_SQ10 |

                                     ADC_SQR4_SQ9  | ADC_SQR4_SQ8  | ADC_SQR4_SQ7   ));

    /* Reset register SQR5 */

    CLEAR_BIT(hadc->Instance->SQR5, (ADC_SQR5_SQ6 | ADC_SQR5_SQ5 | ADC_SQR5_SQ4 |

                                     ADC_SQR5_SQ3 | ADC_SQR5_SQ2 | ADC_SQR5_SQ1  ));

    /* Reset register JSQR */

    CLEAR_BIT(hadc->Instance->JSQR, (ADC_JSQR_JL |

                                     ADC_JSQR_JSQ4 | ADC_JSQR_JSQ3 |

                                     ADC_JSQR_JSQ2 | ADC_JSQR_JSQ1  ));

    /* Reset register DR */

    /* bits in access mode read only, no direct reset applicable*/

    /* Reset registers JDR1, JDR2, JDR3, JDR4 */

    /* bits in access mode read only, no direct reset applicable*/

    /* Reset register CCR */

    CLEAR_BIT(ADC->CCR, ADC_CCR_TSVREFE);  

    /* ========== Hard reset ADC peripheral ========== */

    /* Performs a global reset of the entire ADC peripheral: ADC state is     */

    /* forced to a similar state after device power-on.                       */

    /* If needed, copy-paste and uncomment the following reset code into      */

    /* function "void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)":              */

    /*                                                                        */

    /*  __HAL_RCC_ADC1_FORCE_RESET()                                          */

    /*  __HAL_RCC_ADC1_RELEASE_RESET()                                        */

#if (USE_HAL_ADC_REGISTER_CALLBACKS == 1)

    if (hadc->MspDeInitCallback == NULL)

    {

      hadc->MspDeInitCallback = HAL_ADC_MspDeInit; /* Legacy weak MspDeInit  */

    }

    /* DeInit the low level hardware */

    hadc->MspDeInitCallback(hadc);

#else

    /* DeInit the low level hardware */

    HAL_ADC_MspDeInit(hadc);

#endif /* USE_HAL_ADC_REGISTER_CALLBACKS */

    /* Set ADC error code to none */

    ADC_CLEAR_ERRORCODE(hadc);

    /* Set ADC state */

    hadc->State = HAL_ADC_STATE_RESET;

  }

  /* Process unlocked */

  __HAL_UNLOCK(hadc);

  /* Return function status */

  return tmp_hal_status;

}

/**

  * @brief  Initializes the ADC MSP.

  * @param  hadc ADC handle

  * @retval None

  */

__weak void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)

{

  /* Prevent unused argument(s) compilation warning */

  UNUSED(hadc);

  /* NOTE : This function should not be modified. When the callback is needed,

            function HAL_ADC_MspInit must be implemented in the user file.

   */

}

/**

  * @brief  DeInitializes the ADC MSP.

  * @param  hadc ADC handle

  * @retval None

  */

__weak void HAL_ADC_MspDeInit(ADC_HandleTypeDef* hadc)

{

  /* Prevent unused argument(s) compilation warning */

  UNUSED(hadc);

  /* NOTE : This function should not be modified. When the callback is needed,

            function HAL_ADC_MspDeInit must be implemented in the user file.

   */

}

#if (USE_HAL_ADC_REGISTER_CALLBACKS == 1)

/**

  * @brief  Register a User ADC Callback

  *         To be used instead of the weak predefined callback

  * @param  hadc Pointer to a ADC_HandleTypeDef structure that contains

  *                the configuration information for the specified ADC.

  * @param  CallbackID ID of the callback to be registered

  *         This parameter can be one of the following values:

  *          @arg @ref HAL_ADC_CONVERSION_COMPLETE_CB_ID      ADC conversion complete callback ID

  *          @arg @ref HAL_ADC_CONVERSION_HALF_CB_ID          ADC conversion complete callback ID

  *          @arg @ref HAL_ADC_LEVEL_OUT_OF_WINDOW_1_CB_ID    ADC analog watchdog 1 callback ID

  *          @arg @ref HAL_ADC_ERROR_CB_ID                    ADC error callback ID

  *          @arg @ref HAL_ADC_INJ_CONVERSION_COMPLETE_CB_ID  ADC group injected conversion complete callback ID

  *          @arg @ref HAL_ADC_MSPINIT_CB_ID                  ADC Msp Init callback ID

  *          @arg @ref HAL_ADC_MSPDEINIT_CB_ID                ADC Msp DeInit callback ID

  *          @arg @ref HAL_ADC_MSPINIT_CB_ID MspInit callback ID

  *          @arg @ref HAL_ADC_MSPDEINIT_CB_ID MspDeInit callback ID

  * @param  pCallback pointer to the Callback function

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_ADC_RegisterCallback(ADC_HandleTypeDef *hadc, HAL_ADC_CallbackIDTypeDef CallbackID, pADC_CallbackTypeDef pCallback)

{

  HAL_StatusTypeDef status = HAL_OK;

  if (pCallback == NULL)

  {

    /* Update the error code */

    hadc->ErrorCode |= HAL_ADC_ERROR_INVALID_CALLBACK;

    return HAL_ERROR;

  }

  if ((hadc->State & HAL_ADC_STATE_READY) != 0)

  {

    switch (CallbackID)

    {

      case HAL_ADC_CONVERSION_COMPLETE_CB_ID :

        hadc->ConvCpltCallback = pCallback;

        break;

      case HAL_ADC_CONVERSION_HALF_CB_ID :

        hadc->ConvHalfCpltCallback = pCallback;

        break;

      case HAL_ADC_LEVEL_OUT_OF_WINDOW_1_CB_ID :

        hadc->LevelOutOfWindowCallback = pCallback;

        break;

      case HAL_ADC_ERROR_CB_ID :

        hadc->ErrorCallback = pCallback;

        break;

      case HAL_ADC_INJ_CONVERSION_COMPLETE_CB_ID :

        hadc->InjectedConvCpltCallback = pCallback;

        break;

      case HAL_ADC_MSPINIT_CB_ID :

        hadc->MspInitCallback = pCallback;

        break;

      case HAL_ADC_MSPDEINIT_CB_ID :

        hadc->MspDeInitCallback = pCallback;

        break;

      default :

        /* Update the error code */

        hadc->ErrorCode |= HAL_ADC_ERROR_INVALID_CALLBACK;

        /* Return error status */

        status = HAL_ERROR;

        break;

    }

  }

  else if (HAL_ADC_STATE_RESET == hadc->State)

  {