Src/stm32l0xx_hal_tsc.c

/**
  ******************************************************************************
  * @file    stm32l0xx_hal_tsc.c
  * @author  MCD Application Team
  * @brief   This file provides firmware functions to manage the following
  *          functionalities of the Touch Sensing Controller (TSC) peripheral:
  *           + Initialization and De-initialization
  *           + Channel IOs, Shield IOs and Sampling IOs configuration
  *           + Start and Stop an acquisition
  *           + Read acquisition result
  *           + Interrupts and flags management
  *
  @verbatim
================================================================================
                       ##### TSC specific features #####
================================================================================
  [..]
  (#) Proven and robust surface charge transfer acquisition principle

  (#) Supports up to 3 capacitive sensing channels per group

  (#) Capacitive sensing channels can be acquired in parallel offering a very good
      response time

  (#) Spread spectrum feature to improve system robustness in noisy environments

  (#) Full hardware management of the charge transfer acquisition sequence

  (#) Programmable charge transfer frequency

  (#) Programmable sampling capacitor I/O pin

  (#) Programmable channel I/O pin

  (#) Programmable max count value to avoid long acquisition when a channel is faulty

  (#) Dedicated end of acquisition and max count error flags with interrupt capability

  (#) One sampling capacitor for up to 3 capacitive sensing channels to reduce the system
      components

  (#) Compatible with proximity, touchkey, linear and rotary touch sensor implementation

                          ##### How to use this driver #####
================================================================================
  [..]
    (#) Enable the TSC interface clock using __HAL_RCC_TSC_CLK_ENABLE() macro.

    (#) GPIO pins configuration
      (++) Enable the clock for the TSC GPIOs using __HAL_RCC_GPIOx_CLK_ENABLE() macro.
      (++) Configure the TSC pins used as sampling IOs in alternate function output Open-Drain mode,
           and TSC pins used as channel/shield IOs in alternate function output Push-Pull mode
           using HAL_GPIO_Init() function.

    (#) Interrupts configuration
      (++) Configure the NVIC (if the interrupt model is used) using HAL_NVIC_SetPriority()
           and HAL_NVIC_EnableIRQ() and function.

    (#) TSC configuration
      (++) Configure all TSC parameters and used TSC IOs using HAL_TSC_Init() function.

 [..]   TSC peripheral alternate functions are mapped on AF3.

  *** Acquisition sequence ***
  ===================================
  [..]
    (+) Discharge all IOs using HAL_TSC_IODischarge() function.
    (+) Wait a certain time allowing a good discharge of all capacitors. This delay depends
        of the sampling capacitor and electrodes design.
    (+) Select the channel IOs to be acquired using HAL_TSC_IOConfig() function.
    (+) Launch the acquisition using either HAL_TSC_Start() or HAL_TSC_Start_IT() function.
        If the synchronized mode is selected, the acquisition will start as soon as the signal
        is received on the synchro pin.
    (+) Wait the end of acquisition using either HAL_TSC_PollForAcquisition() or
        HAL_TSC_GetState() function or using WFI instruction for example.
    (+) Check the group acquisition status using HAL_TSC_GroupGetStatus() function.
    (+) Read the acquisition value using HAL_TSC_GroupGetValue() function.

     *** Callback registration ***
     =============================================

  [..]
     The compilation flag USE_HAL_TSC_REGISTER_CALLBACKS when set to 1
     allows the user to configure dynamically the driver callbacks.
     Use Functions @ref HAL_TSC_RegisterCallback() to register an interrupt callback.

  [..]
     Function @ref HAL_TSC_RegisterCallback() allows to register following callbacks:
       (+) ConvCpltCallback   : callback for conversion complete process.
       (+) ErrorCallback      : callback for error detection.
       (+) MspInitCallback    : callback for Msp Init.
       (+) MspDeInitCallback  : callback for Msp DeInit.
  [..]
     This function takes as parameters the HAL peripheral handle, the Callback ID
     and a pointer to the user callback function.

  [..]
     Use function @ref HAL_TSC_UnRegisterCallback to reset a callback to the default
     weak function.
     @ref HAL_TSC_UnRegisterCallback takes as parameters the HAL peripheral handle,
     and the Callback ID.
  [..]
     This function allows to reset following callbacks:
       (+) ConvCpltCallback   : callback for conversion complete process.
       (+) ErrorCallback      : callback for error detection.
       (+) MspInitCallback    : callback for Msp Init.
       (+) MspDeInitCallback  : callback for Msp DeInit.

  [..]
     By default, after the @ref HAL_TSC_Init() and when the state is @ref HAL_TSC_STATE_RESET
     all callbacks are set to the corresponding weak functions:
     examples @ref HAL_TSC_ConvCpltCallback(), @ref HAL_TSC_ErrorCallback().
     Exception done for MspInit and MspDeInit functions that are
     reset to the legacy weak functions in the @ref HAL_TSC_Init()/ @ref HAL_TSC_DeInit() only when
     these callbacks are null (not registered beforehand).
     If MspInit or MspDeInit are not null, the @ref HAL_TSC_Init()/ @ref HAL_TSC_DeInit()
     keep and use the user MspInit/MspDeInit callbacks (registered beforehand) whatever the state.

  [..]
     Callbacks can be registered/unregistered in @ref HAL_TSC_STATE_READY state only.
     Exception done MspInit/MspDeInit functions that can be registered/unregistered
     in @ref HAL_TSC_STATE_READY or @ref HAL_TSC_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_TSC_RegisterCallback() before calling @ref HAL_TSC_DeInit()
     or @ref HAL_TSC_Init() function.

  [..]
     When the compilation flag USE_HAL_TSC_REGISTER_CALLBACKS is set to 0 or
     not defined, the callback registration feature is not available and all callbacks
     are set to the corresponding weak functions.

  @endverbatim
  ******************************************************************************
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32l0xx_hal.h"

#if defined(TSC)
/** @addtogroup STM32L0xx_HAL_Driver
  * @{
  */

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

#ifdef HAL_TSC_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static uint32_t TSC_extract_groups(uint32_t iomask);

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

/** @defgroup TSC_Exported_Functions TSC Exported Functions
  * @{
  */

/** @defgroup TSC_Exported_Functions_Group1 Initialization and de-initialization functions
 *  @brief    Initialization and Configuration functions
 *
@verbatim
 ===============================================================================
              ##### Initialization and de-initialization functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Initialize and configure the TSC.
      (+) De-initialize the TSC.
@endverbatim
  * @{
  */

/**
  * @brief  Initialize the TSC peripheral according to the specified parameters
  *         in the TSC_InitTypeDef structure and initialize the associated handle.
  * @param  htsc TSC handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_Init(TSC_HandleTypeDef *htsc)
{
  /* Check TSC handle allocation */
  if (htsc == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));
  assert_param(IS_TSC_CTPH(htsc->Init.CTPulseHighLength));
  assert_param(IS_TSC_CTPL(htsc->Init.CTPulseLowLength));
  assert_param(IS_TSC_SS(htsc->Init.SpreadSpectrum));
  assert_param(IS_TSC_SSD(htsc->Init.SpreadSpectrumDeviation));
  assert_param(IS_TSC_SS_PRESC(htsc->Init.SpreadSpectrumPrescaler));
  assert_param(IS_TSC_PG_PRESC(htsc->Init.PulseGeneratorPrescaler));
  assert_param(IS_TSC_PG_PRESC_VS_CTPL(htsc->Init.PulseGeneratorPrescaler, htsc->Init.CTPulseLowLength));
  assert_param(IS_TSC_MCV(htsc->Init.MaxCountValue));
  assert_param(IS_TSC_IODEF(htsc->Init.IODefaultMode));
  assert_param(IS_TSC_SYNC_POL(htsc->Init.SynchroPinPolarity));
  assert_param(IS_TSC_ACQ_MODE(htsc->Init.AcquisitionMode));
  assert_param(IS_TSC_MCE_IT(htsc->Init.MaxCountInterrupt));
  assert_param(IS_TSC_GROUP(htsc->Init.ChannelIOs));
  assert_param(IS_TSC_GROUP(htsc->Init.ShieldIOs));
  assert_param(IS_TSC_GROUP(htsc->Init.SamplingIOs));

  if (htsc->State == HAL_TSC_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    htsc->Lock = HAL_UNLOCKED;

#if (USE_HAL_TSC_REGISTER_CALLBACKS == 1)
    /* Init the TSC Callback settings */
    htsc->ConvCpltCallback  = HAL_TSC_ConvCpltCallback; /* Legacy weak ConvCpltCallback     */
    htsc->ErrorCallback     = HAL_TSC_ErrorCallback;    /* Legacy weak ErrorCallback        */

    if (htsc->MspInitCallback == NULL)
    {
      htsc->MspInitCallback = HAL_TSC_MspInit; /* Legacy weak MspInit  */
    }

    /* Init the low level hardware : GPIO, CLOCK, CORTEX...etc */
    htsc->MspInitCallback(htsc);
#else
    /* Init the low level hardware : GPIO, CLOCK, CORTEX */
    HAL_TSC_MspInit(htsc);
#endif /* USE_HAL_TSC_REGISTER_CALLBACKS */
  }

  /* Initialize the TSC state */
  htsc->State = HAL_TSC_STATE_BUSY;

  /*--------------------------------------------------------------------------*/
  /* Set TSC parameters */

  /* Enable TSC */
  htsc->Instance->CR = TSC_CR_TSCE;

  /* Set all functions */
  htsc->Instance->CR |= (htsc->Init.CTPulseHighLength |
                         htsc->Init.CTPulseLowLength |
                         (htsc->Init.SpreadSpectrumDeviation << TSC_CR_SSD_Pos) |
                         htsc->Init.SpreadSpectrumPrescaler |
                         htsc->Init.PulseGeneratorPrescaler |
                         htsc->Init.MaxCountValue |
                         htsc->Init.SynchroPinPolarity |
                         htsc->Init.AcquisitionMode);

  /* Spread spectrum */
  if (htsc->Init.SpreadSpectrum == ENABLE)
  {
    htsc->Instance->CR |= TSC_CR_SSE;
  }

  /* Disable Schmitt trigger hysteresis on all used TSC IOs */
  htsc->Instance->IOHCR = (~(htsc->Init.ChannelIOs | htsc->Init.ShieldIOs | htsc->Init.SamplingIOs));

  /* Set channel and shield IOs */
  htsc->Instance->IOCCR = (htsc->Init.ChannelIOs | htsc->Init.ShieldIOs);

  /* Set sampling IOs */
  htsc->Instance->IOSCR = htsc->Init.SamplingIOs;

  /* Set the groups to be acquired */
  htsc->Instance->IOGCSR = TSC_extract_groups(htsc->Init.ChannelIOs);

  /* Disable interrupts */
  htsc->Instance->IER &= (~(TSC_IT_EOA | TSC_IT_MCE));

  /* Clear flags */
  htsc->Instance->ICR = (TSC_FLAG_EOA | TSC_FLAG_MCE);

  /*--------------------------------------------------------------------------*/

  /* Initialize the TSC state */
  htsc->State = HAL_TSC_STATE_READY;

  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Deinitialize the TSC peripheral registers to their default reset values.
  * @param  htsc TSC handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_DeInit(TSC_HandleTypeDef *htsc)
{
  /* Check TSC handle allocation */
  if (htsc == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));

  /* Change TSC state */
  htsc->State = HAL_TSC_STATE_BUSY;

#if (USE_HAL_TSC_REGISTER_CALLBACKS == 1)
  if (htsc->MspDeInitCallback == NULL)
  {
    htsc->MspDeInitCallback = HAL_TSC_MspDeInit; /* Legacy weak MspDeInit  */
  }

  /* DeInit the low level hardware: GPIO, CLOCK, NVIC */
  htsc->MspDeInitCallback(htsc);
#else
  /* DeInit the low level hardware */
  HAL_TSC_MspDeInit(htsc);
#endif /* USE_HAL_TSC_REGISTER_CALLBACKS */

  /* Change TSC state */
  htsc->State = HAL_TSC_STATE_RESET;

  /* Process unlocked */
  __HAL_UNLOCK(htsc);

  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Initialize the TSC MSP.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval None
  */
__weak void HAL_TSC_MspInit(TSC_HandleTypeDef *htsc)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(htsc);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_TSC_MspInit could be implemented in the user file.
   */
}

/**
  * @brief  DeInitialize the TSC MSP.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval None
  */
__weak void HAL_TSC_MspDeInit(TSC_HandleTypeDef *htsc)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(htsc);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_TSC_MspDeInit could be implemented in the user file.
   */
}

#if (USE_HAL_TSC_REGISTER_CALLBACKS == 1)
/**
  * @brief  Register a User TSC Callback
  *         To be used instead of the weak predefined callback
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *                the configuration information for the specified TSC.
  * @param  CallbackID ID of the callback to be registered
  *         This parameter can be one of the following values:
  *          @arg @ref HAL_TSC_CONV_COMPLETE_CB_ID Conversion completed callback ID
  *          @arg @ref HAL_TSC_ERROR_CB_ID Error callback ID
  *          @arg @ref HAL_TSC_MSPINIT_CB_ID MspInit callback ID
  *          @arg @ref HAL_TSC_MSPDEINIT_CB_ID MspDeInit callback ID
  * @param  pCallback pointer to the Callback function
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_RegisterCallback(TSC_HandleTypeDef *htsc, HAL_TSC_CallbackIDTypeDef CallbackID,
                                           pTSC_CallbackTypeDef pCallback)
{
  HAL_StatusTypeDef status = HAL_OK;

  if (pCallback == NULL)
  {
    /* Update the error code */
    htsc->ErrorCode |= HAL_TSC_ERROR_INVALID_CALLBACK;

    return HAL_ERROR;
  }
  /* Process locked */
  __HAL_LOCK(htsc);

  if (HAL_TSC_STATE_READY == htsc->State)
  {
    switch (CallbackID)
    {
      case HAL_TSC_CONV_COMPLETE_CB_ID :
        htsc->ConvCpltCallback = pCallback;
        break;

      case HAL_TSC_ERROR_CB_ID :
        htsc->ErrorCallback = pCallback;
        break;

      case HAL_TSC_MSPINIT_CB_ID :
        htsc->MspInitCallback = pCallback;
        break;

      case HAL_TSC_MSPDEINIT_CB_ID :
        htsc->MspDeInitCallback = pCallback;
        break;

      default :
        /* Update the error code */
        htsc->ErrorCode |= HAL_TSC_ERROR_INVALID_CALLBACK;

        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else if (HAL_TSC_STATE_RESET == htsc->State)
  {
    switch (CallbackID)
    {
      case HAL_TSC_MSPINIT_CB_ID :
        htsc->MspInitCallback = pCallback;
        break;

      case HAL_TSC_MSPDEINIT_CB_ID :
        htsc->MspDeInitCallback = pCallback;
        break;

      default :
        /* Update the error code */
        htsc->ErrorCode |= HAL_TSC_ERROR_INVALID_CALLBACK;

        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else
  {
    /* Update the error code */
    htsc->ErrorCode |= HAL_TSC_ERROR_INVALID_CALLBACK;

    /* Return error status */
    status =  HAL_ERROR;
  }

  /* Release Lock */
  __HAL_UNLOCK(htsc);
  return status;
}

/**
  * @brief  Unregister an TSC Callback
  *         TSC callback is redirected to the weak predefined callback
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *                the configuration information for the specified TSC.
  * @param  CallbackID ID of the callback to be unregistered
  *         This parameter can be one of the following values:
  *         This parameter can be one of the following values:
  *          @arg @ref HAL_TSC_CONV_COMPLETE_CB_ID Conversion completed callback ID
  *          @arg @ref HAL_TSC_ERROR_CB_ID Error callback ID
  *          @arg @ref HAL_TSC_MSPINIT_CB_ID MspInit callback ID
  *          @arg @ref HAL_TSC_MSPDEINIT_CB_ID MspDeInit callback ID
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_UnRegisterCallback(TSC_HandleTypeDef *htsc, HAL_TSC_CallbackIDTypeDef CallbackID)
{
  HAL_StatusTypeDef status = HAL_OK;

  /* Process locked */
  __HAL_LOCK(htsc);

  if (HAL_TSC_STATE_READY == htsc->State)
  {
    switch (CallbackID)
    {
      case HAL_TSC_CONV_COMPLETE_CB_ID :
        htsc->ConvCpltCallback = HAL_TSC_ConvCpltCallback;       /* Legacy weak ConvCpltCallback      */
        break;

      case HAL_TSC_ERROR_CB_ID :
        htsc->ErrorCallback = HAL_TSC_ErrorCallback;               /* Legacy weak ErrorCallback        */
        break;

      case HAL_TSC_MSPINIT_CB_ID :
        htsc->MspInitCallback = HAL_TSC_MspInit;                   /* Legacy weak MspInit              */
        break;

      case HAL_TSC_MSPDEINIT_CB_ID :
        htsc->MspDeInitCallback = HAL_TSC_MspDeInit;               /* Legacy weak MspDeInit            */
        break;

      default :
        /* Update the error code */
        htsc->ErrorCode |= HAL_TSC_ERROR_INVALID_CALLBACK;

        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else if (HAL_TSC_STATE_RESET == htsc->State)
  {
    switch (CallbackID)
    {
      case HAL_TSC_MSPINIT_CB_ID :
        htsc->MspInitCallback = HAL_TSC_MspInit;                   /* Legacy weak MspInit              */
        break;

      case HAL_TSC_MSPDEINIT_CB_ID :
        htsc->MspDeInitCallback = HAL_TSC_MspDeInit;               /* Legacy weak MspDeInit            */
        break;

      default :
        /* Update the error code */
        htsc->ErrorCode |= HAL_TSC_ERROR_INVALID_CALLBACK;

        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else
  {
    /* Update the error code */
    htsc->ErrorCode |= HAL_TSC_ERROR_INVALID_CALLBACK;

    /* Return error status */
    status =  HAL_ERROR;
  }

  /* Release Lock */
  __HAL_UNLOCK(htsc);
  return status;
}

#endif /* USE_HAL_TSC_REGISTER_CALLBACKS */

/**
  * @}
  */

/** @defgroup TSC_Exported_Functions_Group2 Input and Output operation functions
 *  @brief    Input and Output operation functions
 *
@verbatim
 ===============================================================================
             ##### IO Operation functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Start acquisition in polling mode.
      (+) Start acquisition in interrupt mode.
      (+) Stop conversion in polling mode.
      (+) Stop conversion in interrupt mode.
      (+) Poll for acquisition completed.
      (+) Get group acquisition status.
      (+) Get group acquisition value.
@endverbatim
  * @{
  */

/**
  * @brief  Start the acquisition.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_Start(TSC_HandleTypeDef *htsc)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));

  /* Process locked */
  __HAL_LOCK(htsc);

  /* Change TSC state */
  htsc->State = HAL_TSC_STATE_BUSY;

  /* Clear interrupts */
  __HAL_TSC_DISABLE_IT(htsc, (TSC_IT_EOA | TSC_IT_MCE));

  /* Clear flags */
  __HAL_TSC_CLEAR_FLAG(htsc, (TSC_FLAG_EOA | TSC_FLAG_MCE));

  /* Set touch sensing IOs not acquired to the specified IODefaultMode */
  if (htsc->Init.IODefaultMode == TSC_IODEF_OUT_PP_LOW)
  {
    __HAL_TSC_SET_IODEF_OUTPPLOW(htsc);
  }
  else
  {
    __HAL_TSC_SET_IODEF_INFLOAT(htsc);
  }

  /* Launch the acquisition */
  __HAL_TSC_START_ACQ(htsc);

  /* Process unlocked */
  __HAL_UNLOCK(htsc);

  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Start the acquisition in interrupt mode.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval HAL status.
  */
HAL_StatusTypeDef HAL_TSC_Start_IT(TSC_HandleTypeDef *htsc)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));
  assert_param(IS_TSC_MCE_IT(htsc->Init.MaxCountInterrupt));

  /* Process locked */
  __HAL_LOCK(htsc);

  /* Change TSC state */
  htsc->State = HAL_TSC_STATE_BUSY;

  /* Enable end of acquisition interrupt */
  __HAL_TSC_ENABLE_IT(htsc, TSC_IT_EOA);

  /* Enable max count error interrupt (optional) */
  if (htsc->Init.MaxCountInterrupt == ENABLE)
  {
    __HAL_TSC_ENABLE_IT(htsc, TSC_IT_MCE);
  }
  else
  {
    __HAL_TSC_DISABLE_IT(htsc, TSC_IT_MCE);
  }

  /* Clear flags */
  __HAL_TSC_CLEAR_FLAG(htsc, (TSC_FLAG_EOA | TSC_FLAG_MCE));

  /* Set touch sensing IOs not acquired to the specified IODefaultMode */
  if (htsc->Init.IODefaultMode == TSC_IODEF_OUT_PP_LOW)
  {
    __HAL_TSC_SET_IODEF_OUTPPLOW(htsc);
  }
  else
  {
    __HAL_TSC_SET_IODEF_INFLOAT(htsc);
  }

  /* Launch the acquisition */
  __HAL_TSC_START_ACQ(htsc);

  /* Process unlocked */
  __HAL_UNLOCK(htsc);

  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Stop the acquisition previously launched in polling mode.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_Stop(TSC_HandleTypeDef *htsc)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));

  /* Process locked */
  __HAL_LOCK(htsc);

  /* Stop the acquisition */
  __HAL_TSC_STOP_ACQ(htsc);

  /* Set touch sensing IOs in low power mode (output push-pull) */
  __HAL_TSC_SET_IODEF_OUTPPLOW(htsc);

  /* Clear flags */
  __HAL_TSC_CLEAR_FLAG(htsc, (TSC_FLAG_EOA | TSC_FLAG_MCE));

  /* Change TSC state */
  htsc->State = HAL_TSC_STATE_READY;

  /* Process unlocked */
  __HAL_UNLOCK(htsc);

  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Stop the acquisition previously launched in interrupt mode.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_Stop_IT(TSC_HandleTypeDef *htsc)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));

  /* Process locked */
  __HAL_LOCK(htsc);

  /* Stop the acquisition */
  __HAL_TSC_STOP_ACQ(htsc);

  /* Set touch sensing IOs in low power mode (output push-pull) */
  __HAL_TSC_SET_IODEF_OUTPPLOW(htsc);

  /* Disable interrupts */
  __HAL_TSC_DISABLE_IT(htsc, (TSC_IT_EOA | TSC_IT_MCE));

  /* Clear flags */
  __HAL_TSC_CLEAR_FLAG(htsc, (TSC_FLAG_EOA | TSC_FLAG_MCE));

  /* Change TSC state */
  htsc->State = HAL_TSC_STATE_READY;

  /* Process unlocked */
  __HAL_UNLOCK(htsc);

  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Start acquisition and wait until completion.
  * @note   There is no need of a timeout parameter as the max count error is already
  *         managed by the TSC peripheral.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval HAL state
  */
HAL_StatusTypeDef HAL_TSC_PollForAcquisition(TSC_HandleTypeDef *htsc)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));

  /* Process locked */
  __HAL_LOCK(htsc);

  /* Check end of acquisition */
  while (HAL_TSC_GetState(htsc) == HAL_TSC_STATE_BUSY)
  {
    /* The timeout (max count error) is managed by the TSC peripheral itself. */
  }

  /* Process unlocked */
  __HAL_UNLOCK(htsc);

  return HAL_OK;
}

/**
  * @brief  Get the acquisition status for a group.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @param  gx_index Index of the group
  * @retval Group status
  */
TSC_GroupStatusTypeDef HAL_TSC_GroupGetStatus(TSC_HandleTypeDef *htsc, uint32_t gx_index)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));
  assert_param(IS_TSC_GROUP_INDEX(gx_index));

  /* Return the group status */
  return (__HAL_TSC_GET_GROUP_STATUS(htsc, gx_index));
}

/**
  * @brief  Get the acquisition measure for a group.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @param  gx_index Index of the group
  * @retval Acquisition measure
  */
uint32_t HAL_TSC_GroupGetValue(TSC_HandleTypeDef *htsc, uint32_t gx_index)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));
  assert_param(IS_TSC_GROUP_INDEX(gx_index));

  /* Return the group acquisition counter */
  return htsc->Instance->IOGXCR[gx_index];
}

/**
  * @}
  */

/** @defgroup TSC_Exported_Functions_Group3 Peripheral Control functions
 *  @brief    Peripheral Control functions
 *
@verbatim
 ===============================================================================
             ##### Peripheral Control functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Configure TSC IOs
      (+) Discharge TSC IOs
@endverbatim
  * @{
  */

/**
  * @brief  Configure TSC IOs.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @param  config Pointer to the configuration structure.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_IOConfig(TSC_HandleTypeDef *htsc, TSC_IOConfigTypeDef *config)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));
  assert_param(IS_TSC_GROUP(config->ChannelIOs));
  assert_param(IS_TSC_GROUP(config->ShieldIOs));
  assert_param(IS_TSC_GROUP(config->SamplingIOs));

  /* Process locked */
  __HAL_LOCK(htsc);

  /* Stop acquisition */
  __HAL_TSC_STOP_ACQ(htsc);

  /* Disable Schmitt trigger hysteresis on all used TSC IOs */
  htsc->Instance->IOHCR = (~(config->ChannelIOs | config->ShieldIOs | config->SamplingIOs));

  /* Set channel and shield IOs */
  htsc->Instance->IOCCR = (config->ChannelIOs | config->ShieldIOs);

  /* Set sampling IOs */
  htsc->Instance->IOSCR = config->SamplingIOs;

  /* Set groups to be acquired */
  htsc->Instance->IOGCSR = TSC_extract_groups(config->ChannelIOs);

  /* Process unlocked */
  __HAL_UNLOCK(htsc);

  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Discharge TSC IOs.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @param  choice This parameter can be set to ENABLE or DISABLE.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_IODischarge(TSC_HandleTypeDef *htsc, FunctionalState choice)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));

  /* Process locked */
  __HAL_LOCK(htsc);

  if (choice == ENABLE)
  {
    __HAL_TSC_SET_IODEF_OUTPPLOW(htsc);
  }
  else
  {
    __HAL_TSC_SET_IODEF_INFLOAT(htsc);
  }

  /* Process unlocked */
  __HAL_UNLOCK(htsc);

  /* Return the group acquisition counter */
  return HAL_OK;
}

/**
  * @}
  */

/** @defgroup TSC_Exported_Functions_Group4 Peripheral State and Errors functions
 *  @brief   Peripheral State and Errors functions
 *
@verbatim
 ===============================================================================
            ##### State and Errors functions #####
 ===============================================================================
    [..]
    This subsection provides functions allowing to
      (+) Get TSC state.

@endverbatim
  * @{
  */

/**
  * @brief  Return the TSC handle state.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval HAL state
  */
HAL_TSC_StateTypeDef HAL_TSC_GetState(TSC_HandleTypeDef *htsc)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));

  if (htsc->State == HAL_TSC_STATE_BUSY)
  {
    /* Check end of acquisition flag */
    if (__HAL_TSC_GET_FLAG(htsc, TSC_FLAG_EOA) != RESET)
    {
      /* Check max count error flag */
      if (__HAL_TSC_GET_FLAG(htsc, TSC_FLAG_MCE) != RESET)
      {
        /* Change TSC state */
        htsc->State = HAL_TSC_STATE_ERROR;
      }
      else
      {
        /* Change TSC state */
        htsc->State = HAL_TSC_STATE_READY;
      }
    }
  }

  /* Return TSC state */
  return htsc->State;
}

/**
  * @}
  */

/** @defgroup TSC_IRQ_Handler_and_Callbacks IRQ Handler and Callbacks
 * @{
 */

/**
  * @brief  Handle TSC interrupt request.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval None
  */
void HAL_TSC_IRQHandler(TSC_HandleTypeDef *htsc)
{
  /* Check the parameters */
  assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));

  /* Check if the end of acquisition occurred */
  if (__HAL_TSC_GET_FLAG(htsc, TSC_FLAG_EOA) != RESET)
  {
    /* Clear EOA flag */
    __HAL_TSC_CLEAR_FLAG(htsc, TSC_FLAG_EOA);
  }

  /* Check if max count error occurred */
  if (__HAL_TSC_GET_FLAG(htsc, TSC_FLAG_MCE) != RESET)
  {
    /* Clear MCE flag */
    __HAL_TSC_CLEAR_FLAG(htsc, TSC_FLAG_MCE);
    /* Change TSC state */
    htsc->State = HAL_TSC_STATE_ERROR;
#if (USE_HAL_TSC_REGISTER_CALLBACKS == 1)
    htsc->ErrorCallback(htsc);
#else
    /* Conversion completed callback */
    HAL_TSC_ErrorCallback(htsc);
#endif /* USE_HAL_TSC_REGISTER_CALLBACKS */
  }
  else
  {
    /* Change TSC state */
    htsc->State = HAL_TSC_STATE_READY;
#if (USE_HAL_TSC_REGISTER_CALLBACKS == 1)
    htsc->ConvCpltCallback(htsc);
#else
    /* Conversion completed callback */
    HAL_TSC_ConvCpltCallback(htsc);
#endif /* USE_HAL_TSC_REGISTER_CALLBACKS */
  }
}

/**
  * @brief  Acquisition completed callback in non-blocking mode.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval None
  */
__weak void HAL_TSC_ConvCpltCallback(TSC_HandleTypeDef *htsc)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(htsc);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_TSC_ConvCpltCallback could be implemented in the user file.
   */
}

/**
  * @brief  Error callback in non-blocking mode.
  * @param  htsc Pointer to a TSC_HandleTypeDef structure that contains
  *         the configuration information for the specified TSC.
  * @retval None
  */
__weak void HAL_TSC_ErrorCallback(TSC_HandleTypeDef *htsc)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(htsc);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_TSC_ErrorCallback could be implemented in the user file.
   */
}

/**
  * @}
  */

/**
  * @}
  */

/* Private functions ---------------------------------------------------------*/
/** @defgroup TSC_Private_Functions TSC Private Functions
  * @{
  */

/**
  * @brief  Utility function used to set the acquired groups mask.
  * @param  iomask Channels IOs mask
  * @retval Acquired groups mask
  */
static uint32_t TSC_extract_groups(uint32_t iomask)
{
  uint32_t groups = 0UL;
  uint32_t idx;

  for (idx = 0UL; idx < (uint32_t)TSC_NB_OF_GROUPS; idx++)
  {
    if ((iomask & (0x0FUL << (idx * 4UL))) != 0UL )
    {
      groups |= (1UL << idx);
    }
  }

  return groups;
}

/**
  * @}
  */

#endif /* HAL_TSC_MODULE_ENABLED */

/**
  * @}
  */

/**
  * @}
  */

#endif /* TSC */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/