rt-thread/bsp/stm32l475-iot-disco/Libraries/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_tsc.c

/**
  ******************************************************************************
  * @file    stm32l4xx_hal_tsc.c
  * @author  MCD Application Team
  * @version V1.7.2
  * @date    16-June-2017
  * @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 AF9.
 
  *** 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.
      
  @endverbatim
  ******************************************************************************

    Table 1. IOs for the STM32L4xx devices
    +--------------------------------+     
    |       IOs    |   TSC functions | 
    |--------------|-----------------|
    |   PB12 (AF)  |   TSC_G1_IO1    | 
    |   PB13 (AF)  |   TSC_G1_IO2    | 
    |   PB14 (AF)  |   TSC_G1_IO3    | 
    |   PB15 (AF)  |   TSC_G1_IO4    | 
    |--------------|-----------------|
    |   PB4 (AF)   |   TSC_G2_IO1    | 
    |   PB5 (AF)   |   TSC_G2_IO2    | 
    |   PB6 (AF)   |   TSC_G2_IO3    | 
    |   PB7 (AF)   |   TSC_G2_IO4    | 
    |--------------|-----------------|
    |   PA15 (AF)  |   TSC_G3_IO1    | 
    |   PC10 (AF)  |   TSC_G3_IO2    | 
    |   PC11 (AF)  |   TSC_G3_IO3    | 
    |   PC12 (AF)  |   TSC_G3_IO4    | 
    |--------------|-----------------|
    |   PC6 (AF)   |   TSC_G4_IO1    | 
    |   PC7 (AF)   |   TSC_G4_IO2    | 
    |   PC8 (AF)   |   TSC_G4_IO3    | 
    |   PC9 (AF)   |   TSC_G4_IO4    | 
    |--------------|-----------------|
    |   PE10 (AF)  |   TSC_G5_IO1    | 
    |   PE11 (AF)  |   TSC_G5_IO2    | 
    |   PE12 (AF)  |   TSC_G5_IO3    | 
    |   PE13 (AF)  |   TSC_G5_IO4    | 
    |--------------|-----------------|
    |   PD10 (AF)  |   TSC_G6_IO1    | 
    |   PD11 (AF)  |   TSC_G6_IO2    | 
    |   PD12 (AF)  |   TSC_G6_IO3    | 
    |   PD13 (AF)  |   TSC_G6_IO4    | 
    |--------------|-----------------|
    |   PE2 (AF)   |   TSC_G7_IO1    | 
    |   PE3 (AF)   |   TSC_G7_IO2    | 
    |   PE4 (AF)   |   TSC_G7_IO3    | 
    |   PE5 (AF)   |   TSC_G7_IO4    | 
    |--------------|-----------------|
    |   PF14 (AF)  |   TSC_G8_IO1    | 
    |   PF15 (AF)  |   TSC_G8_IO2    | 
    |   PG0 (AF)   |   TSC_G8_IO3    | 
    |   PG1 (AF)   |   TSC_G8_IO4    | 
    |--------------|-----------------|
    |   PB10 (AF)  |   TSC_SYNC      | 
    |   PD2 (AF)   |                 | 
    +--------------------------------+

  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32l4xx_hal.h"

/** @addtogroup STM32L4xx_HAL_Driver
  * @{
  */

/** @defgroup 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 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_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));

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

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

  /* Init the low level hardware : GPIO, CLOCK, CORTEX */
  HAL_TSC_MspInit(htsc);

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

  /* Enable TSC */
  htsc->Instance->CR = TSC_CR_TSCE;
  
  /* Set all functions */
  htsc->Instance->CR |= (htsc->Init.CTPulseHighLength |
                         htsc->Init.CTPulseLowLength |
                         (uint32_t)(htsc->Init.SpreadSpectrumDeviation << 17) |
                         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 = (uint32_t)(~(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 &= (uint32_t)(~(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;
 
  /* DeInit the low level hardware */
  HAL_TSC_MspDeInit(htsc);
  
  /* 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.
   */ 
}

/**
  * @}
  */

/** @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));
 
  /* Process locked */
  __HAL_LOCK(htsc);

  /* Stop acquisition */
  __HAL_TSC_STOP_ACQ(htsc);

  /* Disable Schmitt trigger hysteresis on all used TSC IOs */
  htsc->Instance->IOHCR = (uint32_t)(~(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: enable or disable
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TSC_IODischarge(TSC_HandleTypeDef* htsc, uint32_t 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;
    /* Conversion completed callback */
    HAL_TSC_ErrorCallback(htsc);
  }
  else
  {
    /* Change TSC state */
    htsc->State = HAL_TSC_STATE_READY;
    /* Conversion completed callback */
    HAL_TSC_ConvCpltCallback(htsc);
  }
}

/**
  * @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 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 = 0;
  uint32_t idx;
  
  for (idx = 0; idx < TSC_NB_OF_GROUPS; idx++)
  {
    if ((iomask & ((uint32_t)0x0F << (idx * 4))) != RESET)
    {
      groups |= ((uint32_t)1 << idx);
    }
  }
  
  return groups;
}

/**
  * @}
  */

#endif /* HAL_TSC_MODULE_ENABLED */

/**
  * @}
  */ 

/**
  * @}
  */ 

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/