path: root/third_party/TouchSense/STMTouch_Driver/src/tsl_acq_stm8l_hw.c

/**
  ******************************************************************************
  * @file    tsl_acq_stm8l_hw.c
  * @author  MCD Application Team
  * @version V1.4.4
  * @date    31-March-2014
  * @brief   This file contains all functions to manage the acquisition
  *          on STM8L products using the hardware acquisition mode (with Timers).
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "tsl_acq_stm8l_hw.h"
#include "tsl_globals.h"

/* Private typedefs ----------------------------------------------------------*/

/** Structure containing RI IO informations according to GPIO.
  */
typedef struct
{
  unsigned int IO_Channel : 4; /**< Channel number from 1 to 4 in the Routing interface group */
  unsigned int IO_Group   : 4; /**< Group number in the Routing interface */
} TSL_IOConf_T;

/* Private defines -----------------------------------------------------------*/

#define MAX_CHANNEL_NUMBER_BY_GROUP (4)

/* Private macros ------------------------------------------------------------*/

#define GPIO_PORT(GPIO)  (GPIO >> 3)   /**< Get the GPIO port*/
#define GPIO_BIT(GPIO)   (GPIO & 0x07) /**< Get the GPIO pin number*/

#define IS_BANK_INDEX_OK(INDEX)   (((INDEX) == 0) || (((INDEX) > 0) && ((INDEX) < TSLPRM_TOTAL_BANKS))) /**< Check if the index have a good range*/

#define GPIO_ODR_HIGH(GPIO)      (p_GPIOx[GPIO_PORT(GPIO)]->ODR |= (uint8_t)(1 << GPIO_BIT(GPIO)))
#define GPIO_ODR_LOW(GPIO)       (p_GPIOx[GPIO_PORT(GPIO)]->ODR &= (uint8_t)(~(1 << GPIO_BIT(GPIO))))
#define GPIO_DDR_IN(GPIO)        (p_GPIOx[GPIO_PORT(GPIO)]->DDR &= (uint8_t)(~(1 << GPIO_BIT(GPIO))))
#define GPIO_DDR_OUT(GPIO)       (p_GPIOx[GPIO_PORT(GPIO)]->DDR |= (uint8_t)(1 << GPIO_BIT(GPIO)))
#define GPIO_CR1_PP(GPIO)        (p_GPIOx[GPIO_PORT(GPIO)]->CR1 |= (uint8_t)(1 << GPIO_BIT(GPIO)))
#define GPIO_CR1_FLOATING(GPIO)  (p_GPIOx[GPIO_PORT(GPIO)]->CR1 &= (uint8_t)(~(1 << GPIO_BIT(GPIO))))

#define DISABLE_MASK(GPIO)     (DisableMask[(GPIO_to_SW_Conf[GPIO].IO_Channel)-1] |= (uint8_t)(1 << GPIO_to_SW_Conf[GPIO].IO_Group)) /**< Create disable mask array to modify initial bank mask before acquisition (only for STATUS_OFF)*/
#define DISABLE_SAMPLING(GPIO) (DisableSampling |= (uint8_t)(1 << GPIO_to_SW_Conf[GPIO].IO_Group)) /**< Create disable sampling mask to don't take sampling measurement of corresponding channels(for STATUS_BURST_ONLY and shield) */

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

__IO uint8_t *p_IOIRx;            // Pointer to the IOIRx register (x from 1 to 4)
__IO uint8_t *p_IOMRx;            // Pointer to the IOMRx register (x from 1 to 4)
uint8_t OldStatus;                // Mask used to memorize the IOIRx bits processed during the acquisition
uint8_t BankDone;                // Control if all activate sampling reach the VIH level
uint8_t CurrentSampling;         // Mask to control IOGCR register
uint8_t CurrentChannel;          // Mask to control IOGCR register
uint8_t ChannelSampling;         // Contain the channel number where all sampling are connected
uint8_t DisableSampling;         // Disable sampling mask when the Burst Only mode is activated for one channel of the current bank(not get the measure)

TSL_Bank_Config_Mask_T BankMask[TSLPRM_TOTAL_BANKS]; // Complete masks (channel and sampling) to configure IOCMRx and IOSRx registers for all banks
uint8_t SamplingMask[TSLPRM_TOTAL_BANKS];            // Sampling mask to configure IOGCR register for all banks
uint8_t ChannelMask[TSLPRM_TOTAL_BANKS];             // Channel mask to configure IOGCR register for all banks
uint8_t DisableMask[MAX_CHANNEL_NUMBER_BY_GROUP];    // Complete disable mask(channel and sampling) when the Channel OFF mode is activated for one channel of the current bank(to modifie the Current_Bank)
uint8_t CurrentBank[MAX_CHANNEL_NUMBER_BY_GROUP];    // Complete mask for the current bank
uint16_t tab_MeasurementCounter[8] = {0};             // Measurement of each sampling of the current bank

TSL_Status_enum_T TSL_Acq_Status = TSL_STATUS_BUSY;

GPIO_TypeDef *p_GPIOx[] = {GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, GPIOF};

__IO uint8_t *RI_IOIRx_Register[MAX_CHANNEL_NUMBER_BY_GROUP] = {&(RI->IOIR1), &(RI->IOIR2), &(RI->IOIR3), &(RI->IOIR4)};
__IO uint8_t *RI_IOMRx_Register[MAX_CHANNEL_NUMBER_BY_GROUP] = {&(RI->IOMR1), &(RI->IOMR2), &(RI->IOMR3), &(RI->IOMR4)};


/* Table which do the link between GPIO and switch configuation:{x,y}
   x = channel number
   y = group number - 1
   Note: {0,0} = not connect to IO switch
*/
CONST TSL_IOConf_T GPIO_to_SW_Conf[40] =
{
  // Port A definitions
  {0, 0}, // PA0
  {0, 0}, // PA1
  {0, 0}, // PA2
  {0, 0}, // PA3
  {3, 0}, // PA4 is channel 3 of Group 1
  {2, 0}, // PA5 is channel 2 of Group 1
  {1, 0}, // PA6 is channel 1 of Group 1
  {4, 0}, // PA7 is channel 4 of Group 1
  // Port B definitions
  {1, 6}, // PB0
  {3, 5},
  {2, 5},
  {1, 5},
  {3, 4},
  {2, 4},
  {1, 4},
  {3, 3}, // PB7
  // Port C definitions
  {0, 0}, // PC0
  {0, 0},
  {1, 2},
  {3, 1},
  {2, 1},
  {0, 0},
  {0, 0},
  {1, 1}, // PC7
  // Port D definitions
  {2, 7}, // PD0
  {1, 7},
  {3, 6},
  {2, 6},
  {2, 3},
  {1, 3},
  {3, 2},
  {2, 2}, // PD7
  // Port E definitions
  {0, 0}, // PE0
  {0, 0},
  {0, 0},
  {4, 6},
  {4, 7},
  {3, 7},
  {0, 0},
  {4, 1} // PE7
};

/* Private functions prototype -----------------------------------------------*/
void SoftDelay(uint16_t val);
void CreateMask(uint16_t idx_bk, uint8_t GPIO);
void TSL_Init_GPIOs(void);
void TSL_Init_TIMs(void);
TSL_Status_enum_T TSL_Init_RI(void);


/**
  * @brief  Initializes the touch sensing GPIOs.
  * @param  None
  * @retval None
  */
void TSL_Init_GPIOs(void)
{
  CONST TSL_Bank_T *p_bank = &(TSL_Globals.Bank_Array[0]); // Pointer to the first bank
  CONST TSL_ChannelSrc_T *p_chSrc = p_bank->p_chSrc; // Pointer to the source channel of the current bank  
  uint16_t number_of_channels = 0;
  uint16_t idx_bk;
  uint16_t idx_ch;
  
  // Initializes each bank and configures the used GPIO
  for (idx_bk = 0; idx_bk < TSLPRM_TOTAL_BANKS; idx_bk++)
  {

    p_bank = &(TSL_Globals.Bank_Array[idx_bk]);
    p_chSrc = p_bank->p_chSrc;

    number_of_channels = p_bank->NbChannels;

#if (TSLPRM_USE_SHIELD > 0)
    // GPIO in Output
    GPIO_DDR_OUT(p_bank->shield_sampling);
    GPIO_DDR_OUT(p_bank->shield_channel);
    // GPIO in PP
    GPIO_CR1_PP(p_bank->shield_sampling);
    GPIO_CR1_PP(p_bank->shield_channel);
    // Output in Low level
    GPIO_ODR_LOW(p_bank->shield_sampling);
    GPIO_ODR_LOW(p_bank->shield_channel);
#endif

    // Initialize the mask for channel and sampling
    for (idx_ch = 0; idx_ch < number_of_channels; idx_ch++)
    {
      // GPIO are configured in PP Low mode when inactive
      // GPIO in Output
      GPIO_DDR_OUT(p_chSrc->sampling);
      GPIO_DDR_OUT(p_chSrc->channel);
      // GPIO in PP
      GPIO_CR1_PP(p_chSrc->sampling);
      GPIO_CR1_PP(p_chSrc->channel);
      // Output in Low level
      GPIO_ODR_LOW(p_chSrc->sampling);
      GPIO_ODR_LOW(p_chSrc->channel);
      // Next channel
      p_chSrc++;
    }
  }
}


/**
  * @brief  Initializes the timers used for touch sensing hardware acquisition.
  * @param  None
  * @retval None
  */
void TSL_Init_TIMs(void)
{
  CLK->PCKENR1 |= 0x03; // Enable TIM2 and TIM3 clocks
  
  //==============================
  // TIMER 2 configuration: Master
  //==============================
  // Channel 1 as output, set PWM mode 1
  TIM2->CCMR1 = 0x60;
  TIM2->CCMR2 = 0x60;
  // Main Output Enable
  TIM2->BKR |= 0x80; // MOE=1
  // Center-Aligned mode 3
  TIM2->CR1 |= 0x60; // CMS=11
  // OC2 polarity = active low
  TIM2->CCER1 |= 0x20; // CC2P=1
  // Enable OC2
  TIM2->CCER1 |= 0x10; // CC2E=1
  // Set the Prescaler value
  TIM2->PSCR = 0; // fCK_CNT = 16MHz/(0+1) = 16MHz --> T=62.5ns
  // Set the Autoreload value (signal frequency)
  TIM2->ARRH = (uint8_t)(TIM_RELOAD >> 8);
  TIM2->ARRL = (uint8_t)(TIM_RELOAD);
  // Set PWM1 duty cycle
  TIM2->CCR1H = (uint8_t)(TIM2_PWM_CH1_WIDTH >> 8);
  TIM2->CCR1L = (uint8_t)(TIM2_PWM_CH1_WIDTH);
  // Set PWM2 duty cycle
  TIM2->CCR2H = (uint8_t)(TIM2_PWM_CH2_WIDTH >> 8);
  TIM2->CCR2L = (uint8_t)(TIM2_PWM_CH2_WIDTH);
  // Select Master mode, Internal Trigger selection, Gated mode
  TIM2->SMCR = 0x35; // TS=011=ITR3(TIM2), SMS=101=Gated mode enabled
  // Map OC1REF to TRGO
  TIM2->CR2 = 0x40; // MMS=100
  // Enable OC1
  TIM2->CCER1 |= 0x01; // CC1E=1
  // Set Update generation
  TIM2->EGR |= 0x01; // UG=1
  // Set Break interrupt flag
  TIM2->SR1 |= 0x80;
  
  //==============================
  // TIMER 3 configuration: slave
  //==============================
  // Enable External Clock mode 2, external trigger filter, trigger on high level or rising edge
  TIM3->ETR = 0x42; // ETP=0, ECE=1, ETF=0010
  // Capture/Compare 1 configured as Input: h/w detection mapped on TI2FP1
  TIM3->CCMR1 = 0x02; // CC1S=10
  // Capture/Compare 2 configured as Output: MaxCount
  TIM3->CCMR2 = 0; // CC2S=00
  // Enable CC1 channel as Input for Capture function
  TIM3->CCER1 = 0x01; // CC1E=1
  // Enable counter (slave must be enabled first)
  TIM3->CR1 |= 0x01; // CEN=1
}


/**
  * @brief  Init routing interface.
  * @param  None
  * @retval None
  */
TSL_Status_enum_T TSL_Init_RI(void)
{
  CONST TSL_Bank_T *p_bank = &(TSL_Globals.Bank_Array[0]); // Pointer to the first bank
  CONST TSL_ChannelSrc_T *p_chSrc = p_bank->p_chSrc; // Pointer to the source channel of the current bank  
  uint16_t number_of_channels = 0;
  uint16_t idx_bk;
  uint16_t idx_ch;

  // Enable comparator clock to activate the RI block
  CLK->PCKENR2 |= CLK_PCKENR2_COMP;

  // Enable H/W acquisition sequence
  RI->CR |= 0x04; // AM=1
  
  // Enable Channel Acquisition interrupt
  RI->CR |= 0x01; // TIE=1

  // Suspend Timer2 on h/w detection
  RI->CR |= 0x08; // THALT=1
  
  // Enable schmitt trigger required for H/W acq mode.
  COMP->CSR1 |= 0x04; // STE=1
  
  // Initializes each bank and configures the used GPIO
  for (idx_bk = 0; idx_bk < TSLPRM_TOTAL_BANKS; idx_bk++)
  {
    
    p_bank = &(TSL_Globals.Bank_Array[idx_bk]);
    p_chSrc = p_bank->p_chSrc;
    
    number_of_channels = p_bank->NbChannels;
    
    // Masks initialisation
    BankMask[idx_bk].ch1 = 0;
    BankMask[idx_bk].ch2 = 0;
    BankMask[idx_bk].ch3 = 0;
    BankMask[idx_bk].ch4 = 0;
    
    // Get which channel is used for sampling only one time because it's the same for each couple
    SamplingMask[idx_bk] = (uint8_t)GPIO_to_SW_Conf[p_chSrc->sampling].IO_Channel;

#if (TSLPRM_USE_SHIELD > 0)
    // Create Mask per bank
    CreateMask(idx_bk,p_bank->shield_sampling);
    CreateMask(idx_bk,p_bank->shield_channel);
    ChannelMask[idx_bk] |= (uint8_t)(3 << (2 * ((GPIO_to_SW_Conf[p_bank->shield_channel].IO_Channel) - 1)));
    if ((SamplingMask[idx_bk] != (uint8_t)GPIO_to_SW_Conf[p_bank->shield_sampling].IO_Channel))
    {
      return TSL_STATUS_ERROR;
    }
#endif

    // Initializes the mask for channel and sampling
    for (idx_ch = 0; idx_ch < number_of_channels; idx_ch++)
    {
      // Create Mask per bank
      CreateMask(idx_bk,p_chSrc->channel);
      CreateMask(idx_bk,p_chSrc->sampling);
      ChannelMask[idx_bk] |= (uint8_t)(3 << (2 * ((GPIO_to_SW_Conf[p_chSrc->channel].IO_Channel) - 1)));
      if ((SamplingMask[idx_bk] != (uint8_t)GPIO_to_SW_Conf[p_chSrc->sampling].IO_Channel))
      {
        return TSL_STATUS_ERROR;
      }
      // Next channel
      p_chSrc++;
    }
      
    // Unlock IO to RI register : IO controlled by GPIO
    RI->IOCMR1 &= (uint8_t)(~BankMask[idx_bk].ch1);
    RI->IOCMR2 &= (uint8_t)(~BankMask[idx_bk].ch2);
    RI->IOCMR3 &= (uint8_t)(~BankMask[idx_bk].ch3);
    RI->IOCMR4 &= (uint8_t)(~BankMask[idx_bk].ch4);
  }
  return  TSL_STATUS_OK;
}


/**
  * @brief  Create Mask for all banks
  * @param[in] idx_bk  Index of the Bank to configure
  * @param[in] GPIO     Pin number
  * @retval None
  */
void CreateMask(uint16_t idx_bk, uint8_t GPIO)
{
  switch(GPIO_to_SW_Conf[GPIO].IO_Channel)
  {
    case 1:
      BankMask[idx_bk].ch1 |= (uint8_t)(1 << GPIO_to_SW_Conf[GPIO].IO_Group); // Mask for all first channel
      break;
    case 2:
      BankMask[idx_bk].ch2 |= (uint8_t)(1 << GPIO_to_SW_Conf[GPIO].IO_Group); // Mask for all second channel
      break;
    case 3:
      BankMask[idx_bk].ch3 |= (uint8_t)(1 << GPIO_to_SW_Conf[GPIO].IO_Group); // Mask fo all third channel
      break;
    case 4:
      BankMask[idx_bk].ch4 |= (uint8_t)(1 << GPIO_to_SW_Conf[GPIO].IO_Group); // Mask for all fourth channel
      break;
    default:
      break;
  }
}


/**
  * @brief  Initializes the acquisition module.
  * @param  None
  * @retval retval
  */
TSL_Status_enum_T TSL_acq_Init(void)
{
  TSL_Init_GPIOs();
  TSL_Init_TIMs();
  TSL_Init_RI();
  return TSL_STATUS_OK;
}


/**
  * @brief Configures a Bank.
  * @param[in] idx_bk  Index of the Bank to configure
  * @retval Status
  */
TSL_Status_enum_T TSL_acq_BankConfig(TSL_tIndex_T idx_bk)
{
  uint8_t idx;
  uint16_t idx_dest;
  uint16_t idx_ch;
  uint16_t number_of_channels = 0;
  CONST TSL_Bank_T *p_bank; // Pointer to the current bank
  CONST TSL_ChannelDest_T *p_chDest; // Pointer to the first destination channel of the current bank
  CONST TSL_ChannelSrc_T *p_chSrc; // Pointer to the fisrt source channel of the current bank
  
  // Check parameters (if USE_FULL_ASSERT is defined)
  assert_param(IS_BANK_INDEX_OK(idx_bk));
  
  OldStatus = 0;
  
  TSL_Globals.This_Bank = idx_bk;
  p_bank = &(TSL_Globals.Bank_Array[idx_bk]);
  number_of_channels = p_bank->NbChannels;
  p_chDest = p_bank->p_chDest;
  p_chSrc = p_bank->p_chSrc;
    
  // Reset the disable mask
  DisableSampling = 0;
  for (idx = 0; idx < MAX_CHANNEL_NUMBER_BY_GROUP; idx++)
  {
    DisableMask[idx] = 0;
  }

#if (TSLPRM_USE_SHIELD > 0)
  DISABLE_SAMPLING(p_bank->shield_sampling);
#endif

  // Loop for each channel of this bank
  for (idx_ch = 0; idx_ch < number_of_channels; idx_ch++)
  {
    
    idx_dest = p_chDest->IdxDest;

    // Mode Status OFF
    if (p_bank->p_chData[idx_dest].Flags.ObjStatus == TSL_OBJ_STATUS_OFF)
    {
      // Update Mask if channels are disabled
      DISABLE_MASK(p_chSrc->channel);
      DISABLE_MASK(p_chSrc->sampling);
    }

    // Mode Status BURST ONLY
    if (p_bank->p_chData[idx_dest].Flags.ObjStatus == TSL_OBJ_STATUS_BURST_ONLY)
    {
      DISABLE_SAMPLING(p_chSrc->sampling);
    }

    tab_MeasurementCounter[GPIO_to_SW_Conf[p_chSrc->sampling].IO_Group] = 0;

    // Next channel    
    p_chSrc++;
    p_chDest++;
  }

  // Get Mask for the current bank
  CurrentBank[0] = (uint8_t)(BankMask[idx_bk].ch1 & (~DisableMask[0])); // Mask for all 1st channel are used by channels and sampling for this bank
  CurrentBank[1] = (uint8_t)(BankMask[idx_bk].ch2 & (~DisableMask[1])); // Mask for all 2nd channel are used by channels and sampling for this bank
  CurrentBank[2] = (uint8_t)(BankMask[idx_bk].ch3 & (~DisableMask[2])); // Mask for all 3rd channel are used by channels and sampling for this bank
  CurrentBank[3] = (uint8_t)(BankMask[idx_bk].ch4 & (~DisableMask[3])); // Mask for all 4th channel are used by channels and sampling for this bank

  CurrentChannel = ChannelMask[idx_bk]; // Mask for channels 
  CurrentSampling = (uint8_t)(3 << (2 * (SamplingMask[idx_bk] - 1))); // Mask for sampling
  ChannelSampling = SamplingMask[idx_bk]; // Mask for the channel used by sampling
 
  // Channel's state of the current bank
  BankDone = (uint8_t)(CurrentBank[ChannelSampling - 1] & (~DisableSampling));

  // Select the IO Input register corresponding to the channel sampling (to optimize the measurement)  
  p_IOIRx = RI_IOIRx_Register[ChannelSampling - 1];

  // Select the IO Mask register corresponding to the channel sampling (to optimize the measurement)
  p_IOMRx = RI_IOMRx_Register[ChannelSampling - 1];
  
  return TSL_STATUS_OK;
}


/**
  * @brief Start acquisition on a previously configured bank
  * @param None
  * @retval None
  */
void TSL_acq_BankStartAcq(void)
{
#if (TSLPRM_IODEF > 0)

  CONST TSL_Bank_T *p_bank = &(TSL_Globals.Bank_Array[0]);
  CONST TSL_ChannelSrc_T *p_chSrc;
  TSL_tNb_T number_of_channels = 0;
  TSL_tIndex_T idx_bk;
  TSL_tIndex_T idx_ch;

  //============================
  // All GPIOs in Input floating
  //============================
  for (idx_bk = 0; idx_bk < TSLPRM_TOTAL_BANKS; idx_bk++)
  {
    p_bank = &(TSL_Globals.Bank_Array[idx_bk]);
    p_chSrc = p_bank->p_chSrc;

#if (TSLPRM_USE_SHIELD > 0)
    // GPIO in Input
    GPIO_DDR_IN(p_bank->shield_sampling);
    GPIO_DDR_IN(p_bank->shield_channel);
    // GPIO in floating mode
    GPIO_CR1_FLOATING(p_bank->shield_sampling);
    GPIO_CR1_FLOATING(p_bank->shield_channel);
#endif // TSLPRM_USE_SHIELD

    number_of_channels = p_bank->NbChannels;

    for (idx_ch = 0;
         idx_ch < number_of_channels;
         idx_ch++)
    {
      // GPIO in Input
      GPIO_DDR_IN(p_chSrc->sampling);
      GPIO_DDR_IN(p_chSrc->channel);
      // GPIO in floating mode
      GPIO_CR1_FLOATING(p_chSrc->sampling);
      GPIO_CR1_FLOATING(p_chSrc->channel);
      p_chSrc++;
    }
  }
#endif // TSLPRM_IODEF

  // Test if this bank is not empty
  if (BankDone != 0)
  { 
  
    // Set the AL bit to exit from WFI mode only on PXS interrupt
    CFG->GCR |= (uint8_t)CFG_GCR_AL;

    //--------------------------------------------
    // Configure Timer3 for the MaxCount detection
    //--------------------------------------------
 
    // Clear the Slave timer counter
    TIM3->CNTRH = 0;
    TIM3->CNTRL = 0;
   
    // Timer3 interruption routine to detect MaxCount
    // Warning: the high byte must be written before the low byte
    TIM3->CCR2H = (uint8_t)((TSL_Params.AcqMax+1) >> 8);
    TIM3->CCR2L = (uint8_t)(TSL_Params.AcqMax+1);
   
    // Clear all Timer3 flags...
    TIM3->SR1 = 0;
    TIM3->SR2 = 0;
   
    // Enable Capture/Compare 2 interrupt: MaxCount
    TIM3->IER |= 0x04; // CC2IE=1
   
    //--------------------------------------------

    // Enable necessary IOs
    RI->IOCMR1 |= (uint8_t)CurrentBank[0];
    RI->IOCMR2 |= (uint8_t)CurrentBank[1];
    RI->IOCMR3 |= (uint8_t)CurrentBank[2];
    RI->IOCMR4 |= (uint8_t)CurrentBank[3];
    
    // Discharge all capacitors
    RI->IOSR1 &= (uint8_t)(~CurrentBank[0]);
    RI->IOSR2 &= (uint8_t)(~CurrentBank[1]);
    RI->IOSR3 &= (uint8_t)(~CurrentBank[2]);
    RI->IOSR4 &= (uint8_t)(~CurrentBank[3]);
    
    // Wait a complete discharge
    SoftDelay(TSLPRM_DELAY_DISCHARGE_ALL);
    
    // Configure channel capacitors and sampling capacitors
    RI->IOGCR = (uint8_t)(0x55 & (~CurrentSampling));
    
    RI->IOSR1 |= (uint8_t)CurrentBank[0];
    RI->IOSR2 |= (uint8_t)CurrentBank[1];
    RI->IOSR3 |= (uint8_t)CurrentBank[2];
    RI->IOSR4 |= (uint8_t)CurrentBank[3];
    
    // Start acquisition
    TSL_Acq_Status = TSL_STATUS_BUSY;

    // Start the Master timer counter
    TIM2->CR1 |= 0x01; // CEN=1
  }
  else
  {
    TSL_Acq_Status = TSL_STATUS_OK;
  }
}


/**
  * @brief Wait end of acquisition
  * @param None
  * @retval status
  */
TSL_Status_enum_T TSL_acq_BankWaitEOC(void)
{
  return TSL_Acq_Status;
}


/**
  * @brief Return the current measure
  * @param[in] index Index of the measure source
  * @retval Measure
  */
TSL_tMeas_T TSL_acq_GetMeas(TSL_tIndex_T index)
{
  return(tab_MeasurementCounter[index]);
}


/**
  * @brief  Check noise (not used)
  * @param  None
  * @retval Status
  */
TSL_AcqStatus_enum_T TSL_acq_CheckNoise(void)
{
  return TSL_ACQ_STATUS_OK;
}


/**
  * @brief Used during HW acquisition mode.
  * @param  None
  * @retval None
  * @note Must be called by the TIM3 Capture/Compare interrupt routine.
  */
void TSL_CT_HWacq_TIM3(void)
{
  uint8_t new_status;
  uint8_t idx = 0;
  uint16_t timer_count;
  
  TIM2->CR1 &= (uint8_t)(~0x01); // Stop master counter 
  
  RI->IOMR1 = 0;
  RI->IOMR2 = 0;
  RI->IOMR3 = 0;
  RI->IOMR4 = 0;  
  
  // Discharge all capacitors (electrode and sampling capacitor IOs)
  RI->IOSR1 &= (uint8_t)(~(CurrentBank[0]));
  RI->IOSR2 &= (uint8_t)(~(CurrentBank[1]));
  RI->IOSR3 &= (uint8_t)(~(CurrentBank[2]));
  RI->IOSR4 &= (uint8_t)(~(CurrentBank[3]));
  
  TSL_Acq_Status = TSL_STATUS_OK;
  
  // Clear all Timer3 flags...
  TIM3->SR1 = 0;
  TIM3->SR2 = 0;
  
  // Read capture counter
  timer_count = (uint16_t)(TIM3->CCR1H << 8);
  timer_count += TIM3->CCR1L;
    
  new_status = (uint8_t)(BankDone & (~(OldStatus)));

  while ((new_status != 0) && (idx < 8))
  {
    if ((new_status & (1 << idx)) != 0)
    {
      tab_MeasurementCounter[idx] = timer_count;
      new_status &= (uint8_t)(~(1 << idx));
      OldStatus |= (uint8_t)(1 << idx);
      *p_IOMRx |= (uint8_t)(1 << idx); // Mask IO which reach VIH
    }
    idx++;
  }
}


/**
  * @brief Used during HW acquisition mode.
  * @param  None
  * @retval None
  * @note Must be called by the RI interrupt routine.
  *       Timer 2 and 3 are halted during this interrupt but counter is not reset.
  */
void TSL_CT_HWacq_RI(void)
{
  CONST TSL_Bank_T *p_bank = &(TSL_Globals.Bank_Array[0]);
  CONST TSL_ChannelSrc_T *p_chSrc;
  TSL_tNb_T number_of_channels = 0;
  TSL_tIndex_T idx_bk;
  TSL_tIndex_T idx_ch;
  
  __IO uint8_t IOIRx;
  uint8_t new_status;
  uint8_t idx = 0;
  uint16_t timer_count;
  
  IOIRx = *p_IOIRx;

  // Test RI Input register corresponding to sampling capacitors
  if ((IOIRx & BankDone) != OldStatus)
  {
    // Read capture counter
    timer_count = (uint16_t)(TIM3->CCR1H << 8);
    timer_count += TIM3->CCR1L;
    
    new_status = (uint8_t)((BankDone & IOIRx) & (~(OldStatus)));

    while ((new_status != 0) && (idx < 8))
    {
      if ((new_status & (1 << idx)) != 0)
      {
        tab_MeasurementCounter[idx] = timer_count;
        new_status &= (uint8_t)(~(1 << idx));
        OldStatus |= (uint8_t)(1 << idx);
        *p_IOMRx |= (uint8_t)(1 << idx); // Mask IO which reach VIH
      }
      idx++;
    }

    // When Current bank is completed
    if ((OldStatus == BankDone))
    {

      // Disable master counter
      TIM2->CR1 &= (uint8_t)(~0x01); // Stop master counter 
  
      // Reset IO Mask
      RI->IOMR1 = 0;
      RI->IOMR2 = 0;
      RI->IOMR3 = 0;
      RI->IOMR4 = 0;
  
      // Disable necessary IOs
      RI->IOSR1 &= (uint8_t)(~(CurrentBank[0]));
      RI->IOSR2 &= (uint8_t)(~(CurrentBank[1]));
      RI->IOSR3 &= (uint8_t)(~(CurrentBank[2]));
      RI->IOSR4 &= (uint8_t)(~(CurrentBank[3]));
  
      RI->IOCMR1 &= (uint8_t)(~(CurrentBank[0]));
      RI->IOCMR2 &= (uint8_t)(~(CurrentBank[1]));
      RI->IOCMR3 &= (uint8_t)(~(CurrentBank[2]));
      RI->IOCMR4 &= (uint8_t)(~(CurrentBank[3]));
    
  for (idx_bk = 0; idx_bk < TSLPRM_TOTAL_BANKS; idx_bk++)
  {
    p_bank = &(TSL_Globals.Bank_Array[idx_bk]);
    p_chSrc = p_bank->p_chSrc;

    number_of_channels = p_bank->NbChannels;

#if (TSLPRM_USE_SHIELD > 0)
    // GPIO in Output
    GPIO_DDR_OUT(p_bank->shield_sampling);
    GPIO_DDR_OUT(p_bank->shield_channel);
    // GPIO in PP
    GPIO_CR1_PP(p_bank->shield_sampling);
    GPIO_CR1_PP(p_bank->shield_channel);
    // Output in Low level
    GPIO_ODR_LOW(p_bank->shield_sampling);
    GPIO_ODR_LOW(p_bank->shield_channel);
#endif
    // Initialize the mask for channel and sampling
    for (idx_ch = 0; idx_ch < number_of_channels; idx_ch++)
    {
      // GPIO are configured in PP Low mode when inactive
      // GPIO in Output
      GPIO_DDR_OUT(p_chSrc->sampling);
      GPIO_DDR_OUT(p_chSrc->channel);
      // GPIO in PP
      GPIO_CR1_PP(p_chSrc->sampling);
      GPIO_CR1_PP(p_chSrc->channel);
      // Output in Low level
      GPIO_ODR_LOW(p_chSrc->sampling);
      GPIO_ODR_LOW(p_chSrc->channel);
      // Next channel
      p_chSrc++;
    }
  }
  
#if TSLPRM_USE_ZONE > 0

      TSL_acq_BankGetResult(TSL_Globals.This_Bank, 0, 0); // Get Bank Result
      
      if ((TSL_Globals.This_Zone == 0) || (TSL_Globals.Index_In_This_Zone >= TSL_Globals.This_Zone->NbBanks))
      {
        CFG->GCR &= (uint8_t)(~CFG_GCR_AL); // Reset Activation level to resume main processing
        TSL_Globals.This_Bank = 0;
      }
      else
      {
        if (TSL_acq_ZoneConfig(TSL_Globals.This_Zone, TSL_Globals.Index_In_This_Zone) != TSL_STATUS_ERROR)
        {
          // Start Bank acquisition
          TSL_acq_BankStartAcq();
        }
        else
        {
          CFG->GCR &= (uint8_t)(~CFG_GCR_AL); // Reset Activation level to resume main processing
          TSL_Globals.This_Bank = 0;
        }   
      }
#else
      CFG->GCR &= (uint8_t)(~CFG_GCR_AL);
#endif
    }
  }
  
  // Reset Interrupt flag
  RI->CR |= 0x02; // CAIF=1
  TSL_Acq_Status = TSL_STATUS_OK;
}


/**
  * @brief Check if a filter must be used on the current channel (not used)
  * @param[in] pCh Pointer on the channel data information
  * @retval Result TRUE if a filter can be applied
  */
TSL_Bool_enum_T TSL_acq_UseFilter(TSL_ChannelData_T *pCh)
{
  return TSL_TRUE;
}


/**
  * @brief Compute the Delta value
  * @param[in] ref Reference value
  * @param[in] meas Last Measurement value
  * @retval Delta value
  */
TSL_tDelta_T TSL_acq_ComputeDelta(TSL_tRef_T ref, TSL_tMeas_T meas)
{
  return((TSL_tDelta_T)(ref - meas));
}


/**
  * @brief Compute the Measurement value
  * @param[in] ref Reference value
  * @param[in] delta Delta value
  * @retval Measurement value
  */
TSL_tMeas_T TSL_acq_ComputeMeas(TSL_tRef_T ref, TSL_tDelta_T delta)
{
  return((TSL_tMeas_T)(ref - delta));
}


/**
  * @brief Test if the Reference is incorrect (not used)
  * @param[in] pCh Pointer on the channel data information
  * @retval Result TRUE if the Reference is out of range
  */
TSL_Bool_enum_T TSL_acq_TestReferenceOutOfRange(TSL_ChannelData_T *pCh)
{
  return TSL_FALSE;
}


/**
  * @brief Test if the measure has crossed the reference target (not used)
  * @param[in] pCh Pointer on the channel data information
  * @param[in] new_meas Measure of the last acquisition on this channel
  * @retval Result TRUE if the Reference is valid
  */
TSL_Bool_enum_T TSL_acq_TestFirstReferenceIsValid(TSL_ChannelData_T *pCh, TSL_tMeas_T new_meas)
{
  return TSL_TRUE;
}


#if defined(__ICCSTM8__)
#pragma optimize=low
#endif
/**
  * @brief  Software delay (private routine)
  * @param  val Wait delay
  * @retval None
  */
void SoftDelay(uint16_t val)
{
  uint16_t idx;
  for (idx = val; idx > 0; idx--)
  {
    nop();
  }
}

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