d4dtchhw_s12_adc.c

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/**************************************************************************
*
* Copyright 2014 by Petr Gargulak. eGUI Community.
* Copyright 2009-2013 by Petr Gargulak. Freescale Semiconductor, Inc.
*
***************************************************************************
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License Version 3
* or later (the "LGPL").
*
* As a special exception, the copyright holders of the eGUI project give you
* permission to link the eGUI sources with independent modules to produce an
* executable, regardless of the license terms of these independent modules,
* and to copy and distribute the resulting executable under terms of your
* choice, provided that you also meet, for each linked independent module,
* the terms and conditions of the license of that module.
* An independent module is a module which is not derived from or based
* on this library.
* If you modify the eGUI sources, you may extend this exception
* to your version of the eGUI sources, but you are not obligated
* to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License
* and the GNU Lesser General Public License along with this program.
* If not, see <http://www.gnu.org/licenses/>.
*
***************************************************************************/
#include "d4d.h"
#include "common_files/d4d_lldapi.h"
#include "common_files/d4d_private.h"


// define the identification string of this low level driver
#define d4dtchhw_s12_adc_ID 1

#if (D4D_MK_STR(D4D_LLD_TCH_HW) == d4dtchhw_s12_adc_ID)

  #include "low_level_drivers/touch_screen/touch_screen_hw_interface/s12_adc_12b/d4dtchhw_s12_adc.h"
  /******************************************************************************
  * Macros
  ******************************************************************************/
  /**************************************************************/
  static unsigned char D4DTCHHW_Init_s12_adc(void);
  static unsigned char D4DTCHHW_DeInit_s12_adc(void);
  static unsigned short D4DTCHHW_ReadTouchAxis_s12_adc(D4DTCHHW_PINS pinId);
  static D4D_TOUCHSCREEN_LIMITS* D4DTCHHW_GetRawLimits_s12_adc(void);
  static unsigned char D4DTCHHW_PinCtl_s12_adc(D4DTCHHW_PINS pinId, D4DHW_PIN_STATE setState);

  /**************************************************************/
  const D4DTCHHW_FUNCTIONS d4dtchhw_s12_adc =
  {
    D4DTCHHW_Init_s12_adc,
    D4DTCHHW_ReadTouchAxis_s12_adc,
    D4DTCHHW_GetRawLimits_s12_adc,
    D4DTCHHW_PinCtl_s12_adc,
    D4DTCHHW_DeInit_s12_adc
  };

  const D4D_TOUCHSCREEN_LIMITS d4dtchhw_s12_adc_12b_limits =
  {
    D4DTCH_FULL_SCALE,
    D4DTCH_X_TOUCH_MIN,
    D4DTCH_Y_TOUCH_MIN,
    D4DTCH_X_TOUCH_OFFMAX,
    D4DTCH_Y_TOUCH_OFFMAX
  };

  /**************************************************************/
  static unsigned char D4DTCHHW_Init_s12_adc(void)
  {
    D4DTCH_INIT_X_PLUS;
    D4DTCH_INIT_X_MINUS;
    D4DTCH_INIT_Y_PLUS;
    D4DTCH_INIT_Y_MINUS;

    return 1;
  }

    //-----------------------------------------------------------------------------
  // FUNCTION:    D4DTCHHW_DeInit_s12_adc
  // SCOPE:       Low Level Driver API function
  // DESCRIPTION: The function is used for deinitialization of this hw low level driver
  //
  // PARAMETERS:  none
  //
  // RETURNS:     result: 1 - Success
  //                      0 - Failed
  //-----------------------------------------------------------------------------
  static unsigned char D4DTCHHW_DeInit_s12_adc(void)
  {
    return 0;
  }

  /**************************************************************/
  static unsigned short D4DTCHHW_ReadTouchAxis_s12_adc(D4DTCHHW_PINS pinId)
  {
     short cnt = 1;
      unsigned short advalue=0;
      //unsigned short adres0,adres1,adres2,adres3;// Adresults

      // clock divide = max. 8.3MHz @50MHz BUS
      if(D4DTCH_ATDSTAT0_SCF) // b01800
        return 0;

      D4DTCH_ATDCTL1 = 0x40;// 12bit
      //D4DTCH_ATDCTL2 = 0x40;// Fast flag clear (AFFC=1)
      D4DTCH_ATDCTL3 = 0xA3;// 4conv.(S4C=1),right justified (DJM=1), Freeze in debug
      D4DTCH_ATDCTL4 = 0x02;// Fatd = Fbus/6

      if(pinId == D4DTCH_X_PLUS_PIN)
        D4DTCH_ATDCTL5 = D4DTCH_X_PLUS_ADCH;

      else if(pinId == D4DTCH_Y_PLUS_PIN)
        D4DTCH_ATDCTL5 = D4DTCH_Y_PLUS_ADCH;
      else
        return 0;

      //D4DTCH_ATDCTL5 = AdcChannel & 0x0F;// Set channel and run single sequence

      // Wait for ADC conversion to complete
      while ((!D4DTCH_ATDSTAT0_SCF) && (++cnt)) // loop w timeout
      {
          ;
      }

      // if the measurement ends by timeout return 0 in other case result of ADC conversion
      if(cnt)
        {  //Average of four results
           advalue = (unsigned short)((D4DTCH_ATDDR0+D4DTCH_ATDDR1+D4DTCH_ATDDR2+D4DTCH_ATDDR3)/4);
           D4DTCH_ATDSTAT0 = 0x80; // clear Flag manually
           return(advalue);
        }
      else
        return 0;
  }

  static D4D_TOUCHSCREEN_LIMITS* D4DTCHHW_GetRawLimits_s12_adc(void)
  {
    return (D4D_TOUCHSCREEN_LIMITS*)&d4dtchhw_s12_adc_12b_limits;
  }

  static unsigned char D4DTCHHW_PinCtl_s12_adc(D4DTCHHW_PINS pinId, D4DHW_PIN_STATE setState)
  {
    switch(pinId)
    {
      case D4DTCH_X_PLUS_PIN:
        switch(setState)
        {
          case D4DHW_PIN_OUT:
            OUTPUT(D4DTCH_X_PLUS);
            break;
          case D4DHW_PIN_IN:
            INPUT(D4DTCH_X_PLUS);
            break;
          case D4DHW_PIN_SET_1:
            D4DTCH_SET_X_PLUS
            break;
          case D4DHW_PIN_SET_0:
            D4DTCH_RESET_X_PLUS;
            break;
          case D4DHW_PIN_ADC_ON:
            D4DTCH_X_PLUS_ADCH_PIN_ENABLE;
            break;
          case D4DHW_PIN_ADC_OFF:
            D4DTCH_X_PLUS_ADCH_PIN_DISABLE;
            break;
        }
        break;
      case D4DTCH_X_MINUS_PIN:
        switch(setState)
        {
          case D4DHW_PIN_OUT:
            OUTPUT(D4DTCH_X_MINUS);
            break;
          case D4DHW_PIN_IN:
            INPUT(D4DTCH_X_MINUS);
            break;
          case D4DHW_PIN_SET_1:
            D4DTCH_SET_X_MINUS
            break;
          case D4DHW_PIN_SET_0:
            D4DTCH_RESET_X_MINUS;
            break;
        }
        break;
      case D4DTCH_Y_PLUS_PIN:
        switch(setState)
        {
          case D4DHW_PIN_OUT:
            OUTPUT(D4DTCH_Y_PLUS);
            break;
          case D4DHW_PIN_IN:
            INPUT(D4DTCH_Y_PLUS);
            break;
          case D4DHW_PIN_SET_1:
            D4DTCH_SET_Y_PLUS
            break;
          case D4DHW_PIN_SET_0:
            D4DTCH_RESET_Y_PLUS;
            break;
          case D4DHW_PIN_ADC_ON:
            D4DTCH_Y_PLUS_ADCH_PIN_ENABLE;
            break;
          case D4DHW_PIN_ADC_OFF:
            D4DTCH_Y_PLUS_ADCH_PIN_DISABLE;
            break;
        }
        break;
      case D4DTCH_Y_MINUS_PIN:
        switch(setState)
        {
          case D4DHW_PIN_OUT:
            OUTPUT(D4DTCH_Y_MINUS);
            break;
          case D4DHW_PIN_IN:
            INPUT(D4DTCH_Y_MINUS);
            break;
          case D4DHW_PIN_SET_1:
            D4DTCH_SET_Y_MINUS
            break;
          case D4DHW_PIN_SET_0:
            D4DTCH_RESET_Y_MINUS;
            break;
        }
        break;

    }
    return 0;
  }

#endif