/*
*********************************************************************************************************
*                                                uC/GUI
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : GUITOUCH.C
Purpose     : Touch screen manager
----------------------------------------------------------------------
This module handles the touch screen. It is configured in the file
GUITouch.conf.h (Should be located in the Config\ directory).
----------------------------------------------------------------------
*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "LCD_Private.h"      /* private modul definitions & config */
#include "GUI_Protected.h"

/* Generate code only if configuration says so ! */
#if GUI_SUPPORT_TOUCH

#include "GUITouchconf.h"    /* Located in GUIx, will include GUITouch.conf.h */

/*
**********************************************************************
*
*          Config defaults
*
**********************************************************************
*/
#ifndef GUI_TOUCH_AD_LEFT      /* max value returned by AD-converter */
  #define GUI_TOUCH_AD_LEFT 30   
#endif

#ifndef GUI_TOUCH_AD_RIGHT      /* min value returned by AD-converter */
  #define GUI_TOUCH_AD_RIGHT 220    
#endif

#ifndef GUI_TOUCH_AD_TOP       /* max value returned by AD-converter */
  #define GUI_TOUCH_AD_TOP 30
#endif

#ifndef GUI_TOUCH_AD_BOTTOM      /* min value returned by AD-converter */
  #define GUI_TOUCH_AD_BOTTOM 220
#endif

#ifndef GUI_TOUCH_SWAP_XY    /* Is XY of touch swapped ? */
  #define GUI_TOUCH_SWAP_XY 0
#endif

#ifndef GUI_TOUCH_MIRROR_X
  #define GUI_TOUCH_MIRROR_X 0
#endif

#ifndef GUI_TOUCH_MIRROR_Y
  #define GUI_TOUCH_MIRROR_Y 0
#endif

#ifndef GUI_TOUCH_YSIZE
  #define GUI_TOUCH_YSIZE LCD_YSIZE
#endif

#ifndef GUI_TOUCH_XSIZE
  #define GUI_TOUCH_XSIZE LCD_XSIZE
#endif

/*********************************************************************
*
*          Config check
*
**********************************************************************
*/


/****************************************************************
*
*       Static data
*
*****************************************************************
*/

typedef struct {int Min; int Max; } tMinMax;
static int xPhys, yPhys;

static tMinMax xyMinMax[2] = {
#if ((GUI_TOUCH_SWAP_XY==0) && (GUI_TOUCH_MIRROR_X==0)) || ((GUI_TOUCH_SWAP_XY) && (GUI_TOUCH_MIRROR_Y==0))
  { GUI_TOUCH_AD_LEFT, GUI_TOUCH_AD_RIGHT },
#else
  { GUI_TOUCH_AD_RIGHT, GUI_TOUCH_AD_LEFT },
#endif
#if ((GUI_TOUCH_SWAP_XY==0) && (GUI_TOUCH_MIRROR_Y==0)) || ((GUI_TOUCH_SWAP_XY) && (GUI_TOUCH_MIRROR_X==0))
  { GUI_TOUCH_AD_TOP,  GUI_TOUCH_AD_BOTTOM }
#else
  { GUI_TOUCH_AD_BOTTOM,  GUI_TOUCH_AD_TOP }
#endif
};

#ifndef WIN32
static int xMin;
static int xMax;
static int yMin;
static int yMax;
#endif



/*********************************************************************
*
*       Convert physical value into (logical) coordinates
*/
int AD2X(int adx) {
  I32 r = adx - xyMinMax[GUI_COORD_X].Min;
  r *= GUI_TOUCH_XSIZE - 1;
  return r / (xyMinMax[GUI_COORD_X].Max - xyMinMax[GUI_COORD_X].Min);    
}

int AD2Y(int ady) {
  I32 r = ady - xyMinMax[GUI_COORD_Y].Min;
  r *= GUI_TOUCH_YSIZE - 1;
  return r/(xyMinMax[GUI_COORD_Y].Max - xyMinMax[GUI_COORD_Y].Min);    
}

/*********************************************************************
*
*        Diagnostic routines
*/
int  GUI_TOUCH_GetxPhys(void) {
  return xPhys;
}

int  GUI_TOUCH_GetyPhys(void) {
  return yPhys;
}



/*********************************************************************
*
*              SetDefaultCalibration
*/

void GUI_TOUCH_SetDefaultCalibration(void) {
  xyMinMax[0].Min = GUI_TOUCH_AD_LEFT;
  xyMinMax[0].Max = GUI_TOUCH_AD_RIGHT;
  xyMinMax[1].Min = GUI_TOUCH_AD_TOP;
  xyMinMax[1].Max = GUI_TOUCH_AD_BOTTOM;
}

/*********************************************************************
*
*              Calibration
*/


static int Log2Phys(int l, I32 l0, I32 l1, I32 p0, I32 p1) {
  return p0+ ((p1-p0) * (l-l0)) / (l1-l0);
}

int GUI_TOUCH_Calibrate(int Coord, int Log0, int Log1, int Phys0, int Phys1) {
  int l0 = 0;
  int l1 = (Coord==GUI_COORD_X) ? LCD_XSIZE-1 : LCD_YSIZE-1;
  if (labs(Phys0-Phys1) < 20)
    return 1;
  if (labs(Log0-Log1) < 20)
    return 1;
  xyMinMax[Coord].Min = Log2Phys(l0, Log0, Log1, Phys0, Phys1);  
  xyMinMax[Coord].Max = Log2Phys(l1, Log0, Log1, Phys0, Phys1);
  return 0;
}

void GUI_TOUCH_GetCalData(int Coord, int* pMin,int* pMax) {
  *pMin = xyMinMax[Coord].Min;
  *pMax = xyMinMax[Coord].Max; 
}
  

/*********************************************************************
*
*              GUI_TOUCH_Exec
*/

void GUI_TOUCH_Exec(void) {
  #ifndef WIN32
  static U8 ReadState;
  int x,y;
  /* calculate Min / Max values */
  if (xyMinMax[GUI_COORD_X].Min < xyMinMax[GUI_COORD_X].Max) {
    xMin = xyMinMax[GUI_COORD_X].Min;
    xMax = xyMinMax[GUI_COORD_X].Max;
  } else {
    xMax = xyMinMax[GUI_COORD_X].Min;
    xMin = xyMinMax[GUI_COORD_X].Max;
  }
  if (xyMinMax[GUI_COORD_Y].Min < xyMinMax[GUI_COORD_Y].Max) {
    yMin = xyMinMax[GUI_COORD_Y].Min;
    yMax = xyMinMax[GUI_COORD_Y].Max;
  } else {
    yMax = xyMinMax[GUI_COORD_Y].Min;
    yMin = xyMinMax[GUI_COORD_Y].Max;
  }
  /* Execute the state machine which reads the touch */
  switch (ReadState) {
  case 0:
    yPhys = TOUCH_X_MeasureY();
    TOUCH_X_ActivateY();  /* Prepare X- measurement */
    ReadState++;
    break;
  default:
    xPhys = TOUCH_X_MeasureX();
    TOUCH_X_ActivateX();  /* Prepare Y- measurement */
    /* Convert values into logical values */
      #if !GUI_TOUCH_SWAP_XY   /* Is X/Y swapped ? */
        x = xPhys;
        y = yPhys;
      #else
        x = yPhys;
        y = xPhys;
      #endif

    if ((x <xMin) | (x>xMax)  | (y <yMin) | (y>yMax)) {
      GUI_TOUCH_StoreUnstable(-1,-1);
    } else {
      x = AD2X(x);
      y = AD2Y(y);
      GUI_TOUCH_StoreUnstable(x,y);
    }
    /* Reset state machine */
    ReadState=0;
    break;
  }
  #endif /* WIN32 */
}


#else
void GUI_TOUCH_DriverAnalog_C(void) {}

#endif    /* defined(GUI_SUPPORT_TOUCH) && GUI_SUPPORT_TOUCH */