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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Maurus Cuelenaere
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "button.h"
#include "button-target.h"
#include "touchscreen.h"
#include "string.h"
#include "logf.h"
static enum touchscreen_mode current_mode = TOUCHSCREEN_POINT;
static const int touchscreen_buttons[3][3] =
{
{BUTTON_TOPLEFT, BUTTON_TOPMIDDLE, BUTTON_TOPRIGHT},
{BUTTON_MIDLEFT, BUTTON_CENTER, BUTTON_MIDRIGHT},
{BUTTON_BOTTOMLEFT, BUTTON_BOTTOMMIDDLE, BUTTON_BOTTOMRIGHT}
};
/* Based on ftp://ftp.embedded.com/pub/2002/06vidales/calibrate.c
*
* Copyright (c) 2001, Carlos E. Vidales. All rights reserved.
*
* This sample program was written and put in the public domain
* by Carlos E. Vidales. The program is provided "as is"
* without warranty of any kind, either expressed or implied.
* If you choose to use the program within your own products
* you do so at your own risk, and assume the responsibility
* for servicing, repairing or correcting the program should
* it prove defective in any manner.
* You may copy and distribute the program's source code in any
* medium, provided that you also include in each copy an
* appropriate copyright notice and disclaimer of warranty.
* You may also modify this program and distribute copies of
* it provided that you include prominent notices stating
* that you changed the file(s) and the date of any change,
* and that you do not charge any royalties or licenses for
* its use.
*/
struct touchscreen_parameter
{
long A;
long B;
long C;
long D;
long E;
long F;
long divider;
};
#ifndef DEFAULT_TOUCHSCREEN_CALIBRATION
#define DEFAULT_TOUCHSCREEN_CALIBRATION {.A=1, .B=0, .C=0, \
.D=0, .E=1, .F=0, \
.divider=1}
#endif
static struct touchscreen_parameter calibration_parameters
= DEFAULT_TOUCHSCREEN_CALIBRATION;
static const struct touchscreen_parameter default_parameters
= DEFAULT_TOUCHSCREEN_CALIBRATION;
void touchscreen_disable_mapping(void)
{
calibration_parameters.A = 1;
calibration_parameters.B = 0;
calibration_parameters.C = 0;
calibration_parameters.D = 0;
calibration_parameters.E = 1;
calibration_parameters.F = 0;
calibration_parameters.divider = 1;
}
void touchscreen_reset_mapping(void)
{
memcpy(&calibration_parameters, &default_parameters,
sizeof(struct touchscreen_parameter));
}
int touchscreen_calibrate(struct touchscreen_calibration *cal)
{
calibration_parameters.divider = ((cal->x[0] - cal->x[2]) * (cal->y[1] - cal->y[2])) -
((cal->x[1] - cal->x[2]) * (cal->y[0] - cal->y[2])) ;
if(calibration_parameters.divider == 0)
return -1;
calibration_parameters.A = ((cal->xfb[0] - cal->xfb[2]) * (cal->y[1] - cal->y[2])) -
((cal->xfb[1] - cal->xfb[2]) * (cal->y[0] - cal->y[2])) ;
calibration_parameters.B = ((cal->x[0] - cal->x[2]) * (cal->xfb[1] - cal->xfb[2])) -
((cal->xfb[0] - cal->xfb[2]) * (cal->x[1] - cal->x[2])) ;
calibration_parameters.C = (cal->x[2] * cal->xfb[1] - cal->x[1] * cal->xfb[2]) * cal->y[0] +
(cal->x[0] * cal->xfb[2] - cal->x[2] * cal->xfb[0]) * cal->y[1] +
(cal->x[1] * cal->xfb[0] - cal->x[0] * cal->xfb[1]) * cal->y[2] ;
calibration_parameters.D = ((cal->yfb[0] - cal->yfb[2]) * (cal->y[1] - cal->y[2])) -
((cal->yfb[1] - cal->yfb[2]) * (cal->y[0] - cal->y[2])) ;
calibration_parameters.E = ((cal->x[0] - cal->x[2]) * (cal->yfb[1] - cal->yfb[2])) -
((cal->yfb[0] - cal->yfb[2]) * (cal->x[1] - cal->x[2])) ;
calibration_parameters.F = (cal->x[2] * cal->yfb[1] - cal->x[1] * cal->yfb[2]) * cal->y[0] +
(cal->x[0] * cal->yfb[2] - cal->x[2] * cal->yfb[0]) * cal->y[1] +
(cal->x[1] * cal->yfb[0] - cal->x[0] * cal->yfb[1]) * cal->y[2] ;
logf("A: %lX B: %lX C: %lX", calibration_parameters.A,
calibration_parameters.B, calibration_parameters.C);
logf("D: %lX E: %lX F: %lX", calibration_parameters.D,
calibration_parameters.E, calibration_parameters.F);
logf("divider: %lX", calibration_parameters.divider);
return 0;
}
static void map_pixels(int *x, int *y)
{
int _x = *x, _y = *y;
*x = (calibration_parameters.A*_x + calibration_parameters.B*_y +
calibration_parameters.C) / calibration_parameters.divider;
*y = (calibration_parameters.D*_x + calibration_parameters.E*_y +
calibration_parameters.F) / calibration_parameters.divider;
}
int touchscreen_to_pixels(int x, int y, int *data)
{
x &= 0xFFFF;
y &= 0xFFFF;
map_pixels(&x, &y);
if(current_mode == TOUCHSCREEN_BUTTON)
return touchscreen_buttons[y / (LCD_HEIGHT/3)]
[x / (LCD_WIDTH/3) ];
else
{
*data = (x << 16 | y);
return BUTTON_TOUCHSCREEN;
}
}
void touchscreen_set_mode(enum touchscreen_mode mode)
{
current_mode = mode;
}
enum touchscreen_mode touchscreen_get_mode(void)
{
return current_mode;
}
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