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/*
ChibiOS/GFX - Copyright (C) 2012
Joel Bodenmann aka Tectu <joel@unormal.org>
This file is part of ChibiOS/GFX.
ChibiOS/GFX 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 3 of the License, or
(at your option) any later version.
ChibiOS/GFX 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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file touchpad.c
* @brief Touchpad Driver code.
*
* @addgroup TOUCHPAD
* @{
*/
#include "ch.h"
#include "hal.h"
#include "gdisp.h"
#include "touchpad.h"
#if HAL_USE_TOUCHPAD || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
static volatile struct cal_t cal = {
1, 1, 0, 0
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief returns the uncalibrated readout of the X direction from the controller
*
* @noapi
*/
static uint16_t _tpReadRealX(void) {
uint32_t results = 0;
uint16_t i, x;
/* Median filtering is already done in LLD */
for(i = 0; i < CONVERSIONS; i++) {
results += tp_lld_read_x();
}
/* Take the average of the readings */
x = results / CONVERSIONS;
return x;
}
/**
* @brief return the uncalibrated readout of the Y-direction from the controller
*
* @noapi
*/
static uint16_t _tpReadRealY(void) {
uint32_t results = 0;
uint16_t i, y;
/* Median filtering is already done in LLD */
for(i = 0; i < CONVERSIONS; i++) {
results += tp_lld_read_y();
}
/* Take the average of the readings */
y = results / CONVERSIONS;
return y;
}
/**
* @brief draws a cross. Used for calibration.
*
* @noapi
*/
static void _tpDrawCross(uint16_t x, uint16_t y) {
gdispDrawLine(x-15, y, x-2, y, 0xffff);
gdispDrawLine(x+2, y, x+15, y, 0xffff);
gdispDrawLine(x, y-15, x, y-2, 0xffff);
gdispDrawLine(x, y+2, x, y+15, 0xffff);
gdispDrawLine(x-15, y+15, x-7, y+15, RGB565CONVERT(184,158,131));
gdispDrawLine(x-15, y+7, x-15, y+15, RGB565CONVERT(184,158,131));
gdispDrawLine(x-15, y-15, x-7, y-15, RGB565CONVERT(184,158,131));
gdispDrawLine(x-15, y-7, x-15, y-15, RGB565CONVERT(184,158,131));
gdispDrawLine(x+7, y+15, x+15, y+15, RGB565CONVERT(184,158,131));
gdispDrawLine(x+15, y+7, x+15, y+15, RGB565CONVERT(184,158,131));
gdispDrawLine(x+7, y-15, x+15, y-15, RGB565CONVERT(184,158,131));
gdispDrawLine(x+15, y-15, x+15, y-7, RGB565CONVERT(184,158,131));
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Touchpad Driver initialization.
* @note This function is NOT currently implicitly invoked by @p halInit().
* It must be called manually.
*
* @api
*/
void tpInit(const TOUCHPADDriver *tp) {
/* Initialise Mutex */
//MUTEX_INIT
/* Initialise driver */
//MUTEX_ENTER
tp_lld_init(tp);
//MUTEX_EXIT
#if TOUCHPAD_STORE_CALIBRATION
cal = lld_tpReadCalibration();
#endif
}
/**
* @brief Get the X-Coordinate, relative to screen zero point.
*
* @return The X position in pixels.
*
* @api
*/
uint16_t tpReadX(void) {
uint16_t x, y;
#if TOUCHPAD_XY_INVERTED == TRUE
x = cal.xm * _tpReadRealY() + cal.xn;
y = cal.ym * _tpReadRealX() + cal.yn;
#else
x = cal.xm * _tpReadRealX() + cal.xn;
y = cal.ym * _tpReadRealY() + cal.yn;
#endif
switch(gdispGetOrientation()) {
case GDISP_ROTATE_0:
return x;
case GDISP_ROTATE_90:
return y;
case GDISP_ROTATE_180:
return GDISP_SCREEN_WIDTH - x - 1;
case GDISP_ROTATE_270:
return GDISP_SCREEN_HEIGHT - y - 1;
}
return 0;
}
/**
* @brief Get the X-Coordinate, relative to screen zero point.
*
* @return The Y position in pixels.
*
* @api
*/
uint16_t tpReadY(void) {
uint16_t x, y;
#if TOUCHPAD_XY_INVERTED == TRUE
x = cal.xm * _tpReadRealY() + cal.xn;
y = cal.ym * _tpReadRealX() + cal.yn;
#else
x = cal.xm * _tpReadRealX() + cal.xn;
y = cal.ym * _tpReadRealY() + cal.yn;
#endif
switch(gdispGetOrientation()) {
case GDISP_ROTATE_0:
return y;
case GDISP_ROTATE_90:
return GDISP_SCREEN_WIDTH - x - 1;
case GDISP_ROTATE_180:
return GDISP_SCREEN_HEIGHT - y - 1;
case GDISP_ROTATE_270:
return x;
}
return 0;
}
void tpCalibrate(void) {
const uint16_t h = gdispGetHeight();
const uint16_t w = gdispGetWidth();
const uint16_t cross[2][2] = {{(w/8), (h/8)}, {(w-(w/8)) , (h-(h/8))}};
uint16_t points[2][2];
uint8_t i;
gdispClear(Red);
gdispFillStringBox(0, 10, gdispGetWidth(), 30, "Calibration", &fontUI2Double, White, Red, justifyCenter);
for(i = 0; i < 2; i++) {
_tpDrawCross(cross[i][0], cross[i][1]);
while(!tpIRQ());
points[i][0] = _tpReadRealX();
points[i][1] = _tpReadRealY();
chThdSleepMilliseconds(100);
while(tpIRQ());
gdispFillArea(cross[i][0]-15, cross[i][1]-15, 42, 42, Red);
}
cal.xm = ((float)cross[1][0] - (float)cross[0][0]) / ((float)points[1][0] - (float)points[0][0]);
cal.ym = ((float)cross[1][1] - (float)cross[0][1]) / ((float)points[1][1] - (float)points[0][1]);
cal.xn = (float)cross[0][0] - cal.xm * (float)points[0][0];
cal.yn = (float)cross[0][1] - cal.ym * (float)points[0][1];
#if TOUCHPAD_STORE_CALIBRATION
lld_tpWriteCalibration(cal);
#endif
}
/**
* @brief returns if touchpad is pressed or not
*
* @return 1 if pressed, 0 otherwise
*
* @api
*/
#if TOUCHPAD_HAS_IRQ || defined(__DOXYGEN__)
uint8_t tpIRQ(void) {
return tp_lld_irq();
}
#endif
/**
* @brief Get the pressure.
*
* @return The pressure.
*
* @api
*/
#if TOUCHPAD_HAS_PRESSURE || defined(__DOXYGEN__)
uint16_t tpReadZ(void) {
/* ToDo */
return (tp_lld_read_z());
}
#endif
#endif /* HAL_USE_TOUCHPAD */
/** @} */
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