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/*
ChibiOS-LCD-Driver - Copyright (C) 2012
Joel Bodenmann aka Tectu <joel@unormal.org>
This file is part of ChibiOS-LCD-Driver.
ChibiOS-LCD-Driver 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-LCD-Driver 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. */
/*===========================================================================*/
#ifdef UNUSED
#elif defined(__GNUC__)
# define UNUSED(x) UNUSED_ ## x __attribute__((unused))
#elif defined(__LCLINT__)
# define UNUSED(x) /*@unused@*/ x
#else
# define UNUSED(x) x
#endif
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
volatile static struct cal 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;
for(i = 0; i < CONVERSIONS; i++) {
tp_lld_read_x(); /* dummy, reduce noise on SPI */
results += tp_lld_read_x();
}
x = (((SCREEN_WIDTH-1) * (results/CONVERSIONS)) / 2048);
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;
for(i = 0; i < CONVERSIONS; i++) {
tp_lld_read_y(); /* dummy, reduce noise on SPI */
results += tp_lld_read_y();
}
y = (((SCREEN_HEIGHT-1) * (results/CONVERSIONS)) / 2048);
return y;
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Touchpad Driver initialization.
* @note This function is NOT currently implicitly invoked by @p halInit().
* It must be called manually.
*
* @init
*/
void tpInit(TOUCHPADDriver *tp) {
/* Initialise Mutex */
//MUTEX_INIT
/* Initialise driver */
//MUTEX_ENTER
tp_lld_init(tp);
//MUTEX_EXIT
}
/**
* @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;
x = cal.xm * _tpReadRealX() + cal.xn;
y = cal.ym * _tpReadRealY() + cal.yn;
/*
switch(gdispGetOrientation()) { // implement gdispGetOrientation()
case portrait:
return x;
case landscape:
return SCREEN_HEIGHT - y;
case portraitInv:
return SCREEN_WIDTH - x;
case landscapeInv:
return y;
}
*/
return x;
}
/**
* @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;
x = cal.xm * _tpReadRealX() + cal.xn;
y = cal.ym * _tpReadRealY() + cal.yn;
/*
switch(gdispGetOrientation()) { // implement gdispGetOrientation()
case portrait:
return y;
case landscape:
return x;
case portraitInv:
return SCREEN_HEIGHT - y;
case landscapeInv:
return SCREEN_WIDTH - x;
}
*/
return y;
}
#if TOUCHPAD_PRESSURE || defined(__DOXYGEN__)
/**
* @brief Get the pressure.
*
* @return The pressure.
*
* @api
*/
uint16_t tpReadZ(void) {
/* ToDo */
return (tp_lld_read_z());
}
#endif
#endif /* HAL_USE_TOUCHPAD */
/** @} */
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