262 lines
6.7 KiB
C
262 lines
6.7 KiB
C
/*
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ChibiOS-LCD-Driver - Copyright (C) 2012
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Joel Bodenmann aka Tectu <joel@unormal.org>
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This file is part of ChibiOS-LCD-Driver.
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ChibiOS-LCD-Driver is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS-LCD-Driver is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file touchpad.c
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* @brief Touchpad Driver code.
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*
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* @addgroup TOUCHPAD
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#include "gdisp.h"
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#include "touchpad.h"
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#if HAL_USE_TOUCHPAD || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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#ifdef UNUSED
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#elif defined(__GNUC__)
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# define UNUSED(x) UNUSED_ ## x __attribute__((unused))
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#elif defined(__LCLINT__)
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# define UNUSED(x) /*@unused@*/ x
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#else
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# define UNUSED(x) x
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#endif
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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volatile static struct cal cal = {
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1, 1, 0, 0
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};
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/**
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* @brief returns the uncalibrated readout of the X direction from the controller
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*
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* @noapi
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*/
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static uint16_t _tpReadRealX(void) {
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uint32_t results = 0;
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uint16_t i, x;
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for(i = 0; i < CONVERSIONS; i++) {
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tp_lld_read_x(); /* dummy, reduce noise on SPI */
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results += tp_lld_read_x();
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}
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// 12-bit
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x = (((SCREEN_WIDTH-1) * (results/CONVERSIONS)) / 2048);
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return x;
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}
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/**
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* @brief return the uncalibrated readout of the Y-direction from the controller
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*
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* @noapi
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*/
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static uint16_t _tpReadRealY(void) {
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uint32_t results = 0;
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uint16_t i, y;
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for(i = 0; i < CONVERSIONS; i++) {
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tp_lld_read_y(); /* dummy, reduce noise on SPI */
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results += tp_lld_read_y();
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}
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// 12-bit
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y = (((SCREEN_HEIGHT-1) * (results/CONVERSIONS)) / 2048);
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return y;
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}
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/**
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* @brief draws a cross. Used for calibration.
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*
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* @noapi
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*/
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static void _tpDrawCross(uint16_t x, uint16_t y) {
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gdispDrawLine(x-15, y, x-2, y, 0xffff);
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gdispDrawLine(x+2, y, x+15, y, 0xffff);
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gdispDrawLine(x, y-15, x, y-2, 0xffff);
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gdispDrawLine(x, y+2, x, y+15, 0xffff);
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gdispDrawLine(x-15, y+15, x-7, y+15, RGB565CONVERT(184,158,131));
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gdispDrawLine(x-15, y+7, x-15, y+15, RGB565CONVERT(184,158,131));
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gdispDrawLine(x-15, y-15, x-7, y-15, RGB565CONVERT(184,158,131));
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gdispDrawLine(x-15, y-7, x-15, y-15, RGB565CONVERT(184,158,131));
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gdispDrawLine(x+7, y+15, x+15, y+15, RGB565CONVERT(184,158,131));
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gdispDrawLine(x+15, y+7, x+15, y+15, RGB565CONVERT(184,158,131));
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gdispDrawLine(x+7, y-15, x+15, y-15, RGB565CONVERT(184,158,131));
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gdispDrawLine(x+15, y-15, x+15, y-7, RGB565CONVERT(184,158,131));
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}
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Touchpad Driver initialization.
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* @note This function is NOT currently implicitly invoked by @p halInit().
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* It must be called manually.
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*
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* @api
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*/
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void tpInit(TOUCHPADDriver *tp) {
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/* Initialise Mutex */
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//MUTEX_INIT
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/* Initialise driver */
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//MUTEX_ENTER
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tp_lld_init(tp);
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//MUTEX_EXIT
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}
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/**
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* @brief Get the X-Coordinate, relative to screen zero point.
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*
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* @return The X position in pixels.
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*
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* @api
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*/
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uint16_t tpReadX(void) {
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uint16_t x, y;
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x = cal.xm * _tpReadRealX() + cal.xn;
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y = cal.ym * _tpReadRealY() + cal.yn;
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/*
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switch(gdispGetOrientation()) { // implement gdispGetOrientation()
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case portrait:
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return x;
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case landscape:
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return SCREEN_HEIGHT - y;
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case portraitInv:
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return SCREEN_WIDTH - x;
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case landscapeInv:
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return y;
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}
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*/
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return x;
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}
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/**
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* @brief Get the X-Coordinate, relative to screen zero point.
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*
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* @return The Y position in pixels.
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*
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* @api
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*/
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uint16_t tpReadY(void) {
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uint16_t x, y;
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x = cal.xm * _tpReadRealX() + cal.xn;
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y = cal.ym * _tpReadRealY() + cal.yn;
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/*
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switch(gdispGetOrientation()) { // implement gdispGetOrientation()
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case portrait:
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return y;
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case landscape:
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return x;
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case portraitInv:
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return SCREEN_HEIGHT - y;
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case landscapeInv:
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return SCREEN_WIDTH - x;
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}
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*/
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return y;
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}
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void tpCalibrate(void) {
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uint16_t cross[2][2] = {{40,50}, {200, 280}};
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uint16_t points[2][2];
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uint8_t i;
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//gdispSetOrientation(portrait);
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gdispClear(Red);
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gdispFillStringBox(0, 10, gdispGetWidth(), 30, "Calibration", &fontUI2Double, White, Red, justifyCenter);
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for(i = 0; i < 2; i++) {
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_tpDrawCross(cross[i][0], cross[i][1]);
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while(!tpIRQ());
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points[i][0] = _tpReadRealX();
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points[i][1] = _tpReadRealY();
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chThdSleepMilliseconds(100);
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while(tpIRQ());
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gdispFillArea(cross[i][0]-15, cross[i][1]-15, 42, 42, Red);
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}
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cal.xm = ((float)cross[1][0] - (float)cross[0][0]) / ((float)points[1][0] - (float)points[0][0]);
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cal.ym = ((float)cross[1][1] - (float)cross[0][1]) / ((float)points[1][1] - (float)points[0][1]);
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cal.xn = (float)cross[0][0] - cal.xm * (float)points[0][0];
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cal.yn = (float)cross[0][1] - cal.ym * (float)points[0][1];
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}
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#if TOUCHPAD_HAS_IRQ || defined(__DOXYGEN__)
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/**
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* @brief returns if touchpad is pressed or not
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*
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* @return 1 if pressed, 0 otherwise
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*
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* @api
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*/
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uint8_t tpIRQ(void) {
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return tp_lld_irq();
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}
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#endif
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#if TOUCHPAD_HAS_PRESSURE || defined(__DOXYGEN__)
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/**
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* @brief Get the pressure.
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*
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* @return The pressure.
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*
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* @api
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*/
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uint16_t tpReadZ(void) {
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/* ToDo */
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return (tp_lld_read_z());
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}
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#endif
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#endif /* HAL_USE_TOUCHPAD */
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/** @} */
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