370 lines
10 KiB
C
370 lines
10 KiB
C
/* ChibiOS/GFX - Copyright (C) 2012
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Joel Bodenmann aka Tectu <joel@unormal.org>
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This file is part of ChibiOS/GFX.
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ChibiOS/GFX 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/GFX 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 src/touchscreen.c
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* @brief Touchscreen Driver code.
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*
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* @addtogroup TOUCHSCREEN
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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 "touchscreen.h"
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#if GFX_USE_TOUCHSCREEN || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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static struct cal_t *cal;
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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static coord_t _tsReadRealX(void) {
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int32_t results = 0;
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int16_t i;
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coord_t x;
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for(i = 0; i < TOUCHSCREEN_CONVERSIONS; i++) {
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results += ts_lld_read_x();
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}
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/* Take the average of the readings */
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x = results / TOUCHSCREEN_CONVERSIONS;
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return x;
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}
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static coord_t _tsReadRealY(void) {
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int32_t results = 0;
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int16_t i;
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coord_t y;
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for(i = 0; i < TOUCHSCREEN_CONVERSIONS; i++) {
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results += ts_lld_read_y();
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}
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/* Take the average of the readings */
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y = results / TOUCHSCREEN_CONVERSIONS;
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return y;
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}
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static void _tsDrawCross(uint16_t x, uint16_t y) {
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gdispDrawLine(x-15, y, x-2, y, White);
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gdispDrawLine(x+2, y, x+15, y, White);
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gdispDrawLine(x, y-15, x, y-2, White);
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gdispDrawLine(x, y+2, x, y+15, White);
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gdispDrawLine(x-15, y+15, x-7, y+15, RGB2COLOR(184,158,131));
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gdispDrawLine(x-15, y+7, x-15, y+15, RGB2COLOR(184,158,131));
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gdispDrawLine(x-15, y-15, x-7, y-15, RGB2COLOR(184,158,131));
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gdispDrawLine(x-15, y-7, x-15, y-15, RGB2COLOR(184,158,131));
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gdispDrawLine(x+7, y+15, x+15, y+15, RGB2COLOR(184,158,131));
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gdispDrawLine(x+15, y+7, x+15, y+15, RGB2COLOR(184,158,131));
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gdispDrawLine(x+7, y-15, x+15, y-15, RGB2COLOR(184,158,131));
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gdispDrawLine(x+15, y-15, x+15, y-7, RGB2COLOR(184,158,131));
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}
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static void _tsTransform(coord_t *x, coord_t *y) {
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*x = (coord_t) (cal->ax * (*x) + cal->bx * (*y) + cal->cx);
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*y = (coord_t) (cal->ay * (*x) + cal->by * (*y) + cal->cy);
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}
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static void _tsDo3PointCalibration(const coord_t (*cross)[2], coord_t (*points)[2], cal_t *c) {
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float dx, dx0, dx1, dx2, dy0, dy1, dy2;
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/* Compute all the required determinants */
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dx = ((float)(points[0][0] - points[2][0])) * ((float)(points[1][1] - points[2][1]))
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- ((float)(points[1][0] - points[2][0])) * ((float)(points[0][1] - points[2][1]));
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dx0 = ((float)(cross[0][0] - cross[2][0])) * ((float)(points[1][1] - points[2][1]))
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- ((float)(cross[1][0] - cross[2][0])) * ((float)(points[0][1] - points[2][1]));
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dx1 = ((float)(points[0][0] - points[2][0])) * ((float)(cross[1][0] - cross[2][0]))
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- ((float)(points[1][0] - points[2][0])) * ((float)(cross[0][0] - cross[2][0]));
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dx2 = cross[0][0] * ((float)points[1][0] * (float)points[2][1] - (float)points[2][0] * (float)points[1][1]) -
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cross[1][0] * ((float)points[0][0] * (float)points[2][1] - (float)points[2][0] * (float)points[0][1]) +
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cross[2][0] * ((float)points[0][0] * (float)points[1][1] - (float)points[1][0] * (float)points[0][1]);
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dy0 = ((float)(cross[0][1] - cross[2][1])) * ((float)(points[1][1] - points[2][1]))
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- ((float)(cross[1][1] - cross[2][1])) * ((float)(points[0][1] - points[2][1]));
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dy1 = ((float)(points[0][0] - points[2][0])) * ((float)(cross[1][1] - cross[2][1]))
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- ((float)(points[1][0] - points[2][0])) * ((float)(cross[0][1] - cross[2][1]));
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dy2 = cross[0][1] * ((float)points[1][0] * (float)points[2][1] - (float)points[2][0] * (float)points[1][1]) -
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cross[1][1] * ((float)points[0][0] * (float)points[2][1] - (float)points[2][0] * (float)points[0][1]) +
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cross[2][1] * ((float)points[0][0] * (float)points[1][1] - (float)points[1][0] * (float)points[0][1]);
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/* Now, calculate all the required coefficients */
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c->ax = dx0 / dx;
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c->bx = dx1 / dx;
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c->cx = dx2 / dx;
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c->ay = dy0 / dx;
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c->by = dy1 / dx;
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c->cy = dy2 / dx;
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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 Touchscreen Driver initialization.
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* @note Calling this function automatically invokes a tsCalibration()
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*
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* @param[in] ts The touchscreen driver struct
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*
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* @api
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*/
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void tsInit(const TouchscreenDriver *ts) {
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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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ts_lld_init(ts);
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//MUTEX_EXIT
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#if TOUCHSCREEN_STORE_CALIBRATION
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cal = ts_restore_calibration_lld();
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if(cal != NULL)
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return; // All done
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#endif
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cal = (struct cal_t*)chHeapAlloc(NULL, sizeof(struct cal_t));
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if(cal == NULL)
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return;
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tsCalibrate();
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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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coord_t tsReadX(void) {
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coord_t x, y;
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#if TOUCHSCREEN_XY_INVERTED
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x = _tsReadRealY();
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y = _tsReadRealX();
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#else
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x = _tsReadRealX();
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y = _tsReadRealY();
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#endif
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_tsTransform(&x, &y);
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switch(gdispGetOrientation()) {
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case GDISP_ROTATE_0:
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return x;
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case GDISP_ROTATE_90:
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return y;
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case GDISP_ROTATE_180:
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return gdispGetWidth() - x - 1;
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case GDISP_ROTATE_270:
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return gdispGetWidth() - y - 1;
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}
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return 0;
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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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coord_t tsReadY(void) {
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coord_t x, y;
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#if TOUCHSCREEN_XY_INVERTED
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x = _tsReadRealY();
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y = _tsReadRealX();
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#else
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x = _tsReadRealX();
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y = _tsReadRealY();
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#endif
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_tsTransform(&x, &y);
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switch(gdispGetOrientation()) {
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case GDISP_ROTATE_0:
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return y;
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case GDISP_ROTATE_90:
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return gdispGetHeight() - x - 1;
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case GDISP_ROTATE_180:
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return gdispGetHeight() - y - 1;
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case GDISP_ROTATE_270:
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return x;
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}
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return 0;
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}
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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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#if TOUCHSCREEN_HAS_PRESSURE || defined(__DOXYGEN__)
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uint16_t tsReadZ(void) {
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/* ToDo */
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return (ts_lld_read_z());
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}
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#endif
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/**
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* @brief Returns if touchscreen is pressed or not
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*
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* @return TRUE if pressed, FALSE otherwise
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*
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* @api
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*/
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#if TOUCHSCREEN_HAS_PRESSED || defined(__DOXYGEN__)
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bool_t tsPressed(void) {
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return ts_lld_pressed();
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}
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#endif
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/* Define maximum no. of times to sample the calibration point */
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#define MAX_CAL_SAMPLES 10
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/**
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* @brief Function to calibrate touchscreen
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* @details This function interactively performs calibration of the touchscreen
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* using 3-point calibration algorithm. Optionally, it also verifies
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* the accuracy of the calibration coefficients obtained if the symbol
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* TOUCHSCREEN_VERIFY_CALIBRATION is defined in the configuration.
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*
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* @note You don't have to call this function manually. It gets invoked by tsInit()
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*
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* @api
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*/
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void tsCalibrate(void) {
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const uint16_t height = gdispGetHeight();
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const uint16_t width = gdispGetWidth();
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const coord_t cross[][2] = {{(width / 4), (height / 4)},
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{(width - (width / 4)) , (height / 4)},
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{(width - (width / 4)) , (height - (height / 4))},
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{(width / 2), (height / 2)}}; /* Check point */
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coord_t points[4][2];
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int32_t px, py;
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uint8_t i, j;
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#if GDISP_NEED_CONTROL
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gdispSetOrientation(GDISP_ROTATE_0);
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#endif
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gdispClear(Blue);
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gdispFillStringBox(0, 5, gdispGetWidth(), 30, "Calibration", &fontUI2Double, White, Blue, justifyCenter);
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#if TOUCHSCREEN_VERIFY_CALIBRATION
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calibrate:
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for(i = 0; i < 4; i++) {
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#else
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for(i = 0; i < 3; i++) {
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#endif
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_tsDrawCross(cross[i][0], cross[i][1]);
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while(!tsPressed())
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chThdSleepMilliseconds(2); /* Be nice to other threads*/
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chThdSleepMilliseconds(20); /* Allow screen to settle */
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/* Take a little more samples per point and their average
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* for precise calibration */
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px = py = 0;
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j = 0;
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while(j < MAX_CAL_SAMPLES) {
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if(tsPressed()) { /* We have valid pointer data */
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#if TOUCHSCREEN_XY_INVERTED
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py += _tsReadRealX();
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px += _tsReadRealY();
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#else
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px += _tsReadRealX();
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py += _tsReadRealY();
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#endif
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j++;
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}
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}
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points[i][0] = px / j;
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points[i][1] = py / j;
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chThdSleepMilliseconds(100);
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while(tsPressed())
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chThdSleepMilliseconds(2); /* Be nice to other threads*/
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gdispFillArea(cross[i][0] - 15, cross[i][1] - 15, 42, 42, Blue);
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}
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/* Apply 3 point calibration algorithm */
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_tsDo3PointCalibration(cross, points, cal);
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#if TOUCHSCREEN_VERIFY_CALIBRATION
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/* Verification of correctness of calibration (optional) :
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* See if the 4th point (Middle of the screen) coincides with the calibrated
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* result. If point is with +/- 2 pixel margin, then successful calibration
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* Else, start from the beginning.
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*/
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/* Transform the co-ordinates */
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_tpTransform(&points[3][0], &points[3][1]);
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/* Calculate the delta */
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px = (points[3][0] - cross[3][0]) * (points[3][0] - cross[3][0]) +
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(points[3][1] - cross[3][1]) * (points[3][1] - cross[3][1]);
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if(px > 4)
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goto calibrate;
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#endif
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/* If enabled, serialize the calibration values for storage */
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#if TOUCHSCREEN_STORE_CALIBRATION
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ts_store_calibration_lld(cal);
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#endif
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}
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#endif /* GFX_USE_TOUCHSCREEN */
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/** @} */
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