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/*
ChibiOS/RT - 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/>.
*/
#include "touchpad.h"
#include "glcd.h"
volatile static struct cal cal = {
1, 1, 0, 0
};
static const SPIConfig spicfg = {
NULL,
GPIOC,
TP_CS,
SPI_CR1_SPE | SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0,
};
void tpInit(SPIDriver *spip) {
spiStart(spip, &spicfg);
}
uint8_t tpIRQ(void) {
return (!palReadPad(TP_IRQ_PORT, TP_IRQ));
}
static uint16_t tpReadRealX(void) {
uint32_t results = 0;
uint16_t i, x;
for(i=0; i<CONVERSIONS; i++) {
lld_tpReadX();
results += lld_tpReadX();
}
x = (((SCREEN_WIDTH-1) * (results/CONVERSIONS)) / 2048);
return x;
}
static uint16_t tpReadRealY(void) {
uint32_t results = 0;
uint16_t i, y;
for(i=0; i<CONVERSIONS; i++) {
lld_tpReadY();
results += lld_tpReadY();
}
y = (((SCREEN_HEIGHT-1) * (results/CONVERSIONS)) / 2048);
return y;
}
uint16_t tpReadX(void) {
uint16_t x, y;
x = cal.xm * tpReadRealX() + cal.xn;
y = cal.ym * tpReadRealY() + cal.yn;
switch(lcdGetOrientation()) {
case portrait:
return x;
case landscape:
return SCREEN_HEIGHT - y;
case portraitInv:
return SCREEN_WIDTH - x;
case landscapeInv:
return y;
}
return x;
}
uint16_t tpReadY(void) {
uint16_t x, y;
x = cal.xm * tpReadRealX() + cal.xn;
y = cal.ym * tpReadRealY() + cal.yn;
switch(lcdGetOrientation()) {
case portrait:
return y;
case landscape:
return x;
case portraitInv:
return SCREEN_HEIGHT - y;
case landscapeInv:
return SCREEN_WIDTH - x;
}
return y;
}
uint16_t tpReadZ(void) {
return lld_tpReadZ();
}
static void tpDrawCross(uint16_t x, uint16_t y) {
lcdDrawLine(x-15, y, x-2, y, 0xffff);
lcdDrawLine(x+2, y, x+15, y, 0xffff);
lcdDrawLine(x, y-15, x, y-2, 0xffff);
lcdDrawLine(x, y+2, x, y+15, 0xffff);
lcdDrawLine(x-15, y+15, x-7, y+15, RGB565CONVERT(184,158,131));
lcdDrawLine(x-15, y+7, x-15, y+15, RGB565CONVERT(184,158,131));
lcdDrawLine(x-15, y-15, x-7, y-15, RGB565CONVERT(184,158,131));
lcdDrawLine(x-15, y-7, x-15, y-15, RGB565CONVERT(184,158,131));
lcdDrawLine(x+7, y+15, x+15, y+15, RGB565CONVERT(184,158,131));
lcdDrawLine(x+15, y+7, x+15, y+15, RGB565CONVERT(184,158,131));
lcdDrawLine(x+7, y-15, x+15, y-15, RGB565CONVERT(184,158,131));
lcdDrawLine(x+15, y-15, x+15, y-7, RGB565CONVERT(184,158,131));
}
void tpCalibrate(void) {
uint16_t cross[2][2] = {{40,40}, {200, 280}};
uint16_t points[2][2];
uint8_t i;
lcdSetOrientation(portrait);
lcdClear(Red);
/* Abhishek: need to specify a font to use here, should probably make sure it exists somehow */
lcdDrawString(40, 10, "Touchpad Calibration", font_Larger, White, Red, solid);
for(i = 0; i < 2; i++) {
tpDrawCross(cross[i][0], cross[i][1]);
while(!tpIRQ());
points[i][0] = tpReadRealX();
points[i][1] = tpReadRealY();
while(tpIRQ());
lcdFillArea(cross[i][0]-15, cross[i][1]-15, cross[i][0]+16, cross[i][1]+16, 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];
lcdSetWindow(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
}
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