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#include "touchpad.h"
#include "glcd.h"
static struct cal cal;
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(void) {
spiStart(&SPID1, &spicfg);
}
static __inline uint16_t readX(void) {
uint8_t txbuf[1];
uint8_t rxbuf[2];
uint16_t x;
txbuf[0] = 0xd0;
SET_CS(0);
spiSend(&SPID1, 1, txbuf);
spiReceive(&SPID1, 2, rxbuf);
SET_CS(1);
x = rxbuf[0] << 4;
x |= rxbuf[1] >> 4;
return x;
}
static __inline uint16_t readY(void) {
uint8_t txbuf[1];
uint8_t rxbuf[2];
uint16_t y;
txbuf[0] = 0x90;
SET_CS(0);
spiSend(&SPID1, 1, txbuf);
spiReceive(&SPID1, 2, rxbuf);
SET_CS(1);
y = rxbuf[0] << 4;
y |= rxbuf[1] >> 4;
return y;
}
uint8_t tpIRQ(void) {
return (!palReadPad(TP_PORT, TP_IRQ));
}
static uint16_t tpReadRealX(void) {
uint32_t results = 0;
uint16_t i, x;
for(i=0; i<CONVERSIONS; i++) {
readX();
results += readX();
}
x = (((lcdGetHeight()-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++) {
readY();
results += readY();
}
y = (((lcdGetWidth()-1) * (results/CONVERSIONS)) / 2048);
return y;
}
uint16_t tpReadX(void) {
return cal.xm * tpReadRealX() + cal.xn;
}
uint16_t tpReadY(void) {
return cal.ym * tpReadRealY() + cal.yn;
}
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, 0x48368);
lcdDrawLine(x-15, y+7, x-15, y+15, 0x48368);
lcdDrawLine(x-15, y-15, x-7, y-15, 0x48368);
lcdDrawLine(x-15, y-7, x-15, y-15, 0x48368);
lcdDrawLine(x+7, y+15, x+15, y+15, 0x48368);
lcdDrawLine(x+15, y+7, x+15, y+15, 0x48368);
lcdDrawLine(x+7, y-15, x+15, y-15, 0x48368);
lcdDrawLine(x+15, y-15, x+15, y-7, 0x48368);
}
void tpCalibrate(void) {
uint16_t cross[2][2] = {{40,40}, {200, 280}};
uint16_t points[2][2];
uint8_t i;
lcdClear(Red);
lcdDrawString(40, 10, "Touchpad Calibration", White, Red);
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];
}
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