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added basic calibration routine

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Tectu 2012-06-03 17:52:02 +02:00
parent 764c273975
commit 20345ef765
2 changed files with 64 additions and 4 deletions
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67
touchpad.c
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@ -1,6 +1,8 @@
#include "touchpad.h"
#include "glcd.h"
static int16_t x_cal, y_cal;
static void spicb(SPIDriver *spip);
static const SPIConfig spicfg = {
NULL,
@ -47,8 +49,12 @@ static __inline uint16_t readY(void) {
return y;
}
uint8_t __inline tpIRQ(void) {
return (!palReadPad(TP_PORT, TP_IRQ));
}
uint16_t tpReadX(void) {
uint32_t results;
uint32_t results = 0;
uint16_t i, x;
for(i=0; i<CONVERSIONS; i++) {
@ -58,11 +64,11 @@ uint16_t tpReadX(void) {
x = (((lcdGetHeight()-1) * (results/CONVERSIONS)) / 2048);
return x;
return x + x_cal;
}
uint16_t tpReadY(void) {
uint32_t results;
uint32_t results = 0;
uint16_t i, y;
for(i=0; i<CONVERSIONS; i++) {
@ -72,7 +78,60 @@ uint16_t tpReadY(void) {
y = (((lcdGetWidth()-1) * (results/CONVERSIONS)) / 2048);
return y;
return y + y_cal;
}
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[3][2] = {{20,40}, {220,160}, {50,300}};
uint16_t cal[3][2];
uint8_t i, j;
int16_t a, b;
unsigned char buffer[32];
lcdClear(Red);
lcdDrawString(40, 10, "Touchpad Calibration", White, Red);
for(i=0; i<3; i++) {
tpDrawCross(cross[i][0], cross[i][1]);
while(!tpIRQ());
cal[i][0] = tpReadX();
cal[i][1] = tpReadY();
while(tpIRQ());
}
for(i=0, j=0; i<3; i++) {
sprintf(buffer, "X: %d", cal[i][0]);
lcdDrawString(100, 100+(i*20)+j, buffer, White, Red);
sprintf(buffer, "Y: %d", cal[i][1]);
lcdDrawString(100, 120+(i*20)+j, buffer, White, Red);
j += 40;
}
for(a=0, b=0, i=0; i<3; i++) {
a += (cross[i][0] - cal[i][0]);
b += (cross[i][1] - cal[i][1]);
}
x_cal = (a / 3);
y_cal = (b / 3);
}

1
touchpad.h
View file

@ -10,6 +10,7 @@
void tpInit(void);
void tpWriteData(uint8_t data);
void tpDrawCross(uint16_t x, uint16_t y);
uint16_t tpReadData(void);
uint16_t tpReadX(void);
uint16_t tpReadY(void);