ubitxv6/touch.cpp

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#include "touch.h"
#include <SPI.h>
#include "pin_definitions.h"
#include "settings.h"
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constexpr int16_t Z_THRESHOLD = 400;
constexpr uint8_t MSEC_THRESHOLD = 3;
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uint32_t msraw=0x80000000;
int16_t xraw=0, yraw=0, zraw=0;
constexpr uint8_t rotation = 1;
SPISettings spiSettingsTouch(2000000,MSBFIRST,SPI_MODE0);
int16_t touch_besttwoavg( int16_t x , int16_t y , int16_t z ) {
int16_t da, db, dc;
int16_t reta = 0;
if ( x > y ) da = x - y; else da = y - x;
if ( x > z ) db = x - z; else db = z - x;
if ( z > y ) dc = z - y; else dc = y - z;
if ( da <= db && da <= dc ) reta = (x + y) >> 1;
else if ( db <= da && db <= dc ) reta = (x + z) >> 1;
else reta = (y + z) >> 1; // else if ( dc <= da && dc <= db ) reta = (x + y) >> 1;
return (reta);
}
void touch_update(){
int16_t data[6];
uint32_t now = millis();
if (now - msraw < MSEC_THRESHOLD) return;
SPI.beginTransaction(spiSettingsTouch);
digitalWrite(PIN_TOUCH_CS, LOW);
SPI.transfer(0xB1 /* Z1 */);
int16_t z1 = SPI.transfer16(0xC1 /* Z2 */) >> 3;
int z = z1 + 4095;
int16_t z2 = SPI.transfer16(0x91 /* X */) >> 3;
z -= z2;
if (z < 0) z = 0;
if (z < Z_THRESHOLD) { // if ( !touched ) {
// Serial.println();
zraw = 0;
digitalWrite(PIN_TOUCH_CS, HIGH);
SPI.endTransaction();
return;
}
zraw = z;
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SPI.transfer16(0x91 /* X */); // dummy X measure, 1st is always noisy
data[0] = SPI.transfer16(0xD1 /* Y */) >> 3;
data[1] = SPI.transfer16(0x91 /* X */) >> 3; // make 3 x-y measurements
data[2] = SPI.transfer16(0xD1 /* Y */) >> 3;
data[3] = SPI.transfer16(0x91 /* X */) >> 3;
data[4] = SPI.transfer16(0xD0 /* Y */) >> 3; // Last Y touch power down
data[5] = SPI.transfer16(0) >> 3;
digitalWrite(PIN_TOUCH_CS, HIGH);
SPI.endTransaction();
int16_t x = touch_besttwoavg( data[0], data[2], data[4] );
int16_t y = touch_besttwoavg( data[1], data[3], data[5] );
//Serial.printf(" %d,%d", x, y);
//Serial.println();
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msraw = now; // good read completed, set wait
switch (rotation) {
case 0:
xraw = 4095 - y;
yraw = x;
break;
case 1:
xraw = x;
yraw = y;
break;
case 2:
xraw = y;
yraw = 4095 - x;
break;
default: // 3
xraw = 4095 - x;
yraw = 4095 - y;
}
}
void initTouch(){
pinMode(PIN_TOUCH_CS, OUTPUT);
digitalWrite(PIN_TOUCH_CS, HIGH);
}
bool readTouch(Point *const touch_point_out){
touch_update();
if (zraw >= Z_THRESHOLD) {
touch_point_out->x = xraw;
touch_point_out->y = yraw;
//Serial.print(ts_point.x); Serial.print(",");Serial.println(ts_point.y);
return true;
}
return false;
}
void scaleTouch(Point *const touch_point_in_out){
touch_point_in_out->x = ((long)(touch_point_in_out->x - globalSettings.touchOffsetX) * 10L)/ (long)globalSettings.touchSlopeX;
touch_point_in_out->y = ((long)(touch_point_in_out->y - globalSettings.touchOffsetY) * 10L)/ (long)globalSettings.touchSlopeY;
//Serial.print(p->x); Serial.print(",");Serial.println(p->y);
}