111 lines
3.1 KiB
C++
111 lines
3.1 KiB
C++
#include "touch.h"
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#include <SPI.h>
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#include "ubitx.h"//pin assignments
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#define Z_THRESHOLD 400
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#define Z_THRESHOLD_INT 75
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#define MSEC_THRESHOLD 3
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static uint32_t msraw=0x80000000;
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static int16_t xraw=0, yraw=0, zraw=0;
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static uint8_t rotation = 1;
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int16_t touch_besttwoavg( int16_t x , int16_t y , int16_t z ) {
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int16_t da, db, dc;
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int16_t reta = 0;
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if ( x > y ) da = x - y; else da = y - x;
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if ( x > z ) db = x - z; else db = z - x;
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if ( z > y ) dc = z - y; else dc = y - z;
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if ( da <= db && da <= dc ) reta = (x + y) >> 1;
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else if ( db <= da && db <= dc ) reta = (x + z) >> 1;
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else reta = (y + z) >> 1; // else if ( dc <= da && dc <= db ) reta = (x + y) >> 1;
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return (reta);
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}
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void touch_update(){
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int16_t data[6];
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uint32_t now = millis();
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if (now - msraw < MSEC_THRESHOLD) return;
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SPI.setClockDivider(SPI_CLOCK_DIV8);//2MHz
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digitalWrite(CS_PIN, LOW);
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SPI.transfer(0xB1 /* Z1 */);
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int16_t z1 = SPI.transfer16(0xC1 /* Z2 */) >> 3;
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int z = z1 + 4095;
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int16_t z2 = SPI.transfer16(0x91 /* X */) >> 3;
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z -= z2;
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if (z >= Z_THRESHOLD) {
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SPI.transfer16(0x91 /* X */); // dummy X measure, 1st is always noisy
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data[0] = SPI.transfer16(0xD1 /* Y */) >> 3;
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data[1] = SPI.transfer16(0x91 /* X */) >> 3; // make 3 x-y measurements
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data[2] = SPI.transfer16(0xD1 /* Y */) >> 3;
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data[3] = SPI.transfer16(0x91 /* X */) >> 3;
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}
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else data[0] = data[1] = data[2] = data[3] = 0; // Compiler warns these values may be used unset on early exit.
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data[4] = SPI.transfer16(0xD0 /* Y */) >> 3; // Last Y touch power down
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data[5] = SPI.transfer16(0) >> 3;
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digitalWrite(CS_PIN, HIGH);
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SPI.setClockDivider(SPI_CLOCK_DIV2);//Return to full speed for TFT
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if (z < 0) z = 0;
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if (z < Z_THRESHOLD) { // if ( !touched ) {
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// Serial.println();
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zraw = 0;
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return;
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}
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zraw = z;
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int16_t x = touch_besttwoavg( data[0], data[2], data[4] );
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int16_t y = touch_besttwoavg( data[1], data[3], data[5] );
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//Serial.printf(" %d,%d", x, y);
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//Serial.println();
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if (z >= Z_THRESHOLD) {
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msraw = now; // good read completed, set wait
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switch (rotation) {
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case 0:
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xraw = 4095 - y;
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yraw = x;
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break;
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case 1:
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xraw = x;
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yraw = y;
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break;
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case 2:
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xraw = y;
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yraw = 4095 - x;
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break;
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default: // 3
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xraw = 4095 - x;
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yraw = 4095 - y;
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}
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}
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}
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void initTouch(){
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pinMode(CS_PIN, OUTPUT);
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digitalWrite(CS_PIN, HIGH);
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}
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bool readTouch(Point *const touch_point_out){
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touch_update();
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if (zraw >= Z_THRESHOLD) {
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touch_point_out->x = xraw;
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touch_point_out->y = yraw;
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//Serial.print(ts_point.x); Serial.print(",");Serial.println(ts_point.y);
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return true;
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}
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return false;
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}
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void scaleTouch(Point *const touch_point_in_out){
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touch_point_in_out->x = ((long)(touch_point_in_out->x - globalSettings.touchOffsetX) * 10L)/ (long)globalSettings.touchSlopeX;
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touch_point_in_out->y = ((long)(touch_point_in_out->y - globalSettings.touchOffsetY) * 10L)/ (long)globalSettings.touchSlopeY;
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//Serial.print(p->x); Serial.print(",");Serial.println(p->y);
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} |