mirror of
https://codeberg.org/mclemens/ubitxv6.git
synced 2024-11-02 13:17:20 -04:00
315 lines
8.2 KiB
C++
315 lines
8.2 KiB
C++
#include <Arduino.h>
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#include <EEPROM.h>
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#include "ubitx.h"
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#include "nano_gui.h"
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#include <SPI.h>
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#include <avr/pgmspace.h>
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struct Point ts_point;
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//filled from a test run of calibration routine
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int slope_x=104, slope_y=137, offset_x=28, offset_y=29;
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void readTouchCalibration(){
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EEPROM.get(SLOPE_X, slope_x);
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EEPROM.get(SLOPE_Y, slope_y);
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EEPROM.get(OFFSET_X, offset_x);
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EEPROM.get(OFFSET_Y, offset_y);
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/*
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//for debugging
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Serial.print(slope_x); Serial.print(' ');
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Serial.print(slope_y); Serial.print(' ');
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Serial.print(offset_x); Serial.print(' ');
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Serial.println(offset_y); Serial.println(' ');
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*/
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}
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void writeTouchCalibration(){
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EEPROM.put(SLOPE_X, slope_x);
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EEPROM.put(SLOPE_Y, slope_y);
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EEPROM.put(OFFSET_X, offset_x);
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EEPROM.put(OFFSET_Y, offset_y);
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}
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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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#define SPI_SETTING SPISettings(2000000, MSBFIRST, SPI_MODE0)
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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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static 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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static 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.beginTransaction(SPI_SETTING);
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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.endTransaction();
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//Serial.printf("z=%d :: z1=%d, z2=%d ", z, z1, z2);
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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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boolean readTouch(){
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touch_update();
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if (zraw >= Z_THRESHOLD) {
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ts_point.x = xraw;
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ts_point.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(struct Point *p){
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p->x = ((long)(p->x - offset_x) * 10l)/ (long)slope_x;
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p->y = ((long)(p->y - offset_y) * 10l)/ (long)slope_y;
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// Serial.print(p->x); Serial.print(",");Serial.println(p->y);
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// p->y = ((long)(p->y) * 10l)/(long)(slope_y) - offset_y;
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}
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/*****************
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* Begin TFT functions
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*****************/
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#define ILI9341_CS_PIN TFT_CS
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#define ILI9341_DC_PIN TFT_DC
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#include "PDQ_MinLib/PDQ_ILI9341.h"
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PDQ_ILI9341 tft;
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#include "nano_font.h"
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bool xpt2046_Init(){
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pinMode(CS_PIN, OUTPUT);
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digitalWrite(CS_PIN, HIGH);
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}
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void displayInit(void){
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tft.begin();
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tft.setFont(&ubitx_font);
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tft.setTextWrap(false);
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tft.setTextColor(DISPLAY_GREEN,DISPLAY_BLACK);
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tft.setTextSize(1);
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tft.setRotation(1);
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xpt2046_Init();
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readTouchCalibration();
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}
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void displayPixel(unsigned int x, unsigned int y, unsigned int c){
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tft.drawPixel(x,y,c);
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}
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void displayHline(unsigned int x, unsigned int y, unsigned int w, unsigned int c){
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tft.drawFastHLine(x,y,w,c);
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}
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void displayVline(unsigned int x, unsigned int y, unsigned int l, unsigned int c){
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tft.drawFastVLine(x,y,l,c);
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}
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void displayClear(unsigned int color){
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tft.fillRect(0,0,320,240,color);
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}
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void displayRect(unsigned int x,unsigned int y,unsigned int w,unsigned int h,unsigned int c){
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tft.drawRect(x,y,w,h,c);
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}
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void displayFillrect(unsigned int x,unsigned int y,unsigned int w,unsigned int h,unsigned int c){
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tft.fillRect(x,y,w,h,c);
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}
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void displayChar(int16_t x, int16_t y, unsigned char c, uint16_t color, uint16_t bg) {
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tft.drawCharGFX(x,y,c,color,bg,1);
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}
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void displayRawText(char *text, int x1, int y1, int color, int background){
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tft.setTextColor(color,background);
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tft.setCursor(x1,y1);
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tft.print(text);
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}
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void displayText(char *text, int x1, int y1, int w, int h, int color, int background, int border) {
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displayFillrect(x1, y1, w ,h, background);
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displayRect(x1, y1, w ,h, border);
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int16_t x1_out;
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int16_t y1_out;
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uint16_t width_out;
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uint16_t height_out;
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tft.getTextBounds(text,x1,y1,&x1_out,&y1_out,&width_out,&height_out);
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x1 += (w - ( width_out + (x1_out-x1)))/2;
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y1 += h - (h - height_out)/2;
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displayRawText(text,x1,y1,color,background);
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}
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void setupTouch(){
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int x1, y1, x2, y2, x3, y3, x4, y4;
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displayClear(DISPLAY_BLACK);
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displayText("Click on the cross", 20,100, 200, 50, DISPLAY_WHITE, DISPLAY_BLACK, DISPLAY_BLACK);
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// TOP-LEFT
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displayHline(10,20,20,DISPLAY_WHITE);
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displayVline(20,10,20, DISPLAY_WHITE);
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while(!readTouch())
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delay(100);
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while(readTouch())
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delay(100);
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x1 = ts_point.x;
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y1 = ts_point.y;
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//rubout the previous one
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displayHline(10,20,20,DISPLAY_BLACK);
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displayVline(20,10,20, DISPLAY_BLACK);
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delay(1000);
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//TOP RIGHT
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displayHline(290,20,20,DISPLAY_WHITE);
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displayVline(300,10,20, DISPLAY_WHITE);
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while(!readTouch())
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delay(100);
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while(readTouch())
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delay(100);
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x2 = ts_point.x;
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y2 = ts_point.y;
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displayHline(290,20,20,DISPLAY_BLACK);
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displayVline(300,10,20, DISPLAY_BLACK);
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delay(1000);
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//BOTTOM LEFT
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displayHline(10,220,20,DISPLAY_WHITE);
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displayVline(20,210,20, DISPLAY_WHITE);
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while(!readTouch())
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delay(100);
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x3 = ts_point.x;
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y3 = ts_point.y;
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while(readTouch())
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delay(100);
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displayHline(10,220,20,DISPLAY_BLACK);
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displayVline(20,210,20, DISPLAY_BLACK);
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delay(1000);
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//BOTTOM RIGHT
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displayHline(290,220,20,DISPLAY_WHITE);
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displayVline(300,210,20, DISPLAY_WHITE);
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while(!readTouch())
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delay(100);
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x4 = ts_point.x;
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y4 = ts_point.y;
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displayHline(290,220,20,DISPLAY_BLACK);
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displayVline(300,210,20, DISPLAY_BLACK);
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// we average two readings and divide them by half and store them as scaled integers 10 times their actual, fractional value
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//the x points are located at 20 and 300 on x axis, hence, the delta x is 280, we take 28 instead, to preserve fractional value,
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//there are two readings (x1,x2) and (x3, x4). Hence, we have to divide by 28 * 2 = 56
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slope_x = ((x4 - x3) + (x2 - x1))/56;
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//the y points are located at 20 and 220 on the y axis, hence, the delta is 200. we take it as 20 instead, to preserve the fraction value
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//there are two readings (y1, y2) and (y3, y4). Hence we have to divide by 20 * 2 = 40
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slope_y = ((y3 - y1) + (y4 - y2))/40;
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//x1, y1 is at 20 pixels
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offset_x = x1 + -((20 * slope_x)/10);
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offset_y = y1 + -((20 * slope_y)/10);
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/*
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Serial.print(x1);Serial.print(':');Serial.println(y1);
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Serial.print(x2);Serial.print(':');Serial.println(y2);
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Serial.print(x3);Serial.print(':');Serial.println(y3);
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Serial.print(x4);Serial.print(':');Serial.println(y4);
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//for debugging
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Serial.print(slope_x); Serial.print(' ');
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Serial.print(slope_y); Serial.print(' ');
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Serial.print(offset_x); Serial.print(' ');
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Serial.println(offset_y); Serial.println(' ');
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*/
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writeTouchCalibration();
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displayClear(DISPLAY_BLACK);
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}
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