/*******************************************************************************
  * Touch Calibration tool for helping other example touchscreen support
  *
  * For resistive touchscreen, you can follow the display hint for calibration.
  * And then copy the serial output result to touch.h.
  *
  * For capacitive touchscreen, it should no need to calibrate.
  * This tool just help you check the connection and orientation.
  *
  * Resistive touchscreen libraries
  * XPT2046: https://github.com/PaulStoffregen/XPT2046_Touchscreen.git
  * 
  * Capacitive touchscreen libraries
  * TouchLib: https://github.com/mmMicky/TouchLib.git
  ******************************************************************************/
 
 /*******************************************************************************
  * Please config the touch panel in touch.h
  ******************************************************************************/
 #include "touch.h"
 
 /*******************************************************************************
  * Start of Arduino_GFX setting
  *
  * Arduino_GFX try to find the settings depends on selected board in Arduino IDE
  * Or you can define the display dev kit not in the board list
  * Defalult pin list for non display dev kit:
  * Arduino Nano, Micro and more: CS:  9, DC:  8, RST:  7, BL:  6, SCK: 13, MOSI: 11, MISO: 12
  * ESP32 various dev board     : CS:  5, DC: 27, RST: 33, BL: 22, SCK: 18, MOSI: 23, MISO: nil
  * ESP32-C3 various dev board  : CS:  7, DC:  2, RST:  1, BL:  3, SCK:  4, MOSI:  6, MISO: nil
  * ESP32-S2 various dev board  : CS: 34, DC: 38, RST: 33, BL: 21, SCK: 36, MOSI: 35, MISO: nil
  * ESP32-S3 various dev board  : CS: 40, DC: 41, RST: 42, BL: 48, SCK: 36, MOSI: 35, MISO: nil
  * ESP8266 various dev board   : CS: 15, DC:  4, RST:  2, BL:  5, SCK: 14, MOSI: 13, MISO: 12
  * Raspberry Pi Pico dev board : CS: 17, DC: 27, RST: 26, BL: 28, SCK: 18, MOSI: 19, MISO: 16
  * RTL8720 BW16 old patch core : CS: 18, DC: 17, RST:  2, BL: 23, SCK: 19, MOSI: 21, MISO: 20
  * RTL8720_BW16 Official core  : CS:  9, DC:  8, RST:  6, BL:  3, SCK: 10, MOSI: 12, MISO: 11
  * RTL8722 dev board           : CS: 18, DC: 17, RST: 22, BL: 23, SCK: 13, MOSI: 11, MISO: 12
  * RTL8722_mini dev board      : CS: 12, DC: 14, RST: 15, BL: 13, SCK: 11, MOSI:  9, MISO: 10
  * Seeeduino XIAO dev board    : CS:  3, DC:  2, RST:  1, BL:  0, SCK:  8, MOSI: 10, MISO:  9
  * Teensy 4.1 dev board        : CS: 39, DC: 41, RST: 40, BL: 22, SCK: 13, MOSI: 11, MISO: 12
  ******************************************************************************/
 #include <Arduino_GFX_Library.h>
 
 #define GFX_BL DF_GFX_BL // default backlight pin, you may replace DF_GFX_BL to actual backlight pin
 
 /* More dev device declaration: https://github.com/moononournation/Arduino_GFX/wiki/Dev-Device-Declaration */
 #if defined(DISPLAY_DEV_KIT)
 Arduino_GFX *gfx = create_default_Arduino_GFX();
 #else /* !defined(DISPLAY_DEV_KIT) */
 
 /* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
 Arduino_DataBus *bus = create_default_Arduino_DataBus();
 
 /* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
 Arduino_GFX *gfx = new Arduino_ILI9341(bus, DF_GFX_RST, 0 /* rotation */, false /* IPS */);
 
 #endif /* !defined(DISPLAY_DEV_KIT) */
 /*******************************************************************************
  * End of Arduino_GFX setting
  ******************************************************************************/
 
 int16_t w = -1, h = -1;
 int16_t point_x[4] = {-1};
 int16_t point_y[4] = {-1};
 int16_t current_point = -1, next_point = 0;
 int16_t touched_x[4] = {-1};
 int16_t touched_y[4] = {-1};
 
 void setup(void)
 {
   Serial.begin(115200);
   // Serial.setDebugOutput(true);
   // while(!Serial);
   Serial.println("Touch Calibration");
 
 #ifdef GFX_EXTRA_PRE_INIT
   GFX_EXTRA_PRE_INIT();
 #endif
 
   Serial.println("Init display");
   gfx->begin();
   gfx->fillScreen(BLACK);
 
 #ifdef GFX_BL
   pinMode(GFX_BL, OUTPUT);
   digitalWrite(GFX_BL, HIGH);
 #endif
 
   // Init touch device
   w = gfx->width();
   h = gfx->height();
   touch_init(w, h, gfx->getRotation());
 
   // Top left
   point_x[0] = w / 8;
   point_y[0] = h / 8;
   // Top right
   point_x[1] = point_x[0] * 7;
   point_y[1] = point_y[0];
   // Bottom left
   point_x[2] = point_x[0];
   point_y[2] = point_y[0] * 7;
   // Bottom right
   point_x[3] = point_x[1];
   point_y[3] = point_y[2];
 
   gfx->setCursor(0, 0);
   gfx->setTextColor(RED);
   gfx->setTextSize(2);
   gfx->println("Touch Calibration");
 }
 
 void loop()
 {
   if (current_point != next_point)
   {
     current_point = next_point;
 
     gfx->drawLine(
         point_x[current_point] - 5,
         point_y[current_point] - 5,
         point_x[current_point] + 5,
         point_y[current_point] + 5,
         RED);
     gfx->drawLine(
         point_x[current_point] + 5,
         point_y[current_point] - 5,
         point_x[current_point] - 5,
         point_y[current_point] + 5,
         RED);
   }
 
   if (touch_touched())
   {
     int32_t total_x = touch_raw_x, total_y = touch_raw_y;
     int count = 1;
     while (touch_touched())
     {
       total_x += touch_raw_x;
       total_y += touch_raw_y;
       count++;
       // Serial.printf("touch_raw_x: %d, touch_raw_y: %d, count: %d\n", touch_raw_x, touch_raw_y, count);
     }
     touched_x[current_point] = total_x / count;
     touched_y[current_point] = total_y / count;
     // Serial.printf("touched_x: %d, touched_y: %d\n", touched_x[current_point], touched_y[current_point]);
 
     if (current_point == 3)
     {
       Serial.printf("touched_x[0]: %d, touched_y[0]: %d\n", touched_x[0], touched_y[0]);
       Serial.printf("touched_x[1]: %d, touched_y[1]: %d\n", touched_x[1], touched_y[1]);
       Serial.printf("touched_x[2]: %d, touched_y[2]: %d\n", touched_x[2], touched_y[2]);
       Serial.printf("touched_x[3]: %d, touched_y[3]: %d\n", touched_x[3], touched_y[3]);
       uint16_t delta_x = (touched_x[0] > touched_x[1]) ? (touched_x[0] - touched_x[1]) : (touched_x[1] - touched_x[0]);
       uint16_t delta_y = (touched_y[0] > touched_y[1]) ? (touched_y[0] - touched_y[1]) : (touched_y[1] - touched_y[0]);
 
       if (delta_x > delta_y)
       {
         touch_swap_xy = false;
         touch_map_x1 = (touched_x[0] + touched_x[2]) / 2;
         touch_map_x2 = (touched_x[1] + touched_x[3]) / 2;
         touch_map_y1 = (touched_y[0] + touched_y[1]) / 2;
         touch_map_y2 = (touched_y[2] + touched_y[3]) / 2;
       }
       else
       {
         touch_swap_xy = true;
         touch_map_x1 = (touched_y[0] + touched_y[2]) / 2;
         touch_map_x2 = (touched_y[1] + touched_y[3]) / 2;
         touch_map_y1 = (touched_x[0] + touched_x[1]) / 2;
         touch_map_y2 = (touched_x[2] + touched_x[3]) / 2;
       }
 
       if (touch_map_x1 > touch_map_x2)
       {
         delta_x = (touch_map_x1 - touch_map_x2) / 6;
         touch_map_x1 += delta_x;
         touch_map_x2 -= delta_x;
       }
       else
       {
         delta_x = (touch_map_x2 - touch_map_x1) / 6;
         touch_map_x1 -= delta_x;
         touch_map_x2 += delta_x;
       }
 
       if (touch_map_y1 > touch_map_y2)
       {
         delta_y = (touch_map_y1 - touch_map_y2) / 6;
         touch_map_y1 += delta_y;
         touch_map_y2 -= delta_y;
       }
       else
       {
         delta_y = (touch_map_y2 - touch_map_y1) / 6;
         touch_map_y1 -= delta_y;
         touch_map_y2 += delta_y;
       }
 
       Serial.printf("bool touch_swap_xy = %s;\n", touch_swap_xy ? "true" : "false");
       Serial.printf("int16_t touch_map_x1 = %d;\n", touch_map_x1);
       Serial.printf("int16_t touch_map_x2 = %d;\n", touch_map_x2);
       Serial.printf("int16_t touch_map_y1 = %d;\n", touch_map_y1);
       Serial.printf("int16_t touch_map_y2 = %d;\n", touch_map_y2);
 
       gfx->setCursor(0, point_y[0] + 10);
       gfx->setTextColor(WHITE);
       gfx->setTextSize(1);
       gfx->printf("bool touch_swap_xy = %s;\n", touch_swap_xy ? "true" : "false");
       gfx->printf("int16_t touch_map_x1 = %d;\n", touch_map_x1);
       gfx->printf("int16_t touch_map_x2 = %d;\n", touch_map_x2);
       gfx->printf("int16_t touch_map_y1 = %d;\n", touch_map_y1);
       gfx->printf("int16_t touch_map_y2 = %d;\n", touch_map_y2);
 
       // wait next touch to continue
       while (!touch_touched())
         ;
 
       gfx->fillScreen(BLACK);
       gfx->setCursor(0, 0);
       gfx->setTextColor(RED);
       gfx->setTextSize(2);
       gfx->println("Touch Calibration");
     }
 
     next_point = (current_point == 3) ? 0 : (current_point + 1);
   }
 
   delay(100);
 }

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