From e9d940a2ce423abb2ff6192422ac90fb831a1c16 Mon Sep 17 00:00:00 2001
From: Hamid Saffari <35362339+HamidSaffari@users.noreply.github.com>
Date: Fri, 27 Mar 2020 17:15:50 +0430
Subject: [PATCH] Create Touch_calibrate_Print_on_LCD.ino

---
 .../Touch_calibrate_Print_on_LCD.ino          | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 examples/Generic/Touch_calibrate_Print_on_LCD/Touch_calibrate_Print_on_LCD.ino

diff --git a/examples/Generic/Touch_calibrate_Print_on_LCD/Touch_calibrate_Print_on_LCD.ino b/examples/Generic/Touch_calibrate_Print_on_LCD/Touch_calibrate_Print_on_LCD.ino
new file mode 100644
index 0000000..94f93fd
--- /dev/null
+++ b/examples/Generic/Touch_calibrate_Print_on_LCD/Touch_calibrate_Print_on_LCD.ino
@@ -0,0 +1,102 @@
+/*
+  Sketch to generate the setup() calibration values, these are reported
+  to the Serial Monitor.
+
+  The sketch has been tested on the ESP8266 and screen with XPT2046 driver.
+*/
+
+#include <SPI.h>
+#include <TFT_eSPI.h>      // Hardware-specific library
+
+TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
+
+//------------------------------------------------------------------------------------------
+
+void setup() {
+  // Use serial port
+  //Serial.begin(115200);
+
+  // Initialise the TFT screen
+  tft.init();
+
+  // Set the rotation before we calibrate
+  tft.setRotation(1);
+
+  // Calibrate the touch screen and retrieve the scaling factors
+  touch_calibrate();
+
+/*
+  // Replace above line with the code sent to Serial Monitor
+  // once calibration is complete, e.g.:
+  uint16_t calData[5] = { 286, 3534, 283, 3600, 6 };
+  tft.setTouch(calData);
+*/
+
+  // Clear the screen
+  tft.setTextColor(TFT_YELLOW, TFT_BLACK);
+  tft.drawCentreString("Touch screen to test!",tft.width()/2, tft.height()/2, 2);
+  tft.setTextColor(TFT_WHITE, TFT_BLACK);
+}
+
+//------------------------------------------------------------------------------------------
+
+void loop(void) {
+  uint16_t x = 0, y = 0; // To store the touch coordinates
+
+  // Pressed will be set true is there is a valid touch on the screen
+  boolean pressed = tft.getTouch(&x, &y);
+
+  // Draw a white spot at the detected coordinates
+  if (pressed) {
+    tft.fillCircle(x, y, 2, TFT_WHITE);
+	tft.setCursor(20, 0);
+    tft.print("x,y = ");
+    tft.print(x);
+    tft.print(",");
+    tft.println(y);
+	tft.print("      ");
+  }
+}
+
+//------------------------------------------------------------------------------------------
+
+// Code to run a screen calibration, not needed when calibration values set in setup()
+void touch_calibrate()
+{
+  uint16_t calData[5];
+  uint8_t calDataOK = 0;
+
+  // Calibrate
+  tft.fillScreen(TFT_BLACK);
+  tft.setCursor(20, 0);
+  tft.setTextFont(2);
+  tft.setTextSize(1);
+  tft.setTextColor(TFT_GREEN, TFT_BLACK);
+
+  tft.println("Touch corners as indicated");
+
+  tft.setTextFont(1);
+  tft.println();
+
+  tft.calibrateTouch(calData, TFT_MAGENTA, TFT_BLACK, 15);
+  
+  tft.fillScreen(TFT_BLACK);
+	
+  tft.println(" //Use this calibration code in setup():");
+  tft.print(" uint16_t calData[5] = { ");
+
+  for (uint8_t i = 0; i < 5; i++)
+  {
+	tft.print(calData[i]);
+    if (i < 4){
+		tft.print(", ");
+	}
+	
+  }
+
+  tft.println(" };");
+  tft.print(" tft.setTouch(calData);");
+  
+  delay(4000);
+}
+