105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
/*
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Sketch to generate the setup() calibration values, these are reported
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to the Serial Monitor.
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The sketch has been tested on the ESP8266 and screen with XPT2046 driver.
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*/
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#include <SPI.h>
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#include <TFT_eSPI.h> // Hardware-specific library
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TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
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//------------------------------------------------------------------------------------------
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void setup() {
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// Use serial port
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Serial.begin(115200);
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// Initialise the TFT screen
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tft.init();
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// Set the rotation to the orientation you wish to use in your project before calibration
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// (the touch coordinates returned then correspond to that rotation only)
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tft.setRotation(1);
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// Calibrate the touch screen and retrieve the scaling factors
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touch_calibrate();
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/*
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// Replace above line with the code sent to Serial Monitor
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// once calibration is complete, e.g.:
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uint16_t calData[5] = { 286, 3534, 283, 3600, 6 };
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tft.setTouch(calData);
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*/
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// Clear the screen
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tft.fillScreen(TFT_BLACK);
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tft.drawCentreString("Touch screen to test!",tft.width()/2, tft.height()/2, 2);
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}
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//------------------------------------------------------------------------------------------
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void loop(void) {
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uint16_t x = 0, y = 0; // To store the touch coordinates
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// Pressed will be set true is there is a valid touch on the screen
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bool pressed = tft.getTouch(&x, &y);
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// Draw a white spot at the detected coordinates
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if (pressed) {
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tft.fillCircle(x, y, 2, TFT_WHITE);
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//Serial.print("x,y = ");
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//Serial.print(x);
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//Serial.print(",");
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//Serial.println(y);
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}
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}
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//------------------------------------------------------------------------------------------
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// Code to run a screen calibration, not needed when calibration values set in setup()
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void touch_calibrate()
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{
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uint16_t calData[5];
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uint8_t calDataOK = 0;
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// Calibrate
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tft.fillScreen(TFT_BLACK);
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tft.setCursor(20, 0);
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tft.setTextFont(2);
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tft.setTextSize(1);
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tft.setTextColor(TFT_WHITE, TFT_BLACK);
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tft.println("Touch corners as indicated");
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tft.setTextFont(1);
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tft.println();
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tft.calibrateTouch(calData, TFT_MAGENTA, TFT_BLACK, 15);
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Serial.println(); Serial.println();
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Serial.println("// Use this calibration code in setup():");
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Serial.print(" uint16_t calData[5] = ");
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Serial.print("{ ");
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for (uint8_t i = 0; i < 5; i++)
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{
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Serial.print(calData[i]);
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if (i < 4) Serial.print(", ");
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}
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Serial.println(" };");
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Serial.print(" tft.setTouch(calData);");
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Serial.println(); Serial.println();
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tft.fillScreen(TFT_BLACK);
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tft.setTextColor(TFT_GREEN, TFT_BLACK);
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tft.println("Calibration complete!");
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tft.println("Calibration code sent to Serial port.");
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delay(4000);
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}
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