Problem with 2.8 inch Touch ILI9341 Display on MEGA

Other Hardware Displays
1

Hi,
this display works very well with Arduino UNO, but not with MEGA (no touch function).
Any ideas what's wrong?

Thanks, and best regards,

Matthias

Display type:
https://www.amazon.de/ILI9341-Display-Seriell-Arduino-Raspberry/dp/B07YTWRZGR

here the code:

 #include "SPI.h"
 #include "Adafruit_GFX.h"
 #include "Adafruit_ILI9341.h"
 #include <XPT2046_Touchscreen.h>
 #include <SdFat.h>                
 #include <Adafruit_ImageReader.h>
 #define IMAGE_PATH "/test.bmp"
 #define TFT_DC 47    // Uno PIN 9
 #define TFT_CS 53    // Uno PIN 10
 #define TFT_RST 46   // Uno PIN 8
 #define CS_PIN 42    // Uno PIN 7
 #define TIRQ_PIN 43  // Uno PIN 2
 #define SD_CS 27     // Uno PIN 4
 #define SCREEN_WIDTH 320
 #define SCREEN_HEIGHT 240
 #define TOUCH_MIN_X 330
 #define TOUCH_MAX_X 3800
 #define TOUCH_MIN_Y 231
 #define TOUCH_MAX_Y 3800
 #define BUTTON_WIDTH 120
 #define BUTTON_HEIGHT 50
 #define BUTTON_SPACING 20
 #define BUTTON_X1 ((SCREEN_WIDTH- (2 * BUTTON_WIDTH + BUTTON_SPACING)) / 2)
 #define BUTTON_X2 (BUTTON_X1 + BUTTON_WIDTH + BUTTON_SPACING)
 #define BUTTON_Y ((SCREEN_HEIGHT- BUTTON_HEIGHT) / 2)
 // Initialize tft display
 Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
 // Initialize touchscreen
 XPT2046_Touchscreen ts(CS_PIN, TIRQ_PIN);
 SdFat SD;    
// SD card filesystem
 Adafruit_ImageReader reader(SD); // Image-reader object, pass in SD filesys
 int32_t width = 0, // BMP image dimensions
 height = 0;
 ImageReturnCode stat;

 void drawButton(int x, const char* message) {
  tft.fillRoundRect(x, BUTTON_Y, BUTTON_WIDTH, BUTTON_HEIGHT, 5, ILI9341_RED);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  tft.setCursor(x + 15, BUTTON_Y + 15);
  tft.println(message);
 }

 void DisplayImage() {
  tft.fillScreen(ILI9341_WHITE);
  Serial.println(F("Loading image to screen..."));
  tft.setTextColor(ILI9341_RED);
  tft.setTextSize(2);
  tft.setCursor(10 , 5);
  tft.println(F("List of files on the SD.\n"));
  tft.println(SD.ls(&tft,LS_R));
  stat = reader.drawBMP(IMAGE_PATH, tft, 0, 50);
  reader.printStatus(stat);
  TS_Point touchPoint = ts.getPoint();
  while(touchPoint.x == ts.getPoint().x);
  loadMainScreen();
 }

 bool isTouched(int x, int y) {
  TS_Point touchPoint = ts.getPoint();
  delay(100);
  int mappedX = map(touchPoint.x, TOUCH_MIN_X, TOUCH_MAX_X, 0, SCREEN_WIDTH);
  int mappedY = map(touchPoint.y, TOUCH_MIN_Y, TOUCH_MAX_Y, 0, SCREEN_HEIGHT);
  return touchPoint.z >= 100 && mappedX >= x && mappedX <= x + BUTTON_WIDTH && mappedY >= BUTTON_Y && mappedY <= BUTTON_Y + BUTTON_HEIGHT;
 }
 void loadMainScreen() {
  tft.fillScreen(ILI9341_WHITE); // Set the background color to white
  drawButton(BUTTON_X1, "Display");
  drawButton(BUTTON_X2, "SD Card");
 }
 void testDisplay() {
  tft.setTextColor(ILI9341_RED);
  tft.setTextSize(2);
  tft.setCursor(BUTTON_X1 + 10 , BUTTON_Y + 80);
  tft.println("Hello World");
 }
 void setup() {
  Serial.begin(9600);
  tft.begin();
  tft.setRotation(3); // Set the screen rotation
  loadMainScreen();
 
  ts.begin();
  if(!SD.begin(SD_CS, SD_SCK_MHZ(25)))  {
    Serial.println(F("SD begin() failed"));
  }
 }

 void loop() {
  bool touchedButton1 = isTouched(BUTTON_X1, BUTTON_Y);
  bool touchedButton2 = isTouched(BUTTON_X2, BUTTON_Y);
  if (touchedButton1) {
    Serial.println("Button 1 was pressed.");
    testDisplay();
    delay(3000);
    loadMainScreen();
 
  } else if (touchedButton2) {
    DisplayImage();
    Serial.println("Button 2 was pressed.");
  }
 }
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