SD Library function doesnt work while using second SPI port with ESP32

Question

i work on a group project with an ESP32. We have a lcd display and a sd card connected via the two SPI ports of the ESP32.

The card gets initialized with no problem using this code:

 bool EKG_recording::initialisation_sd() {
 SPIClass * hspi = new SPIClass(HSPI);
 if (!SD.begin(CS_Pin, *hspi))
 {
 Serial.println("No valid SD card!");
 return 0;
 }
 else if (SD.begin(CS_Pin, *hspi))
 {
 Serial.println("SD card initialized!");
 return 1;
 }
 else return 0;
}

One function i have a problem with is used to count every file on the SD card, simple enough right?

unsigned short EKG_recording::count_files_from_SD(File dir) {
 while (true)
 {
 File entry = dir.openNextFile();
 if (!entry)
 {
 // Serial.println("Anzahl der Daten");
 return counter;
 }
 counter++;
 entry.close();
 }
}

It once worked without a problem, then we integrated the two SPI ports and now i cant figure out why its not working. This part: File entry = dir.openNextFile(); returns false on the first call even though i am 100% sure there are 3 files on the SD card.

I call the function like this :

File root = SD.open("/"); EKG_recording_1.count_files_from_SD(root);

But why? Any help is very appreciated.

This is the begin function of the display. Since i didnt write it, i know next to nothing about it.

 void EKG_display_control::begin()
{
 // Backgroundlight off
 pinMode(TFT_LED, OUTPUT);
 disable_display_backlight();
 // Initialise Display
 tft.begin(40000000);
 touch.begin();
 tft.setRotation(ROTATION);
 layout_start_screen();
}

THE PINOUT:

The MC+SD Adapter

• Xenoshell: i use a sd adapter, connected via wires to the pins of the ESP32, also added the pinout
• Xenoshell: Its just a SD adapter you can also plug into a PC or Laptop. I soldered some pins to it and connected those with the pins of the ESP32
• Xenoshell: I also edited the begin function of the display into the main post
• Juraj: ok. how is SPI for the display initialized? I guess it uses the default SPI object. so everything looks ok.
• Xenoshell: I asked my team member and she said the display uses the default SPI

Answer 1

Ok i found the solution. It was not too complicated. I just assumed the problem was in the code. This works well enough (dont ask me about the counter--)

 unsigned short EKG_recording::count_files_from_SD() {
 root = SD.open("/");
 root.rewindDirectory(); //Sets to beginning of directory
 while (true)
 {
 File entry = root.openNextFile();
 if(!entry){
 Serial.println("Anzahl der Daten");
 counter--;
 return counter;
 }
 counter++;
 entry.close();
 }
}

It was just because i used SD.open() always inside the class-functions, so every file root was bound to the class.