Function selectFileFromSD

src/modules/ble/BLE_Suite.cpp:2812–2935

//=============================================================================

String selectFileFromSD() {
    if (!SD.begin()) {
        showErrorMessage("SD Card not found");
        return "";
    }

    const int MAX_FILES = 30;
    String files[MAX_FILES];
    int fileCount = 0;

    File root = SD.open("/");
    if (!root) {
        showErrorMessage("Cannot open SD");
        return "";
    }

    File file = root.openNextFile();
    while (file && fileCount < MAX_FILES) {
        String filename = file.name();
        if (!file.isDirectory() && (filename.endsWith(".txt") || filename.endsWith(".ducky") ||
                                    filename.endsWith(".TXT") || filename.endsWith(".DUCKY"))) {
            files[fileCount++] = filename;
        }
        file = root.openNextFile();
    }
    root.close();

    if (fileCount == 0) {
        showErrorMessage("No files found");
        return "";
    }

    int selected = 0, scrollOffset = 0;
    int lastSelected = -1, lastScrollOffset = -1;
    bool exitMenu = false;
    int menuStartY = 60, menuItemHeight = 25;
    int maxVisibleItems = (tftHeight - menuStartY - 50) / menuItemHeight;
    if (maxVisibleItems > fileCount) maxVisibleItems = fileCount;

    while (!exitMenu) {
        if (selected != lastSelected || scrollOffset != lastScrollOffset) {
            tft.fillScreen(bruceConfig.bgColor);
            tft.drawRect(5, 5, tftWidth - 10, tftHeight - 10, TFT_WHITE);

            tft.setTextColor(TFT_WHITE, bruceConfig.bgColor);
            tft.setTextSize(2);
            tft.setCursor((tftWidth - strlen("SD CARD FILES") * 12) / 2, 15);
            tft.print("SD CARD FILES");
            tft.setTextSize(1);

            tft.setTextColor(TFT_YELLOW, bruceConfig.bgColor);
            tft.setCursor(20, 40);
            tft.print("Found: ");
            tft.print(fileCount);
            tft.print(" files");

            for (int i = 0; i < maxVisibleItems && (scrollOffset + i) < fileCount; i++) {
                int fileIdx = scrollOffset + i;