Merge 5ae10a7eb6 into e5c0ddc9fa

## Summary

* **What is the goal of this PR?**
Add a debugging script to help developers monitor the ESP32 serial port
directly from a PC.

* **What changes are included?**
Added a new script: scripts/debugging_monitor.py

## Additional Context

While working on a new Crosspoint-Reader feature, it quickly became
clear that watching the ESP32 serial output without any visual cues was
inconvenient and easy to mess up.

This script improves the debugging experience by reading data from the
serial port and providing:

1. A timestamp prefix for every log line (instead of milliseconds since
power-up)
2. Color-coded output for different message types
3. A secondary window displaying a live graph of RAM usage, which is
especially useful for tracking the memory impact of new features

<img width="1916" height="1049" alt="Screenshot_20260126_183811"
src="https://github.com/user-attachments/assets/6291887f-ac17-43ac-9e43-f5dec8a7097e"
/>

---

### AI Usage

Did you use AI tools to help write this code? _**< PARTIALLY >**_
I wrote the initial version of the script. Gemini was used to help add
the Matplotlib-based graphing and threading logic.

README.md

@@ -95,6 +95,20 @@ Connect your Xteink X4 to your computer via USB-C and run the following command.
 ```sh
 pio run --target upload
 ```
+### Debugging
+
+After flashing the new features, it’s recommended to capture detailed logs from the serial port.
+
+First, make sure all required Python packages are installed:
+
+```python
+python3 -m pip install serial colorama matplotlib
+```
+after that run the script:
+```sh
+python3 scripts/debugging_monitor.py
+```
+This was tested on Debian and should work on most Linux systems. Minor adjustments may be required for Windows or macOS.
 
 ## Internals
 

lib/GfxRenderer/GfxRenderer.cpp

@@ -415,13 +415,21 @@ void GfxRenderer::displayBuffer(const HalDisplay::RefreshMode refreshMode) const
 
 std::string GfxRenderer::truncatedText(const int fontId, const char* text, const int maxWidth,
                                        const EpdFontFamily::Style style) const {
+  if (!text || maxWidth <= 0) return "";
+
   std::string item = text;
-  int itemWidth = getTextWidth(fontId, item.c_str(), style);
-  while (itemWidth > maxWidth && item.length() > 8) {
-    item.replace(item.length() - 5, 5, "...");
-    itemWidth = getTextWidth(fontId, item.c_str(), style);
-  }
+  const char* ellipsis = "...";
+  int textWidth = getTextWidth(fontId, item.c_str(), style);
+  if (textWidth <= maxWidth) {
+    // Text fits, return as is
     return item;
+  }
+
+  while (!item.empty() && getTextWidth(fontId, (item + ellipsis).c_str(), style) >= maxWidth) {
+    utf8RemoveLastChar(item);
+  }
+
+  return item.empty() ? ellipsis : item + ellipsis;
 }
 
 // Note: Internal driver treats screen in command orientation; this library exposes a logical orientation

lib/Serialization/Serialization.h

@@ -49,4 +49,12 @@ static void readString(FsFile& file, std::string& s) {
   s.resize(len);
   file.read(&s[0], len);
 }
+
+static void readString(FsFile& file, char* buffer, size_t maxLen) {
+  uint32_t len;
+  readPod(file, len);
+  const uint32_t bytesToRead = (len < maxLen - 1) ? len : (maxLen - 1);
+  file.read(reinterpret_cast<uint8_t*>(buffer), bytesToRead);
+  buffer[bytesToRead] = '\0';
+}
 }  // namespace serialization

lib/Utf8/Utf8.cpp

@@ -29,3 +29,20 @@ uint32_t utf8NextCodepoint(const unsigned char** string) {
 
   return cp;
 }
+
+size_t utf8RemoveLastChar(std::string& str) {
+  if (str.empty()) return 0;
+  size_t pos = str.size() - 1;
+  while (pos > 0 && (static_cast<unsigned char>(str[pos]) & 0xC0) == 0x80) {
+    --pos;
+  }
+  str.resize(pos);
+  return pos;
+}
+
+// Truncate string by removing N UTF-8 characters from the end
+void utf8TruncateChars(std::string& str, const size_t numChars) {
+  for (size_t i = 0; i < numChars && !str.empty(); ++i) {
+    utf8RemoveLastChar(str);
+  }
+}

lib/Utf8/Utf8.h

@@ -1,7 +1,11 @@
 #pragma once
 
 #include <cstdint>
-
+#include <string>
 #define REPLACEMENT_GLYPH 0xFFFD
 
 uint32_t utf8NextCodepoint(const unsigned char** string);
+// Remove the last UTF-8 codepoint from a std::string and return the new size.
+size_t utf8RemoveLastChar(std::string& str);
+// Truncate string by removing N UTF-8 codepoints from the end.
+void utf8TruncateChars(std::string& str, size_t numChars);

scripts/debugging_monitor.py

@@ -0,0 +1,214 @@
+import sys
+import argparse
+import re
+import threading
+from datetime import datetime
+from collections import deque
+import time
+
+# Try to import potentially missing packages
+try:
+    import serial
+    from colorama import init, Fore, Style
+    import matplotlib.pyplot as plt
+    import matplotlib.animation as animation
+except ImportError as e:
+    missing_package = e.name
+    print("\n" + "!" * 50)
+    print(f" Error: The required package '{missing_package}' is not installed.")
+    print("!" * 50)
+
+    print(f"\nTo fix this, please run the following command in your terminal:\n")
+
+    install_cmd = "pip install "
+    packages = []
+    if 'serial' in str(e): packages.append("pyserial")
+    if 'colorama' in str(e): packages.append("colorama")
+    if 'matplotlib' in str(e): packages.append("matplotlib")
+
+    print(f"    {install_cmd}{' '.join(packages)}")
+
+    print("\nExiting...")
+    sys.exit(1)
+
+# --- Global Variables for Data Sharing ---
+# Store last 50 data points
+MAX_POINTS = 50
+time_data = deque(maxlen=MAX_POINTS)
+free_mem_data = deque(maxlen=MAX_POINTS)
+total_mem_data = deque(maxlen=MAX_POINTS)
+data_lock = threading.Lock() # Prevent reading while writing
+
+# Initialize colors
+init(autoreset=True)
+
+def get_color_for_line(line):
+    """
+    Classify log lines by type and assign appropriate colors.
+    """
+    line_upper = line.upper()
+
+    if any(keyword in line_upper for keyword in ["ERROR", "[ERR]", "[SCT]", "FAILED", "WARNING"]):
+        return Fore.RED
+    if "[MEM]" in line_upper or "FREE:" in line_upper:
+        return Fore.CYAN
+    if any(keyword in line_upper for keyword in ["[GFX]", "[ERS]", "DISPLAY", "RAM WRITE", "RAM COMPLETE", "REFRESH", "POWERING ON", "FRAME BUFFER", "LUT"]):
+        return Fore.MAGENTA
+    if any(keyword in line_upper for keyword in ["[EBP]", "[BMC]", "[ZIP]", "[PARSER]", "[EHP]", "LOADING EPUB", "CACHE", "DECOMPRESSED", "PARSING"]):
+        return Fore.GREEN
+    if "[ACT]" in line_upper or "ENTERING ACTIVITY" in line_upper or "EXITING ACTIVITY" in line_upper:
+        return Fore.YELLOW
+    if any(keyword in line_upper for keyword in ["RENDERED PAGE", "[LOOP]", "DURATION", "WAIT COMPLETE"]):
+        return Fore.BLUE
+    if any(keyword in line_upper for keyword in ["[CPS]", "SETTINGS", "[CLEAR_CACHE]"]):
+        return Fore.LIGHTYELLOW_EX
+    if any(keyword in line_upper for keyword in ["ESP-ROM", "BUILD:", "RST:", "BOOT:", "SPIWP:", "MODE:", "LOAD:", "ENTRY", "[SD]", "STARTING CROSSPOINT", "VERSION"]):
+        return Fore.LIGHTBLACK_EX
+    if "[RBS]" in line_upper:
+        return Fore.LIGHTCYAN_EX
+    if "[KRS]" in line_upper:
+        return Fore.LIGHTMAGENTA_EX
+    if any(keyword in line_upper for keyword in ["EINKDISPLAY:", "STATIC FRAME", "INITIALIZING", "SPI INITIALIZED", "GPIO PINS", "RESETTING", "SSD1677", "E-INK"]):
+        return Fore.LIGHTMAGENTA_EX
+    if any(keyword in line_upper for keyword in ["[FNS]", "FOOTNOTE"]):
+        return Fore.LIGHTGREEN_EX
+    if any(keyword in line_upper for keyword in ["[CHAP]", "[OPDS]", "[COF]"]):
+        return Fore.LIGHTYELLOW_EX
+
+    return Fore.WHITE
+
+def parse_memory_line(line):
+    """
+    Extracts Free and Total bytes from the specific log line.
+    Format: [MEM] Free: 196344 bytes, Total: 226412 bytes, Min Free: 112620 bytes
+    """
+    # Regex to find 'Free: <digits>' and 'Total: <digits>'
+    match = re.search(r"Free:\s*(\d+).*Total:\s*(\d+)", line)
+    if match:
+        try:
+            free_bytes = int(match.group(1))
+            total_bytes = int(match.group(2))
+            return free_bytes, total_bytes
+        except ValueError:
+            return None, None
+    return None, None
+
+def serial_worker(port, baud):
+    """
+    Runs in a background thread. Handles reading serial, printing to console,
+    and updating the data lists.
+    """
+    print(f"{Fore.CYAN}--- Opening {port} at {baud} baud ---{Style.RESET_ALL}")
+
+    try:
+        ser = serial.Serial(port, baud, timeout=0.1)
+        ser.dtr = False
+        ser.rts = False
+    except serial.SerialException as e:
+        print(f"{Fore.RED}Error opening port: {e}{Style.RESET_ALL}")
+        return
+
+    try:
+        while True:
+            try:
+                raw_data = ser.readline().decode('utf-8', errors='replace')
+
+                if not raw_data:
+                    continue
+
+                clean_line = raw_data.strip()
+                if not clean_line:
+                    continue
+
+                # Add PC timestamp
+                pc_time = datetime.now().strftime("%H:%M:%S")
+                formatted_line = re.sub(r"^\[\d+\]", f"[{pc_time}]", clean_line)
+
+                # Check for Memory Line
+                if "[MEM]" in formatted_line:
+                    free_val, total_val = parse_memory_line(formatted_line)
+                    if free_val is not None:
+                        with data_lock:
+                            time_data.append(pc_time)
+                            free_mem_data.append(free_val / 1024) # Convert to KB
+                            total_mem_data.append(total_val / 1024) # Convert to KB
+
+                # Print to console
+                line_color = get_color_for_line(formatted_line)
+                print(f"{line_color}{formatted_line}")
+
+            except OSError:
+                print(f"{Fore.RED}Device disconnected.{Style.RESET_ALL}")
+                break
+    except Exception as e:
+        # If thread is killed violently (e.g. main exit), silence errors
+        pass
+    finally:
+        if 'ser' in locals() and ser.is_open:
+            ser.close()
+
+def update_graph(frame):
+    """
+    Called by Matplotlib animation to redraw the chart.
+    """
+    with data_lock:
+        if not time_data:
+            return
+
+        # Convert deques to lists for plotting
+        x = list(time_data)
+        y_free = list(free_mem_data)
+        y_total = list(total_mem_data)
+
+    plt.cla() # Clear axis
+
+    # Plot Total RAM
+    plt.plot(x, y_total, label='Total RAM (KB)', color='red', linestyle='--')
+
+    # Plot Free RAM
+    plt.plot(x, y_free, label='Free RAM (KB)', color='green', marker='o')
+
+    # Fill area under Free RAM
+    plt.fill_between(x, y_free, color='green', alpha=0.1)
+
+    plt.title("ESP32 Memory Monitor")
+    plt.ylabel("Memory (KB)")
+    plt.xlabel("Time")
+    plt.legend(loc='upper left')
+    plt.grid(True, linestyle=':', alpha=0.6)
+
+    # Rotate date labels
+    plt.xticks(rotation=45, ha='right')
+    plt.tight_layout()
+
+def main():
+    parser = argparse.ArgumentParser(description="ESP32 Monitor with Graph")
+    parser.add_argument("port", nargs="?", default="/dev/ttyACM0", help="Serial port")
+    parser.add_argument("--baud", type=int, default=115200, help="Baud rate")
+    args = parser.parse_args()
+
+    # 1. Start the Serial Reader in a separate thread
+    # Daemon=True means this thread dies when the main program closes
+    t = threading.Thread(target=serial_worker, args=(args.port, args.baud), daemon=True)
+    t.start()
+
+    # 2. Set up the Graph (Main Thread)
+    try:
+        plt.style.use('light_background')
+    except:
+        pass
+
+    fig = plt.figure(figsize=(10, 6))
+
+    # Update graph every 1000ms
+    ani = animation.FuncAnimation(fig, update_graph, interval=1000)
+
+    try:
+        print(f"{Fore.YELLOW}Starting Graph Window... (Close window to exit){Style.RESET_ALL}")
+        plt.show()
+    except KeyboardInterrupt:
+        print(f"\n{Fore.YELLOW}Exiting...{Style.RESET_ALL}")
+        plt.close('all') # Force close any lingering plot windows
+
+if __name__ == "__main__":
+    main()

src/CrossPointSettings.cpp

@@ -11,21 +11,132 @@
 // Initialize the static instance
 CrossPointSettings CrossPointSettings::instance;
 
-void readAndValidate(FsFile& file, uint8_t& member, const uint8_t maxValue) {
-  uint8_t tempValue;
-  serialization::readPod(file, tempValue);
-  if (tempValue < maxValue) {
-    member = tempValue;
+// SettingDescriptor implementations
+bool SettingDescriptor::validate(const CrossPointSettings& settings) const {
+  if (type == SettingType::STRING) {
+    return true;  // Strings are always valid
   }
+  if (!validator) {
+    return true;  // No validator means always valid
+  }
+  const uint8_t value = settings.*(memberPtr);
+  return validator(value);
+}
+
+uint8_t SettingDescriptor::getValue(const CrossPointSettings& settings) const { return settings.*(memberPtr); }
+
+void SettingDescriptor::setValue(CrossPointSettings& settings, uint8_t value) const { settings.*(memberPtr) = value; }
+
+void SettingDescriptor::resetToDefault(CrossPointSettings& settings) const {
+  if (type == SettingType::STRING) {
+    strncpy(stringPtr, stringData.defaultString, stringData.maxSize - 1);
+    stringPtr[stringData.maxSize - 1] = '\0';
+    return;
+  }
+  setValue(settings, defaultValue);
+}
+
+void SettingDescriptor::save(FsFile& file, const CrossPointSettings& settings) const {
+  if (type == SettingType::STRING) {
+    serialization::writeString(file, std::string(stringPtr));
+    return;
+  }
+  serialization::writePod(file, settings.*(memberPtr));
+}
+
+void SettingDescriptor::load(FsFile& file, CrossPointSettings& settings) const {
+  if (type == SettingType::STRING) {
+    serialization::readString(file, stringPtr, stringData.maxSize);
+    return;
+  }
+  uint8_t value;
+  serialization::readPod(file, value);
+  settings.*(memberPtr) = value;
 }
 
 namespace {
 constexpr uint8_t SETTINGS_FILE_VERSION = 1;
-// Increment this when adding new persisted settings fields
-constexpr uint8_t SETTINGS_COUNT = 23;
 constexpr char SETTINGS_FILE[] = "/.crosspoint/settings.bin";
 }  // namespace
 
+// Define enum value arrays
+namespace {
+constexpr const char* sleepScreenValues[] = {"Dark", "Light", "Custom", "Cover", "None"};
+constexpr const char* shortPwrBtnValues[] = {"Ignore", "Sleep", "Page Turn"};
+constexpr const char* statusBarValues[] = {"None", "No Progress", "Full"};
+constexpr const char* orientationValues[] = {"Portrait", "Landscape CW", "Inverted", "Landscape CCW"};
+constexpr const char* frontButtonLayoutValues[] = {"Bck, Cnfrm, Lft, Rght", "Lft, Rght, Bck, Cnfrm",
+                                                   "Lft, Bck, Cnfrm, Rght", "Bck, Cnfrm, Rght, Lft"};
+constexpr const char* sideButtonLayoutValues[] = {"Prev/Next", "Next/Prev"};
+constexpr const char* fontFamilyValues[] = {"Bookerly", "Noto Sans", "Open Dyslexic"};
+constexpr const char* fontSizeValues[] = {"Small", "Medium", "Large", "X Large"};
+constexpr const char* lineSpacingValues[] = {"Tight", "Normal", "Wide"};
+constexpr const char* paragraphAlignmentValues[] = {"Justify", "Left", "Center", "Right"};
+constexpr const char* sleepTimeoutValues[] = {"1 min", "5 min", "10 min", "15 min", "30 min"};
+constexpr const char* refreshFrequencyValues[] = {"1 page", "5 pages", "10 pages", "15 pages", "30 pages"};
+constexpr const char* sleepScreenCoverModeValues[] = {"Fit", "Crop"};
+constexpr const char* hideBatteryPercentageValues[] = {"Never", "In Reader", "Always"};
+constexpr const char* sleepScreenCoverFilterValues[] = {"None", "Contrast", "Inverted"};
+
+// Helper function template to deduce array size automatically
+template <size_t N>
+constexpr SettingDescriptor makeEnumDescriptor(const char* name, uint8_t CrossPointSettings::* ptr,
+                                               uint8_t defaultValue, const char* const (&enumValues)[N]) {
+  return SettingDescriptor(name, SettingType::ENUM, ptr, defaultValue, validateEnum<N>, enumValues, N);
+}
+
+// Helper macro to create STRING descriptors without repetition
+#define makeStringDescriptor(name, member, defStr)                                          \
+  SettingDescriptor(name, SettingType::STRING, CrossPointSettings::instance.member, defStr, \
+                    sizeof(CrossPointSettings::member))
+}  // namespace
+
+// Define static constexpr members (required in C++14 and earlier)
+constexpr size_t CrossPointSettings::DESCRIPTOR_COUNT;
+
+// Define the static constexpr array of all setting descriptors
+// Order must match current serialization order for file format compatibility!
+const std::array<SettingDescriptor, CrossPointSettings::DESCRIPTOR_COUNT> CrossPointSettings::descriptors = {{
+    makeEnumDescriptor("Sleep Screen", &CrossPointSettings::sleepScreen, CrossPointSettings::DARK, sleepScreenValues),
+    {"Extra Paragraph Spacing", SettingType::TOGGLE, &CrossPointSettings::extraParagraphSpacing, 1, validateToggle,
+     nullptr, 0},
+    makeEnumDescriptor("Short Power Button Click", &CrossPointSettings::shortPwrBtn, CrossPointSettings::IGNORE,
+                       shortPwrBtnValues),
+    makeEnumDescriptor("Status Bar", &CrossPointSettings::statusBar, CrossPointSettings::FULL, statusBarValues),
+    makeEnumDescriptor("Reading Orientation", &CrossPointSettings::orientation, CrossPointSettings::PORTRAIT,
+                       orientationValues),
+    makeEnumDescriptor("Front Button Layout", &CrossPointSettings::frontButtonLayout,
+                       CrossPointSettings::BACK_CONFIRM_LEFT_RIGHT, frontButtonLayoutValues),
+    makeEnumDescriptor("Side Button Layout", &CrossPointSettings::sideButtonLayout, CrossPointSettings::PREV_NEXT,
+                       sideButtonLayoutValues),
+    makeEnumDescriptor("Reader Font Family", &CrossPointSettings::fontFamily, CrossPointSettings::BOOKERLY,
+                       fontFamilyValues),
+    makeEnumDescriptor("Reader Font Size", &CrossPointSettings::fontSize, CrossPointSettings::MEDIUM, fontSizeValues),
+    makeEnumDescriptor("Reader Line Spacing", &CrossPointSettings::lineSpacing, CrossPointSettings::NORMAL,
+                       lineSpacingValues),
+    makeEnumDescriptor("Reader Paragraph Alignment", &CrossPointSettings::paragraphAlignment,
+                       CrossPointSettings::JUSTIFIED, paragraphAlignmentValues),
+    makeEnumDescriptor("Time to Sleep", &CrossPointSettings::sleepTimeout, CrossPointSettings::SLEEP_10_MIN,
+                       sleepTimeoutValues),
+    makeEnumDescriptor("Refresh Frequency", &CrossPointSettings::refreshFrequency, CrossPointSettings::REFRESH_15,
+                       refreshFrequencyValues),
+    {"Reader Screen Margin", SettingType::VALUE, &CrossPointSettings::screenMargin, 5, validateRange<5, 40>,
+     ValueRange{5, 40, 5}},
+    makeEnumDescriptor("Sleep Screen Cover Mode", &CrossPointSettings::sleepScreenCoverMode, CrossPointSettings::FIT,
+                       sleepScreenCoverModeValues),
+    makeStringDescriptor("OPDS Server URL", opdsServerUrl, ""),
+    {"Text Anti-Aliasing", SettingType::TOGGLE, &CrossPointSettings::textAntiAliasing, 1, validateToggle, nullptr, 0},
+    makeEnumDescriptor("Hide Battery %", &CrossPointSettings::hideBatteryPercentage, CrossPointSettings::HIDE_NEVER,
+                       hideBatteryPercentageValues),
+    {"Long-press Chapter Skip", SettingType::TOGGLE, &CrossPointSettings::longPressChapterSkip, 1, validateToggle,
+     nullptr, 0},
+    {"Hyphenation", SettingType::TOGGLE, &CrossPointSettings::hyphenationEnabled, 0, validateToggle, nullptr, 0},
+    makeStringDescriptor("Username", opdsUsername, ""),
+    makeStringDescriptor("Password", opdsPassword, ""),
+    makeEnumDescriptor("Sleep Screen Cover Filter", &CrossPointSettings::sleepScreenCoverFilter,
+                       CrossPointSettings::NO_FILTER, sleepScreenCoverFilterValues),
+}};
+
 bool CrossPointSettings::saveToFile() const {
   // Make sure the directory exists
   SdMan.mkdir("/.crosspoint");
@@ -36,31 +147,15 @@ bool CrossPointSettings::saveToFile() const {
   }
 
   serialization::writePod(outputFile, SETTINGS_FILE_VERSION);
-  serialization::writePod(outputFile, SETTINGS_COUNT);
-  serialization::writePod(outputFile, sleepScreen);
-  serialization::writePod(outputFile, extraParagraphSpacing);
-  serialization::writePod(outputFile, shortPwrBtn);
-  serialization::writePod(outputFile, statusBar);
-  serialization::writePod(outputFile, orientation);
-  serialization::writePod(outputFile, frontButtonLayout);
-  serialization::writePod(outputFile, sideButtonLayout);
-  serialization::writePod(outputFile, fontFamily);
-  serialization::writePod(outputFile, fontSize);
-  serialization::writePod(outputFile, lineSpacing);
-  serialization::writePod(outputFile, paragraphAlignment);
-  serialization::writePod(outputFile, sleepTimeout);
-  serialization::writePod(outputFile, refreshFrequency);
-  serialization::writePod(outputFile, screenMargin);
-  serialization::writePod(outputFile, sleepScreenCoverMode);
-  serialization::writeString(outputFile, std::string(opdsServerUrl));
-  serialization::writePod(outputFile, textAntiAliasing);
-  serialization::writePod(outputFile, hideBatteryPercentage);
-  serialization::writePod(outputFile, longPressChapterSkip);
-  serialization::writePod(outputFile, hyphenationEnabled);
-  serialization::writeString(outputFile, std::string(opdsUsername));
-  serialization::writeString(outputFile, std::string(opdsPassword));
-  serialization::writePod(outputFile, sleepScreenCoverFilter);
-  // New fields added at end for backward compatibility
+  serialization::writePod(outputFile, static_cast<uint8_t>(CrossPointSettings::DESCRIPTOR_COUNT));
+
+  // Use descriptors to automatically serialize all uint8_t settings
+  uint8_t descriptorIndex = 0;
+  for (const auto& desc : descriptors) {
+    desc.save(outputFile, *this);
+    descriptorIndex++;
+  }
+
   outputFile.close();
 
   Serial.printf("[%lu] [CPS] Settings saved to file\n", millis());
@@ -68,8 +163,10 @@ bool CrossPointSettings::saveToFile() const {
 }
 
 bool CrossPointSettings::loadFromFile() {
+  Serial.printf("[%lu] [CPS] Loading settings from file\n", millis());
   FsFile inputFile;
   if (!SdMan.openFileForRead("CPS", SETTINGS_FILE, inputFile)) {
+    Serial.printf("[%lu] [CPS] Deserialization failed: Could not open settings file\n", millis());
     return false;
   }
 
@@ -84,74 +181,26 @@ bool CrossPointSettings::loadFromFile() {
   uint8_t fileSettingsCount = 0;
   serialization::readPod(inputFile, fileSettingsCount);
 
-  // load settings that exist (support older files with fewer fields)
-  uint8_t settingsRead = 0;
-  do {
-    readAndValidate(inputFile, sleepScreen, SLEEP_SCREEN_MODE_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    serialization::readPod(inputFile, extraParagraphSpacing);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, shortPwrBtn, SHORT_PWRBTN_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, statusBar, STATUS_BAR_MODE_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, orientation, ORIENTATION_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, frontButtonLayout, FRONT_BUTTON_LAYOUT_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, sideButtonLayout, SIDE_BUTTON_LAYOUT_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, fontFamily, FONT_FAMILY_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, fontSize, FONT_SIZE_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, lineSpacing, LINE_COMPRESSION_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, paragraphAlignment, PARAGRAPH_ALIGNMENT_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, sleepTimeout, SLEEP_TIMEOUT_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, refreshFrequency, REFRESH_FREQUENCY_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    serialization::readPod(inputFile, screenMargin);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, sleepScreenCoverMode, SLEEP_SCREEN_COVER_MODE_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    {
-      std::string urlStr;
-      serialization::readString(inputFile, urlStr);
-      strncpy(opdsServerUrl, urlStr.c_str(), sizeof(opdsServerUrl) - 1);
-      opdsServerUrl[sizeof(opdsServerUrl) - 1] = '\0';
-    }
-    if (++settingsRead >= fileSettingsCount) break;
-    serialization::readPod(inputFile, textAntiAliasing);
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, hideBatteryPercentage, HIDE_BATTERY_PERCENTAGE_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    serialization::readPod(inputFile, longPressChapterSkip);
-    if (++settingsRead >= fileSettingsCount) break;
-    serialization::readPod(inputFile, hyphenationEnabled);
-    if (++settingsRead >= fileSettingsCount) break;
-    {
-      std::string usernameStr;
-      serialization::readString(inputFile, usernameStr);
-      strncpy(opdsUsername, usernameStr.c_str(), sizeof(opdsUsername) - 1);
-      opdsUsername[sizeof(opdsUsername) - 1] = '\0';
-    }
-    if (++settingsRead >= fileSettingsCount) break;
-    {
-      std::string passwordStr;
-      serialization::readString(inputFile, passwordStr);
-      strncpy(opdsPassword, passwordStr.c_str(), sizeof(opdsPassword) - 1);
-      opdsPassword[sizeof(opdsPassword) - 1] = '\0';
-    }
-    if (++settingsRead >= fileSettingsCount) break;
-    readAndValidate(inputFile, sleepScreenCoverFilter, SLEEP_SCREEN_COVER_FILTER_COUNT);
-    if (++settingsRead >= fileSettingsCount) break;
-    // New fields added at end for backward compatibility
-  } while (false);
+  // Use descriptors to automatically deserialize all uint8_t settings
+  uint8_t descriptorIndex = 0;
+  uint8_t filePosition = 0;
 
+  for (const auto& desc : descriptors) {
+    if (filePosition >= fileSettingsCount) {
+      break;  // File has fewer settings than current version
+    }
+
+    desc.load(inputFile, *this);
+    if (!desc.validate(*this)) {
+      Serial.printf("[%lu] [CPS] Invalid value (0x%X) for %s, resetting to default\n", millis(), desc.getValue(*this),
+                    desc.name);
+      desc.resetToDefault(*this);
+    }
+    descriptorIndex++;
+    filePosition++;
+  }
   inputFile.close();
+
   Serial.printf("[%lu] [CPS] Settings loaded from file\n", millis());
   return true;
 }

src/CrossPointSettings.h

@@ -1,6 +1,112 @@
 #pragma once
+#include <array>
 #include <cstdint>
 #include <iosfwd>
+#include <string>
+#include <vector>
+
+// Setting descriptor infrastructure
+enum class SettingType { TOGGLE, ENUM, VALUE, STRING };
+
+// Validator function pointer (not std::function to save memory)
+using SettingValidator = bool (*)(uint8_t);
+
+// Forward declare for descriptors
+class CrossPointSettings;
+
+// Forward declare file type
+class FsFile;
+
+// Base descriptor for all settings (non-virtual for constexpr)
+struct SettingDescriptorBase {
+  const char* name;  // Display name
+  SettingType type;
+};
+
+// Value range for VALUE type settings
+struct ValueRange {
+  uint8_t min, max, step;
+};
+
+// Concrete descriptor for uint8_t settings (constexpr-compatible)
+struct SettingDescriptor : public SettingDescriptorBase {
+  union {
+    uint8_t CrossPointSettings::* memberPtr;  // For TOGGLE/ENUM/VALUE types
+    char* stringPtr;                          // For STRING type
+  };
+  uint8_t defaultValue;
+  SettingValidator validator;  // Optional validator function
+
+  union {
+    // For ENUM types
+    struct {
+      const char* const* values;
+      uint8_t count;
+    } enumData;
+
+    // For VALUE types
+    ValueRange valueRange;
+
+    // For STRING types
+    struct {
+      const char* defaultString;  // Default string value
+      size_t maxSize;             // Max size of the string buffer
+    } stringData;
+  };
+
+  // Constexpr constructors for different setting types
+  // TOGGLE/ENUM constructor
+  constexpr SettingDescriptor(const char* name_, SettingType type_, uint8_t CrossPointSettings::* ptr, uint8_t defVal,
+                              SettingValidator val, const char* const* enumVals, uint8_t enumCnt)
+      : SettingDescriptorBase{name_, type_},
+        memberPtr(ptr),
+        defaultValue(defVal),
+        validator(val),
+        enumData{enumVals, enumCnt} {}
+
+  // VALUE constructor
+  constexpr SettingDescriptor(const char* name_, SettingType type_, uint8_t CrossPointSettings::* ptr, uint8_t defVal,
+                              SettingValidator val, ValueRange valRange)
+      : SettingDescriptorBase{name_, type_},
+        memberPtr(ptr),
+        defaultValue(defVal),
+        validator(val),
+        valueRange(valRange) {}
+
+  // STRING constructor
+  constexpr SettingDescriptor(const char* name_, SettingType type_, char* strPtr, const char* defStr, size_t maxSz)
+      : SettingDescriptorBase{name_, type_},
+        stringPtr(strPtr),
+        defaultValue(0),
+        validator(nullptr),
+        stringData{defStr, maxSz} {}
+
+  bool validate(const CrossPointSettings& settings) const;
+  uint8_t getValue(const CrossPointSettings& settings) const;
+  void setValue(CrossPointSettings& settings, uint8_t value) const;
+  void resetToDefault(CrossPointSettings& settings) const;
+  void save(FsFile& file, const CrossPointSettings& settings) const;
+  void load(FsFile& file, CrossPointSettings& settings) const;
+
+  // Helper to get enum value as string
+  const char* getEnumValueString(uint8_t index) const {
+    if (index < enumData.count && enumData.values) {
+      return enumData.values[index];
+    }
+    return "";
+  }
+};
+
+// Validator functions (constexpr for compile-time optimization)
+constexpr bool validateToggle(uint8_t v) { return v <= 1; }
+template <uint8_t MAX>
+constexpr bool validateEnum(uint8_t v) {
+  return v < MAX;
+}
+template <uint8_t MIN, uint8_t MAX>
+constexpr bool validateRange(uint8_t v) {
+  return v >= MIN && v <= MAX;
+}
 
 class CrossPointSettings {
  private:
@@ -15,13 +121,17 @@ class CrossPointSettings {
   CrossPointSettings(const CrossPointSettings&) = delete;
   CrossPointSettings& operator=(const CrossPointSettings&) = delete;
 
-  enum SLEEP_SCREEN_MODE { DARK = 0, LIGHT = 1, CUSTOM = 2, COVER = 3, BLANK = 4, SLEEP_SCREEN_MODE_COUNT };
-  enum SLEEP_SCREEN_COVER_MODE { FIT = 0, CROP = 1, SLEEP_SCREEN_COVER_MODE_COUNT };
+  // Static constexpr array of all setting descriptors
+  static constexpr size_t DESCRIPTOR_COUNT = 23;
+  static const std::array<SettingDescriptor, DESCRIPTOR_COUNT> descriptors;
+
+  // Should match with SettingsActivity text
+  enum SLEEP_SCREEN_MODE { DARK = 0, LIGHT = 1, CUSTOM = 2, COVER = 3, BLANK = 4 };
+  enum SLEEP_SCREEN_COVER_MODE { FIT = 0, CROP = 1 };
   enum SLEEP_SCREEN_COVER_FILTER {
     NO_FILTER = 0,
     BLACK_AND_WHITE = 1,
     INVERTED_BLACK_AND_WHITE = 2,
-    SLEEP_SCREEN_COVER_FILTER_COUNT
   };
 
   // Status bar display type enum
@@ -31,7 +141,6 @@ class CrossPointSettings {
     FULL = 2,
     FULL_WITH_PROGRESS_BAR = 3,
     ONLY_PROGRESS_BAR = 4,
-    STATUS_BAR_MODE_COUNT
   };
 
   enum ORIENTATION {
@@ -39,7 +148,6 @@ class CrossPointSettings {
     LANDSCAPE_CW = 1,   // 800x480 logical coordinates, rotated 180° (swap top/bottom)
     INVERTED = 2,       // 480x800 logical coordinates, inverted
     LANDSCAPE_CCW = 3,  // 800x480 logical coordinates, native panel orientation
-    ORIENTATION_COUNT
   };
 
   // Front button layout options
@@ -50,25 +158,23 @@ class CrossPointSettings {
     LEFT_RIGHT_BACK_CONFIRM = 1,
     LEFT_BACK_CONFIRM_RIGHT = 2,
     BACK_CONFIRM_RIGHT_LEFT = 3,
-    FRONT_BUTTON_LAYOUT_COUNT
   };
 
   // Side button layout options
   // Default: Previous, Next
   // Swapped: Next, Previous
-  enum SIDE_BUTTON_LAYOUT { PREV_NEXT = 0, NEXT_PREV = 1, SIDE_BUTTON_LAYOUT_COUNT };
+  enum SIDE_BUTTON_LAYOUT { PREV_NEXT = 0, NEXT_PREV = 1 };
 
   // Font family options
-  enum FONT_FAMILY { BOOKERLY = 0, NOTOSANS = 1, OPENDYSLEXIC = 2, FONT_FAMILY_COUNT };
+  enum FONT_FAMILY { BOOKERLY = 0, NOTOSANS = 1, OPENDYSLEXIC = 2 };
   // Font size options
-  enum FONT_SIZE { SMALL = 0, MEDIUM = 1, LARGE = 2, EXTRA_LARGE = 3, FONT_SIZE_COUNT };
-  enum LINE_COMPRESSION { TIGHT = 0, NORMAL = 1, WIDE = 2, LINE_COMPRESSION_COUNT };
+  enum FONT_SIZE { SMALL = 0, MEDIUM = 1, LARGE = 2, EXTRA_LARGE = 3 };
+  enum LINE_COMPRESSION { TIGHT = 0, NORMAL = 1, WIDE = 2 };
   enum PARAGRAPH_ALIGNMENT {
     JUSTIFIED = 0,
     LEFT_ALIGN = 1,
     CENTER_ALIGN = 2,
     RIGHT_ALIGN = 3,
-    PARAGRAPH_ALIGNMENT_COUNT
   };
 
   // Auto-sleep timeout options (in minutes)
@@ -78,7 +184,6 @@ class CrossPointSettings {
     SLEEP_10_MIN = 2,
     SLEEP_15_MIN = 3,
     SLEEP_30_MIN = 4,
-    SLEEP_TIMEOUT_COUNT
   };
 
   // E-ink refresh frequency (pages between full refreshes)
@@ -88,14 +193,13 @@ class CrossPointSettings {
     REFRESH_10 = 2,
     REFRESH_15 = 3,
     REFRESH_30 = 4,
-    REFRESH_FREQUENCY_COUNT
   };
 
   // Short power button press actions
-  enum SHORT_PWRBTN { IGNORE = 0, SLEEP = 1, PAGE_TURN = 2, SHORT_PWRBTN_COUNT };
+  enum SHORT_PWRBTN { IGNORE = 0, SLEEP = 1, PAGE_TURN = 2 };
 
   // Hide battery percentage
-  enum HIDE_BATTERY_PERCENTAGE { HIDE_NEVER = 0, HIDE_READER = 1, HIDE_ALWAYS = 2, HIDE_BATTERY_PERCENTAGE_COUNT };
+  enum HIDE_BATTERY_PERCENTAGE { HIDE_NEVER = 0, HIDE_READER = 1, HIDE_ALWAYS = 2 };
 
   // Sleep screen settings
   uint8_t sleepScreen = DARK;

src/activities/home/HomeActivity.cpp

@@ -4,6 +4,7 @@
 #include <Epub.h>
 #include <GfxRenderer.h>
 #include <SDCardManager.h>
+#include <Utf8.h>
 #include <Xtc.h>
 
 #include <cstring>
@@ -366,7 +367,7 @@ void HomeActivity::render() {
         while (!lines.back().empty() && renderer.getTextWidth(UI_12_FONT_ID, lines.back().c_str()) > maxLineWidth) {
           // Remove "..." first, then remove one UTF-8 char, then add "..." back
           lines.back().resize(lines.back().size() - 3);  // Remove "..."
-          StringUtils::utf8RemoveLastChar(lines.back());
+          utf8RemoveLastChar(lines.back());
           lines.back().append("...");
         }
         break;
@@ -375,7 +376,7 @@ void HomeActivity::render() {
       int wordWidth = renderer.getTextWidth(UI_12_FONT_ID, i.c_str());
       while (wordWidth > maxLineWidth && !i.empty()) {
         // Word itself is too long, trim it (UTF-8 safe)
-        StringUtils::utf8RemoveLastChar(i);
+        utf8RemoveLastChar(i);
         // Check if we have room for ellipsis
         std::string withEllipsis = i + "...";
         wordWidth = renderer.getTextWidth(UI_12_FONT_ID, withEllipsis.c_str());
@@ -428,7 +429,7 @@ void HomeActivity::render() {
       if (!lastBookAuthor.empty()) {
         std::string trimmedAuthor = lastBookAuthor;
         while (renderer.getTextWidth(UI_10_FONT_ID, trimmedAuthor.c_str()) > maxLineWidth && !trimmedAuthor.empty()) {
-          StringUtils::utf8RemoveLastChar(trimmedAuthor);
+          utf8RemoveLastChar(trimmedAuthor);
         }
         if (renderer.getTextWidth(UI_10_FONT_ID, trimmedAuthor.c_str()) <
             renderer.getTextWidth(UI_10_FONT_ID, lastBookAuthor.c_str())) {
@@ -462,14 +463,14 @@ void HomeActivity::render() {
       // Trim author if too long (UTF-8 safe)
       bool wasTrimmed = false;
       while (renderer.getTextWidth(UI_10_FONT_ID, trimmedAuthor.c_str()) > maxLineWidth && !trimmedAuthor.empty()) {
-        StringUtils::utf8RemoveLastChar(trimmedAuthor);
+        utf8RemoveLastChar(trimmedAuthor);
         wasTrimmed = true;
       }
       if (wasTrimmed && !trimmedAuthor.empty()) {
         // Make room for ellipsis
         while (renderer.getTextWidth(UI_10_FONT_ID, (trimmedAuthor + "...").c_str()) > maxLineWidth &&
                !trimmedAuthor.empty()) {
-          StringUtils::utf8RemoveLastChar(trimmedAuthor);
+          utf8RemoveLastChar(trimmedAuthor);
         }
         trimmedAuthor.append("...");
       }

src/activities/reader/EpubReaderActivity.cpp

@@ -570,8 +570,8 @@ void EpubReaderActivity::renderStatusBar(const int orientedMarginRight, const in
         availableTitleSpace = rendererableScreenWidth - titleMarginLeft - titleMarginRight;
         titleMarginLeftAdjusted = titleMarginLeft;
       }
-      while (titleWidth > availableTitleSpace && title.length() > 11) {
-        title.replace(title.length() - 8, 8, "...");
+      if (titleWidth > availableTitleSpace) {
+        title = renderer.truncatedText(SMALL_FONT_ID, title.c_str(), availableTitleSpace);
         titleWidth = renderer.getTextWidth(SMALL_FONT_ID, title.c_str());
       }
     }

src/activities/reader/TxtReaderActivity.cpp

@@ -533,8 +533,8 @@ void TxtReaderActivity::renderStatusBar(const int orientedMarginRight, const int
 
     std::string title = txt->getTitle();
     int titleWidth = renderer.getTextWidth(SMALL_FONT_ID, title.c_str());
-    while (titleWidth > availableTextWidth && title.length() > 11) {
-      title.replace(title.length() - 8, 8, "...");
+    if (titleWidth > availableTextWidth) {
+      title = renderer.truncatedText(SMALL_FONT_ID, title.c_str(), availableTextWidth);
       titleWidth = renderer.getTextWidth(SMALL_FONT_ID, title.c_str());
     }
 

src/activities/settings/CategorySettingsActivity.cpp

@@ -62,77 +62,84 @@ void CategorySettingsActivity::loop() {
   }
 
   // Handle navigation
+  const int totalItemsCount = descriptors.size() + actionItems.size();
+
   if (mappedInput.wasPressed(MappedInputManager::Button::Up) ||
       mappedInput.wasPressed(MappedInputManager::Button::Left)) {
-    selectedSettingIndex = (selectedSettingIndex > 0) ? (selectedSettingIndex - 1) : (settingsCount - 1);
+    selectedSettingIndex = (selectedSettingIndex > 0) ? (selectedSettingIndex - 1) : (totalItemsCount - 1);
     updateRequired = true;
   } else if (mappedInput.wasPressed(MappedInputManager::Button::Down) ||
              mappedInput.wasPressed(MappedInputManager::Button::Right)) {
-    selectedSettingIndex = (selectedSettingIndex < settingsCount - 1) ? (selectedSettingIndex + 1) : 0;
+    selectedSettingIndex = (selectedSettingIndex < totalItemsCount - 1) ? (selectedSettingIndex + 1) : 0;
     updateRequired = true;
   }
 }
 
 void CategorySettingsActivity::toggleCurrentSetting() {
-  if (selectedSettingIndex < 0 || selectedSettingIndex >= settingsCount) {
+  const int totalItemsCount = descriptors.size() + actionItems.size();
+
+  if (selectedSettingIndex < 0 || selectedSettingIndex >= totalItemsCount) {
     return;
   }
 
-  const auto& setting = settingsList[selectedSettingIndex];
+  // Check if it's a descriptor or an action item
+  if (selectedSettingIndex < static_cast<int>(descriptors.size())) {
+    // Handle descriptor
+    const auto* desc = descriptors[selectedSettingIndex];
 
-  if (setting.type == SettingType::TOGGLE && setting.valuePtr != nullptr) {
-    // Toggle the boolean value using the member pointer
-    const bool currentValue = SETTINGS.*(setting.valuePtr);
-    SETTINGS.*(setting.valuePtr) = !currentValue;
-  } else if (setting.type == SettingType::ENUM && setting.valuePtr != nullptr) {
-    const uint8_t currentValue = SETTINGS.*(setting.valuePtr);
-    SETTINGS.*(setting.valuePtr) = (currentValue + 1) % static_cast<uint8_t>(setting.enumValues.size());
-  } else if (setting.type == SettingType::VALUE && setting.valuePtr != nullptr) {
-    const int8_t currentValue = SETTINGS.*(setting.valuePtr);
-    if (currentValue + setting.valueRange.step > setting.valueRange.max) {
-      SETTINGS.*(setting.valuePtr) = setting.valueRange.min;
+    if (desc->type == SettingType::TOGGLE) {
+      uint8_t currentValue = desc->getValue(SETTINGS);
+      desc->setValue(SETTINGS, !currentValue);
+    } else if (desc->type == SettingType::ENUM) {
+      uint8_t currentValue = desc->getValue(SETTINGS);
+      desc->setValue(SETTINGS, (currentValue + 1) % desc->enumData.count);
+    } else if (desc->type == SettingType::VALUE) {
+      uint8_t currentValue = desc->getValue(SETTINGS);
+      if (currentValue + desc->valueRange.step > desc->valueRange.max) {
+        desc->setValue(SETTINGS, desc->valueRange.min);
       } else {
-      SETTINGS.*(setting.valuePtr) = currentValue + setting.valueRange.step;
+        desc->setValue(SETTINGS, currentValue + desc->valueRange.step);
       }
-  } else if (setting.type == SettingType::ACTION) {
-    if (strcmp(setting.name, "KOReader Sync") == 0) {
+    }
+
+    SETTINGS.saveToFile();
+  } else {
+    // Handle action item
+    const int actionIndex = selectedSettingIndex - descriptors.size();
+    const auto& action = actionItems[actionIndex];
+
     xSemaphoreTake(renderingMutex, portMAX_DELAY);
     exitActivity();
+
+    switch (action.type) {
+      case ActionItem::Type::KOREADER_SYNC:
         enterNewActivity(new KOReaderSettingsActivity(renderer, mappedInput, [this] {
           exitActivity();
           updateRequired = true;
         }));
-      xSemaphoreGive(renderingMutex);
-    } else if (strcmp(setting.name, "OPDS Browser") == 0) {
-      xSemaphoreTake(renderingMutex, portMAX_DELAY);
-      exitActivity();
+        break;
+      case ActionItem::Type::CALIBRE_SETTINGS:
         enterNewActivity(new CalibreSettingsActivity(renderer, mappedInput, [this] {
           exitActivity();
           updateRequired = true;
         }));
-      xSemaphoreGive(renderingMutex);
-    } else if (strcmp(setting.name, "Clear Cache") == 0) {
-      xSemaphoreTake(renderingMutex, portMAX_DELAY);
-      exitActivity();
+        break;
+      case ActionItem::Type::CLEAR_CACHE:
         enterNewActivity(new ClearCacheActivity(renderer, mappedInput, [this] {
           exitActivity();
           updateRequired = true;
         }));
-      xSemaphoreGive(renderingMutex);
-    } else if (strcmp(setting.name, "Check for updates") == 0) {
-      xSemaphoreTake(renderingMutex, portMAX_DELAY);
-      exitActivity();
+        break;
+      case ActionItem::Type::CHECK_UPDATES:
         enterNewActivity(new OtaUpdateActivity(renderer, mappedInput, [this] {
           exitActivity();
           updateRequired = true;
         }));
-      xSemaphoreGive(renderingMutex);
-    }
-  } else {
-    return;
+        break;
     }
 
-  SETTINGS.saveToFile();
+    xSemaphoreGive(renderingMutex);
+  }
 }
 
 void CategorySettingsActivity::displayTaskLoop() {
@@ -153,29 +160,31 @@ void CategorySettingsActivity::render() const {
   const auto pageWidth = renderer.getScreenWidth();
   const auto pageHeight = renderer.getScreenHeight();
 
+  // Draw header with category name
   renderer.drawCenteredText(UI_12_FONT_ID, 15, categoryName, true, EpdFontFamily::BOLD);
 
   // Draw selection highlight
   renderer.fillRect(0, 60 + selectedSettingIndex * 30 - 2, pageWidth - 1, 30);
 
-  // Draw all settings
-  for (int i = 0; i < settingsCount; i++) {
-    const int settingY = 60 + i * 30;  // 30 pixels between settings
+  // Draw all descriptors
+  for (size_t i = 0; i < descriptors.size(); i++) {
+    const auto* desc = descriptors[i];
+    const int settingY = 60 + i * 30;
     const bool isSelected = (i == selectedSettingIndex);
 
     // Draw setting name
-    renderer.drawText(UI_10_FONT_ID, 20, settingY, settingsList[i].name, !isSelected);
+    renderer.drawText(UI_10_FONT_ID, 20, settingY, desc->name, !isSelected);
 
     // Draw value based on setting type
     std::string valueText;
-    if (settingsList[i].type == SettingType::TOGGLE && settingsList[i].valuePtr != nullptr) {
-      const bool value = SETTINGS.*(settingsList[i].valuePtr);
+    if (desc->type == SettingType::TOGGLE) {
+      const bool value = desc->getValue(SETTINGS);
       valueText = value ? "ON" : "OFF";
-    } else if (settingsList[i].type == SettingType::ENUM && settingsList[i].valuePtr != nullptr) {
-      const uint8_t value = SETTINGS.*(settingsList[i].valuePtr);
-      valueText = settingsList[i].enumValues[value];
-    } else if (settingsList[i].type == SettingType::VALUE && settingsList[i].valuePtr != nullptr) {
-      valueText = std::to_string(SETTINGS.*(settingsList[i].valuePtr));
+    } else if (desc->type == SettingType::ENUM) {
+      const uint8_t value = desc->getValue(SETTINGS);
+      valueText = desc->getEnumValueString(value);
+    } else if (desc->type == SettingType::VALUE) {
+      valueText = std::to_string(desc->getValue(SETTINGS));
     }
     if (!valueText.empty()) {
       const auto width = renderer.getTextWidth(UI_10_FONT_ID, valueText.c_str());
@@ -183,9 +192,22 @@ void CategorySettingsActivity::render() const {
     }
   }
 
+  // Draw all action items
+  for (size_t i = 0; i < actionItems.size(); i++) {
+    const auto& action = actionItems[i];
+    const int itemIndex = descriptors.size() + i;
+    const int settingY = 60 + itemIndex * 30;
+    const bool isSelected = (itemIndex == selectedSettingIndex);
+
+    // Draw action name
+    renderer.drawText(UI_10_FONT_ID, 20, settingY, action.name, !isSelected);
+  }
+
+  // Draw version text above button hints
   renderer.drawText(SMALL_FONT_ID, pageWidth - 20 - renderer.getTextWidth(SMALL_FONT_ID, CROSSPOINT_VERSION),
                     pageHeight - 60, CROSSPOINT_VERSION);
 
+  // Draw help text
   const auto labels = mappedInput.mapLabels("« Back", "Toggle", "", "");
   renderer.drawButtonHints(UI_10_FONT_ID, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 

src/activities/settings/CategorySettingsActivity.h

@@ -7,38 +7,14 @@
 #include <string>
 #include <vector>
 
+#include "CrossPointSettings.h"
 #include "activities/ActivityWithSubactivity.h"
 
-class CrossPointSettings;
-
-enum class SettingType { TOGGLE, ENUM, ACTION, VALUE };
-
-struct SettingInfo {
+// Action items for the System category
+struct ActionItem {
   const char* name;
-  SettingType type;
-  uint8_t CrossPointSettings::* valuePtr;
-  std::vector<std::string> enumValues;
-
-  struct ValueRange {
-    uint8_t min;
-    uint8_t max;
-    uint8_t step;
-  };
-  ValueRange valueRange;
-
-  static SettingInfo Toggle(const char* name, uint8_t CrossPointSettings::* ptr) {
-    return {name, SettingType::TOGGLE, ptr};
-  }
-
-  static SettingInfo Enum(const char* name, uint8_t CrossPointSettings::* ptr, std::vector<std::string> values) {
-    return {name, SettingType::ENUM, ptr, std::move(values)};
-  }
-
-  static SettingInfo Action(const char* name) { return {name, SettingType::ACTION, nullptr}; }
-
-  static SettingInfo Value(const char* name, uint8_t CrossPointSettings::* ptr, const ValueRange valueRange) {
-    return {name, SettingType::VALUE, ptr, {}, valueRange};
-  }
+  enum class Type { KOREADER_SYNC, CALIBRE_SETTINGS, CLEAR_CACHE, CHECK_UPDATES };
+  Type type;
 };
 
 class CategorySettingsActivity final : public ActivityWithSubactivity {
@@ -47,8 +23,8 @@ class CategorySettingsActivity final : public ActivityWithSubactivity {
   bool updateRequired = false;
   int selectedSettingIndex = 0;
   const char* categoryName;
-  const SettingInfo* settingsList;
-  int settingsCount;
+  const std::vector<const SettingDescriptor*> descriptors;
+  const std::vector<ActionItem> actionItems;
   const std::function<void()> onGoBack;
 
   static void taskTrampoline(void* param);
@@ -58,11 +34,12 @@ class CategorySettingsActivity final : public ActivityWithSubactivity {
 
  public:
   CategorySettingsActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, const char* categoryName,
-                           const SettingInfo* settingsList, int settingsCount, const std::function<void()>& onGoBack)
+                           const std::vector<const SettingDescriptor*>& descriptors,
+                           const std::vector<ActionItem>& actionItems, const std::function<void()>& onGoBack)
       : ActivityWithSubactivity("CategorySettings", renderer, mappedInput),
         categoryName(categoryName),
-        settingsList(settingsList),
-        settingsCount(settingsCount),
+        descriptors(descriptors),
+        actionItems(actionItems),
         onGoBack(onGoBack) {}
   void onEnter() override;
   void onExit() override;

src/activities/settings/SettingsActivity.cpp

@@ -3,6 +3,8 @@
 #include <GfxRenderer.h>
 #include <HardwareSerial.h>
 
+#include <algorithm>
+
 #include "CategorySettingsActivity.h"
 #include "CrossPointSettings.h"
 #include "MappedInputManager.h"
@@ -10,51 +12,12 @@
 
 const char* SettingsActivity::categoryNames[categoryCount] = {"Display", "Reader", "Controls", "System"};
 
-namespace {
-constexpr int displaySettingsCount = 6;
-const SettingInfo displaySettings[displaySettingsCount] = {
-    // Should match with SLEEP_SCREEN_MODE
-    SettingInfo::Enum("Sleep Screen", &CrossPointSettings::sleepScreen, {"Dark", "Light", "Custom", "Cover", "None"}),
-    SettingInfo::Enum("Sleep Screen Cover Mode", &CrossPointSettings::sleepScreenCoverMode, {"Fit", "Crop"}),
-    SettingInfo::Enum("Sleep Screen Cover Filter", &CrossPointSettings::sleepScreenCoverFilter,
-                      {"None", "Contrast", "Inverted"}),
-    SettingInfo::Enum("Status Bar", &CrossPointSettings::statusBar,
-                      {"None", "No Progress", "Full w/ Percentage", "Full w/ Progress Bar", "Progress Bar"}),
-    SettingInfo::Enum("Hide Battery %", &CrossPointSettings::hideBatteryPercentage, {"Never", "In Reader", "Always"}),
-    SettingInfo::Enum("Refresh Frequency", &CrossPointSettings::refreshFrequency,
-                      {"1 page", "5 pages", "10 pages", "15 pages", "30 pages"})};
-
-constexpr int readerSettingsCount = 9;
-const SettingInfo readerSettings[readerSettingsCount] = {
-    SettingInfo::Enum("Font Family", &CrossPointSettings::fontFamily, {"Bookerly", "Noto Sans", "Open Dyslexic"}),
-    SettingInfo::Enum("Font Size", &CrossPointSettings::fontSize, {"Small", "Medium", "Large", "X Large"}),
-    SettingInfo::Enum("Line Spacing", &CrossPointSettings::lineSpacing, {"Tight", "Normal", "Wide"}),
-    SettingInfo::Value("Screen Margin", &CrossPointSettings::screenMargin, {5, 40, 5}),
-    SettingInfo::Enum("Paragraph Alignment", &CrossPointSettings::paragraphAlignment,
-                      {"Justify", "Left", "Center", "Right"}),
-    SettingInfo::Toggle("Hyphenation", &CrossPointSettings::hyphenationEnabled),
-    SettingInfo::Enum("Reading Orientation", &CrossPointSettings::orientation,
-                      {"Portrait", "Landscape CW", "Inverted", "Landscape CCW"}),
-    SettingInfo::Toggle("Extra Paragraph Spacing", &CrossPointSettings::extraParagraphSpacing),
-    SettingInfo::Toggle("Text Anti-Aliasing", &CrossPointSettings::textAntiAliasing)};
-
-constexpr int controlsSettingsCount = 4;
-const SettingInfo controlsSettings[controlsSettingsCount] = {
-    SettingInfo::Enum(
-        "Front Button Layout", &CrossPointSettings::frontButtonLayout,
-        {"Bck, Cnfrm, Lft, Rght", "Lft, Rght, Bck, Cnfrm", "Lft, Bck, Cnfrm, Rght", "Bck, Cnfrm, Rght, Lft"}),
-    SettingInfo::Enum("Side Button Layout (reader)", &CrossPointSettings::sideButtonLayout,
-                      {"Prev, Next", "Next, Prev"}),
-    SettingInfo::Toggle("Long-press Chapter Skip", &CrossPointSettings::longPressChapterSkip),
-    SettingInfo::Enum("Short Power Button Click", &CrossPointSettings::shortPwrBtn, {"Ignore", "Sleep", "Page Turn"})};
-
-constexpr int systemSettingsCount = 5;
-const SettingInfo systemSettings[systemSettingsCount] = {
-    SettingInfo::Enum("Time to Sleep", &CrossPointSettings::sleepTimeout,
-                      {"1 min", "5 min", "10 min", "15 min", "30 min"}),
-    SettingInfo::Action("KOReader Sync"), SettingInfo::Action("OPDS Browser"), SettingInfo::Action("Clear Cache"),
-    SettingInfo::Action("Check for updates")};
-}  // namespace
+// Helper function to find descriptor by member pointer
+static const SettingDescriptor* findDescriptor(uint8_t CrossPointSettings::* memberPtr) {
+  auto it = std::find_if(CrossPointSettings::descriptors.begin(), CrossPointSettings::descriptors.end(),
+                         [memberPtr](const SettingDescriptor& desc) { return desc.memberPtr == memberPtr; });
+  return (it != CrossPointSettings::descriptors.end()) ? &(*it) : nullptr;
+}
 
 void SettingsActivity::taskTrampoline(void* param) {
   auto* self = static_cast<SettingsActivity*>(param);
@@ -125,37 +88,51 @@ void SettingsActivity::loop() {
 }
 
 void SettingsActivity::enterCategory(int categoryIndex) {
-  if (categoryIndex < 0 || categoryIndex >= categoryCount) {
-    return;
+  std::vector<const SettingDescriptor*> descriptors;
+  std::vector<ActionItem> actionItems;
+
+  switch (categoryIndex) {
+    case 0:  // Display
+      descriptors.push_back(findDescriptor(&CrossPointSettings::sleepScreen));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::sleepScreenCoverMode));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::sleepScreenCoverFilter));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::statusBar));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::hideBatteryPercentage));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::refreshFrequency));
+      break;
+
+    case 1:  // Reader
+      descriptors.push_back(findDescriptor(&CrossPointSettings::fontFamily));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::fontSize));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::lineSpacing));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::screenMargin));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::paragraphAlignment));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::hyphenationEnabled));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::orientation));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::extraParagraphSpacing));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::textAntiAliasing));
+      break;
+
+    case 2:  // Controls
+      descriptors.push_back(findDescriptor(&CrossPointSettings::frontButtonLayout));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::sideButtonLayout));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::longPressChapterSkip));
+      descriptors.push_back(findDescriptor(&CrossPointSettings::shortPwrBtn));
+      break;
+
+    case 3:  // System
+      descriptors.push_back(findDescriptor(&CrossPointSettings::sleepTimeout));
+      actionItems.push_back({"KOReader Sync", ActionItem::Type::KOREADER_SYNC});
+      actionItems.push_back({"Calibre Settings", ActionItem::Type::CALIBRE_SETTINGS});
+      actionItems.push_back({"Clear Cache", ActionItem::Type::CLEAR_CACHE});
+      actionItems.push_back({"Check for updates", ActionItem::Type::CHECK_UPDATES});
+      break;
   }
 
   xSemaphoreTake(renderingMutex, portMAX_DELAY);
   exitActivity();
-
-  const SettingInfo* settingsList = nullptr;
-  int settingsCount = 0;
-
-  switch (categoryIndex) {
-    case 0:  // Display
-      settingsList = displaySettings;
-      settingsCount = displaySettingsCount;
-      break;
-    case 1:  // Reader
-      settingsList = readerSettings;
-      settingsCount = readerSettingsCount;
-      break;
-    case 2:  // Controls
-      settingsList = controlsSettings;
-      settingsCount = controlsSettingsCount;
-      break;
-    case 3:  // System
-      settingsList = systemSettings;
-      settingsCount = systemSettingsCount;
-      break;
-  }
-
-  enterNewActivity(new CategorySettingsActivity(renderer, mappedInput, categoryNames[categoryIndex], settingsList,
-                                                settingsCount, [this] {
+  enterNewActivity(new CategorySettingsActivity(renderer, mappedInput, categoryNames[categoryIndex], descriptors,
+                                                actionItems, [this] {
                                                   exitActivity();
                                                   updateRequired = true;
                                                 }));

src/activities/settings/SettingsActivity.h

@@ -9,9 +9,6 @@
 
 #include "activities/ActivityWithSubactivity.h"
 
-class CrossPointSettings;
-struct SettingInfo;
-
 class SettingsActivity final : public ActivityWithSubactivity {
   TaskHandle_t displayTaskHandle = nullptr;
   SemaphoreHandle_t renderingMutex = nullptr;

src/util/StringUtils.cpp

@@ -61,23 +61,4 @@ bool checkFileExtension(const String& fileName, const char* extension) {
   return localFile.endsWith(localExtension);
 }
 
-size_t utf8RemoveLastChar(std::string& str) {
-  if (str.empty()) return 0;
-  size_t pos = str.size() - 1;
-  // Walk back to find the start of the last UTF-8 character
-  // UTF-8 continuation bytes start with 10xxxxxx (0x80-0xBF)
-  while (pos > 0 && (static_cast<unsigned char>(str[pos]) & 0xC0) == 0x80) {
-    --pos;
-  }
-  str.resize(pos);
-  return pos;
-}
-
-// Truncate string by removing N UTF-8 characters from the end
-void utf8TruncateChars(std::string& str, const size_t numChars) {
-  for (size_t i = 0; i < numChars && !str.empty(); ++i) {
-    utf8RemoveLastChar(str);
-  }
-}
-
 }  // namespace StringUtils

src/util/StringUtils.h

@@ -19,10 +19,4 @@ std::string sanitizeFilename(const std::string& name, size_t maxLength = 100);
 bool checkFileExtension(const std::string& fileName, const char* extension);
 bool checkFileExtension(const String& fileName, const char* extension);
 
-// UTF-8 safe string truncation - removes one character from the end
-// Returns the new size after removing one UTF-8 character
-size_t utf8RemoveLastChar(std::string& str);
-
-// Truncate string by removing N UTF-8 characters from the end
-void utf8TruncateChars(std::string& str, size_t numChars);
 }  // namespace StringUtils