Support swapping the functionality of the front buttons (#133)

## Summary

**What is the goal of this PR?** 

Adds a setting to swap the front buttons. The default functionality are:
Back/Confirm/Left/Right. When this setting is enabled they become:
Left/Right/Back/Confirm. This makes it more comfortable to use when
holding in your right hand since your thumb can more easily rest on the
next button. The original firmware has a similar setting.

**What changes are included?**

- Add the new setting.
- Create a mapper to dynamically switch the buttons based on the
setting.
- Use mapper on the various activity screens.
- Update the button hints to reflect the swapped buttons.

## Additional Context

Full disclosure: I used Codex CLI to put this PR together, but did
review it to make sure it makes sense.

Also tested on my device:
https://share.cleanshot.com/k76891NY

README.md

@@ -98,9 +98,9 @@ CrossPoint Reader is pretty aggressive about caching data down to the SD card to
 has ~380KB of usable RAM, so we have to be careful. A lot of the decisions made in the design of the firmware were based
 on this constraint.
 
-### EPUB caching
+### Data caching
 
-The first time chapters of an EPUB are loaded, they are cached to the SD card. Subsequent loads are served from the 
+The first time chapters of a book are loaded, they are cached to the SD card. Subsequent loads are served from the 
 cache. This cache directory exists at `.crosspoint` on the SD card. The structure is as follows:
 
 
@@ -108,25 +108,22 @@ cache. This cache directory exists at `.crosspoint` on the SD card. The structur
 .crosspoint/
 ├── epub_12471232/       # Each EPUB is cached to a subdirectory named `epub_<hash>`
 │   ├── progress.bin     # Stores reading progress (chapter, page, etc.)
-│   ├── 0/               # Each chapter is stored in a subdirectory named by its index (based on the spine order)
-│   │   ├── section.bin  # Section metadata (page count)
-│   │   ├── page_0.bin   # Each page is stored in a separate file, it
-│   │   ├── page_1.bin   #   contains the position (x, y) and text for each word
-│   │   └── ...
-│   ├── 1/
-│   │   ├── section.bin
-│   │   ├── page_0.bin
-│   │   ├── page_1.bin
-│   │   └── ...
-│   └── ...
+│   ├── cover.bmp        # Book cover image (once generated)
+│   ├── book.bin         # Book metadata (title, author, spine, table of contents, etc.)
+│   └── sections/        # All chapter data is stored in the sections subdirectory
+│       ├── 0.bin        # Chapter data (screen count, all text layout info, etc.)
+│       ├── 1.bin        #     files are named by their index in the spine
+│       └── ...
 │
 └── epub_189013891/
 ```
 
-Deleting the `.crosspoint` directory will clear the cache. 
+Deleting the `.crosspoint` directory will clear the entire cache. 
 
-Due the way it's currently implemented, the cache is not automatically cleared when the EPUB is deleted and moving an 
-EPUB file will reset the reading progress.
+Due the way it's currently implemented, the cache is not automatically cleared when a book is deleted and moving a book
+file will use a new cache directory, resetting the reading progress.
+
+For more details on the internal file structures, see the [file formats document](./docs/file-formats.md).
 
 ## Contributing
 

USER_GUIDE.md

@@ -67,6 +67,7 @@ The Settings screen allows you to configure the device's behavior. There are a f
 - **Extra Paragraph Spacing**: If enabled, vertical space will be added between paragraphs in the book, if disabled,
   paragraphs will not have vertical space between them, but will have first word indentation.
 - **Short Power Button Click**: Whether to trigger the power button on a short press or a long press.
+- **Front Button Layout**: Swap the order of the bottom edge buttons from Back/Confirm/Left/Right to Left/Right/Back/Confirm.
 
 ### 3.6 Sleep Screen
 

docs/file-formats.md

@@ -0,0 +1,9 @@
+# File Formats
+
+## `book.bin`
+
+![](./images/file-formats/book-bin.png)
+
+## `section.bin`
+
+![](./images/file-formats/section-bin.png)

lib/Epub/Epub/Page.cpp

@@ -3,20 +3,16 @@
 #include <HardwareSerial.h>
 #include <Serialization.h>
 
-namespace {
-constexpr uint8_t PAGE_FILE_VERSION = 3;
-}
-
 void PageLine::render(GfxRenderer& renderer, const int fontId, const int xOffset, const int yOffset) {
   block->render(renderer, fontId, xPos + xOffset, yPos + yOffset);
 }
 
-void PageLine::serialize(File& file) {
+bool PageLine::serialize(File& file) {
   serialization::writePod(file, xPos);
   serialization::writePod(file, yPos);
 
   // serialize TextBlock pointed to by PageLine
-  block->serialize(file);
+  return block->serialize(file);
 }
 
 std::unique_ptr<PageLine> PageLine::deserialize(File& file) {
@@ -35,27 +31,22 @@ void Page::render(GfxRenderer& renderer, const int fontId, const int xOffset, co
   }
 }
 
-void Page::serialize(File& file) const {
-  serialization::writePod(file, PAGE_FILE_VERSION);
-
+bool Page::serialize(File& file) const {
   const uint32_t count = elements.size();
   serialization::writePod(file, count);
 
   for (const auto& el : elements) {
     // Only PageLine exists currently
     serialization::writePod(file, static_cast<uint8_t>(TAG_PageLine));
-    el->serialize(file);
+    if (!el->serialize(file)) {
+      return false;
+    }
   }
+
+  return true;
 }
 
 std::unique_ptr<Page> Page::deserialize(File& file) {
-  uint8_t version;
-  serialization::readPod(file, version);
-  if (version != PAGE_FILE_VERSION) {
-    Serial.printf("[%lu] [PGE] Deserialization failed: Unknown version %u\n", millis(), version);
-    return nullptr;
-  }
-
   auto page = std::unique_ptr<Page>(new Page());
 
   uint32_t count;

lib/Epub/Epub/Page.h

@@ -18,7 +18,7 @@ class PageElement {
   explicit PageElement(const int16_t xPos, const int16_t yPos) : xPos(xPos), yPos(yPos) {}
   virtual ~PageElement() = default;
   virtual void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) = 0;
-  virtual void serialize(File& file) = 0;
+  virtual bool serialize(File& file) = 0;
 };
 
 // a line from a block element
@@ -29,7 +29,7 @@ class PageLine final : public PageElement {
   PageLine(std::shared_ptr<TextBlock> block, const int16_t xPos, const int16_t yPos)
       : PageElement(xPos, yPos), block(std::move(block)) {}
   void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) override;
-  void serialize(File& file) override;
+  bool serialize(File& file) override;
   static std::unique_ptr<PageLine> deserialize(File& file);
 };
 
@@ -38,6 +38,6 @@ class Page {
   // the list of block index and line numbers on this page
   std::vector<std::shared_ptr<PageElement>> elements;
   void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) const;
-  void serialize(File& file) const;
+  bool serialize(File& file) const;
   static std::unique_ptr<Page> deserialize(File& file);
 };

lib/Epub/Epub/Section.cpp

@@ -8,54 +8,60 @@
 #include "parsers/ChapterHtmlSlimParser.h"
 
 namespace {
-constexpr uint8_t SECTION_FILE_VERSION = 6;
+constexpr uint8_t SECTION_FILE_VERSION = 7;
+constexpr size_t HEADER_SIZE = sizeof(uint8_t) + sizeof(int) + sizeof(float) + sizeof(bool) + sizeof(int) +
+                               sizeof(int) + sizeof(int) + sizeof(size_t);
 }  // namespace
 
-void Section::onPageComplete(std::unique_ptr<Page> page) {
-  const auto filePath = cachePath + "/page_" + std::to_string(pageCount) + ".bin";
-
-  File outputFile;
-  if (!FsHelpers::openFileForWrite("SCT", filePath, outputFile)) {
-    return;
+size_t Section::onPageComplete(std::unique_ptr<Page> page) {
+  if (!file) {
+    Serial.printf("[%lu] [SCT] File not open for writing page %d\n", millis(), pageCount);
+    return 0;
   }
-  page->serialize(outputFile);
-  outputFile.close();
 
+  const auto position = file.position();
+  if (!page->serialize(file)) {
+    Serial.printf("[%lu] [SCT] Failed to serialize page %d\n", millis(), pageCount);
+    return 0;
+  }
   Serial.printf("[%lu] [SCT] Page %d processed\n", millis(), pageCount);
 
   pageCount++;
+  return position;
 }
 
-void Section::writeCacheMetadata(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
-                                 const int viewportWidth, const int viewportHeight) const {
-  File outputFile;
-  if (!FsHelpers::openFileForWrite("SCT", cachePath + "/section.bin", outputFile)) {
+void Section::writeSectionFileHeader(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
+                                     const int viewportWidth, const int viewportHeight) {
+  if (!file) {
+    Serial.printf("[%lu] [SCT] File not open for writing header\n", millis());
     return;
   }
-  serialization::writePod(outputFile, SECTION_FILE_VERSION);
-  serialization::writePod(outputFile, fontId);
-  serialization::writePod(outputFile, lineCompression);
-  serialization::writePod(outputFile, extraParagraphSpacing);
-  serialization::writePod(outputFile, viewportWidth);
-  serialization::writePod(outputFile, viewportHeight);
-  serialization::writePod(outputFile, pageCount);
-  outputFile.close();
+  static_assert(HEADER_SIZE == sizeof(SECTION_FILE_VERSION) + sizeof(fontId) + sizeof(lineCompression) +
+                                   sizeof(extraParagraphSpacing) + sizeof(viewportWidth) + sizeof(viewportHeight) +
+                                   sizeof(pageCount) + sizeof(size_t),
+                "Header size mismatch");
+  serialization::writePod(file, SECTION_FILE_VERSION);
+  serialization::writePod(file, fontId);
+  serialization::writePod(file, lineCompression);
+  serialization::writePod(file, extraParagraphSpacing);
+  serialization::writePod(file, viewportWidth);
+  serialization::writePod(file, viewportHeight);
+  serialization::writePod(file, pageCount);  // Placeholder for page count (will be initially 0 when written)
+  serialization::writePod(file, static_cast<size_t>(0));  // Placeholder for LUT offset
 }
 
-bool Section::loadCacheMetadata(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
-                                const int viewportWidth, const int viewportHeight) {
-  const auto sectionFilePath = cachePath + "/section.bin";
-  File inputFile;
-  if (!FsHelpers::openFileForRead("SCT", sectionFilePath, inputFile)) {
+bool Section::loadSectionFile(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
+                              const int viewportWidth, const int viewportHeight) {
+  if (!FsHelpers::openFileForRead("SCT", filePath, file)) {
     return false;
   }
 
   // Match parameters
   {
     uint8_t version;
-    serialization::readPod(inputFile, version);
+    serialization::readPod(file, version);
     if (version != SECTION_FILE_VERSION) {
-      inputFile.close();
+      file.close();
       Serial.printf("[%lu] [SCT] Deserialization failed: Unknown version %u\n", millis(), version);
       clearCache();
       return false;
@@ -64,41 +70,36 @@ bool Section::loadCacheMetadata(const int fontId, const float lineCompression, c
     int fileFontId, fileViewportWidth, fileViewportHeight;
     float fileLineCompression;
     bool fileExtraParagraphSpacing;
-    serialization::readPod(inputFile, fileFontId);
-    serialization::readPod(inputFile, fileLineCompression);
-    serialization::readPod(inputFile, fileExtraParagraphSpacing);
-    serialization::readPod(inputFile, fileViewportWidth);
-    serialization::readPod(inputFile, fileViewportHeight);
+    serialization::readPod(file, fileFontId);
+    serialization::readPod(file, fileLineCompression);
+    serialization::readPod(file, fileExtraParagraphSpacing);
+    serialization::readPod(file, fileViewportWidth);
+    serialization::readPod(file, fileViewportHeight);
 
     if (fontId != fileFontId || lineCompression != fileLineCompression ||
         extraParagraphSpacing != fileExtraParagraphSpacing || viewportWidth != fileViewportWidth ||
         viewportHeight != fileViewportHeight) {
-      inputFile.close();
+      file.close();
       Serial.printf("[%lu] [SCT] Deserialization failed: Parameters do not match\n", millis());
       clearCache();
       return false;
     }
   }
 
-  serialization::readPod(inputFile, pageCount);
-  inputFile.close();
+  serialization::readPod(file, pageCount);
+  file.close();
   Serial.printf("[%lu] [SCT] Deserialization succeeded: %d pages\n", millis(), pageCount);
   return true;
 }
 
-void Section::setupCacheDir() const {
-  epub->setupCacheDir();
-  SD.mkdir(cachePath.c_str());
-}
-
 // Your updated class method (assuming you are using the 'SD' object, which is a wrapper for a specific filesystem)
 bool Section::clearCache() const {
-  if (!SD.exists(cachePath.c_str())) {
+  if (!SD.exists(filePath.c_str())) {
     Serial.printf("[%lu] [SCT] Cache does not exist, no action needed\n", millis());
     return true;
   }
 
-  if (!FsHelpers::removeDir(cachePath.c_str())) {
+  if (!SD.remove(filePath.c_str())) {
     Serial.printf("[%lu] [SCT] Failed to clear cache\n", millis());
     return false;
   }
@@ -107,10 +108,10 @@ bool Section::clearCache() const {
   return true;
 }
 
-bool Section::persistPageDataToSD(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
-                                  const int viewportWidth, const int viewportHeight,
-                                  const std::function<void()>& progressSetupFn,
-                                  const std::function<void(int)>& progressFn) {
+bool Section::createSectionFile(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
+                                const int viewportWidth, const int viewportHeight,
+                                const std::function<void()>& progressSetupFn,
+                                const std::function<void(int)>& progressFn) {
   constexpr size_t MIN_SIZE_FOR_PROGRESS = 50 * 1024;  // 50KB
   const auto localPath = epub->getSpineItem(spineIndex).href;
   const auto tmpHtmlPath = epub->getCachePath() + "/.tmp_" + std::to_string(spineIndex) + ".html";
@@ -156,30 +157,66 @@ bool Section::persistPageDataToSD(const int fontId, const float lineCompression,
     progressSetupFn();
   }
 
+  if (!FsHelpers::openFileForWrite("SCT", filePath, file)) {
+    return false;
+  }
+  writeSectionFileHeader(fontId, lineCompression, extraParagraphSpacing, viewportWidth, viewportHeight);
+  std::vector<size_t> lut = {};
+
   ChapterHtmlSlimParser visitor(
       tmpHtmlPath, renderer, fontId, lineCompression, extraParagraphSpacing, viewportWidth, viewportHeight,
-      [this](std::unique_ptr<Page> page) { this->onPageComplete(std::move(page)); }, progressFn);
+      [this, &lut](std::unique_ptr<Page> page) { lut.emplace_back(this->onPageComplete(std::move(page))); },
+      progressFn);
   success = visitor.parseAndBuildPages();
 
   SD.remove(tmpHtmlPath.c_str());
   if (!success) {
     Serial.printf("[%lu] [SCT] Failed to parse XML and build pages\n", millis());
+    file.close();
+    SD.remove(filePath.c_str());
     return false;
   }
 
-  writeCacheMetadata(fontId, lineCompression, extraParagraphSpacing, viewportWidth, viewportHeight);
+  const auto lutOffset = file.position();
+  bool hasFailedLutRecords = false;
+  // Write LUT
+  for (const auto& pos : lut) {
+    if (pos == 0) {
+      hasFailedLutRecords = true;
+      break;
+    }
+    serialization::writePod(file, pos);
+  }
 
+  if (hasFailedLutRecords) {
+    Serial.printf("[%lu] [SCT] Failed to write LUT due to invalid page positions\n", millis());
+    file.close();
+    SD.remove(filePath.c_str());
+    return false;
+  }
+
+  // Go back and write LUT offset
+  file.seek(HEADER_SIZE - sizeof(size_t) - sizeof(pageCount));
+  serialization::writePod(file, pageCount);
+  serialization::writePod(file, lutOffset);
+  file.close();
   return true;
 }
 
-std::unique_ptr<Page> Section::loadPageFromSD() const {
-  const auto filePath = cachePath + "/page_" + std::to_string(currentPage) + ".bin";
-
-  File inputFile;
-  if (!FsHelpers::openFileForRead("SCT", filePath, inputFile)) {
+std::unique_ptr<Page> Section::loadPageFromSectionFile() {
+  if (!FsHelpers::openFileForRead("SCT", filePath, file)) {
     return nullptr;
   }
-  auto page = Page::deserialize(inputFile);
-  inputFile.close();
+
+  file.seek(HEADER_SIZE - sizeof(size_t));
+  size_t lutOffset;
+  serialization::readPod(file, lutOffset);
+  file.seek(lutOffset + sizeof(size_t) * currentPage);
+  size_t pagePos;
+  serialization::readPod(file, pagePos);
+  file.seek(pagePos);
+
+  auto page = Page::deserialize(file);
+  file.close();
   return page;
 }

lib/Epub/Epub/Section.h

@@ -11,11 +11,12 @@ class Section {
   std::shared_ptr<Epub> epub;
   const int spineIndex;
   GfxRenderer& renderer;
-  std::string cachePath;
+  std::string filePath;
+  File file;
 
-  void writeCacheMetadata(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
-                          int viewportHeight) const;
-  void onPageComplete(std::unique_ptr<Page> page);
+  void writeSectionFileHeader(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
+                              int viewportHeight);
+  size_t onPageComplete(std::unique_ptr<Page> page);
 
  public:
   int pageCount = 0;
@@ -25,14 +26,13 @@ class Section {
       : epub(epub),
         spineIndex(spineIndex),
         renderer(renderer),
-        cachePath(epub->getCachePath() + "/" + std::to_string(spineIndex)) {}
+        filePath(epub->getCachePath() + "/sections/" + std::to_string(spineIndex) + ".bin") {}
   ~Section() = default;
-  bool loadCacheMetadata(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
-                         int viewportHeight);
-  void setupCacheDir() const;
+  bool loadSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
+                       int viewportHeight);
   bool clearCache() const;
-  bool persistPageDataToSD(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
-                           int viewportHeight, const std::function<void()>& progressSetupFn = nullptr,
-                           const std::function<void(int)>& progressFn = nullptr);
-  std::unique_ptr<Page> loadPageFromSD() const;
+  bool createSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, int viewportWidth,
+                         int viewportHeight, const std::function<void()>& progressSetupFn = nullptr,
+                         const std::function<void(int)>& progressFn = nullptr);
+  std::unique_ptr<Page> loadPageFromSectionFile();
 };

lib/Epub/Epub/blocks/TextBlock.cpp

@@ -24,34 +24,33 @@ void TextBlock::render(const GfxRenderer& renderer, const int fontId, const int
   }
 }
 
-void TextBlock::serialize(File& file) const {
-  // words
-  const uint32_t wc = words.size();
-  serialization::writePod(file, wc);
+bool TextBlock::serialize(File& file) const {
+  if (words.size() != wordXpos.size() || words.size() != wordStyles.size()) {
+    Serial.printf("[%lu] [TXB] Serialization failed: size mismatch (words=%u, xpos=%u, styles=%u)\n", millis(),
+                  words.size(), wordXpos.size(), wordStyles.size());
+    return false;
+  }
+
+  // Word data
+  serialization::writePod(file, static_cast<uint32_t>(words.size()));
   for (const auto& w : words) serialization::writeString(file, w);
-
-  // wordXpos
-  const uint32_t xc = wordXpos.size();
-  serialization::writePod(file, xc);
   for (auto x : wordXpos) serialization::writePod(file, x);
-
-  // wordStyles
-  const uint32_t sc = wordStyles.size();
-  serialization::writePod(file, sc);
   for (auto s : wordStyles) serialization::writePod(file, s);
 
-  // style
+  // Block style
   serialization::writePod(file, style);
+
+  return true;
 }
 
 std::unique_ptr<TextBlock> TextBlock::deserialize(File& file) {
-  uint32_t wc, xc, sc;
+  uint32_t wc;
   std::list<std::string> words;
   std::list<uint16_t> wordXpos;
   std::list<EpdFontStyle> wordStyles;
   BLOCK_STYLE style;
 
-  // words
+  // Word count
   serialization::readPod(file, wc);
 
   // Sanity check: prevent allocation of unreasonably large lists (max 10000 words per block)
@@ -60,27 +59,15 @@ std::unique_ptr<TextBlock> TextBlock::deserialize(File& file) {
     return nullptr;
   }
 
+  // Word data
   words.resize(wc);
+  wordXpos.resize(wc);
+  wordStyles.resize(wc);
   for (auto& w : words) serialization::readString(file, w);
-
-  // wordXpos
-  serialization::readPod(file, xc);
-  wordXpos.resize(xc);
   for (auto& x : wordXpos) serialization::readPod(file, x);
-
-  // wordStyles
-  serialization::readPod(file, sc);
-  wordStyles.resize(sc);
   for (auto& s : wordStyles) serialization::readPod(file, s);
 
-  // Validate data consistency: all three lists must have the same size
-  if (wc != xc || wc != sc) {
-    Serial.printf("[%lu] [TXB] Deserialization failed: size mismatch (words=%u, xpos=%u, styles=%u)\n", millis(), wc,
-                  xc, sc);
-    return nullptr;
-  }
-
-  // style
+  // Block style
   serialization::readPod(file, style);
 
   return std::unique_ptr<TextBlock>(new TextBlock(std::move(words), std::move(wordXpos), std::move(wordStyles), style));

lib/Epub/Epub/blocks/TextBlock.h

@@ -36,6 +36,6 @@ class TextBlock final : public Block {
   // given a renderer works out where to break the words into lines
   void render(const GfxRenderer& renderer, int fontId, int x, int y) const;
   BlockType getType() override { return TEXT_BLOCK; }
-  void serialize(File& file) const;
+  bool serialize(File& file) const;
   static std::unique_ptr<TextBlock> deserialize(File& file);
 };

src/CrossPointSettings.cpp

@@ -11,7 +11,7 @@ CrossPointSettings CrossPointSettings::instance;
 namespace {
 constexpr uint8_t SETTINGS_FILE_VERSION = 1;
 // Increment this when adding new persisted settings fields
-constexpr uint8_t SETTINGS_COUNT = 5;
+constexpr uint8_t SETTINGS_COUNT = 6;
 constexpr char SETTINGS_FILE[] = "/.crosspoint/settings.bin";
 }  // namespace
 
@@ -31,6 +31,7 @@ bool CrossPointSettings::saveToFile() const {
   serialization::writePod(outputFile, shortPwrBtn);
   serialization::writePod(outputFile, statusBar);
   serialization::writePod(outputFile, orientation);
+  serialization::writePod(outputFile, frontButtonLayout);
   outputFile.close();
 
   Serial.printf("[%lu] [CPS] Settings saved to file\n", millis());
@@ -67,6 +68,8 @@ bool CrossPointSettings::loadFromFile() {
     if (++settingsRead >= fileSettingsCount) break;
     serialization::readPod(inputFile, orientation);
     if (++settingsRead >= fileSettingsCount) break;
+    serialization::readPod(inputFile, frontButtonLayout);
+    if (++settingsRead >= fileSettingsCount) break;
   } while (false);
 
   inputFile.close();

src/CrossPointSettings.h

@@ -28,6 +28,11 @@ class CrossPointSettings {
     LANDSCAPE_CCW = 3  // 800x480 logical coordinates, native panel orientation
   };
 
+  // Front button layout options
+  // Default: Back, Confirm, Left, Right
+  // Swapped: Left, Right, Back, Confirm
+  enum FRONT_BUTTON_LAYOUT { BACK_CONFIRM_LEFT_RIGHT = 0, LEFT_RIGHT_BACK_CONFIRM = 1 };
+
   // Sleep screen settings
   uint8_t sleepScreen = DARK;
   // Status bar settings
@@ -39,6 +44,8 @@ class CrossPointSettings {
   // EPUB reading orientation settings
   // 0 = portrait (default), 1 = landscape clockwise, 2 = inverted, 3 = landscape counter-clockwise
   uint8_t orientation = PORTRAIT;
+  // Front button layout
+  uint8_t frontButtonLayout = BACK_CONFIRM_LEFT_RIGHT;
 
   ~CrossPointSettings() = default;
 

src/MappedInputManager.cpp

@@ -0,0 +1,77 @@
+#include "MappedInputManager.h"
+
+decltype(InputManager::BTN_BACK) MappedInputManager::mapButton(const Button button) const {
+  const auto layout = static_cast<CrossPointSettings::FRONT_BUTTON_LAYOUT>(SETTINGS.frontButtonLayout);
+
+  switch (button) {
+    case Button::Back:
+      switch (layout) {
+        case CrossPointSettings::LEFT_RIGHT_BACK_CONFIRM:
+          return InputManager::BTN_LEFT;
+        case CrossPointSettings::BACK_CONFIRM_LEFT_RIGHT:
+        default:
+          return InputManager::BTN_BACK;
+      }
+    case Button::Confirm:
+      switch (layout) {
+        case CrossPointSettings::LEFT_RIGHT_BACK_CONFIRM:
+          return InputManager::BTN_RIGHT;
+        case CrossPointSettings::BACK_CONFIRM_LEFT_RIGHT:
+        default:
+          return InputManager::BTN_CONFIRM;
+      }
+    case Button::Left:
+      switch (layout) {
+        case CrossPointSettings::LEFT_RIGHT_BACK_CONFIRM:
+          return InputManager::BTN_BACK;
+        case CrossPointSettings::BACK_CONFIRM_LEFT_RIGHT:
+        default:
+          return InputManager::BTN_LEFT;
+      }
+    case Button::Right:
+      switch (layout) {
+        case CrossPointSettings::LEFT_RIGHT_BACK_CONFIRM:
+          return InputManager::BTN_CONFIRM;
+        case CrossPointSettings::BACK_CONFIRM_LEFT_RIGHT:
+        default:
+          return InputManager::BTN_RIGHT;
+      }
+    case Button::Up:
+      return InputManager::BTN_UP;
+    case Button::Down:
+      return InputManager::BTN_DOWN;
+    case Button::Power:
+      return InputManager::BTN_POWER;
+    case Button::PageBack:
+      return InputManager::BTN_UP;
+    case Button::PageForward:
+      return InputManager::BTN_DOWN;
+  }
+
+  return InputManager::BTN_BACK;
+}
+
+bool MappedInputManager::wasPressed(const Button button) const { return inputManager.wasPressed(mapButton(button)); }
+
+bool MappedInputManager::wasReleased(const Button button) const { return inputManager.wasReleased(mapButton(button)); }
+
+bool MappedInputManager::isPressed(const Button button) const { return inputManager.isPressed(mapButton(button)); }
+
+bool MappedInputManager::wasAnyPressed() const { return inputManager.wasAnyPressed(); }
+
+bool MappedInputManager::wasAnyReleased() const { return inputManager.wasAnyReleased(); }
+
+unsigned long MappedInputManager::getHeldTime() const { return inputManager.getHeldTime(); }
+
+MappedInputManager::Labels MappedInputManager::mapLabels(const char* back, const char* confirm, const char* previous,
+                                                         const char* next) const {
+  const auto layout = static_cast<CrossPointSettings::FRONT_BUTTON_LAYOUT>(SETTINGS.frontButtonLayout);
+
+  switch (layout) {
+    case CrossPointSettings::LEFT_RIGHT_BACK_CONFIRM:
+      return {previous, next, back, confirm};
+    case CrossPointSettings::BACK_CONFIRM_LEFT_RIGHT:
+    default:
+      return {back, confirm, previous, next};
+  }
+}

src/MappedInputManager.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <InputManager.h>
+
+#include "CrossPointSettings.h"
+
+class MappedInputManager {
+ public:
+  enum class Button { Back, Confirm, Left, Right, Up, Down, Power, PageBack, PageForward };
+
+  struct Labels {
+    const char* btn1;
+    const char* btn2;
+    const char* btn3;
+    const char* btn4;
+  };
+
+  explicit MappedInputManager(InputManager& inputManager) : inputManager(inputManager) {}
+
+  bool wasPressed(Button button) const;
+  bool wasReleased(Button button) const;
+  bool isPressed(Button button) const;
+  bool wasAnyPressed() const;
+  bool wasAnyReleased() const;
+  unsigned long getHeldTime() const;
+  Labels mapLabels(const char* back, const char* confirm, const char* previous, const char* next) const;
+
+ private:
+  InputManager& inputManager;
+  decltype(InputManager::BTN_BACK) mapButton(Button button) const;
+};

src/activities/Activity.h

@@ -5,18 +5,19 @@
 #include <string>
 #include <utility>
 
-class InputManager;
+#include "../MappedInputManager.h"
+
 class GfxRenderer;
 
 class Activity {
  protected:
   std::string name;
   GfxRenderer& renderer;
-  InputManager& inputManager;
+  MappedInputManager& mappedInput;
 
  public:
-  explicit Activity(std::string name, GfxRenderer& renderer, InputManager& inputManager)
-      : name(std::move(name)), renderer(renderer), inputManager(inputManager) {}
+  explicit Activity(std::string name, GfxRenderer& renderer, MappedInputManager& mappedInput)
+      : name(std::move(name)), renderer(renderer), mappedInput(mappedInput) {}
   virtual ~Activity() = default;
   virtual void onEnter() { Serial.printf("[%lu] [ACT] Entering activity: %s\n", millis(), name.c_str()); }
   virtual void onExit() { Serial.printf("[%lu] [ACT] Exiting activity: %s\n", millis(), name.c_str()); }

src/activities/ActivityWithSubactivity.h

@@ -10,8 +10,8 @@ class ActivityWithSubactivity : public Activity {
   void enterNewActivity(Activity* activity);
 
  public:
-  explicit ActivityWithSubactivity(std::string name, GfxRenderer& renderer, InputManager& inputManager)
-      : Activity(std::move(name), renderer, inputManager) {}
+  explicit ActivityWithSubactivity(std::string name, GfxRenderer& renderer, MappedInputManager& mappedInput)
+      : Activity(std::move(name), renderer, mappedInput) {}
   void loop() override;
   void onExit() override;
 };

src/activities/boot_sleep/BootActivity.h

@@ -3,6 +3,7 @@
 
 class BootActivity final : public Activity {
  public:
-  explicit BootActivity(GfxRenderer& renderer, InputManager& inputManager) : Activity("Boot", renderer, inputManager) {}
+  explicit BootActivity(GfxRenderer& renderer, MappedInputManager& mappedInput)
+      : Activity("Boot", renderer, mappedInput) {}
   void onEnter() override;
 };

src/activities/boot_sleep/SleepActivity.h

@@ -5,8 +5,8 @@ class Bitmap;
 
 class SleepActivity final : public Activity {
  public:
-  explicit SleepActivity(GfxRenderer& renderer, InputManager& inputManager)
-      : Activity("Sleep", renderer, inputManager) {}
+  explicit SleepActivity(GfxRenderer& renderer, MappedInputManager& mappedInput)
+      : Activity("Sleep", renderer, mappedInput) {}
   void onEnter() override;
 
  private:

src/activities/home/HomeActivity.cpp

@@ -49,14 +49,14 @@ void HomeActivity::onExit() {
 }
 
 void HomeActivity::loop() {
-  const bool prevPressed =
-      inputManager.wasPressed(InputManager::BTN_UP) || inputManager.wasPressed(InputManager::BTN_LEFT);
-  const bool nextPressed =
-      inputManager.wasPressed(InputManager::BTN_DOWN) || inputManager.wasPressed(InputManager::BTN_RIGHT);
+  const bool prevPressed = mappedInput.wasPressed(MappedInputManager::Button::Up) ||
+                           mappedInput.wasPressed(MappedInputManager::Button::Left);
+  const bool nextPressed = mappedInput.wasPressed(MappedInputManager::Button::Down) ||
+                           mappedInput.wasPressed(MappedInputManager::Button::Right);
 
   const int menuCount = getMenuItemCount();
 
-  if (inputManager.wasReleased(InputManager::BTN_CONFIRM)) {
+  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
     if (hasContinueReading) {
       // Menu: Continue Reading, Browse, File transfer, Settings
       if (selectorIndex == 0) {
@@ -143,7 +143,8 @@ void HomeActivity::render() const {
 
   renderer.drawText(UI_FONT_ID, 20, menuY, "Settings", selectorIndex != menuIndex);
 
-  renderer.drawButtonHints(UI_FONT_ID, "Back", "Confirm", "Left", "Right");
+  const auto labels = mappedInput.mapLabels("Back", "Confirm", "Left", "Right");
+  renderer.drawButtonHints(UI_FONT_ID, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 
   renderer.displayBuffer();
 }

src/activities/home/HomeActivity.h

@@ -24,10 +24,10 @@ class HomeActivity final : public Activity {
   int getMenuItemCount() const;
 
  public:
-  explicit HomeActivity(GfxRenderer& renderer, InputManager& inputManager,
+  explicit HomeActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                         const std::function<void()>& onContinueReading, const std::function<void()>& onReaderOpen,
                         const std::function<void()>& onSettingsOpen, const std::function<void()>& onFileTransferOpen)
-      : Activity("Home", renderer, inputManager),
+      : Activity("Home", renderer, mappedInput),
         onContinueReading(onContinueReading),
         onReaderOpen(onReaderOpen),
         onSettingsOpen(onSettingsOpen),

src/activities/network/CrossPointWebServerActivity.cpp

@@ -57,7 +57,7 @@ void CrossPointWebServerActivity::onEnter() {
   // Launch network mode selection subactivity
   Serial.printf("[%lu] [WEBACT] Launching NetworkModeSelectionActivity...\n", millis());
   enterNewActivity(new NetworkModeSelectionActivity(
-      renderer, inputManager, [this](const NetworkMode mode) { onNetworkModeSelected(mode); },
+      renderer, mappedInput, [this](const NetworkMode mode) { onNetworkModeSelected(mode); },
       [this]() { onGoBack(); }  // Cancel goes back to home
       ));
 }
@@ -141,7 +141,7 @@ void CrossPointWebServerActivity::onNetworkModeSelected(const NetworkMode mode)
 
     state = WebServerActivityState::WIFI_SELECTION;
     Serial.printf("[%lu] [WEBACT] Launching WifiSelectionActivity...\n", millis());
-    enterNewActivity(new WifiSelectionActivity(renderer, inputManager,
+    enterNewActivity(new WifiSelectionActivity(renderer, mappedInput,
                                                [this](const bool connected) { onWifiSelectionComplete(connected); }));
   } else {
     // AP mode - start access point
@@ -174,7 +174,7 @@ void CrossPointWebServerActivity::onWifiSelectionComplete(const bool connected)
     exitActivity();
     state = WebServerActivityState::MODE_SELECTION;
     enterNewActivity(new NetworkModeSelectionActivity(
-        renderer, inputManager, [this](const NetworkMode mode) { onNetworkModeSelected(mode); },
+        renderer, mappedInput, [this](const NetworkMode mode) { onNetworkModeSelected(mode); },
         [this]() { onGoBack(); }));
   }
 }
@@ -305,7 +305,7 @@ void CrossPointWebServerActivity::loop() {
     }
 
     // Handle exit on Back button
-    if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
       onGoBack();
       return;
     }
@@ -428,5 +428,6 @@ void CrossPointWebServerActivity::renderServerRunning() const {
                               REGULAR);
   }
 
-  renderer.drawButtonHints(UI_FONT_ID, "« Exit", "", "", "");
+  const auto labels = mappedInput.mapLabels("« Exit", "", "", "");
+  renderer.drawButtonHints(UI_FONT_ID, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 }

src/activities/network/CrossPointWebServerActivity.h

@@ -63,9 +63,9 @@ class CrossPointWebServerActivity final : public ActivityWithSubactivity {
   void stopWebServer();
 
  public:
-  explicit CrossPointWebServerActivity(GfxRenderer& renderer, InputManager& inputManager,
+  explicit CrossPointWebServerActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                                        const std::function<void()>& onGoBack)
-      : ActivityWithSubactivity("CrossPointWebServer", renderer, inputManager), onGoBack(onGoBack) {}
+      : ActivityWithSubactivity("CrossPointWebServer", renderer, mappedInput), onGoBack(onGoBack) {}
   void onEnter() override;
   void onExit() override;
   void loop() override;

src/activities/network/NetworkModeSelectionActivity.cpp

@@ -51,23 +51,23 @@ void NetworkModeSelectionActivity::onExit() {
 
 void NetworkModeSelectionActivity::loop() {
   // Handle back button - cancel
-  if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
     onCancel();
     return;
   }
 
   // Handle confirm button - select current option
-  if (inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
     const NetworkMode mode = (selectedIndex == 0) ? NetworkMode::JOIN_NETWORK : NetworkMode::CREATE_HOTSPOT;
     onModeSelected(mode);
     return;
   }
 
   // Handle navigation
-  const bool prevPressed =
-      inputManager.wasPressed(InputManager::BTN_UP) || inputManager.wasPressed(InputManager::BTN_LEFT);
-  const bool nextPressed =
-      inputManager.wasPressed(InputManager::BTN_DOWN) || inputManager.wasPressed(InputManager::BTN_RIGHT);
+  const bool prevPressed = mappedInput.wasPressed(MappedInputManager::Button::Up) ||
+                           mappedInput.wasPressed(MappedInputManager::Button::Left);
+  const bool nextPressed = mappedInput.wasPressed(MappedInputManager::Button::Down) ||
+                           mappedInput.wasPressed(MappedInputManager::Button::Right);
 
   if (prevPressed) {
     selectedIndex = (selectedIndex + MENU_ITEM_COUNT - 1) % MENU_ITEM_COUNT;
@@ -122,7 +122,8 @@ void NetworkModeSelectionActivity::render() const {
   }
 
   // Draw help text at bottom
-  renderer.drawButtonHints(UI_FONT_ID, "« Back", "Select", "", "");
+  const auto labels = mappedInput.mapLabels("« Back", "Select", "", "");
+  renderer.drawButtonHints(UI_FONT_ID, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 
   renderer.displayBuffer();
 }

src/activities/network/NetworkModeSelectionActivity.h

@@ -31,10 +31,10 @@ class NetworkModeSelectionActivity final : public Activity {
   void render() const;
 
  public:
-  explicit NetworkModeSelectionActivity(GfxRenderer& renderer, InputManager& inputManager,
+  explicit NetworkModeSelectionActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                                         const std::function<void(NetworkMode)>& onModeSelected,
                                         const std::function<void()>& onCancel)
-      : Activity("NetworkModeSelection", renderer, inputManager), onModeSelected(onModeSelected), onCancel(onCancel) {}
+      : Activity("NetworkModeSelection", renderer, mappedInput), onModeSelected(onModeSelected), onCancel(onCancel) {}
   void onEnter() override;
   void onExit() override;
   void loop() override;

src/activities/network/WifiSelectionActivity.cpp

@@ -190,7 +190,7 @@ void WifiSelectionActivity::selectNetwork(const int index) {
     // Don't allow screen updates while changing activity
     xSemaphoreTake(renderingMutex, portMAX_DELAY);
     enterNewActivity(new KeyboardEntryActivity(
-        renderer, inputManager, "Enter WiFi Password",
+        renderer, mappedInput, "Enter WiFi Password",
         "",     // No initial text
         50,     // Y position
         64,     // Max password length
@@ -302,17 +302,19 @@ void WifiSelectionActivity::loop() {
 
   // Handle save prompt state
   if (state == WifiSelectionState::SAVE_PROMPT) {
-    if (inputManager.wasPressed(InputManager::BTN_LEFT) || inputManager.wasPressed(InputManager::BTN_UP)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Up) ||
+        mappedInput.wasPressed(MappedInputManager::Button::Left)) {
       if (savePromptSelection > 0) {
         savePromptSelection--;
         updateRequired = true;
       }
-    } else if (inputManager.wasPressed(InputManager::BTN_RIGHT) || inputManager.wasPressed(InputManager::BTN_DOWN)) {
+    } else if (mappedInput.wasPressed(MappedInputManager::Button::Down) ||
+               mappedInput.wasPressed(MappedInputManager::Button::Right)) {
       if (savePromptSelection < 1) {
         savePromptSelection++;
         updateRequired = true;
       }
-    } else if (inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
+    } else if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
       if (savePromptSelection == 0) {
         // User chose "Yes" - save the password
         xSemaphoreTake(renderingMutex, portMAX_DELAY);
@@ -321,7 +323,7 @@ void WifiSelectionActivity::loop() {
       }
       // Complete - parent will start web server
       onComplete(true);
-    } else if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+    } else if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
       // Skip saving, complete anyway
       onComplete(true);
     }
@@ -330,17 +332,19 @@ void WifiSelectionActivity::loop() {
 
   // Handle forget prompt state (connection failed with saved credentials)
   if (state == WifiSelectionState::FORGET_PROMPT) {
-    if (inputManager.wasPressed(InputManager::BTN_LEFT) || inputManager.wasPressed(InputManager::BTN_UP)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Up) ||
+        mappedInput.wasPressed(MappedInputManager::Button::Left)) {
       if (forgetPromptSelection > 0) {
         forgetPromptSelection--;
         updateRequired = true;
       }
-    } else if (inputManager.wasPressed(InputManager::BTN_RIGHT) || inputManager.wasPressed(InputManager::BTN_DOWN)) {
+    } else if (mappedInput.wasPressed(MappedInputManager::Button::Down) ||
+               mappedInput.wasPressed(MappedInputManager::Button::Right)) {
       if (forgetPromptSelection < 1) {
         forgetPromptSelection++;
         updateRequired = true;
       }
-    } else if (inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
+    } else if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
       if (forgetPromptSelection == 0) {
         // User chose "Yes" - forget the network
         xSemaphoreTake(renderingMutex, portMAX_DELAY);
@@ -356,7 +360,7 @@ void WifiSelectionActivity::loop() {
       // Go back to network list
       state = WifiSelectionState::NETWORK_LIST;
       updateRequired = true;
-    } else if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+    } else if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
       // Skip forgetting, go back to network list
       state = WifiSelectionState::NETWORK_LIST;
       updateRequired = true;
@@ -373,7 +377,8 @@ void WifiSelectionActivity::loop() {
 
   // Handle connection failed state
   if (state == WifiSelectionState::CONNECTION_FAILED) {
-    if (inputManager.wasPressed(InputManager::BTN_BACK) || inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Back) ||
+        mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
       // If we used saved credentials, offer to forget the network
       if (usedSavedPassword) {
         state = WifiSelectionState::FORGET_PROMPT;
@@ -390,13 +395,13 @@ void WifiSelectionActivity::loop() {
   // Handle network list state
   if (state == WifiSelectionState::NETWORK_LIST) {
     // Check for Back button to exit (cancel)
-    if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
       onComplete(false);
       return;
     }
 
     // Check for Confirm button to select network or rescan
-    if (inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
       if (!networks.empty()) {
         selectNetwork(selectedNetworkIndex);
       } else {
@@ -406,12 +411,14 @@ void WifiSelectionActivity::loop() {
     }
 
     // Handle UP/DOWN navigation
-    if (inputManager.wasPressed(InputManager::BTN_UP) || inputManager.wasPressed(InputManager::BTN_LEFT)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Up) ||
+        mappedInput.wasPressed(MappedInputManager::Button::Left)) {
       if (selectedNetworkIndex > 0) {
         selectedNetworkIndex--;
         updateRequired = true;
       }
-    } else if (inputManager.wasPressed(InputManager::BTN_DOWN) || inputManager.wasPressed(InputManager::BTN_RIGHT)) {
+    } else if (mappedInput.wasPressed(MappedInputManager::Button::Down) ||
+               mappedInput.wasPressed(MappedInputManager::Button::Right)) {
       if (!networks.empty() && selectedNetworkIndex < static_cast<int>(networks.size()) - 1) {
         selectedNetworkIndex++;
         updateRequired = true;
@@ -557,7 +564,8 @@ void WifiSelectionActivity::renderNetworkList() const {
 
   // Draw help text
   renderer.drawText(SMALL_FONT_ID, 20, pageHeight - 75, "* = Encrypted | + = Saved");
-  renderer.drawButtonHints(UI_FONT_ID, "« Back", "Connect", "", "");
+  const auto labels = mappedInput.mapLabels("« Back", "Connect", "", "");
+  renderer.drawButtonHints(UI_FONT_ID, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 }
 
 void WifiSelectionActivity::renderConnecting() const {

src/activities/network/WifiSelectionActivity.h

@@ -92,9 +92,9 @@ class WifiSelectionActivity final : public ActivityWithSubactivity {
   std::string getSignalStrengthIndicator(int32_t rssi) const;
 
  public:
-  explicit WifiSelectionActivity(GfxRenderer& renderer, InputManager& inputManager,
+  explicit WifiSelectionActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                                  const std::function<void(bool connected)>& onComplete)
-      : ActivityWithSubactivity("WifiSelection", renderer, inputManager), onComplete(onComplete) {}
+      : ActivityWithSubactivity("WifiSelection", renderer, mappedInput), onComplete(onComplete) {}
   void onEnter() override;
   void onExit() override;
   void loop() override;

src/activities/reader/EpubReaderActivity.cpp

@@ -106,12 +106,12 @@ void EpubReaderActivity::loop() {
   }
 
   // Enter chapter selection activity
-  if (inputManager.wasReleased(InputManager::BTN_CONFIRM)) {
+  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
     // Don't start activity transition while rendering
     xSemaphoreTake(renderingMutex, portMAX_DELAY);
     exitActivity();
     enterNewActivity(new EpubReaderChapterSelectionActivity(
-        this->renderer, this->inputManager, epub, currentSpineIndex,
+        this->renderer, this->mappedInput, epub, currentSpineIndex,
         [this] {
           exitActivity();
           updateRequired = true;
@@ -129,21 +129,21 @@ void EpubReaderActivity::loop() {
   }
 
   // Long press BACK (1s+) goes directly to home
-  if (inputManager.isPressed(InputManager::BTN_BACK) && inputManager.getHeldTime() >= goHomeMs) {
+  if (mappedInput.isPressed(MappedInputManager::Button::Back) && mappedInput.getHeldTime() >= goHomeMs) {
     onGoHome();
     return;
   }
 
   // Short press BACK goes to file selection
-  if (inputManager.wasReleased(InputManager::BTN_BACK) && inputManager.getHeldTime() < goHomeMs) {
+  if (mappedInput.wasReleased(MappedInputManager::Button::Back) && mappedInput.getHeldTime() < goHomeMs) {
     onGoBack();
     return;
   }
 
-  const bool prevReleased =
-      inputManager.wasReleased(InputManager::BTN_UP) || inputManager.wasReleased(InputManager::BTN_LEFT);
-  const bool nextReleased =
-      inputManager.wasReleased(InputManager::BTN_DOWN) || inputManager.wasReleased(InputManager::BTN_RIGHT);
+  const bool prevReleased = mappedInput.wasReleased(MappedInputManager::Button::PageBack) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Left);
+  const bool nextReleased = mappedInput.wasReleased(MappedInputManager::Button::PageForward) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Right);
 
   if (!prevReleased && !nextReleased) {
     return;
@@ -157,7 +157,7 @@ void EpubReaderActivity::loop() {
     return;
   }
 
-  const bool skipChapter = inputManager.getHeldTime() > skipChapterMs;
+  const bool skipChapter = mappedInput.getHeldTime() > skipChapterMs;
 
   if (skipChapter) {
     // We don't want to delete the section mid-render, so grab the semaphore
@@ -254,8 +254,8 @@ void EpubReaderActivity::renderScreen() {
     const auto viewportWidth = renderer.getScreenWidth() - orientedMarginLeft - orientedMarginRight;
     const auto viewportHeight = renderer.getScreenHeight() - orientedMarginTop - orientedMarginBottom;
 
-    if (!section->loadCacheMetadata(READER_FONT_ID, lineCompression, SETTINGS.extraParagraphSpacing, viewportWidth,
-                                    viewportHeight)) {
+    if (!section->loadSectionFile(READER_FONT_ID, lineCompression, SETTINGS.extraParagraphSpacing, viewportWidth,
+                                  viewportHeight)) {
       Serial.printf("[%lu] [ERS] Cache not found, building...\n", millis());
 
       // Progress bar dimensions
@@ -282,8 +282,6 @@ void EpubReaderActivity::renderScreen() {
         pagesUntilFullRefresh = 0;
       }
 
-      section->setupCacheDir();
-
       // Setup callback - only called for chapters >= 50KB, redraws with progress bar
       auto progressSetup = [this, boxXWithBar, boxWidthWithBar, boxHeightWithBar, barX, barY] {
         renderer.fillRect(boxXWithBar, boxY, boxWidthWithBar, boxHeightWithBar, false);
@@ -300,8 +298,8 @@ void EpubReaderActivity::renderScreen() {
         renderer.displayBuffer(EInkDisplay::FAST_REFRESH);
       };
 
-      if (!section->persistPageDataToSD(READER_FONT_ID, lineCompression, SETTINGS.extraParagraphSpacing, viewportWidth,
-                                        viewportHeight, progressSetup, progressCallback)) {
+      if (!section->createSectionFile(READER_FONT_ID, lineCompression, SETTINGS.extraParagraphSpacing, viewportWidth,
+                                      viewportHeight, progressSetup, progressCallback)) {
         Serial.printf("[%lu] [ERS] Failed to persist page data to SD\n", millis());
         section.reset();
         return;
@@ -336,7 +334,7 @@ void EpubReaderActivity::renderScreen() {
   }
 
   {
-    auto p = section->loadPageFromSD();
+    auto p = section->loadPageFromSectionFile();
     if (!p) {
       Serial.printf("[%lu] [ERS] Failed to load page from SD - clearing section cache\n", millis());
       section->clearCache();

src/activities/reader/EpubReaderActivity.h

@@ -27,9 +27,9 @@ class EpubReaderActivity final : public ActivityWithSubactivity {
   void renderStatusBar(int orientedMarginRight, int orientedMarginBottom, int orientedMarginLeft) const;
 
  public:
-  explicit EpubReaderActivity(GfxRenderer& renderer, InputManager& inputManager, std::unique_ptr<Epub> epub,
+  explicit EpubReaderActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, std::unique_ptr<Epub> epub,
                               const std::function<void()>& onGoBack, const std::function<void()>& onGoHome)
-      : ActivityWithSubactivity("EpubReader", renderer, inputManager),
+      : ActivityWithSubactivity("EpubReader", renderer, mappedInput),
         epub(std::move(epub)),
         onGoBack(onGoBack),
         onGoHome(onGoHome) {}

src/activities/reader/EpubReaderChapterSelectionActivity.cpp

@@ -66,17 +66,17 @@ void EpubReaderChapterSelectionActivity::onExit() {
 }
 
 void EpubReaderChapterSelectionActivity::loop() {
-  const bool prevReleased =
-      inputManager.wasReleased(InputManager::BTN_UP) || inputManager.wasReleased(InputManager::BTN_LEFT);
-  const bool nextReleased =
-      inputManager.wasReleased(InputManager::BTN_DOWN) || inputManager.wasReleased(InputManager::BTN_RIGHT);
+  const bool prevReleased = mappedInput.wasReleased(MappedInputManager::Button::Up) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Left);
+  const bool nextReleased = mappedInput.wasReleased(MappedInputManager::Button::Down) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Right);
 
-  const bool skipPage = inputManager.getHeldTime() > SKIP_PAGE_MS;
+  const bool skipPage = mappedInput.getHeldTime() > SKIP_PAGE_MS;
   const int pageItems = getPageItems();
 
-  if (inputManager.wasReleased(InputManager::BTN_CONFIRM)) {
+  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
     onSelectSpineIndex(selectorIndex);
-  } else if (inputManager.wasReleased(InputManager::BTN_BACK)) {
+  } else if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
     onGoBack();
   } else if (prevReleased) {
     if (skipPage) {

src/activities/reader/EpubReaderChapterSelectionActivity.h

@@ -27,11 +27,11 @@ class EpubReaderChapterSelectionActivity final : public Activity {
   void renderScreen();
 
  public:
-  explicit EpubReaderChapterSelectionActivity(GfxRenderer& renderer, InputManager& inputManager,
+  explicit EpubReaderChapterSelectionActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                                               const std::shared_ptr<Epub>& epub, const int currentSpineIndex,
                                               const std::function<void()>& onGoBack,
                                               const std::function<void(int newSpineIndex)>& onSelectSpineIndex)
-      : Activity("EpubReaderChapterSelection", renderer, inputManager),
+      : Activity("EpubReaderChapterSelection", renderer, mappedInput),
         epub(epub),
         currentSpineIndex(currentSpineIndex),
         onGoBack(onGoBack),

src/activities/reader/FileSelectionActivity.cpp

@@ -89,7 +89,7 @@ void FileSelectionActivity::onExit() {
 
 void FileSelectionActivity::loop() {
   // Long press BACK (1s+) goes to root folder
-  if (inputManager.isPressed(InputManager::BTN_BACK) && inputManager.getHeldTime() >= GO_HOME_MS) {
+  if (mappedInput.isPressed(MappedInputManager::Button::Back) && mappedInput.getHeldTime() >= GO_HOME_MS) {
     if (basepath != "/") {
       basepath = "/";
       loadFiles();
@@ -98,14 +98,14 @@ void FileSelectionActivity::loop() {
     return;
   }
 
-  const bool prevReleased =
-      inputManager.wasReleased(InputManager::BTN_UP) || inputManager.wasReleased(InputManager::BTN_LEFT);
-  const bool nextReleased =
-      inputManager.wasReleased(InputManager::BTN_DOWN) || inputManager.wasReleased(InputManager::BTN_RIGHT);
+  const bool prevReleased = mappedInput.wasReleased(MappedInputManager::Button::Up) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Left);
+  const bool nextReleased = mappedInput.wasReleased(MappedInputManager::Button::Down) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Right);
 
-  const bool skipPage = inputManager.getHeldTime() > SKIP_PAGE_MS;
+  const bool skipPage = mappedInput.getHeldTime() > SKIP_PAGE_MS;
 
-  if (inputManager.wasReleased(InputManager::BTN_CONFIRM)) {
+  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
     if (files.empty()) {
       return;
     }
@@ -118,9 +118,9 @@ void FileSelectionActivity::loop() {
     } else {
       onSelect(basepath + files[selectorIndex]);
     }
-  } else if (inputManager.wasReleased(InputManager::BTN_BACK)) {
+  } else if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
     // Short press: go up one directory, or go home if at root
-    if (inputManager.getHeldTime() < GO_HOME_MS) {
+    if (mappedInput.getHeldTime() < GO_HOME_MS) {
       if (basepath != "/") {
         basepath.replace(basepath.find_last_of('/'), std::string::npos, "");
         if (basepath.empty()) basepath = "/";
@@ -166,7 +166,8 @@ void FileSelectionActivity::render() const {
   renderer.drawCenteredText(READER_FONT_ID, 10, "Books", true, BOLD);
 
   // Help text
-  renderer.drawButtonHints(UI_FONT_ID, "« Home", "Open", "", "");
+  const auto labels = mappedInput.mapLabels("« Home", "Open", "", "");
+  renderer.drawButtonHints(UI_FONT_ID, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 
   if (files.empty()) {
     renderer.drawText(UI_FONT_ID, 20, 60, "No books found");

src/activities/reader/FileSelectionActivity.h

@@ -25,10 +25,10 @@ class FileSelectionActivity final : public Activity {
   void loadFiles();
 
  public:
-  explicit FileSelectionActivity(GfxRenderer& renderer, InputManager& inputManager,
+  explicit FileSelectionActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                                  const std::function<void(const std::string&)>& onSelect,
                                  const std::function<void()>& onGoHome, std::string initialPath = "/")
-      : Activity("FileSelection", renderer, inputManager),
+      : Activity("FileSelection", renderer, mappedInput),
         basepath(initialPath.empty() ? "/" : std::move(initialPath)),
         onSelect(onSelect),
         onGoHome(onGoHome) {}

src/activities/reader/ReaderActivity.cpp

@@ -61,7 +61,7 @@ std::unique_ptr<Xtc> ReaderActivity::loadXtc(const std::string& path) {
 void ReaderActivity::onSelectBookFile(const std::string& path) {
   currentBookPath = path;  // Track current book path
   exitActivity();
-  enterNewActivity(new FullScreenMessageActivity(renderer, inputManager, "Loading..."));
+  enterNewActivity(new FullScreenMessageActivity(renderer, mappedInput, "Loading..."));
 
   if (isXtcFile(path)) {
     // Load XTC file
@@ -70,7 +70,7 @@ void ReaderActivity::onSelectBookFile(const std::string& path) {
       onGoToXtcReader(std::move(xtc));
     } else {
       exitActivity();
-      enterNewActivity(new FullScreenMessageActivity(renderer, inputManager, "Failed to load XTC", REGULAR,
+      enterNewActivity(new FullScreenMessageActivity(renderer, mappedInput, "Failed to load XTC", REGULAR,
                                                      EInkDisplay::HALF_REFRESH));
       delay(2000);
       onGoToFileSelection();
@@ -82,7 +82,7 @@ void ReaderActivity::onSelectBookFile(const std::string& path) {
       onGoToEpubReader(std::move(epub));
     } else {
       exitActivity();
-      enterNewActivity(new FullScreenMessageActivity(renderer, inputManager, "Failed to load epub", REGULAR,
+      enterNewActivity(new FullScreenMessageActivity(renderer, mappedInput, "Failed to load epub", REGULAR,
                                                      EInkDisplay::HALF_REFRESH));
       delay(2000);
       onGoToFileSelection();
@@ -95,7 +95,7 @@ void ReaderActivity::onGoToFileSelection(const std::string& fromBookPath) {
   // If coming from a book, start in that book's folder; otherwise start from root
   const auto initialPath = fromBookPath.empty() ? "/" : extractFolderPath(fromBookPath);
   enterNewActivity(new FileSelectionActivity(
-      renderer, inputManager, [this](const std::string& path) { onSelectBookFile(path); }, onGoBack, initialPath));
+      renderer, mappedInput, [this](const std::string& path) { onSelectBookFile(path); }, onGoBack, initialPath));
 }
 
 void ReaderActivity::onGoToEpubReader(std::unique_ptr<Epub> epub) {
@@ -103,7 +103,7 @@ void ReaderActivity::onGoToEpubReader(std::unique_ptr<Epub> epub) {
   currentBookPath = epubPath;
   exitActivity();
   enterNewActivity(new EpubReaderActivity(
-      renderer, inputManager, std::move(epub), [this, epubPath] { onGoToFileSelection(epubPath); },
+      renderer, mappedInput, std::move(epub), [this, epubPath] { onGoToFileSelection(epubPath); },
       [this] { onGoBack(); }));
 }
 
@@ -112,7 +112,7 @@ void ReaderActivity::onGoToXtcReader(std::unique_ptr<Xtc> xtc) {
   currentBookPath = xtcPath;
   exitActivity();
   enterNewActivity(new XtcReaderActivity(
-      renderer, inputManager, std::move(xtc), [this, xtcPath] { onGoToFileSelection(xtcPath); },
+      renderer, mappedInput, std::move(xtc), [this, xtcPath] { onGoToFileSelection(xtcPath); },
       [this] { onGoBack(); }));
 }
 

src/activities/reader/ReaderActivity.h

@@ -21,9 +21,9 @@ class ReaderActivity final : public ActivityWithSubactivity {
   void onGoToXtcReader(std::unique_ptr<Xtc> xtc);
 
  public:
-  explicit ReaderActivity(GfxRenderer& renderer, InputManager& inputManager, std::string initialBookPath,
+  explicit ReaderActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, std::string initialBookPath,
                           const std::function<void()>& onGoBack)
-      : ActivityWithSubactivity("Reader", renderer, inputManager),
+      : ActivityWithSubactivity("Reader", renderer, mappedInput),
         initialBookPath(std::move(initialBookPath)),
         onGoBack(onGoBack) {}
   void onEnter() override;

src/activities/reader/XtcReaderActivity.cpp

@@ -71,21 +71,21 @@ void XtcReaderActivity::onExit() {
 
 void XtcReaderActivity::loop() {
   // Long press BACK (1s+) goes directly to home
-  if (inputManager.isPressed(InputManager::BTN_BACK) && inputManager.getHeldTime() >= goHomeMs) {
+  if (mappedInput.isPressed(MappedInputManager::Button::Back) && mappedInput.getHeldTime() >= goHomeMs) {
     onGoHome();
     return;
   }
 
   // Short press BACK goes to file selection
-  if (inputManager.wasReleased(InputManager::BTN_BACK) && inputManager.getHeldTime() < goHomeMs) {
+  if (mappedInput.wasReleased(MappedInputManager::Button::Back) && mappedInput.getHeldTime() < goHomeMs) {
     onGoBack();
     return;
   }
 
-  const bool prevReleased =
-      inputManager.wasReleased(InputManager::BTN_UP) || inputManager.wasReleased(InputManager::BTN_LEFT);
-  const bool nextReleased =
-      inputManager.wasReleased(InputManager::BTN_DOWN) || inputManager.wasReleased(InputManager::BTN_RIGHT);
+  const bool prevReleased = mappedInput.wasReleased(MappedInputManager::Button::PageBack) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Left);
+  const bool nextReleased = mappedInput.wasReleased(MappedInputManager::Button::PageForward) ||
+                            mappedInput.wasReleased(MappedInputManager::Button::Right);
 
   if (!prevReleased && !nextReleased) {
     return;
@@ -98,7 +98,7 @@ void XtcReaderActivity::loop() {
     return;
   }
 
-  const bool skipPages = inputManager.getHeldTime() > skipPageMs;
+  const bool skipPages = mappedInput.getHeldTime() > skipPageMs;
   const int skipAmount = skipPages ? 10 : 1;
 
   if (prevReleased) {

src/activities/reader/XtcReaderActivity.h

@@ -32,9 +32,9 @@ class XtcReaderActivity final : public Activity {
   void loadProgress();
 
  public:
-  explicit XtcReaderActivity(GfxRenderer& renderer, InputManager& inputManager, std::unique_ptr<Xtc> xtc,
+  explicit XtcReaderActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, std::unique_ptr<Xtc> xtc,
                              const std::function<void()>& onGoBack, const std::function<void()>& onGoHome)
-      : Activity("XtcReader", renderer, inputManager), xtc(std::move(xtc)), onGoBack(onGoBack), onGoHome(onGoHome) {}
+      : Activity("XtcReader", renderer, mappedInput), xtc(std::move(xtc)), onGoBack(onGoBack), onGoHome(onGoHome) {}
   void onEnter() override;
   void onExit() override;
   void loop() override;

src/activities/settings/OtaUpdateActivity.cpp

@@ -72,7 +72,7 @@ void OtaUpdateActivity::onEnter() {
 
   // Launch WiFi selection subactivity
   Serial.printf("[%lu] [OTA] Launching WifiSelectionActivity...\n", millis());
-  enterNewActivity(new WifiSelectionActivity(renderer, inputManager,
+  enterNewActivity(new WifiSelectionActivity(renderer, mappedInput,
                                              [this](const bool connected) { onWifiSelectionComplete(connected); }));
 }
 
@@ -191,7 +191,7 @@ void OtaUpdateActivity::loop() {
   }
 
   if (state == WAITING_CONFIRMATION) {
-    if (inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
       Serial.printf("[%lu] [OTA] New update available, starting download...\n", millis());
       xSemaphoreTake(renderingMutex, portMAX_DELAY);
       state = UPDATE_IN_PROGRESS;
@@ -215,7 +215,7 @@ void OtaUpdateActivity::loop() {
       updateRequired = true;
     }
 
-    if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
       goBack();
     }
 
@@ -223,14 +223,14 @@ void OtaUpdateActivity::loop() {
   }
 
   if (state == FAILED) {
-    if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
       goBack();
     }
     return;
   }
 
   if (state == NO_UPDATE) {
-    if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+    if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
       goBack();
     }
     return;

src/activities/settings/OtaUpdateActivity.h

@@ -35,8 +35,9 @@ class OtaUpdateActivity : public ActivityWithSubactivity {
   void render();
 
  public:
-  explicit OtaUpdateActivity(GfxRenderer& renderer, InputManager& inputManager, const std::function<void()>& goBack)
-      : ActivityWithSubactivity("OtaUpdate", renderer, inputManager), goBack(goBack), updater() {}
+  explicit OtaUpdateActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
+                             const std::function<void()>& goBack)
+      : ActivityWithSubactivity("OtaUpdate", renderer, mappedInput), goBack(goBack), updater() {}
   void onEnter() override;
   void onExit() override;
   void loop() override;

src/activities/settings/SettingsActivity.cpp

@@ -9,7 +9,7 @@
 
 // Define the static settings list
 namespace {
-constexpr int settingsCount = 6;
+constexpr int settingsCount = 7;
 const SettingInfo settingsList[settingsCount] = {
     // Should match with SLEEP_SCREEN_MODE
     {"Sleep Screen", SettingType::ENUM, &CrossPointSettings::sleepScreen, {"Dark", "Light", "Custom", "Cover"}},
@@ -20,6 +20,10 @@ const SettingInfo settingsList[settingsCount] = {
      SettingType::ENUM,
      &CrossPointSettings::orientation,
      {"Portrait", "Landscape CW", "Inverted", "Landscape CCW"}},
+    {"Front Button Layout",
+     SettingType::ENUM,
+     &CrossPointSettings::frontButtonLayout,
+     {"Bck, Cnfrm, Lft, Rght", "Lft, Rght, Bck, Cnfrm"}},
     {"Check for updates", SettingType::ACTION, nullptr, {}},
 };
 }  // namespace
@@ -68,24 +72,26 @@ void SettingsActivity::loop() {
   }
 
   // Handle actions with early return
-  if (inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
     toggleCurrentSetting();
     updateRequired = true;
     return;
   }
 
-  if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
     SETTINGS.saveToFile();
     onGoHome();
     return;
   }
 
   // Handle navigation
-  if (inputManager.wasPressed(InputManager::BTN_UP) || inputManager.wasPressed(InputManager::BTN_LEFT)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Up) ||
+      mappedInput.wasPressed(MappedInputManager::Button::Left)) {
     // Move selection up (with wrap-around)
     selectedSettingIndex = (selectedSettingIndex > 0) ? (selectedSettingIndex - 1) : (settingsCount - 1);
     updateRequired = true;
-  } else if (inputManager.wasPressed(InputManager::BTN_DOWN) || inputManager.wasPressed(InputManager::BTN_RIGHT)) {
+  } else if (mappedInput.wasPressed(MappedInputManager::Button::Down) ||
+             mappedInput.wasPressed(MappedInputManager::Button::Right)) {
     // Move selection down
     if (selectedSettingIndex < settingsCount - 1) {
       selectedSettingIndex++;
@@ -113,7 +119,7 @@ void SettingsActivity::toggleCurrentSetting() {
     if (std::string(setting.name) == "Check for updates") {
       xSemaphoreTake(renderingMutex, portMAX_DELAY);
       exitActivity();
-      enterNewActivity(new OtaUpdateActivity(renderer, inputManager, [this] {
+      enterNewActivity(new OtaUpdateActivity(renderer, mappedInput, [this] {
         exitActivity();
         updateRequired = true;
       }));
@@ -173,10 +179,13 @@ void SettingsActivity::render() const {
     }
   }
 
-  // Draw help text
-  renderer.drawButtonHints(UI_FONT_ID, "« Save", "Toggle", "", "");
+  // Draw version text above button hints
   renderer.drawText(SMALL_FONT_ID, pageWidth - 20 - renderer.getTextWidth(SMALL_FONT_ID, CROSSPOINT_VERSION),
-                    pageHeight - 30, CROSSPOINT_VERSION);
+                    pageHeight - 60, CROSSPOINT_VERSION);
+
+  // Draw help text
+  const auto labels = mappedInput.mapLabels("« Save", "Toggle", "", "");
+  renderer.drawButtonHints(UI_FONT_ID, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 
   // Always use standard refresh for settings screen
   renderer.displayBuffer();

src/activities/settings/SettingsActivity.h

@@ -34,8 +34,9 @@ class SettingsActivity final : public ActivityWithSubactivity {
   void toggleCurrentSetting();
 
  public:
-  explicit SettingsActivity(GfxRenderer& renderer, InputManager& inputManager, const std::function<void()>& onGoHome)
-      : ActivityWithSubactivity("Settings", renderer, inputManager), onGoHome(onGoHome) {}
+  explicit SettingsActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
+                            const std::function<void()>& onGoHome)
+      : ActivityWithSubactivity("Settings", renderer, mappedInput), onGoHome(onGoHome) {}
   void onEnter() override;
   void onExit() override;
   void loop() override;

src/activities/util/FullScreenMessageActivity.h

@@ -13,10 +13,10 @@ class FullScreenMessageActivity final : public Activity {
   EInkDisplay::RefreshMode refreshMode;
 
  public:
-  explicit FullScreenMessageActivity(GfxRenderer& renderer, InputManager& inputManager, std::string text,
+  explicit FullScreenMessageActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, std::string text,
                                      const EpdFontStyle style = REGULAR,
                                      const EInkDisplay::RefreshMode refreshMode = EInkDisplay::FAST_REFRESH)
-      : Activity("FullScreenMessage", renderer, inputManager),
+      : Activity("FullScreenMessage", renderer, mappedInput),
         text(std::move(text)),
         style(style),
         refreshMode(refreshMode) {}

src/activities/util/KeyboardEntryActivity.cpp

@@ -138,7 +138,7 @@ void KeyboardEntryActivity::handleKeyPress() {
 
 void KeyboardEntryActivity::loop() {
   // Navigation
-  if (inputManager.wasPressed(InputManager::BTN_UP)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Up)) {
     if (selectedRow > 0) {
       selectedRow--;
       // Clamp column to valid range for new row
@@ -148,7 +148,7 @@ void KeyboardEntryActivity::loop() {
     updateRequired = true;
   }
 
-  if (inputManager.wasPressed(InputManager::BTN_DOWN)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Down)) {
     if (selectedRow < NUM_ROWS - 1) {
       selectedRow++;
       const int maxCol = getRowLength(selectedRow) - 1;
@@ -157,7 +157,7 @@ void KeyboardEntryActivity::loop() {
     updateRequired = true;
   }
 
-  if (inputManager.wasPressed(InputManager::BTN_LEFT)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Left)) {
     // Special bottom row case
     if (selectedRow == SPECIAL_ROW) {
       // Bottom row has special key widths
@@ -187,7 +187,7 @@ void KeyboardEntryActivity::loop() {
     updateRequired = true;
   }
 
-  if (inputManager.wasPressed(InputManager::BTN_RIGHT)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Right)) {
     const int maxCol = getRowLength(selectedRow) - 1;
 
     // Special bottom row case
@@ -220,13 +220,13 @@ void KeyboardEntryActivity::loop() {
   }
 
   // Selection
-  if (inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
     handleKeyPress();
     updateRequired = true;
   }
 
   // Cancel
-  if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
     if (onCancel) {
       onCancel();
     }

src/activities/util/KeyboardEntryActivity.h

@@ -1,6 +1,5 @@
 #pragma once
 #include <GfxRenderer.h>
-#include <InputManager.h>
 #include <freertos/FreeRTOS.h>
 #include <freertos/semphr.h>
 #include <freertos/task.h>
@@ -31,7 +30,7 @@ class KeyboardEntryActivity : public Activity {
   /**
    * Constructor
    * @param renderer Reference to the GfxRenderer for drawing
-   * @param inputManager Reference to InputManager for handling input
+   * @param mappedInput Reference to MappedInputManager for handling input
    * @param title Title to display above the keyboard
    * @param initialText Initial text to show in the input field
    * @param startY Y position to start rendering the keyboard
@@ -40,11 +39,11 @@ class KeyboardEntryActivity : public Activity {
    * @param onComplete Callback invoked when input is complete
    * @param onCancel Callback invoked when input is cancelled
    */
-  explicit KeyboardEntryActivity(GfxRenderer& renderer, InputManager& inputManager, std::string title = "Enter Text",
-                                 std::string initialText = "", const int startY = 10, const size_t maxLength = 0,
-                                 const bool isPassword = false, OnCompleteCallback onComplete = nullptr,
-                                 OnCancelCallback onCancel = nullptr)
-      : Activity("KeyboardEntry", renderer, inputManager),
+  explicit KeyboardEntryActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
+                                 std::string title = "Enter Text", std::string initialText = "", const int startY = 10,
+                                 const size_t maxLength = 0, const bool isPassword = false,
+                                 OnCompleteCallback onComplete = nullptr, OnCancelCallback onCancel = nullptr)
+      : Activity("KeyboardEntry", renderer, mappedInput),
         title(std::move(title)),
         text(std::move(initialText)),
         startY(startY),

src/main.cpp

@@ -16,6 +16,7 @@
 #include "Battery.h"
 #include "CrossPointSettings.h"
 #include "CrossPointState.h"
+#include "MappedInputManager.h"
 #include "activities/boot_sleep/BootActivity.h"
 #include "activities/boot_sleep/SleepActivity.h"
 #include "activities/home/HomeActivity.h"
@@ -41,6 +42,7 @@
 
 EInkDisplay einkDisplay(EPD_SCLK, EPD_MOSI, EPD_CS, EPD_DC, EPD_RST, EPD_BUSY);
 InputManager inputManager;
+MappedInputManager mappedInputManager(inputManager);
 GfxRenderer renderer(einkDisplay);
 Activity* currentActivity;
 
@@ -124,7 +126,7 @@ void waitForPowerRelease() {
 // Enter deep sleep mode
 void enterDeepSleep() {
   exitActivity();
-  enterNewActivity(new SleepActivity(renderer, inputManager));
+  enterNewActivity(new SleepActivity(renderer, mappedInputManager));
 
   einkDisplay.deepSleep();
   Serial.printf("[%lu] [   ] Power button press calibration value: %lu ms\n", millis(), t2 - t1);
@@ -139,24 +141,24 @@ void enterDeepSleep() {
 void onGoHome();
 void onGoToReader(const std::string& initialEpubPath) {
   exitActivity();
-  enterNewActivity(new ReaderActivity(renderer, inputManager, initialEpubPath, onGoHome));
+  enterNewActivity(new ReaderActivity(renderer, mappedInputManager, initialEpubPath, onGoHome));
 }
 void onGoToReaderHome() { onGoToReader(std::string()); }
 void onContinueReading() { onGoToReader(APP_STATE.openEpubPath); }
 
 void onGoToFileTransfer() {
   exitActivity();
-  enterNewActivity(new CrossPointWebServerActivity(renderer, inputManager, onGoHome));
+  enterNewActivity(new CrossPointWebServerActivity(renderer, mappedInputManager, onGoHome));
 }
 
 void onGoToSettings() {
   exitActivity();
-  enterNewActivity(new SettingsActivity(renderer, inputManager, onGoHome));
+  enterNewActivity(new SettingsActivity(renderer, mappedInputManager, onGoHome));
 }
 
 void onGoHome() {
   exitActivity();
-  enterNewActivity(new HomeActivity(renderer, inputManager, onContinueReading, onGoToReaderHome, onGoToSettings,
+  enterNewActivity(new HomeActivity(renderer, mappedInputManager, onContinueReading, onGoToReaderHome, onGoToSettings,
                                     onGoToFileTransfer));
 }
 
@@ -193,7 +195,7 @@ void setup() {
     Serial.printf("[%lu] [   ] SD card initialization failed\n", millis());
     setupDisplayAndFonts();
     exitActivity();
-    enterNewActivity(new FullScreenMessageActivity(renderer, inputManager, "SD card error", BOLD));
+    enterNewActivity(new FullScreenMessageActivity(renderer, mappedInputManager, "SD card error", BOLD));
     return;
   }
 
@@ -205,7 +207,7 @@ void setup() {
   setupDisplayAndFonts();
 
   exitActivity();
-  enterNewActivity(new BootActivity(renderer, inputManager));
+  enterNewActivity(new BootActivity(renderer, mappedInputManager));
 
   APP_STATE.loadFromFile();
   if (APP_STATE.openEpubPath.empty()) {