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FlipChanger Development Progress

This document tracks the development progress of the FlipChanger project.

Last Updated: February 10, 2025

Overall Status

Current Phase: On-device testing gate (v1.2.0)
Build Status: ✅ Successful
Device Testing: ⏳ Pending – v1.2.0 deployed; physical testing required
Memory Status: ✅ Optimized (SD card caching)
Stability: ✅ Stable (critical crashes fixed)

Phase gate: Code complete for v1.2.0. TESTING_CHECKLIST.md updated. On-device testing by contributors needed before next submission steps.

Completed Tasks

✅ Phase 1: Project Setup (Complete)

  • GitHub repository created
  • Product vision document
  • Development setup research
  • Initial documentation

✅ Phase 2: Development Environment (Complete)

  • uFBT (Micro Flipper Build Tool) installed
  • SDK downloaded and configured (v1.4.3)
  • Build system verified
  • Hello World test app created and deployed

✅ Phase 3: Core Application Structure (Complete)

  • Application manifest (application.fam)
  • Header file with type definitions (flipchanger.h)
  • Main application source (flipchanger.c)
  • Project structure and build configuration

✅ Phase 4: Basic UI and Navigation (Complete)

  • Main menu with 5 options (including Help)
  • Slot browser (supports 1-200 slots)
  • Slot details view
  • Full navigation system (UP/DOWN/OK/BACK)
  • Empty slot detection
  • UI overlap issues fixed

✅ Phase 5: Memory Optimization (Complete)

  • Reduced stack size from 4096 to 3072 bytes
  • Reduced JSON buffer from 4KB to 2KB (fits in stack)
  • Implemented SD card-based caching system
  • Only 10 slots cached in RAM at a time
  • Support for up to 200 slots (stored on SD card)
  • App no longer crashes due to memory issues

✅ Phase 6: Data Storage (Complete)

  • Storage API integration
  • JSON file reading from SD card
  • JSON file writing to SD card
  • Load slots from SD card on startup
  • Save slots to SD card on changes
  • Custom JSON parser/generator (lightweight, no external libs)
  • Error handling for missing/corrupted files
  • Data persistence verified

✅ Phase 7: Add/Edit Interface (Complete - Basic)

  • Text input for artist, album, genre, notes
  • Year entry (numeric input)
  • Character-by-character input system
  • Field navigation (UP/DOWN between fields)
  • Cursor movement (LEFT/RIGHT)
  • Character selection (UP/DOWN to change character)
  • Save functionality
  • Form validation and safety checks
  • UI overlap fixed

✅ Phase 8: Track Management (Complete - Basic)

  • Track list display in Add/Edit view
  • Track management view
  • Add new track
  • Delete track
  • Track count display
  • Safety checks and bounds validation

✅ Phase 9: Critical Bug Fixes (Complete)

  • Fixed NULL pointer dereference crashes
  • Fixed character input bug (can only add 'A')
  • Fixed cursor LEFT/RIGHT movement
  • Fixed Year field input
  • Fixed UI overlap (footer covering menu items)
  • Fixed exit crash (proper cleanup sequence)
  • Fixed launch crash (stack overflow - buffer size)
  • Comprehensive safety checks added

✅ Phase 10: Track Editing (Complete)

  • Track title editing with character input
  • Track duration editing (numeric only, seconds)
  • Field switching (LEFT/RIGHT or BACK at start/end)
  • Character input for track titles
  • Numeric input for track duration (0-9)
  • DEL character option in character selector
  • Long press BACK to exit track editing
  • Proper field navigation and cursor management

✅ Phase 11: UI/UX Improvements (Complete)

  • Scrollable slot details view (shows 4 items at a time)
  • Settings menu stub (VIEW_SETTINGS added)
  • Statistics menu stub (VIEW_STATISTICS added)
  • Year field fixed (numbers only, proper navigation)
  • Long press BACK support throughout app
  • Improved field navigation in Add/Edit view

✅ Phase 11.5: v1.0.2 Testing Fixes (Jan 2025)

  • Help menu – Footers removed; instructions in Help (Main menu + R key in Slot list, Details, Settings, Statistics)
  • Slot list wrap-around – Down at last slot → first; Up at first slot → last
  • Long press Up/Down – Skip by 10 slots for faster navigation
  • Save fix – Track title/duration now parsed and persisted on load (was saving blanks)
  • Custom app icon – User-created 10x10 PNG icon integrated

✅ Phase 11.6: Full-Screen Layout & Scroll Fix (Feb 2025)

  • Full-screen menus – Footers removed; recaptured screen space for content
  • Slot list – 5 slots visible (was 4); compact headers
  • Slot details – 4 fields visible (was 3)
  • Add/Edit – 4 fields visible (was 3)
  • Track management – 5 tracks visible (4 when editing)
  • Wrap-around scroll – Screen scrolls to show selection when wrapping (Up at slot 1→100, Down at 100→1)
  • Long-press Up/Down – Skip by 10 slots (verified working with wrap-around)

✅ Phase 11.7: Multi-Changer & Splash Screen (Feb 2025 – Complete)

  • Multi-Changer support – Changers: Name, Location, Total Slots; each has own slots DB
  • Changer registry – flipchanger_changers.json; per-Changer flipchanger_<id>.json
  • Changer select – Top-level Changer list; header shows Changer name; main menu scrollable (5 visible)
  • Changer admin – Add, Edit, Delete Changer; block delete if last; long-press OK to edit
  • Persistence – Save/load last_used_id on exit/start
  • Migration – One-time from single flipchanger_data.json to Changer model
  • Splash screen – Brief FlipChanger logo on launch (~1.2s or key to skip)
  • First-run – Create default Changer when none exist

See CHANGERS_DESIGN.md for architecture.

Bug fixes: Main menu scroll (Help was cut off); MemMange/BusFault when backing/selecting Changer (deferred load/save, static buffer).

In Progress / Needs Improvement

🚧 Phase 7: Add/Edit Interface (Polish Needed)

  • Field display scrolling for long text (implemented)
  • Better field navigation (improved with dual-mode input)
  • Pop-out views for full-screen field editing (future enhancement)
  • Track editing (title/duration) - ✅ COMPLETE

🚧 Phase 8: Track Management (Polish Needed)

  • Track editing (title and duration entry) - ✅ COMPLETE
  • Improved button actions (LEFT/RIGHT for add/delete could be clearer)
  • Better track list display (improved)

Planned Features

✅ Phase 12: Enhanced Fields (Complete)

  • Add "Disc Number" field (0=unset, 1–999)
  • Add "Album Artist" field (for compilations/DJ sets)
  • JSON load/save; Add/Edit form; Slot details display

📋 Phase 13: Settings Menu (Partial)

  • Settings menu view
  • Slot count configuration (3-200)
  • Save/load settings to JSON
  • Load settings on startup (uses saved file)
  • Slot count editing with OK to edit

📋 Phase 14: Statistics View (Partial)

  • Statistics view
  • Total albums count (from cached slots)
  • Total tracks count
  • Total play time (hours:minutes:seconds)
  • CDs by artist/genre breakdown (future)
  • Empty slots count (future)

📋 Phase 15: IR Integration (Future)

  • Research IR database API
  • Find CD changer remote codes
  • Implement IR control commands
  • Test with actual CD changer

📋 Phase 16: Polish and Testing

  • Comprehensive error handling
  • Input validation improvements
  • UI/UX improvements
  • Performance optimization
  • Full device testing
  • Documentation completion

📋 Phase 17: App Store Submission

  • Compliance review
  • Final testing
  • Submission to Flipper Apps Catalog
  • Community feedback

Technical Achievements

Memory Optimization

  • Problem: Initial implementation allocated 200 slots × ~850 bytes = ~170KB in RAM
  • Solution: Implemented caching system with only 10 slots in RAM (~8.5KB)
  • Result: App runs successfully without crashes
  • Stack Optimization: Reduced buffer sizes (4KB→2KB) to prevent stack overflow

Build System

  • Tool: uFBT (Micro Flipper Build Tool)
  • Status: ✅ Installed and working
  • SDK Version: 1.4.3 (release channel)
  • Target: 7, API: 87.1
  • Build Time: ~2-3 seconds
  • Deployment: Via USB (57-115 KB/s transfer rate)

Code Quality

  • Lines of Code: ~3000 (main application)
  • Compilation: ✅ No warnings/errors
  • Memory Safety: ✅ Comprehensive bounds checking and validation
  • Error Handling: Robust (extensive safety checks added)
  • UI/UX: ✅ Full-screen layout, Help menu, wrap-around scroll, long press support

Stability Improvements

  • Crash Fixes: Multiple critical crashes resolved
  • NULL Pointer Protection: Extensive validation added
  • Stack Overflow Prevention: Buffer size optimization
  • Clean Exit: Proper cleanup sequence implemented

Current Statistics

Metric Value
Total Slots Supported 200
Slots Cached in RAM 10
Default Slots 20 (configurable)
Max Tracks per CD 20 (memory optimized)
Stack Size 3072 bytes
JSON Buffer Size 2048 bytes
Build Success Rate 100%
Device Compatibility Flipper Zero (all versions with API 87.1+)

Known Issues / TODO

  1. Settings Menu: Slot count config working; load on startup uses saved file
  2. Statistics View: Albums/tracks/time from cached slots; artist/genre breakdown future
  3. Pop-out Views: Could add full-screen field editing views for better usability (future enhancement)
  4. Track Management: Button actions (LEFT/RIGHT for add/delete) could be clearer

Next Steps (Priority Order)

  1. Test Current Build (Immediate)

    • Verify Phase 12 fields (Disc Number, Album Artist) in Add/Edit and Slot details
    • Test full-screen layout, Help menu, wrap-around scroll
    • Test Settings/Statistics, long press BACK and skip by 10

  2. Settings / Statistics (High Priority)

    • Slot count configuration (3-200)
    • Save/load settings to JSON
    • Settings persistence

  3. Implement Statistics View (High Priority)

    • Calculate total CDs count
    • Calculate CDs by artist/genre
    • Display collection statistics

  4. Polish & Testing (Quality)

    • Comprehensive testing
    • User documentation
    • Code comments
    • App icon: ✅ Done

Lessons Learned

  1. Memory Constraints: Flipper Zero has ~64KB RAM - need careful memory management
  2. SD Card Storage: Essential for apps with large datasets
  3. Caching Strategy: Cache only visible/active data in RAM
  4. Build Tools: uFBT makes development much easier than full firmware build
  5. Testing: Always test on actual hardware - memory issues don't show in build
  6. Safety First: Extensive bounds checking prevents crashes - always validate inputs
  7. Stack Overflow: Large buffers on stack can cause crashes - use heap or smaller buffers

Development Speed: Excellent progress - core features implemented! App is functional and stable.