Add 2x2 Grid layout with icons and B612Mono fonts

.cproject

@@ -14,7 +14,7 @@
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@@ -241,4 +241,4 @@
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.gitignore

@@ -16,4 +16,11 @@ Deploy/Firmware_To_Deploy/*
 *.launch
 
 # Test build products
-Tests/*.exe
+Tests/*.exe
+
+# OS artifacts
+.DS_Store
+
+# Python
+__pycache__/
+*.pyc

CLAUDE.md

@@ -0,0 +1,94 @@
+# FlySight 2 Firmware
+
+## Project Overview
+
+FlySight 2 is a high-precision GPS data logger for skydiving and BASE jumping by Bionic Avionics Inc. The firmware runs on an STM32WB5MMGHx dual-core MCU (Cortex-M4 application + Cortex-M0+ BLE radio). It provides real-time audio feedback during freefall, multi-sensor data logging, BLE connectivity, USB mass storage, and an ActiveLook HUD display on Engo smart glasses.
+
+### Key Features
+- GNSS/GPS tracking at up to 25 Hz (u-blox MAX-M8)
+- 6-axis IMU (LSM6DSO), barometer, magnetometer, humidity sensor
+- Real-time audio tone/speech feedback based on flight parameters
+- Data logging to SD card via FatFS
+- BLE connectivity (STM32 WPAN stack) for phone app and ActiveLook glasses
+- USB mass storage for file transfer
+- ActiveLook HUD display: 2x2 grid layout with icons, B612 aviation font
+
+### Build System
+- **IDE**: STM32CubeIDE (Eclipse-based, ARM GCC toolchain)
+- **MCU**: STM32WB5MMGHx (dual-core M4+M0+, BLE 5.x)
+- **No Makefile/CMake** -- build is defined in `.cproject`/`.project` files
+- **Pre-build**: `prebuild.sh` generates `version.h` from git tag
+- **Post-build**: generates `UserApp.bin` and copies to `Deploy/Firmware_As_Built/`
+
+### Branch Structure
+- `master` -- stable releases
+- `develop` -- active development (ActiveLook integration, new features)
+
+## Rules for Claude Code
+
+### Language Server Protocol (LSP)
+- **ALWAYS use LSP** (documentSymbol, hover, goToDefinition, findReferences, callHierarchy) when analyzing or reading C/C++ source files
+- Prefer LSP over Read tool or grep for understanding code structure
+- Only fall back to Read for non-code files (configs, scripts, docs) or when LSP can't resolve symbols due to missing STM32 HAL headers
+- Use LSP for Python files as well when available
+
+### ActiveLook Development
+- **ALWAYS consult the ActiveLook API documentation** before any implementation: https://github.com/ActiveLook/Activelook-API-Documentation/blob/main/ActiveLook_API.md
+- **Never guess coordinates or protocol details** -- read the documentation first
+- ActiveLook display coordinate system: (0,0) = bottom-right visually (optical mirror flips both axes)
+  - High X = visually LEFT, Low X = visually RIGHT
+  - High Y = visually TOP, Low Y = visually BOTTOM
+  - Rotation 4 = normal readable text with centered anchor
+- Page coordinates are NOT mirrored (standard: x=0 left, higher y = higher on screen)
+- Layout-internal coordinates (extra sub-commands) ARE mirrored
+- Images must be rotated 180 degrees before upload to compensate for optical mirror
+- Config names use NUL-terminated strings (NOT padded to 12 bytes) when used with Config-Generator, but FlySight firmware pads to 12 bytes
+- `cfgWrite` requires the correct password if config already exists (FlySight uses password `0x01020304`)
+- `cfgSet` must be called to activate a config before its fonts/images are available
+- Font upload uses `fontSave` with header `[id, size_hi, size_lo]` then data chunks
+- Image upload uses `imgSave` with header `[id, size_u32, width_u16, format]` then data chunks
+- Maximum BLE write payload = MTU - 3 (currently 253 bytes with MTU=256)
+- Reference the ActiveLook Visual Assets for pre-loaded icons: https://github.com/ActiveLook/Activelook-Visual-Assets
+- Reference the ActiveLook Config-Generator for font/image conversion: https://github.com/ActiveLook/Config-Generator
+
+### STM32/Embedded Best Practices
+- Follow existing code patterns -- the project uses STM32 HAL, WPAN middleware, and a cooperative scheduler (UTIL_SEQ), not FreeRTOS
+- One BLE command per scheduler task invocation -- never send multiple BLE writes in a tight loop
+- Use `UTIL_SEQ_SetTask()` to schedule the next step, not blocking delays
+- Respect the watchdog timer (IWDG, 3-second timeout)
+- All sensor I/O is DMA-based and interrupt-driven -- never block in ISR context
+- Stack is limited (0x400 bytes) -- avoid large local arrays; use static buffers
+- Flash is limited to 454 KB for the application (bootloader occupies lower flash)
+- RAM1 is 256 KB, RAM_SHARED is 10 KB (BLE radio)
+- Use `static` for file-scope variables and functions
+- The project uses `newlib-nano` with float printf enabled (`-u _printf_float`)
+
+### C Language Style
+- Follow existing project conventions (Bionic Avionics coding style)
+- Prefix all public functions with `FS_` (FlySight namespace)
+- Use `typedef enum` and `typedef struct` with `_t` suffix
+- State machines use function pointer tables (see `mode.c`, `crs.c`, `activelook.c`)
+- Ring buffers for producer/consumer patterns (see `log.c`, `sensor.c`)
+- No dynamic memory allocation (`malloc`/`free`) -- use static arrays
+- Error handling: log events via `FS_Log_WriteEvent()`, set LED color for health status
+- Configuration is file-based (text config on SD card, parsed at startup)
+
+### Code Quality
+- Do not add unnecessary comments -- the code should be self-documenting
+- Do not add features beyond what was requested
+- Do not guess at protocol details -- verify against documentation or test empirically
+- When modifying ActiveLook layout code, make one change at a time and test
+- The clangd LSP will show false errors for STM32 HAL symbols (can't resolve `main.h`) -- these are expected and don't affect the actual STM32CubeIDE build
+
+### Deployment
+- Build with STM32CubeIDE (Debug or Release configuration)
+- Deploy via encrypted `.sfb` firmware update files (see `Deploy/deploy_firmware.py`)
+- Each device batch has a specific public key -- check `flysight.txt` on device for `Pubkey_X`
+- ActiveLook config (fonts/images) uploaded separately via `Config-Generator/upload_ble.py`
+
+### Key Directories
+- `FlySight/` -- main application code (sensors, audio, logging, modes, ActiveLook)
+- `Core/Src/` -- STM32 HAL initialization, main loop, interrupt handlers
+- `STM32_WPAN/App/` -- BLE application layer (app_ble.c, custom services, ActiveLook client)
+- `Deploy/` -- firmware deployment scripts and tools
+- `Config-Generator/` (external, at `~/Projects/Config-Generator/`) -- ActiveLook font/image preparation tool