9b3885135f
## Summary Adds Xteink X3 hardware support to CrossPoint Reader. The X3 uses the same SSD1677 e-ink controller as the X4 but with a different panel (792x528 vs 800x480), different button layout, and an I2C fuel gauge (BQ27220) instead of ADC-based battery reading. All X3-specific behavior is gated by runtime device detection — X4 behavior is unchanged. Depends on community-sdk X3 support: open-x4-epaper/community-sdk#19 (merged). ## Changes ### HAL Layer **HalGPIO** (`lib/hal/HalGPIO.cpp/.h`) - I2C-based device fingerprinting at boot: probes for BQ27220 fuel gauge, DS3231 RTC, and QMI8658 IMU to distinguish X3 from X4 - Detection result cached in NVS for fast subsequent boots - Exposes `deviceIsX3()` / `deviceIsX4()` helpers used throughout the codebase - X3 button mapping (7 GPIOs vs X4's layout) - USB connection detection and wake classification for X3 **HalDisplay** (`lib/hal/HalDisplay.cpp/.h`) - Calls `einkDisplay.setDisplayX3()` before init when X3 is detected - Requests display resync after power button / flash wake events - Runtime display dimension accessors (`getDisplayWidth()`, `getDisplayHeight()`, `getBufferSize()`) - Exposed as global `display` instance for use by image converters **HalPowerManager** (`lib/hal/HalPowerManager.cpp/.h`) - X3 battery reading via I2C fuel gauge (BQ27220 at 0x55, SOC register) - X3 power button uses GPIO hold for deep sleep ### Display & Rendering **GfxRenderer** (`lib/GfxRenderer/GfxRenderer.cpp/.h`) - Buffer size and display dimensions are now runtime values (not compile-time constants) to support both panel sizes - X3 anti-aliasing tuning: only the darker grayscale level is applied to avoid washed-out text on the X3 panel. X4 retains both levels via `deviceIsX4()` gate **Image Converters** (`lib/JpegToBmpConverter`, `lib/PngToBmpConverter`) - Cover image prescale target uses runtime display dimensions from HAL instead of hardcoded 800x480 ### UI Themes **BaseTheme / LyraTheme** (`src/components/themes/`) - X3 button position mapping for the different physical layout - Adjusted UI element positioning for 792x528 viewport ### Boot & Init **main.cpp** - X3 hardware detection logging - Adjusted init sequence for X3 (no `HalSystem::begin()` dependency on X3 path) **HomeActivity** - Uses runtime `renderer.getBufferSize()` instead of static `GfxRenderer::getBufferSize()` FYI I did not add support for the gyro page turner. That can be it's own PR.
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