Product Software Block Diagram

This diagram illustrates the firmware architecture of a mechanical keyboard, organized by functional logic into horizontal software layers and vertical support systems. The horizontal layers, arranged from bottom to top, comprise the hardware platform (MCU, keyboard matrix, etc.), the hardware abstraction layer (drivers for GPIO, USB, SPI/I2C, etc.), the driver layer (matrix scanning, debouncing, USB protocol, PWM backlighting, etc.), and the application layer (mode management, backlight control, self-test diagnostics, etc.), with user-facing application service interfaces at the very top. Flanking these on both sides are support modules—such as firmware asset management, debugging and diagnostics (UART logging, command parsing), and firmware updates (OTA, bootloader management)—creating a complete, modular, and maintainable embedded software system.