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D4 - Design

System Architecture​

Architect: Danylo

The system is designed as a modular event-driven architecture.

Core Modules​

  1. Kernel/Main Loop: Handles task scheduling and watchdog.
  2. Hardware Abstraction Layer (HAL): Interfaces with ESP32 peripherals (UART, SPI, GPIO).
  3. Managers:
    • DisplayManager: Controls the TFT screen updates.
    • BluetoothManager: Handles BLE connections and GATT services.
    • MenuSystem: Manages UI navigation and state.
  4. Drivers: Specific implementations for ST7735 displays, SD cards, etc.

Data Flow​

Data flows from the UART ISR (Interrupt Service Routine) into a circular buffer. The CommTester or BridgeMode tasks consume this buffer and route data to:

  • USB CDC (for PC connection).
  • Display (for visualization).
  • SD Card (for logging).

UI/UX Design​

The user interface is designed for navigation with a simple rotary encoder or 3-button setup (Up, Down, Select), ensuring usability even with gloves or in tight spaces.