Battery + Charger Summary

In this section, we built a complete Battery + Charger component set, validating their interactions in a functioning Battery Subsystem through both unit and integration tests.

What We Did

In the process, we established key patterns that will carry forward into similar subsystems:

• Component Architecture

  • Explored the roles of the Component, HAL layer, Device, and Controller.
  • Used Generic Types to enable dependency injection and flexible implementation choices.
  • Registered the Device to introduce a new subsystem into the runtime.

• Event-Driven Behavior

  • Defined and handled BatteryEvent messages via the Controller to enact behavior.

• Asynchronous Integration

  • Adapted async tasks using embassy::executor and #[embassy_executor::task] to run under both std (for development and testing) and embedded (no-std) environments.

• Testing Support

  • Implemented comprehensive unit tests for the Battery and Charger subsystems.
  • Added integration tests to verify runtime behavior across components.

What We Omitted (For Simplicity)

This exercise focused on illustrating patterns -— not delivering production-grade code. Accordingly:

• We did not fully implement the Smart Battery specification.
  Features such as removable batteries, dynamic BatteryMode handling, or full status reporting were omitted for simplicity.

• Our simulations of battery behavior and charger policy were intentionally lightweight.
  The goal was to simulate dynamic behavior, not to mirror real-world electrical characteristics.

• Error handling was minimal.
  A real embedded system would avoid panic!() in favor of structured error recovery and system notification. Here, we favored visibility and simplicity.

These trade-offs allowed us to focus on demonstrating patterns and validate essential integration behavior.