A well-structured firmware layering approach keeps maintenance costs low during feature iterations and model extensions.
If firmware code is tightly coupled to specific hardware, any new model variant requires extensive modifications. The purpose of a layered architecture is to isolate components with different change frequencies.
Common layering divides the system into the Driver, Service, and Application layers. The Driver layer encapsulates register and peripheral operations, the Service layer handles communication protocols and state management, and the Application layer processes only business logic.
With this architecture, changing the main controller model primarily affects the driver layer, adding communication protocols focuses on the service layer, and customer-specific features fall within the application layer. This ensures clear and controlled scope of changes.
Supporting engineering practices include unified error code definitions, logging for critical workflows, and reusable test cases. These directly impact long-term project maintainability.
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