stm32f4-tdd

Host-based STM32F4 firmware unit tests run on a PC by using Unity and FFF to mock HAL functions, allowing application logic validation without physical MCU hardware. This approach executes test cases directly on the host machine.

HAL mocking in embedded firmware testing uses the Fake Function Framework to replace hardware abstraction layer functions with fake implementations, removing hardware dependencies to validate application logic, state machines, and protocol parsers quickly.

You do not need real STM32F4 hardware to validate state machines and protocol parsers. By using Unity and FFF to create a minimal HAL fake layer, host-based tests execute these components entirely on a PC.

Apply Red-Green-Refactor TDD cycles to STM32F4 drivers by defining a host-based test structure with Unity and FFF, writing tests for driver logic, running them on a PC, and refactoring safely with immediate feedback from the test runner.

You can use Unity and FFF to test STM32F4 application logic on a host machine. This combination provides a test harness that mocks HAL dependencies, enabling fast execution of realistic test scenarios without flashing firmware.

Host-based testing for STM32F4 firmware cannot validate real hardware timing, interrupt behavior, or peripheral electrical characteristics. It is limited to testing application logic, state machines, protocol parsers, and driver logic through mocked HAL functions.