Why Read This Book

You will learn how to make firmware safer to change, faster to verify, and less dependent on fragile hardware-specific assumptions. The book focuses on practical testing techniques for embedded code, including unit testing and hardware abstraction, so you can catch bugs earlier and build firmware that survives real-world constraints. If you want a developer-oriented path to more reliable embedded software, this book gives you methods you can apply immediately.

Who Will Benefit

Embedded firmware developers, test engineers, and technical leads with some C experience who want to improve the reliability and maintainability of microcontroller or RTOS-based code.

Level: Intermediate — Prerequisites: Basic C programming and familiarity with embedded systems concepts such as registers, interrupts, and build/debug workflows.

Key Takeaways

• Design firmware for testability using hardware abstraction layers and clear module boundaries
• Write unit tests for embedded C code that run on a host machine or target environment
• Mock or stub peripherals, drivers, and hardware-dependent services to isolate logic
• Build test strategies for interrupts, timing-dependent code, and state machines
• Integrate automated testing into embedded development workflows and CI pipelines
• Diagnose common testing pitfalls in firmware projects and improve code reliability over time

Topics Covered

1. Introduction to firmware testing
2. Why embedded code is hard to test
3. Testable firmware architecture
4. Hardware abstraction and dependency isolation
5. Unit testing fundamentals for embedded C
6. Mocks, stubs, and fakes for peripherals
7. Testing drivers and low-level modules
8. Testing state machines, interrupts, and timing logic
9. Host-based test execution and target-side tests
10. Automation and continuous integration for firmware
11. Test coverage, code quality, and refactoring
12. Debugging failing tests and maintaining test suites
13. Building a practical testing workflow for embedded teams

Languages, Platforms & Tools

How It Compares

More hands-on and firmware-focused than Test-Driven Development for Embedded C by James Grenning, and more implementation-oriented than broader embedded software quality texts.