Embedded C: Reusable Modules & Unit Testing | Udemy

This course contains the use of artificial intelligence.

(Used only for minor visual assistance such as slide layout. All instruction, code, and narration are created by the instructor.)

Course Description

Most embedded systems start simple, but quickly become harder to test, harder to scale, and harder to maintain.

This course focuses on solving that by building reusable embedded C modules and validating them using host-based unit testing.

What this course is about

You’ll build a set of practical embedded components and see how they fit together in a clean, event-driven system.

The focus is on:

• Reusable design
• Predictable behavior
• Proper verification

All testing is done on the host using Unity and Ceedling, so you can validate firmware logic without hardware.

What you’ll build

Throughout the course, you’ll work with core embedded building blocks, including:

• Bit and register field helpers
• Ring buffer (deterministic, stream-safe)
• Fixed-size queue (no dynamic allocation)
• Event dispatcher (ID to handler routing)
• Table-driven finite state machine
• Integrated event-driven mini system

Each module is:

• Statically allocated
• Deterministic
• Tested with edge cases
• Designed for reuse

Testing approach

Every component is verified with unit tests on the host.

This includes:

• Validating normal behavior
• Handling edge cases
• Testing failure conditions
• Verifying integration between components

You’ll also see use-case style tests and system-level flows, so it’s clear how each piece behaves in a working application.

How this course is different

This is not a “type along” coding course.

The focus is on:

• Understanding real implementations
• Testing behavior properly
• Seeing how components interact in a system

The goal is not just to write code, but to build components you can reuse and trust.

Why host-based testing matters

Most embedded logic does not require hardware to verify.

By testing on your PC, you can:

• Iterate faster
• Catch edge cases early
• Improve code quality before deployment

This workflow is widely used in professional embedded development and is often missing from traditional courses.

What you’ll walk away with

By the end of this course, you’ll be able to:

• Design reusable embedded C modules with clean APIs
• Structure firmware using event-driven patterns
• Write and run unit tests using Unity and Ceedling
• Validate behavior, including edge cases, on the host
• Integrate components into a complete working system