Introduction to Zephyr Part 4: Devicetree Tutorial

This one-hour tutorial explores Devicetree, the powerful method Zephyr uses to describe hardware configurations in embedded systems. Learn how Devicetree evolved from Open Firmware to become the standard for defining hardware in both Linux and Zephyr, providing a flexible way to separate code from hardware specifics. Explore essential concepts including nodes, properties, compatible strings, and hierarchical tree structures that organize hardware definitions. Understand key properties like "status" and "reg" that enable devices and map them in memory, plus discover how aliases and chosen nodes simplify references to common hardware components. Dive into Devicetree syntax with DTS and DTSI files, overlays, and includes that help compose complete hardware configurations. Follow along with a hands-on example defining a button in a Devicetree overlay and accessing it from C code, gaining practical insights into bindings, phandles, and driver implementations. By the end, you'll confidently navigate and modify Devicetree files—a crucial skill for building portable, maintainable embedded firmware that scales across different boards without rewriting low-level code.