Mastering Zephyr RTOS 4.4 on STM32CubeIDE 2.2

Have you ever built a Zephyr RTOS project with west build, opened it in STM32CubeIDE 2.2, and still felt unsure what is actually happening inside the device?The code compiles fine. The ELF loads. The debugger connects. But then things get confusing-threads behave differently than expected, breakpoints don't always tell the full story, and system behavior feels harder to predict than in traditional STM32 bare-metal projects.So the real question is: How do you actually understand and debug a West-compiled Zephyr 4.4 ELF binary inside STM32CubeIDE 2.2 with confidence?This book is written to answer that gap.Have you ever tried stepping through Zephyr code and noticed that what you see in the debugger doesn't fully match how the system behaves in real time?That's not a tool failure-it's a visibility problem. Zephyr introduces scheduling, threading, interrupts, and abstraction layers that change how execution flows compared to simple firmware.So you start asking: - Where is my thread actually executing?- Why did the interrupt fire before my task?- Is this a timing issue or a priority issue?- What part of the system is the debugger actually showing me?This book focuses on making those questions answerable.It helps you understand: - how Zephyr threads appear and behave inside STM32CubeIDE- what the West build system produces in an ELF file- how scheduling and interrupts affect debugging results- how STM32 hardware and Zephyr abstraction interact- how to interpret real runtime behavior instead of guessingBecause in real embedded systems, most problems are not compilation errors.They are execution-level problems: - timing mismatches- interrupt conflicts- stack or memory issues- scheduling delays- unexpected peripheral behaviorAnd these only make sense when you can see what the…