Overview

This book is a deep, practical guide to building fast, reliable, and secure embedded systems with Zephyr. It opens by demystifying the kernel's initialization levels and the build system's inner workings-Kconfig, devicetree, and CMake-so you can reason about determinism, init ordering, and startup time while producing hermetic, reproducible builds with west. You'll learn to craft robust board ports and SoC integrations, extend core subsystems cleanly, layer configurations without code forks, and tune toolchains and linkers for deterministic outputs. Compliance-minded engineering is woven throughout, with static analysis, hardening flags, and auditable workflows that scale across teams and CI. From there, the focus turns to real-time performance under tight budgets. You'll design priority hierarchies, ISR-to-thread handoffs, and synchronization strategies that avoid priority inversion, then quantify worst-case latency across single- and multi-core systems. Memory is treated as architecture: allocate by lifetime and criticality, enforce isolation with user mode and memory domains, place code and data with custom linkers, and master cache and DMA coherency. High-performance I/O pipelines are built from portable devicetree bindings and the device model, leveraging asynchronous APIs, zero-copy, and scatter-gather to maximize throughput for SPI, I2C, and UART. Power management is addressed holistically-system states, runtime PM, tickless idle, DVFS, low-power networking, and batching-guided by measurement, energy KPIs, and regression budgets. Security, connectivity, and lifecycle operations round out the blueprint. You'll navigate Zephyr's networking internals to tune buffers and offload paths, choose between sockets and native APIs, and deliver robust IPv6, 6LoWPAN, BLE, and Wi-Fi stacks with CoAP, MQTT, and LwM2M on constrained links. The book integrates TLS/DTLS with mbedTLS or TinyCrypt, hardware acceleration and PSA Crypto, and a full credential lifecycle. Persistent data is engineered for integrity and endurance using flash-aware partitioning, NVS, LittleFS or FATFS tuning, settings, journaling, redundancy, and encryption at rest with secure elements. Finally, you'll build a resilient chain of trust with MCUboot and TF-M, enforce least privilege at runtime, implement robust OTA across mcumgr, BLE, serial, and FOTA with anti-rollback and device attestation, and operate fleets with rich observability-deferred logging, tracing, DWT/ITM timing, coredumps, coverage, fuzzing, benchmarks, and safe rollout strategies. Written for senior firmware engineers and system architects, this is the playbook for measurable latency, reproducible toolchains, provable security, and dependable deployments at scale.

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