Zephyr RTOS Firmware Guide

Operating Systems

Open-source, scalable real-time operating system by the Linux Foundation, supporting 600+ boards. The foundation of Nordic's nRF Connect SDK and increasingly popular across the embedded industry.

Key Topics

Devicetree configuration
Kconfig build system
Kernel primitives (threads, semaphores)
Device driver model
West build tool
Logging and shell subsystems

Supported Hardware

nRF52832

Cost-effective Bluetooth 5.4 SoC with 512KB Flash and 64KB RAM, ideal for wearables, beacons, and low-power sensor applications.

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nRF52840

Advanced multiprotocol SoC with 1MB Flash, 256KB RAM, and USB support. The go-to chip for Bluetooth 5.4, Thread, Zigbee, and 802.15.4 applications.

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nRF5340

Dual-core Bluetooth 5.4 SoC with dedicated application and network processors. 1MB Flash + 512KB RAM on the application core, with hardware security via ARM TrustZone.

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nRF54L15

Next-generation ultra-low-power Bluetooth 5.4 SoC with RISC-V and ARM Cortex-M33 cores. Designed for ultra-constrained battery-powered devices.

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nRF9160

Cellular IoT SiP with integrated LTE-M/NB-IoT modem and GPS. Perfect for asset tracking, remote monitoring, and any application requiring wide-area connectivity.

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nRF9161

Next-gen cellular IoT SiP with DECT NR+ support, LTE-M/NB-IoT modem, and GNSS. Enhanced successor to the nRF9160 with improved power efficiency.

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nRF7002

Wi-Fi 6 companion IC designed to work alongside Nordic BLE SoCs. Adds dual-band Wi-Fi connectivity to existing nRF52/nRF53 designs.

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ESP32

Dual-core Wi-Fi and Bluetooth combo chip with extensive peripheral support. One of the most popular IoT microcontrollers for prototyping and production.

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ESP32-S3

AI-capable dual-core MCU with vector instructions for neural network acceleration, Wi-Fi, and BLE 5.0. Ideal for AIoT edge computing applications.

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ESP32-C3

Cost-effective RISC-V single-core Wi-Fi and BLE 5.0 chip. A great choice for simple connected devices where cost and power matter.

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STM32F4

High-performance ARM Cortex-M4 series with DSP and FPU. Industry workhorse for motor control, industrial automation, and signal processing applications.

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STM32L4

Ultra-low-power ARM Cortex-M4 series optimized for battery-operated applications. Features multiple low-power modes and efficient wake-up capabilities.

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STM32H7

Highest-performance STM32 series with ARM Cortex-M7 running at 480 MHz. Ideal for graphics, AI inference, and complex signal processing at the edge.

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More Operating Systems

Frequently Asked Questions

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