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View the Zephyr Project code.

View the Zephyr Project Documentation Wiki.

How to Contribute

We are excited that you have decided to join us in contributing to the Zephyr Project!

Do also take the time to check our community guidelines and join in the conversations!

Learn more about our development model, development BKMs, coding conventions, etc.

Read the project documentation

Releases Overview

Updated versions of the Zephyr project are released approximately every three-months. Here are summaries for past releases.  See the Program Management wiki page for information about release planning and intermediate milestone dates.

Future Release Roadmap

Future release planning documentation is maintained in this live Zephyr Project GitHub roadmap.

While our expectations are for features to be completed in the release indicated, some features may be added to a release, moved to a different release, modified, or dropped altogether as further investigations and priorities are understood.

1.14 LTS Release (April 2019)

  • Support for over 160 board configurations spanning 8 architectures
  • A reimplemented Timing system simplifies drivers and reduces typical kernel build size by hundreds of bytes
  • Symmetric Multi-processing (SMP) support adds a new CPU affinity API that can pin threads to a specific set of cores
  • Zephyr now supports x86_64 architecture for QEMU targets
  • Majority of networking components and protocols (including MQTT, CoAP, LWM2M, and SNTP) now use the overhauled Network packet API
  • Native POSIX port enhanced with UART, USB, and display drivers, and a simulated NRF52832 SoC that enables running full system, multi-node simulations
  • Added an experimental BLE split-software controller for supporting multiple BLE radio hardware architectures
  • The overhauled power management subsystem now supports device-idle power management and simplifying application power management logic
  • Major updates to the logging and shell subsystem support multiple back-ends, integration of logging into the shell, and delayed log processing
  • Introduced the west tool for managing multiple repositories and enhanced support for flashing and debugging
  • Added support for application user mode, application memory partitions, and hardware stack protection in ARMv8m
  • Applied MISRA-C coding guidelines on the kernel and core components

1.13 Release (September 2018)

  • Extensible and Pluggable Tracing Support
  • Compartmentalized application memory organization
  • Logging System Overhaul
  • Introduce system calls for BSD socket APIs
  • Support for IEEE 802.1AS-2011 generalized Precision Time Protocol (gPTP)
  • Link Layer Discovery Protocol (LLDP) TX support
  • Support for TLS and DTLS using BSD socket API
  • Support for Link Layer Multicast Name Resolution (LLMNR)
  • Introduced reworked ADC API and updated Nordic, NXP, Atmel, and Designware drivers
  • Support OS-driven Power Management framework
  • Basic support for Arm TrustZone in Armv8-M

1.12 Release (June 2018)

  • Asymmetric multiprocessing (AMP) via integration of OpenAMP
  • Persistent storage support for Bluetooth Low Energy including Mesh
  • 802.1Q – Virtual Local Area Network (VLAN) traffic on an Ethernet network
  • Support multiple concurrent filesystem devices, partitions, and FS types
  • Ethernet network management interface
  • Networking traffic prioritization on a per-connection basis
  • Support for Ethernet statistical counters
  • Support for TAP net device on the native POSIX port
  • Command-line Zephyr meta-tool “west”
  • SPI slave support
  • Runtime non-volatile configuration data storage system (settings)

1.11 Release (March 2018)

  • Thread-level memory protection on x86, ARC and Arm, userspace and memory domains
  • Symmetric Multi-Processing (SMP) support on the Xtensa architecture.
  • Initial Armv8-M architecture support.
  • Native development environment on Microsoft Windows.
  • Native build target on POSIX platforms.
  • POSIX PSE52 partial support.
  • Thread support via integration with OpenThread.
  • Firmware over-the-air (FOTA) updates over BLE using MCUmgr.
  • Lightweight flash storage layer for constrained devices.
  • Additional SoC, platform and driver support for many of the already supported platforms.

Downloads

Zephyr project is provided as source code and build scripts for different target architectures and configurations, and not as a binary image. (See Supported Boards documentation for details.)  Updated versions of the Zephyr project are released approximately every three months. (See Release Overview for details.)

This downloads page is where you’ll find the latest tagged source code release along with its corresponding release notes found in the Zephyr Project GitHub repo and in the online release notes documentation.

Zephyr project source code is maintained in a Git repository.  For releases 1.14 and after, multiple repositories are used, so the preferred method for downloading source code is by using a Zephyr project tool called west.  While you can also download source as a tar.gz file or use Git commands (see the bottom of the GitHub release notes pages), this requires additional manual steps (see Using Zephyr without west documentation for details).

The project’s technical documentation is tagged to correspond with a specific release.  The latest documentation for the “master” branch under development can be found at https://docs.zephyrproject.org/. Use the version selector to see the documentation for tagged versions.