Source Tree Structure

Understanding the Zephyr source tree can be helpful in locating the code associated with a particular Zephyr feature.

The Zephyr source tree provides the following top-level directories, each of which may have one or more additional levels of subdirectories which are not described here.

arch

Architecture-specific kernel and system-on-chip (SoC) code. Each supported architecture (for example, x86 and ARM) has its own subdirectory, which contains additional subdirectories for the following areas:

• architecture-specific kernel source files
• architecture-specific kernel include files for private APIs
• SoC-specific code

boards

Board related code and configuration files.

doc

Zephyr technical documentation source files and tools used to generate the https://docs.zephyrproject.org web content.

drivers

Device driver code.

dts

Device tree source (.dts) files used to describe non-discoverable board-specific hardware details previously hard coded in the OS source code.

ext

Externally created code that has been integrated into Zephyr from other sources, such as hardware interface code supplied by manufacturers and cryptographic library code.

include

Include files for all public APIs, except those defined under lib.

kernel

Architecture-independent kernel code.

lib

Library code, including the minimal standard C library.

misc

Miscellaneous code that doesn’t belong to any of the other top-level directories.

samples

Sample applications that demonstrate the use of Zephyr features.

scripts

Various programs and other files used to build and test Zephyr applications.

cmake

Additional build scripts needed to build Zephyr.

subsys

Subsystems of Zephyr, including:

• USB device stack code.
• Networking code, including the Bluetooth stack and networking stacks.
• File system code.
• Bluetooth host and controller

tests

Test code and benchmarks for Zephyr features.