Using Zephyr without west
This page provides information on using Zephyr without west. This is not recommended for beginners due to the extra effort involved. In particular, you will have to do work “by hand” to replace these features:
cloning the additional source code repositories used by Zephyr in addition to the main zephyr repository, and keeping them up to date
specifying the locations of these repositories to the Zephyr build system
flashing and debugging without understanding detailed usage of the relevant host tools
If you have previously installed west and want to stop using it, uninstall it first:
pip3 uninstall west
Otherwise, Zephyr’s build system will find it and may try to use it.
Getting the Source
In addition to downloading the zephyr source code repository itself, you will need to manually clone the additional projects listed in the west manifest file inside that repository.
git clone https://github.com/zephyrproject-rtos/zephyr
# clone additional repositories listed in zephyr/west.yml,
# and check out the specified revisions as well.
As you pull changes in the zephyr repository, you will also need to maintain those additional repositories, adding new ones as necessary and keeping existing ones up to date at the latest revisions.
You can build a Zephyr application using CMake and Ninja (or make) directly without west installed if you specify any modules manually.
cmake -Bbuild -GNinja -DZEPHYR_MODULES=module1;module2;... samples/hello_world
When building with west installed, the Zephyr build system will use it to set ZEPHYR_MODULES.
If you don’t have west installed and your application does not need any of these repositories, the build will still work.
If you don’t have west installed and your application does need one of these repositories, you must set ZEPHYR_MODULES yourself as shown above.
See Modules (External projects) for more details.
Flashing and Debugging
Running build system targets like
etc. is just a call to the corresponding west command. For example,
ninja flash calls
flash1. If you don’t have west installed on your system, running
those targets will fail. You can of course still flash and debug using
any Flash & Debug Host Tools which work for your board (and which those
west commands wrap).
If you want to use these build system targets but do not want to
install west on your system using
pip, it is possible to do so
by manually creating a west workspace:
# cd into zephyrproject if not already there
git clone https://github.com/zephyrproject-rtos/west.git .west/west
Then create a file
.west/config with the following contents:
path = zephyr
base = zephyr
After that, and in order for
ninja to be able to invoke
to flash and debug, you must specify the west directory. This can be
done by setting the environment variable
WEST_DIR to point to
zephyrproject/.west/west before running CMake to set up a
ninja, among other tools. There’s no recursive invocation of either
ninjainvolved by default, however, as
west builddoes not invoke
debug, etc. The one exception is if you specifically run one of these build system targets with a command line like
west build -t flash. In that case, west is run twice: once for
west build, and in a subprocess, again for
west flash. Even in this case,
ninjais only run once, as
ninja flash. This is because these build system targets depend on an up to date build of the Zephyr application, so it’s compiled before
west flashis run.