112 lines
3.9 KiB
ReStructuredText
112 lines
3.9 KiB
ReStructuredText
.. _no-west:
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Using Zephyr without west
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#########################
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This page provides information on using Zephyr without west. This is
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not recommended for beginners due to the extra effort involved. In
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particular, you will have to do work "by hand" to replace these
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features:
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- cloning the additional source code repositories used by Zephyr in
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addition to the main zephyr repository, and keeping them up to date
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- specifying the locations of these repositories to the Zephyr build
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system
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- flashing and debugging without understanding detailed usage of the
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relevant host tools
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.. note::
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If you have previously installed west and want to stop using it,
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uninstall it first:
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.. code-block:: console
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pip3 uninstall west
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Otherwise, Zephyr's build system will find it and may try to use
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it.
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Getting the Source
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------------------
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In addition to downloading the zephyr source code repository itself,
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you will need to manually clone the additional projects listed in the
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:term:`west manifest` file inside that repository.
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.. code-block:: console
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mkdir zephyrproject
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cd zephyrproject
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git clone https://github.com/zephyrproject-rtos/zephyr
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# clone additional repositories listed in zephyr/west.yml,
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# and check out the specified revisions as well.
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As you pull changes in the zephyr repository, you will also need to
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maintain those additional repositories, adding new ones as necessary
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and keeping existing ones up to date at the latest revisions.
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Specifying Modules
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------------------
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If you have west installed, the Zephyr build system will use it to set
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:ref:`ZEPHYR_MODULES <important-build-vars>`. If you don't have west
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installed and your application does not need any of these
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repositories, the build will still work.
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If you don't have west installed and your application *does* need one
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of these repositories, you must set :makevar:`ZEPHYR_MODULES`
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yourself. See :ref:`modules` for details.
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Flashing and Debugging
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----------------------
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Running build system targets like ``ninja flash``, ``ninja debug``,
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etc. is just a call to the corresponding :ref:`west command
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<west-build-flash-debug>`. For example, ``ninja flash`` calls ``west
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flash``\ [#wbninja]_. If you don't have west installed on your system, running
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those targets will fail. You can of course still flash and debug using
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any :ref:`debug-host-tools` which work for your board (and which those
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west commands wrap).
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If you want to use these build system targets but do not want to
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install west on your system using ``pip``, it is possible to do so
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by manually creating a :term:`west installation`:
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.. code-block:: console
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# cd into zephyrproject if not already there
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git clone https://github.com/zephyrproject-rtos/west.git .west/west
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Then create a file :file:`.west/config` with the following contents:
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.. code-block:: none
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[manifest]
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path = zephyr
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[zephyr]
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base = zephyr
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After that, and in order for ``ninja`` to be able to invoke ``west``
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to flash and debug, you must specify the west directory. This can be
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done by setting the environment variable ``WEST_DIR`` to point to
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:file:`zephyrproject/.west/west` before running CMake to set up a
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build directory.
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.. rubric:: Footnotes
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.. [#wbninja]
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Note that ``west build`` invokes ``ninja``, among other
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tools. There's no recursive invocation of either ``west`` or
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``ninja`` involved by default, however, as ``west build`` does not
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invoke ``ninja flash``, ``debug``, etc. The one exception is if you
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specifically run one of these build system targets with a command
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line like ``west build -t flash``. In that case, west is run twice:
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once for ``west build``, and in a subprocess, again for ``west
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flash``. Even in this case, ``ninja`` is only run once, as ``ninja
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flash``. This is because these build system targets depend on an
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up to date build of the Zephyr application, so it's compiled before
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``west flash`` is run.
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