134 lines
5.1 KiB
ReStructuredText
134 lines
5.1 KiB
ReStructuredText
.. _zephyr_doc:
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Zephyr documentation
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####################
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These instructions will walk you through generating the Zephyr Project's
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documentation on your local system using the same documentation sources
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as we use to create the online documentation found at
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https://zephyrproject.org/doc
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Documentation overview
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**********************
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Zephyr Project content is written using the reStructuredText markup
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language (.rst file extension) with Sphinx extensions, and processed
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using sphinx to create a formatted stand-alone website. Developers can
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view this content either in its raw form as .rst markup files, or you
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can generate the HTML content and view it with a web browser directly on
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your workstation. This same .rst content is also fed into the Zephyr
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Project's public website documentation area (with a different theme
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applied).
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You can read details about `reStructuredText`_, and `Sphinx`_ from
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their respective websites.
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The project's documentation contains the following items:
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* ReStructuredText source files used to generate documentation found at the
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https://zephyrproject.org/doc website. Most of the reStructuredText sources
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are found in the ``/doc`` directory, but others are stored within the
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code source tree near their specific component (such as ``/samples`` and
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``/boards``)
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* Doxygen-generated material used to create all API-specific documents
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also found at https://zephyrproject.org/doc
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* Script-generated material for kernel configuration options based on Kconfig
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files found in the source code tree
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The reStructuredText files are processed by the Sphinx documentation system,
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and make use of the breathe extension for including the doxygen-generated API
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material. Additional tools are required to generate the
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documentation locally, as described in the following sections.
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Installing the documentation processors
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***************************************
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Our documentation processing has been tested to run with:
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* Doxygen version 1.8.11
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* Sphinx version 1.5.5
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* Breathe version 4.6.0
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* docutils version 0.13.1
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Begin by cloning a copy of the git repository for the zephyr project and
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setting up your development environment as described in :ref:`getting_started`
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or specifically for Ubuntu in :ref:`installation_linux`. (Be sure to
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export the environment variables ``ZEPHYR_GCC_VARIANT`` and
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``ZEPHYR_SDK_INSTALL_DIR`` as documented there.)
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Other than ``doxygen``, the documentation tools should be installed using ``pip``.
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If you don't already have pip installed, these commands will install it:
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.. code-block:: bash
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$ curl -O 'https://bootstrap.pypa.io/get-pip.py'
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$ ./get-pip.py
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$ rm get-pip.py
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The documentation generation tools are included in the set of tools
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expected for the Zephyr build environment and so are included in
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``requirements.txt``:
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.. code-block:: bash
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$ sudo -E apt-get install doxygen
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$ pip install -r scripts/requirements.txt
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Documentaion presentation theme
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*******************************
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Sphinx supports easy customization of the generated documentation
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appearance through the use of themes. Replace the theme files and do
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another ``make htmldocs`` and the output layout and style is changed.
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The ``read-the-docs`` theme is installed as part of the
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``requirements.txt`` list above, and will be used if it's available, for
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local doc generation.
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Running the documentation processors
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************************************
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The ``/doc`` directory in your cloned copy of the Zephyr project git
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repo has all the .rst source files, extra tools, and Makefile for
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generating a local copy of the Zephyr project's technical documentation.
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Assuming the local Zephyr project copy is ``~/zephyr``, here are the
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commands to generate the html content locally:
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.. code-block:: bash
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$ cd ~/zephyr
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$ source zephyr-env.sh
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$ make htmldocs
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Depending on your development system, it will take about 15 minutes to
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collect and generate the HTML content. When done, the HTML output will
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be in ``~/zephyr/doc/_build/html/index.html``
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Filtering expected warnings
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***************************
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Alas, there are some known issues with the doxygen/Sphinx/Breathe
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processing that generates warnings for some constructs, in particular
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around unnamed structures in nested unions or structs. Also, adding
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qualifiers to a function declaration, like __deprecated, can generate a
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warning. While these issues are being considered for fixing in
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Sphinx/Breathe, we've added a post-processing filter on the output of
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the documentation build process to remove "expected" messages from the
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generation process output.
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The output from the Sphinx build is processed by the python script
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``scripts/filter-known-issues.py`` together with a set of filter
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configuration files in the ``.known-issues/doc`` folder. (This
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filtering is done as part of the ``doc/Makefile``.)
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If you're contributing components included in the Zephyr API
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documentaion and run across these warnings, you can include filtering
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them out as "expected" warnings by adding a conf file to the
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``.known-issues/doc`` folder, following the example of other conf files
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found there.
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.. _reStructuredText: http://sphinx-doc.org/rest.html
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.. _Sphinx: http://sphinx-doc.org/
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