Sphinx wavedrom extension

A sphinx extension that allows including wavedrom diagrams by using its text-based representation

Wavedrom online editor and tutorial: http://wavedrom.com/

Installation

The wavedrom extension can be installed using pip:

pip install sphinxcontrib-wavedrom

and by adding 'sphinxcontrib.wavedrom' to the extensions list in your conf.py file.

Directives

The extension is useable in the form of an extra wavedrom directive, as shown below.

.. wavedrom::

        { "signal": [
                { "name": "clk",  "wave": "P......" },
                { "name": "bus",  "wave": "x.==.=x", "data": ["head", "body", "tail", "data"] },
                { "name": "wire", "wave": "0.1..0." }
        ]}

Alternatively, it can read the json from a file:

.. wavedrom:: mywave.json

When configured to generate images (see Configuration) the directive will generate an image and include it into the input. It allows for the same configuration as the image directive:

.. wavedrom:: mywave.json
:height: 100px
:width: 200 px
:scale: 50 %
:alt: alternate text
:align: right

The image can be turned into a figure by adding a caption:

.. wavedrom:: mywave.json
    :caption: My wave figure

The extension can be configured (see Configuration) to not generate an image out of the diagram description itself, but to surround it with some html and js tags in the final html document that allow the images to be rendered by the browser. This is the currently the default for HTML output.

Configuration

The extension can be configured to either directly output images or by emitting the javascript to live-render the wavedrom code, which obviously only works for HTML output. All other outputs (most notably latexpdf) embed a generated image in any case, but this is only supported when using Python 3.

For HTML output the configuration item wavedrom_html_jsinline (default: True) can toggled to generate images instead of inline javascript code. You must add the following line to your conf.py:

wavedrom_html_jsinline = False

or overwrite the setting on the command line, for example:

sphinx-build -b html -D wavedrom_html_jsinline=0 sources build/html

HTML: Inline Javascript

When HTML building is configured to inline the javascript (default), the extension can work in 2 modes:

• Online mode: the extension links to the javascript file(s) provided by the wavedrom server
• Offline mode: the extension uses the javascript file(s) that are saved locally on your drive.

The online mode is the default one. This requires no configuration in conf.py

If offline mode is desired, the following parameters need to be provided:

• offline_skin_js_path : the path to the skin javascript file (the url to the online version is "http://wavedrom.com/skins/default.js")
• offline_wavedrom_js_path : the path to the wavedrom javascript file (the url to the online version is "http://wavedrom.com/WaveDrom.js")

The paths given for these configurations need to be relative to the configuration directory (the directory that contains conf.py)

Examples

In the example folder, you can find a couple of examples (taken from the wavedrom tutorial), illustration the use of the extension.