A Sphinx extension to generate bit field diagrams with the bit_field Python package.

pip install sphinxcontrib-bitfield

Add sphinxcontrib.bitfield in extensions of `conf.py`:

extensions = ['sphinxcontrib.bitfield']

To enable output with LaTeX support, add an image converter from SVG to PNG:

extensions = ['sphinx.ext.imgconverter', 'sphinxcontrib.bitfield']

Use directive bitfield with the description of the bitfield in JSON format:

.. bitfield::
    :bits: 32
    :lanes: 2

        [
            { "name": "IPO",   "bits": 8, "attr": "RO" },
            {                  "bits": 7 },
            { "name": "BRK",   "bits": 5, "attr": "RW", "type": 4 },
            { "name": "CPK",   "bits": 1 },
            { "name": "Clear", "bits": 3 },
            { "bits": 8 }
        ]

The bitfield directive accepts the following options:

vspace:

vertical space - default 80

hspace:

horizontal space - default 640

lanes:

rectangle lanes - default 2

bits:

overall bitwidth - default 32

fontfamily:

default sans-serif

fontweight:

default normal

fontsize:

default 14

strokewidth:

default 1

compact:

compact rendering mode

hflip:

horizontal flip

vflip:

vertical flip

uneven:

uneven lanes

trim:

trim long bitfield names, must provide the horizontal space available for a single character

legend:

space separated list of name and type optionally enclosed in quotes

caption:

String caption for the bitfield. If specified, the bitfield will be rendered as a figure

For more details, see the bit_field package.