Introduction
============

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    :target: https://circuitpython.readthedocs.io/projects/il91874/en/latest/
    :alt: Documentation Status

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    :alt: Discord

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    :target: https://travis-ci.com/adafruit/Adafruit_CircuitPython_IL91874
    :alt: Build Status

CircuitPython `displayio` driver for IL91874-based ePaper displays


Dependencies
=============
This driver depends on:

* `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_

Please ensure all dependencies are available on the CircuitPython filesystem.
This is easily achieved by downloading
`the Adafruit library and driver bundle <https://github.com/adafruit/Adafruit_CircuitPython_Bundle>`_.

Installing from PyPI
=====================
.. note:: This library is not available on PyPI yet. Install documentation is included
   as a standard element. Stay tuned for PyPI availability!

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
PyPI <https://pypi.org/project/adafruit-circuitpython-il91874/>`_. To install for current user:

.. code-block:: shell

    pip3 install adafruit-circuitpython-il91874

To install system-wide (this may be required in some cases):

.. code-block:: shell

    sudo pip3 install adafruit-circuitpython-il91874

To install in a virtual environment in your current project:

.. code-block:: shell

    mkdir project-name && cd project-name
    python3 -m venv .env
    source .env/bin/activate
    pip3 install adafruit-circuitpython-il91874

Usage Example
=============

.. code-block:: python

    """Simple test script for 2.7" 264x176 Tri-Color display shield

    Supported products:
      * Adafruit 2.7" Tri-Color ePaper Display Shield
        * https://www.adafruit.com/product/4229
      """

    import time
    import board
    import busio
    import displayio
    import adafruit_il91874

    displayio.release_displays()

    spi = board.SPI()
    epd_cs = board.D10
    epd_dc = board.D9

    display_bus = displayio.FourWire(spi, command=epd_dc, chip_select=epd_cs, baudrate=1000000)
    time.sleep(1)

    display = adafruit_il91874.IL91874(display_bus, width=264, height=176, highlight_color=0xff0000, rotation=90)

    g = displayio.Group()

    f = open("/display-ruler.bmp", "rb")

    pic = displayio.OnDiskBitmap(f)
    t = displayio.TileGrid(pic, pixel_shader=displayio.ColorConverter())
    g.append(t)

    display.show(g)

    display.refresh()

    print("refreshed")

    time.sleep(120)

Contributing
============

Contributions are welcome! Please read our `Code of Conduct
<https://github.com/adafruit/Adafruit_CircuitPython_IL91874/blob/master/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.

Sphinx documentation
-----------------------

Sphinx is used to build the documentation based on rST files and comments in the code. First,
install dependencies (feel free to reuse the virtual environment from above):

.. code-block:: shell

    python3 -m venv .env
    source .env/bin/activate
    pip install Sphinx sphinx-rtd-theme

Now, once you have the virtual environment activated:

.. code-block:: shell

    cd docs
    sphinx-build -E -W -b html . _build/html

This will output the documentation to ``docs/_build/html``. Open the index.html in your browser to
view them. It will also (due to -W) error out on any warning like Travis will. This is a good way to
locally verify it will pass.