output.rst

Output subsystem

Currently ZPUI uses HD44780-compatible screens as output devices. Minimum screen size is 16x2, 20x4 screens are tested and working. Available output drivers:

• :ref:`output_pcf8574`
• :ref:`output_pifacecad`
• :ref:`output_adafruit`
• :ref:`output_pi_gpio`
• :ref:`output_mcp23008`

Screen object

The o variable you have supplied by main.py load_app() in your applications is a Screen instance. It provides you with a set of functions available to HD44780 displays. Most of drivers just provide low-level functions for HD44780 object, which, in turn, provides Screen object users with high-level functions described below:

.. automodule:: output.drivers.hd44780

.. autoclass:: HD44780
    :members:
    :special-members:

Glue logic functions

Warning

Not for user interaction, are called by main.py, which is ZPUI launcher.

.. autofunction:: output.output.init

Drivers:

.. toctree::
   :maxdepth: 2

   output/mcp23008.rst
   output/pcf8574.rst
   output/pifacecad.rst
   output/adafruit.rst
   output/pi_gpio.rst