:mod:`paralleldisplay`
======================

.. py:module:: paralleldisplay

.. autoapi-nested-parse::

   Native helpers for driving parallel displays



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.. py:class:: ParallelBus(*, data0: microcontroller.Pin, command: microcontroller.Pin, chip_select: microcontroller.Pin, write: microcontroller.Pin, read: microcontroller.Pin, reset: microcontroller.Pin, frequency: int = 30000000)

   Manage updating a display over 8-bit parallel bus in the background while Python code runs. This
   protocol may be refered to as 8080-I Series Parallel Interface in datasheets. It doesn't handle
   display initialization.

   Create a ParallelBus object associated with the given pins. The bus is inferred from data0
   by implying the next 7 additional pins on a given GPIO port.

   The parallel bus and pins are then in use by the display until `displayio.release_displays()`
   is called even after a reload. (It does this so CircuitPython can use the display after your
   code is done.) So, the first time you initialize a display bus in code.py you should call
   :py:func:`displayio.release_displays` first, otherwise it will error after the first code.py run.

   :param microcontroller.Pin data_pins: A list of data pins.  Specify exactly one of ``data_pins`` or ``data0``.
   :param microcontroller.Pin data0: The first data pin. The rest are implied
   :param microcontroller.Pin command: Data or command pin
   :param microcontroller.Pin chip_select: Chip select pin
   :param microcontroller.Pin write: Write pin
   :param microcontroller.Pin read: Read pin
   :param microcontroller.Pin reset: Reset pin
   :param int frequency: The communication frequency in Hz for the display on the bus

   .. py:method:: reset() -> None

      Performs a hardware reset via the reset pin. Raises an exception if called when no reset pin
      is available.


   .. py:method:: send(command: int, data: _typing.ReadableBuffer) -> None

      Sends the given command value followed by the full set of data. Display state, such as
      vertical scroll, set via ``send`` may or may not be reset once the code is done.