Radomir Dopieralski f477848ac1 paralleldisplay: reset and read pins should be optional
The ``reset`` and ``read`` pins should be optional, but the espressif
code had several places where it assumed they are not, and a bug that
caused a crash on ``release_displays`` if they were made optional.

The bug was caused by the fields for storing pin numbers being set
to ``NO_PIN``, which has value of -1, while the fields have type
``uint8_t``.  That set the actual value to 255, and a subsequent
comparison to ``NO_PIN`` returned false.
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CircuitPython
=============

.. image:: https://s3.amazonaws.com/adafruit-circuit-python/CircuitPython_Repo_header_logo.png

|Build Status| |Doc Status| |License| |Discord| |Weblate|

`circuitpython.org <https://circuitpython.org>`__ \| `Get CircuitPython <#get-circuitpython>`__ \|
`Documentation <#documentation>`__ \| `Contributing <#contributing>`__ \|
`Branding <#branding>`__ \| `Differences from Micropython <#differences-from-micropython>`__ \|
`Project Structure <#project-structure>`__

**CircuitPython** is a *beginner friendly*, open source version of Python for tiny, inexpensive
computers called microcontrollers.

This package contains the "stubs", or type definitions for CircuitPython.  With some advanced
editors and other tools, this information can be identify TypeErrors, AttributeErrors, and other
problems before you deploy your code to a device and can even help autocomplete your code.

.. |Build Status| image:: https://github.com/adafruit/circuitpython/workflows/Build%20CI/badge.svg
   :target: https://github.com/adafruit/circuitpython/actions?query=branch%3Amain
.. |Doc Status| image:: https://readthedocs.org/projects/circuitpython/badge/?version=latest
   :target: http://circuitpython.readthedocs.io/
.. |Discord| image:: https://img.shields.io/discord/327254708534116352.svg
   :target: https://adafru.it/discord
.. |License| image:: https://img.shields.io/badge/License-MIT-brightgreen.svg
   :target: https://choosealicense.com/licenses/mit/
.. |Weblate| image:: https://hosted.weblate.org/widgets/circuitpython/-/svg-badge.svg
   :target: https://hosted.weblate.org/engage/circuitpython/?utm_source=widget
Languages
C 90.2%
Python 7.4%
Makefile 1.8%
Shell 0.2%