:target: https://travis-ci.org/adafruit/Adafruit__Micropython_Blinka
:alt: Build Status
-.. todo:: Describe what the library does.
+This repository contains a selection of packages mirroring the CircuitPython API
+on hosts running micropython. Working code exists to emulate the CircuitPython packages;
+
+* **board** - breakout-specific pin identities
+* **microcontroller** - chip-specific pin identities
+* **digitalio** - digital input/output pins, using pin identities from board+microcontroller packages
+
Dependencies
=============
-This driver depends on:
-* Micropython
+The Micropython compatibility layers described above are intended to provide a CircuitPython-like API for devices which
+are running Micropython. Since corresponding packages should be built-in to any standard
+CircuitPython image, they have no value on a device already running CircuitPython and would likely conflict in unhappy ways.
+
+The test suites under **testing.implementation.all** are by design
+intended to run on *either* CircuitPython *or* Micropython+compatibility layer to prove conformance.
+
+The test suites under **testing.implementation.micropython** will only run
+on Micropython and **testing.implementation.circuitpython** will only run on CircuitPython
+
Usage Example
=============
-.. todo:: Add a quick, simple example. It and other examples should live in the examples folder and be included in docs/examples.rst.
+At the time of writing (`git:3b2fc268 <https://github.com/cefn/Adafruit_Micropython_Blinka/tree/3b2fc268d89aee6a648da456224e6d48d2476baa>`_),
+the following sequence runs through some basic testing of the digitalio compatibility layer...
+
+.. code-block:: python
+
+ import testing
+ testing.main()
+
+A typical log from running the suites is `here <https://github.com/cefn/Adafruit_Micropython_Blinka/issues/2#issuecomment-366713394>`_ .
+
Contributing
============