Introduction
This repository contains a selection of packages emulating the CircuitPython API for devices or hosts running CPython or MicroPython. Working code exists to emulate these CircuitPython packages:
analogio - analog input/output pins, using pin identities from board+microcontroller packages
bitbangio - software-driven interfaces for I2C, SPI
board - breakout-specific pin identities
busio - hardware-driven interfaces for I2C, SPI, UART
digitalio - digital input/output pins, using pin identities from board+microcontroller packages
keypad - support for scanning keys and key matrices
microcontroller - chip-specific pin identities
micropython - MicroPython-specific module
neopixel_write - low-level interface to NeoPixels
pulseio - contains classes that provide access to basic pulse IO (PWM)
pwmio - contains classes that provide access to basic pulse IO (PWM)
rainbowio - provides the colorwheel() function
usb_hid - act as a hid-device using usb_gadget kernel driver
For details, see the Blinka API reference.
Dependencies
The emulation described above is intended to provide a CircuitPython-like API for devices which are running CPython or 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 in the test/src folder under testing.universal are by design intended to run on either CircuitPython or CPython/Micropython+compatibility layer to prove conformance.
Installing from PyPI
On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:
pip3 install Adafruit-BlinkaTo install system-wide (this may be required in some cases):
sudo pip3 install Adafruit-BlinkaTo install in a virtual environment in your current project:
mkdir project-name && cd project-name
python3 -m venv .env
source .env/bin/activate
pip3 install Adafruit-BlinkaUsage Example
At the time of writing (git:7fc1f8ab), the following sequence runs through some basic testing of the digitalio compatibility layer…
from testing import test_module_name
test_module_name("testing.universal.digitalio")An example log from running the suites is here .
Contributing
Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.
Building locally
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):
python3 -m venv .env
source .env/bin/activate
pip install Sphinx sphinx-rtd-theme Adafruit-PlatformDetectNow, once you have the virtual environment activated:
cd docs
sphinx-build -E -W -b html . _build/htmlThis 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.
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