├── adafruit_bus_device ├── __init__.py ├── spi_device.py └── i2c_device.py ├── docs ├── _static │ ├── favicon.ico │ ├── favicon.ico.license │ └── custom.css ├── api.rst.license ├── examples.rst.license ├── index.rst.license ├── requirements.txt ├── api.rst ├── examples.rst ├── index.rst └── conf.py ├── README.rst.license ├── optional_requirements.txt ├── requirements.txt ├── .gitattributes ├── .github ├── workflows │ ├── build.yml │ ├── release_pypi.yml │ ├── release_gh.yml │ └── failure-help-text.yml └── PULL_REQUEST_TEMPLATE │ └── adafruit_circuitpython_pr.md ├── .readthedocs.yaml ├── .pre-commit-config.yaml ├── examples ├── busdevice_read_register_i2c_simpletest.py └── busdevice_read_register_spi_simpletest.py ├── LICENSE ├── LICENSES ├── MIT.txt ├── Unlicense.txt └── CC-BY-4.0.txt ├── pyproject.toml ├── .gitignore ├── README.rst ├── ruff.toml └── CODE_OF_CONDUCT.md /adafruit_bus_device/__init__.py: -------------------------------------------------------------------------------- 1 | -------------------------------------------------------------------------------- /docs/_static/favicon.ico: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/adafruit/Adafruit_CircuitPython_BusDevice/HEAD/docs/_static/favicon.ico -------------------------------------------------------------------------------- /docs/api.rst.license: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2020 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | -------------------------------------------------------------------------------- /docs/examples.rst.license: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2020 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | -------------------------------------------------------------------------------- /docs/index.rst.license: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2020 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | -------------------------------------------------------------------------------- /README.rst.license: -------------------------------------------------------------------------------- 1 | SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries 2 | 3 | SPDX-License-Identifier: MIT 4 | -------------------------------------------------------------------------------- /optional_requirements.txt: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2022 Alec Delaney, for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | -------------------------------------------------------------------------------- /docs/_static/favicon.ico.license: -------------------------------------------------------------------------------- 1 | SPDX-FileCopyrightText: 2018 Phillip Torrone for Adafruit Industries 2 | 3 | SPDX-License-Identifier: CC-BY-4.0 4 | -------------------------------------------------------------------------------- /docs/requirements.txt: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | sphinx 6 | sphinxcontrib-jquery 7 | sphinx-rtd-theme 8 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2022 Alec Delaney, for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | Adafruit-Blinka>=7.0.0 6 | adafruit-circuitpython-typing 7 | -------------------------------------------------------------------------------- /.gitattributes: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2024 Justin Myers for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | .py text eol=lf 6 | .rst text eol=lf 7 | .txt text eol=lf 8 | .yaml text eol=lf 9 | .toml text eol=lf 10 | .license text eol=lf 11 | .md text eol=lf 12 | -------------------------------------------------------------------------------- /docs/api.rst: -------------------------------------------------------------------------------- 1 | 2 | .. If you created a package, create one automodule per module in the package. 3 | 4 | API Reference 5 | ############# 6 | 7 | .. automodule:: adafruit_bus_device.i2c_device 8 | :members: 9 | 10 | .. automodule:: adafruit_bus_device.spi_device 11 | :members: 12 | -------------------------------------------------------------------------------- /docs/_static/custom.css: -------------------------------------------------------------------------------- 1 | /* SPDX-FileCopyrightText: 2025 Sam Blenny 2 | * SPDX-License-Identifier: MIT 3 | */ 4 | 5 | /* Monkey patch the rtd theme to prevent horizontal stacking of short items 6 | * see https://github.com/readthedocs/sphinx_rtd_theme/issues/1301 7 | */ 8 | .py.property{display: block !important;} 9 | -------------------------------------------------------------------------------- /.github/workflows/build.yml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | name: Build CI 6 | 7 | on: [pull_request, push] 8 | 9 | jobs: 10 | test: 11 | runs-on: ubuntu-latest 12 | steps: 13 | - name: Run Build CI workflow 14 | uses: adafruit/workflows-circuitpython-libs/build@main 15 | -------------------------------------------------------------------------------- /docs/examples.rst: -------------------------------------------------------------------------------- 1 | Simple test 2 | ------------ 3 | 4 | Ensure your device works with this simple test. 5 | 6 | .. literalinclude:: ../examples/busdevice_read_register_i2c_simpletest.py 7 | :caption: examples/busdevice_read_register_i2c_simpletest.py 8 | :linenos: 9 | 10 | .. literalinclude:: ../examples/busdevice_read_register_spi_simpletest.py 11 | :caption: examples/busdevice_read_register_spi_simpletest.py 12 | :linenos: 13 | -------------------------------------------------------------------------------- /.readthedocs.yaml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | # Read the Docs configuration file 6 | # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details 7 | 8 | # Required 9 | version: 2 10 | 11 | sphinx: 12 | configuration: docs/conf.py 13 | 14 | build: 15 | os: ubuntu-lts-latest 16 | tools: 17 | python: "3" 18 | 19 | python: 20 | install: 21 | - requirements: docs/requirements.txt 22 | - requirements: requirements.txt 23 | -------------------------------------------------------------------------------- /.github/workflows/release_pypi.yml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | name: PyPI Release Actions 6 | 7 | on: 8 | release: 9 | types: [published] 10 | 11 | jobs: 12 | upload-release-assets: 13 | runs-on: ubuntu-latest 14 | steps: 15 | - name: Run PyPI Release CI workflow 16 | uses: adafruit/workflows-circuitpython-libs/release-pypi@main 17 | with: 18 | pypi-username: ${{ secrets.pypi_username }} 19 | pypi-password: ${{ secrets.pypi_password }} 20 | -------------------------------------------------------------------------------- /.github/workflows/release_gh.yml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | name: GitHub Release Actions 6 | 7 | on: 8 | release: 9 | types: [published] 10 | 11 | jobs: 12 | upload-release-assets: 13 | runs-on: ubuntu-latest 14 | steps: 15 | - name: Run GitHub Release CI workflow 16 | uses: adafruit/workflows-circuitpython-libs/release-gh@main 17 | with: 18 | github-token: ${{ secrets.GITHUB_TOKEN }} 19 | upload-url: ${{ github.event.release.upload_url }} 20 | -------------------------------------------------------------------------------- /.github/workflows/failure-help-text.yml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 Scott Shawcroft for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | name: Failure help text 6 | 7 | on: 8 | workflow_run: 9 | workflows: ["Build CI"] 10 | types: 11 | - completed 12 | 13 | jobs: 14 | post-help: 15 | runs-on: ubuntu-latest 16 | if: ${{ github.event.workflow_run.conclusion == 'failure' && github.event.workflow_run.event == 'pull_request' }} 17 | steps: 18 | - name: Post comment to help 19 | uses: adafruit/circuitpython-action-library-ci-failed@v1 20 | -------------------------------------------------------------------------------- /.pre-commit-config.yaml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2024 Justin Myers for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | repos: 6 | - repo: https://github.com/pre-commit/pre-commit-hooks 7 | rev: v4.5.0 8 | hooks: 9 | - id: check-yaml 10 | - id: end-of-file-fixer 11 | - id: trailing-whitespace 12 | - repo: https://github.com/astral-sh/ruff-pre-commit 13 | rev: v0.3.4 14 | hooks: 15 | - id: ruff-format 16 | - id: ruff 17 | args: ["--fix"] 18 | - repo: https://github.com/fsfe/reuse-tool 19 | rev: v3.0.1 20 | hooks: 21 | - id: reuse 22 | -------------------------------------------------------------------------------- /examples/busdevice_read_register_i2c_simpletest.py: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries 2 | # SPDX-License-Identifier: MIT 3 | 4 | import board 5 | import busio 6 | 7 | from adafruit_bus_device.i2c_device import I2CDevice 8 | 9 | DEVICE_ADDRESS = 0x68 # device address of DS3231 board 10 | A_DEVICE_REGISTER = 0x0E # device id register on the DS3231 board 11 | 12 | # The follow is for I2C communications 13 | comm_port = busio.I2C(board.SCL, board.SDA) 14 | device = I2CDevice(comm_port, DEVICE_ADDRESS) 15 | 16 | with device as bus_device: 17 | bus_device.write(bytes([A_DEVICE_REGISTER])) 18 | result = bytearray(1) 19 | bus_device.readinto(result) 20 | 21 | print("".join(f"{x:02x}" for x in result)) 22 | -------------------------------------------------------------------------------- /examples/busdevice_read_register_spi_simpletest.py: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries 2 | # SPDX-License-Identifier: MIT 3 | 4 | import board 5 | import busio 6 | import digitalio 7 | 8 | from adafruit_bus_device.spi_device import SPIDevice 9 | 10 | A_DEVICE_REGISTER = 0xD0 # device id register on the BMP280 board 11 | 12 | # The follow is for SPI communications 13 | cs = digitalio.DigitalInOut(board.A2) 14 | comm_port = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO) 15 | device = SPIDevice(comm_port, cs) 16 | 17 | with device as bus_device: 18 | bus_device.write(bytes([A_DEVICE_REGISTER])) 19 | result = bytearray(1) 20 | bus_device.readinto(result) 21 | 22 | print("".join(f"{x:02x}" for x in result)) 23 | -------------------------------------------------------------------------------- /.github/PULL_REQUEST_TEMPLATE/adafruit_circuitpython_pr.md: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | Thank you for contributing! Before you submit a pull request, please read the following. 6 | 7 | Make sure any changes you're submitting are in line with the CircuitPython Design Guide, available here: https://docs.circuitpython.org/en/latest/docs/design_guide.html 8 | 9 | If your changes are to documentation, please verify that the documentation builds locally by following the steps found here: https://adafru.it/build-docs 10 | 11 | Before submitting the pull request, make sure you've run Pylint and Black locally on your code. You can do this manually or using pre-commit. Instructions are available here: https://adafru.it/check-your-code 12 | 13 | Please remove all of this text before submitting. Include an explanation or list of changes included in your PR, as well as, if applicable, a link to any related issues. 14 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2016 Adafruit Industries 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /LICENSES/MIT.txt: -------------------------------------------------------------------------------- 1 | MIT License Copyright (c) 2 | 3 | Permission is hereby granted, free of charge, to any person obtaining a copy 4 | of this software and associated documentation files (the "Software"), to deal 5 | in the Software without restriction, including without limitation the rights 6 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 | copies of the Software, and to permit persons to whom the Software is furnished 8 | to do so, subject to the following conditions: 9 | 10 | The above copyright notice and this permission notice (including the next 11 | paragraph) shall be included in all copies or substantial portions of the 12 | Software. 13 | 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS 16 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS 17 | OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 18 | WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF 19 | OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 20 | -------------------------------------------------------------------------------- /docs/index.rst: -------------------------------------------------------------------------------- 1 | .. include:: ../README.rst 2 | 3 | Table of Contents 4 | ================= 5 | 6 | .. toctree:: 7 | :maxdepth: 4 8 | :hidden: 9 | 10 | self 11 | 12 | .. toctree:: 13 | :caption: Examples 14 | 15 | examples 16 | 17 | .. toctree:: 18 | :caption: API Reference 19 | :maxdepth: 3 20 | 21 | api 22 | 23 | .. toctree:: 24 | :caption: Tutorials 25 | 26 | .. toctree:: 27 | :caption: Related Products 28 | 29 | .. toctree:: 30 | :caption: Other Links 31 | 32 | Download from GitHub 33 | Download Library Bundle 34 | CircuitPython Reference Documentation 35 | CircuitPython Support Forum 36 | Discord Chat 37 | Adafruit Learning System 38 | Adafruit Blog 39 | Adafruit Store 40 | 41 | Indices and tables 42 | ================== 43 | 44 | * :ref:`genindex` 45 | * :ref:`modindex` 46 | * :ref:`search` 47 | -------------------------------------------------------------------------------- /LICENSES/Unlicense.txt: -------------------------------------------------------------------------------- 1 | This is free and unencumbered software released into the public domain. 2 | 3 | Anyone is free to copy, modify, publish, use, compile, sell, or distribute 4 | this software, either in source code form or as a compiled binary, for any 5 | purpose, commercial or non-commercial, and by any means. 6 | 7 | In jurisdictions that recognize copyright laws, the author or authors of this 8 | software dedicate any and all copyright interest in the software to the public 9 | domain. We make this dedication for the benefit of the public at large and 10 | to the detriment of our heirs and successors. We intend this dedication to 11 | be an overt act of relinquishment in perpetuity of all present and future 12 | rights to this software under copyright law. 13 | 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS 16 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS 17 | BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 18 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH 19 | THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. For more information, 20 | please refer to 21 | -------------------------------------------------------------------------------- /pyproject.toml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2022 Alec Delaney for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | [build-system] 6 | requires = [ 7 | "setuptools", 8 | "wheel", 9 | "setuptools-scm", 10 | ] 11 | 12 | [project] 13 | name = "adafruit-circuitpython-busdevice" 14 | description = "CircuitPython bus device classes to manage bus sharing." 15 | version = "0.0.0+auto.0" 16 | readme = "README.rst" 17 | authors = [ 18 | {name = "Adafruit Industries", email = "circuitpython@adafruit.com"} 19 | ] 20 | urls = {Homepage = "https://github.com/adafruit/Adafruit_CircuitPython_BusDevice"} 21 | keywords = [ 22 | "adafruit", 23 | "spi", 24 | "i2c", 25 | "bus", 26 | "device", 27 | "micropython", 28 | "circuitpython", 29 | ] 30 | license = {text = "MIT"} 31 | classifiers = [ 32 | "Intended Audience :: Developers", 33 | "Topic :: Software Development :: Libraries", 34 | "Topic :: Software Development :: Embedded Systems", 35 | "Topic :: System :: Hardware", 36 | "License :: OSI Approved :: MIT License", 37 | "Programming Language :: Python :: 3", 38 | ] 39 | dynamic = ["dependencies", "optional-dependencies"] 40 | 41 | [tool.setuptools] 42 | packages = ["adafruit_bus_device"] 43 | 44 | [tool.setuptools.dynamic] 45 | dependencies = {file = ["requirements.txt"]} 46 | optional-dependencies = {optional = {file = ["optional_requirements.txt"]}} 47 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2022 Kattni Rembor, written for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | # Do not include files and directories created by your personal work environment, such as the IDE 6 | # you use, except for those already listed here. Pull requests including changes to this file will 7 | # not be accepted. 8 | 9 | # This .gitignore file contains rules for files generated by working with CircuitPython libraries, 10 | # including building Sphinx, testing with pip, and creating a virual environment, as well as the 11 | # MacOS and IDE-specific files generated by using MacOS in general, or the PyCharm or VSCode IDEs. 12 | 13 | # If you find that there are files being generated on your machine that should not be included in 14 | # your git commit, you should create a .gitignore_global file on your computer to include the 15 | # files created by your personal setup. To do so, follow the two steps below. 16 | 17 | # First, create a file called .gitignore_global somewhere convenient for you, and add rules for 18 | # the files you want to exclude from git commits. 19 | 20 | # Second, configure Git to use the exclude file for all Git repositories by running the 21 | # following via commandline, replacing "path/to/your/" with the actual path to your newly created 22 | # .gitignore_global file: 23 | # git config --global core.excludesfile path/to/your/.gitignore_global 24 | 25 | # CircuitPython-specific files 26 | *.mpy 27 | 28 | # Python-specific files 29 | __pycache__ 30 | *.pyc 31 | 32 | # Sphinx build-specific files 33 | _build 34 | 35 | # This file results from running `pip -e install .` in a local repository 36 | *.egg-info 37 | 38 | # Virtual environment-specific files 39 | .env 40 | .venv 41 | 42 | # MacOS-specific files 43 | *.DS_Store 44 | 45 | # IDE-specific files 46 | .idea 47 | .vscode 48 | *~ 49 | -------------------------------------------------------------------------------- /README.rst: -------------------------------------------------------------------------------- 1 | Adafruit CircuitPython BusDevice 2 | ================================ 3 | 4 | .. image:: https://readthedocs.org/projects/adafruit-circuitpython-busdevice/badge/?version=latest 5 | :target: https://docs.circuitpython.org/projects/busdevice/en/latest/ 6 | :alt: Documentation Status 7 | 8 | .. image:: https://raw.githubusercontent.com/adafruit/Adafruit_CircuitPython_Bundle/main/badges/adafruit_discord.svg 9 | :target: https://adafru.it/discord 10 | :alt: Discord 11 | 12 | .. image:: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice/workflows/Build%20CI/badge.svg 13 | :target: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice/actions/ 14 | :alt: Build Status 15 | 16 | .. image:: https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json 17 | :target: https://github.com/astral-sh/ruff 18 | :alt: Code Style: Ruff 19 | 20 | The ``I2CDevice`` and ``SPIDevice`` helper classes make managing transaction state 21 | on a bus easy. For example, they manage locking the bus to prevent other 22 | concurrent access. For SPI devices, it manages the chip select and protocol 23 | changes such as mode. For I2C, it manages the device address. 24 | 25 | .. _bus_device_installation: 26 | 27 | .. note:: On microcontroller boards using CircuitPython v6.3.0 or newer, the firmware 28 | may already have the ``adafruit_bus_device`` package builtin, thus there may be no 29 | need to add this package to your CIRCUITPY drive's "lib" directory. If both the 30 | builtin and add-on ``adafruit_bus_device`` packages are present, then some 31 | libraries that require this package *might* have problems importing it. 32 | 33 | Please check the `CircuitPython documentation's "module support matrix" 34 | `_ 35 | to make sure that your board's firmware does include the builtin ``adafruit_bus_device`` 36 | package. 37 | 38 | On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from 39 | PyPI `_. To install for current user: 40 | 41 | .. code-block:: shell 42 | 43 | pip3 install adafruit-circuitpython-busdevice 44 | 45 | To install system-wide (this may be required in some cases): 46 | 47 | .. code-block:: shell 48 | 49 | sudo pip3 install adafruit-circuitpython-busdevice 50 | 51 | To install in a virtual environment in your current project: 52 | 53 | .. code-block:: shell 54 | 55 | mkdir project-name && cd project-name 56 | python3 -m venv .venv 57 | source .venv/bin/activate 58 | pip3 install adafruit-circuitpython-busdevice 59 | 60 | Usage Example 61 | ============= 62 | 63 | See examples/read_register_i2c.py and examples/read_register_spi.py for examples of the module's usage. 64 | 65 | Documentation 66 | ============= 67 | 68 | API documentation for this library can be found on `Read the Docs `_. 69 | 70 | For information on building library documentation, please check out `this guide `_. 71 | 72 | Contributing 73 | ============ 74 | 75 | Contributions are welcome! Please read our `Code of Conduct 76 | `_ 77 | before contributing to help this project stay welcoming. 78 | -------------------------------------------------------------------------------- /ruff.toml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2024 Tim Cocks for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | target-version = "py38" 6 | line-length = 100 7 | 8 | [lint] 9 | preview = true 10 | select = ["I", "PL", "UP"] 11 | 12 | extend-select = [ 13 | "D419", # empty-docstring 14 | "E501", # line-too-long 15 | "W291", # trailing-whitespace 16 | "PLC0414", # useless-import-alias 17 | "PLC2401", # non-ascii-name 18 | "PLC2801", # unnecessary-dunder-call 19 | "PLC3002", # unnecessary-direct-lambda-call 20 | "PLE0101", # return-in-init 21 | "F706", # return-outside-function 22 | "F704", # yield-outside-function 23 | "PLE0116", # continue-in-finally 24 | "PLE0117", # nonlocal-without-binding 25 | "PLE0241", # duplicate-bases 26 | "PLE0302", # unexpected-special-method-signature 27 | "PLE0604", # invalid-all-object 28 | "PLE0605", # invalid-all-format 29 | "PLE0643", # potential-index-error 30 | "PLE0704", # misplaced-bare-raise 31 | "PLE1141", # dict-iter-missing-items 32 | "PLE1142", # await-outside-async 33 | "PLE1205", # logging-too-many-args 34 | "PLE1206", # logging-too-few-args 35 | "PLE1307", # bad-string-format-type 36 | "PLE1310", # bad-str-strip-call 37 | "PLE1507", # invalid-envvar-value 38 | "PLE2502", # bidirectional-unicode 39 | "PLE2510", # invalid-character-backspace 40 | "PLE2512", # invalid-character-sub 41 | "PLE2513", # invalid-character-esc 42 | "PLE2514", # invalid-character-nul 43 | "PLE2515", # invalid-character-zero-width-space 44 | "PLR0124", # comparison-with-itself 45 | "PLR0202", # no-classmethod-decorator 46 | "PLR0203", # no-staticmethod-decorator 47 | "UP004", # useless-object-inheritance 48 | "PLR0206", # property-with-parameters 49 | "PLR0904", # too-many-public-methods 50 | "PLR0911", # too-many-return-statements 51 | "PLR0912", # too-many-branches 52 | "PLR0913", # too-many-arguments 53 | "PLR0914", # too-many-locals 54 | "PLR0915", # too-many-statements 55 | "PLR0916", # too-many-boolean-expressions 56 | "PLR1702", # too-many-nested-blocks 57 | "PLR1704", # redefined-argument-from-local 58 | "PLR1711", # useless-return 59 | "C416", # unnecessary-comprehension 60 | "PLR1733", # unnecessary-dict-index-lookup 61 | "PLR1736", # unnecessary-list-index-lookup 62 | 63 | # ruff reports this rule is unstable 64 | #"PLR6301", # no-self-use 65 | 66 | "PLW0108", # unnecessary-lambda 67 | "PLW0120", # useless-else-on-loop 68 | "PLW0127", # self-assigning-variable 69 | "PLW0129", # assert-on-string-literal 70 | "B033", # duplicate-value 71 | "PLW0131", # named-expr-without-context 72 | "PLW0245", # super-without-brackets 73 | "PLW0406", # import-self 74 | "PLW0602", # global-variable-not-assigned 75 | "PLW0603", # global-statement 76 | "PLW0604", # global-at-module-level 77 | 78 | # fails on the try: import typing used by libraries 79 | #"F401", # unused-import 80 | 81 | "F841", # unused-variable 82 | "E722", # bare-except 83 | "PLW0711", # binary-op-exception 84 | "PLW1501", # bad-open-mode 85 | "PLW1508", # invalid-envvar-default 86 | "PLW1509", # subprocess-popen-preexec-fn 87 | "PLW2101", # useless-with-lock 88 | "PLW3301", # nested-min-max 89 | ] 90 | 91 | ignore = [ 92 | "PLR2004", # magic-value-comparison 93 | "UP030", # format literals 94 | "PLW1514", # unspecified-encoding 95 | "PLR0913", # too-many-arguments 96 | "PLR0915", # too-many-statements 97 | "PLR0917", # too-many-positional-arguments 98 | "PLR0904", # too-many-public-methods 99 | "PLR0912", # too-many-branches 100 | "PLR0916", # too-many-boolean-expressions 101 | "PLR6301", # could-be-static no-self-use 102 | "PLC0415", # import outside toplevel 103 | "PLC2701", # private import 104 | ] 105 | 106 | [format] 107 | line-ending = "lf" 108 | -------------------------------------------------------------------------------- /adafruit_bus_device/spi_device.py: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2016 Scott Shawcroft for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | """ 6 | `adafruit_bus_device.spi_device` - SPI Bus Device 7 | ==================================================== 8 | """ 9 | 10 | import time 11 | 12 | try: 13 | from types import TracebackType 14 | from typing import Optional, Type 15 | 16 | # Used only for type annotations. 17 | from busio import SPI 18 | from digitalio import DigitalInOut 19 | except ImportError: 20 | pass 21 | 22 | 23 | __version__ = "0.0.0+auto.0" 24 | __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_BusDevice.git" 25 | 26 | 27 | class SPIDevice: 28 | """ 29 | Represents a single SPI device and manages locking the bus and the device 30 | address. 31 | 32 | :param ~busio.SPI spi: The SPI bus the device is on 33 | :param ~digitalio.DigitalInOut chip_select: The chip select pin object that implements the 34 | DigitalInOut API. 35 | :param bool cs_active_value: Set to True if your device requires CS to be active high. 36 | Defaults to False. 37 | :param int baudrate: The desired SCK clock rate in Hertz. The actual clock rate may be 38 | higher or lower due to the granularity of available clock settings (MCU dependent). 39 | :param int polarity: The base state of the SCK clock pin (0 or 1). 40 | :param int phase: The edge of the clock that data is captured. First (0) or second (1). 41 | Rising or falling depends on SCK clock polarity. 42 | :param int extra_clocks: The minimum number of clock cycles to cycle the bus after CS is high. 43 | (Used for SD cards.) 44 | 45 | .. note:: This class is **NOT** built into CircuitPython. See 46 | :ref:`here for install instructions `. 47 | 48 | Example: 49 | 50 | .. code-block:: python 51 | 52 | import busio 53 | import digitalio 54 | from board import * 55 | from adafruit_bus_device.spi_device import SPIDevice 56 | 57 | with busio.SPI(SCK, MOSI, MISO) as spi_bus: 58 | cs = digitalio.DigitalInOut(D10) 59 | device = SPIDevice(spi_bus, cs) 60 | bytes_read = bytearray(4) 61 | # The object assigned to spi in the with statements below 62 | # is the original spi_bus object. We are using the busio.SPI 63 | # operations busio.SPI.readinto() and busio.SPI.write(). 64 | with device as spi: 65 | spi.readinto(bytes_read) 66 | # A second transaction 67 | with device as spi: 68 | spi.write(bytes_read) 69 | """ 70 | 71 | def __init__( 72 | self, 73 | spi: SPI, 74 | chip_select: Optional[DigitalInOut] = None, 75 | *, 76 | cs_active_value: bool = False, 77 | baudrate: int = 100000, 78 | polarity: int = 0, 79 | phase: int = 0, 80 | extra_clocks: int = 0, 81 | ) -> None: 82 | self.spi = spi 83 | self.baudrate = baudrate 84 | self.polarity = polarity 85 | self.phase = phase 86 | self.extra_clocks = extra_clocks 87 | self.chip_select = chip_select 88 | self.cs_active_value = cs_active_value 89 | if self.chip_select: 90 | self.chip_select.switch_to_output(value=not self.cs_active_value) 91 | 92 | def __enter__(self) -> SPI: 93 | while not self.spi.try_lock(): 94 | time.sleep(0) 95 | self.spi.configure(baudrate=self.baudrate, polarity=self.polarity, phase=self.phase) 96 | if self.chip_select: 97 | self.chip_select.value = self.cs_active_value 98 | return self.spi 99 | 100 | def __exit__( 101 | self, 102 | exc_type: Optional[Type[type]], 103 | exc_val: Optional[BaseException], 104 | exc_tb: Optional[TracebackType], 105 | ) -> bool: 106 | if self.chip_select: 107 | self.chip_select.value = not self.cs_active_value 108 | if self.extra_clocks > 0: 109 | buf = bytearray(1) 110 | buf[0] = 0xFF 111 | clocks = self.extra_clocks // 8 112 | if self.extra_clocks % 8 != 0: 113 | clocks += 1 114 | for _ in range(clocks): 115 | self.spi.write(buf) 116 | self.spi.unlock() 117 | return False 118 | -------------------------------------------------------------------------------- /docs/conf.py: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | import datetime 6 | import os 7 | import sys 8 | 9 | sys.path.insert(0, os.path.abspath("..")) 10 | 11 | # -- General configuration ------------------------------------------------ 12 | 13 | # Add any Sphinx extension module names here, as strings. They can be 14 | # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom 15 | # ones. 16 | extensions = [ 17 | "sphinx.ext.autodoc", 18 | "sphinxcontrib.jquery", 19 | "sphinx.ext.intersphinx", 20 | "sphinx.ext.viewcode", 21 | ] 22 | 23 | # Uncomment the below if you use native CircuitPython modules such as 24 | # digitalio, micropython and busio. List the modules you use. Without it, the 25 | # autodoc module docs will fail to generate with a warning. 26 | # autodoc_mock_imports = [] 27 | 28 | intersphinx_mapping = { 29 | "python": ("https://docs.python.org/3", None), 30 | "BusDevice": ( 31 | "https://docs.circuitpython.org/projects/busdevice/en/latest/", 32 | None, 33 | ), 34 | "CircuitPython": ("https://docs.circuitpython.org/en/latest/", None), 35 | } 36 | 37 | # Add any paths that contain templates here, relative to this directory. 38 | templates_path = ["_templates"] 39 | 40 | source_suffix = ".rst" 41 | 42 | # The master toctree document. 43 | master_doc = "index" 44 | 45 | # General information about the project. 46 | project = "Adafruit CircuitPython Bus Device" 47 | creation_year = "2016" 48 | current_year = str(datetime.datetime.now().year) 49 | year_duration = ( 50 | current_year if current_year == creation_year else creation_year + " - " + current_year 51 | ) 52 | copyright = year_duration + " Scott Shawcroft and Tony Dicola for Adafruit Industries" 53 | author = "Scott Shawcroft and Tony Dicola" 54 | 55 | # The version info for the project you're documenting, acts as replacement for 56 | # |version| and |release|, also used in various other places throughout the 57 | # built documents. 58 | # 59 | # The short X.Y version. 60 | version = "1.0" 61 | # The full version, including alpha/beta/rc tags. 62 | release = "1.0" 63 | 64 | # The language for content autogenerated by Sphinx. Refer to documentation 65 | # for a list of supported languages. 66 | # 67 | # This is also used if you do content translation via gettext catalogs. 68 | # Usually you set "language" from the command line for these cases. 69 | language = "en" 70 | 71 | # List of patterns, relative to source directory, that match files and 72 | # directories to ignore when looking for source files. 73 | # This patterns also effect to html_static_path and html_extra_path 74 | exclude_patterns = ["_build", "Thumbs.db", ".DS_Store", ".env", "CODE_OF_CONDUCT.md"] 75 | 76 | # The reST default role (used for this markup: `text`) to use for all 77 | # documents. 78 | # 79 | default_role = "any" 80 | 81 | # If true, '()' will be appended to :func: etc. cross-reference text. 82 | # 83 | add_function_parentheses = True 84 | 85 | # The name of the Pygments (syntax highlighting) style to use. 86 | pygments_style = "sphinx" 87 | 88 | # If true, `todo` and `todoList` produce output, else they produce nothing. 89 | todo_include_todos = False 90 | 91 | # If this is True, todo emits a warning for each TODO entries. The default is False. 92 | todo_emit_warnings = True 93 | 94 | 95 | # -- Options for HTML output ---------------------------------------------- 96 | 97 | # The theme to use for HTML and HTML Help pages. See the documentation for 98 | # a list of builtin themes. 99 | # 100 | import sphinx_rtd_theme 101 | 102 | html_theme = "sphinx_rtd_theme" 103 | 104 | # Add any paths that contain custom static files (such as style sheets) here, 105 | # relative to this directory. They are copied after the builtin static files, 106 | # so a file named "default.css" will overwrite the builtin "default.css". 107 | html_static_path = ["_static"] 108 | 109 | # Include extra css to work around rtd theme glitches 110 | html_css_files = ["custom.css"] 111 | 112 | # The name of an image file (relative to this directory) to use as a favicon of 113 | # the docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32 114 | # pixels large. 115 | # 116 | html_favicon = "_static/favicon.ico" 117 | 118 | # Output file base name for HTML help builder. 119 | htmlhelp_basename = "AdafruitBusDeviceLibrarydoc" 120 | 121 | # -- Options for LaTeX output --------------------------------------------- 122 | 123 | latex_elements = { 124 | # The paper size ('letterpaper' or 'a4paper'). 125 | # 126 | # 'papersize': 'letterpaper', 127 | # The font size ('10pt', '11pt' or '12pt'). 128 | # 129 | # 'pointsize': '10pt', 130 | # Additional stuff for the LaTeX preamble. 131 | # 132 | # 'preamble': '', 133 | # Latex figure (float) alignment 134 | # 135 | # 'figure_align': 'htbp', 136 | } 137 | 138 | # Grouping the document tree into LaTeX files. List of tuples 139 | # (source start file, target name, title, 140 | # author, documentclass [howto, manual, or own class]). 141 | latex_documents = [ 142 | ( 143 | master_doc, 144 | "AdafruitBusDeviceLibrary.tex", 145 | "Adafruit Bus Device Library Documentation", 146 | author, 147 | "manual", 148 | ), 149 | ] 150 | 151 | # -- Options for manual page output --------------------------------------- 152 | 153 | # One entry per manual page. List of tuples 154 | # (source start file, name, description, authors, manual section). 155 | man_pages = [ 156 | ( 157 | master_doc, 158 | "AdafruitBusDeviceLibrary", 159 | "Adafruit Bus Device Library Documentation", 160 | [author], 161 | 1, 162 | ) 163 | ] 164 | 165 | # -- Options for Texinfo output ------------------------------------------- 166 | 167 | # Grouping the document tree into Texinfo files. List of tuples 168 | # (source start file, target name, title, author, 169 | # dir menu entry, description, category) 170 | texinfo_documents = [ 171 | ( 172 | master_doc, 173 | "AdafruitBusDeviceLibrary", 174 | "Adafruit Bus Device Library Documentation", 175 | author, 176 | "AdafruitBusDeviceLibrary", 177 | "One line description of project.", 178 | "Miscellaneous", 179 | ), 180 | ] 181 | -------------------------------------------------------------------------------- /CODE_OF_CONDUCT.md: -------------------------------------------------------------------------------- 1 | 6 | 7 | # Adafruit Community Code of Conduct 8 | 9 | ## Our Pledge 10 | 11 | In the interest of fostering an open and welcoming environment, we as 12 | contributors and leaders pledge to making participation in our project and 13 | our community a harassment-free experience for everyone, regardless of age, body 14 | size, disability, ethnicity, gender identity and expression, level or type of 15 | experience, education, socio-economic status, nationality, personal appearance, 16 | race, religion, or sexual identity and orientation. 17 | 18 | ## Our Standards 19 | 20 | We are committed to providing a friendly, safe and welcoming environment for 21 | all. 22 | 23 | Examples of behavior that contributes to creating a positive environment 24 | include: 25 | 26 | * Be kind and courteous to others 27 | * Using welcoming and inclusive language 28 | * Being respectful of differing viewpoints and experiences 29 | * Collaborating with other community members 30 | * Gracefully accepting constructive criticism 31 | * Focusing on what is best for the community 32 | * Showing empathy towards other community members 33 | 34 | Examples of unacceptable behavior by participants include: 35 | 36 | * The use of sexualized language or imagery and sexual attention or advances 37 | * The use of inappropriate images, including in a community member's avatar 38 | * The use of inappropriate language, including in a community member's nickname 39 | * Any spamming, flaming, baiting or other attention-stealing behavior 40 | * Excessive or unwelcome helping; answering outside the scope of the question 41 | asked 42 | * Trolling, insulting/derogatory comments, and personal or political attacks 43 | * Promoting or spreading disinformation, lies, or conspiracy theories against 44 | a person, group, organisation, project, or community 45 | * Public or private harassment 46 | * Publishing others' private information, such as a physical or electronic 47 | address, without explicit permission 48 | * Other conduct which could reasonably be considered inappropriate 49 | 50 | The goal of the standards and moderation guidelines outlined here is to build 51 | and maintain a respectful community. 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This includes but is not limited to any community 114 | spaces (both public and private), the entire Adafruit Discord server, and 115 | Adafruit GitHub repositories. Examples of Adafruit Community spaces include 116 | but are not limited to meet-ups, audio chats on the Adafruit Discord, or 117 | interaction at a conference. 118 | 119 | This Code of Conduct applies both within project spaces and in public spaces 120 | when an individual is representing the project or its community. As a community 121 | member, you are representing our community, and are expected to behave 122 | accordingly. 123 | 124 | ## Attribution 125 | 126 | This Code of Conduct is adapted from the [Contributor Covenant][homepage], 127 | version 1.4, available at 128 | , 129 | and the [Rust Code of Conduct](https://www.rust-lang.org/en-US/conduct.html). 130 | 131 | For other projects adopting the Adafruit Community Code of 132 | Conduct, please contact the maintainers of those projects for enforcement. 133 | If you wish to use this code of conduct for your own project, consider 134 | explicitly mentioning your moderation policy or making a copy with your 135 | own moderation policy so as to avoid confusion. 136 | -------------------------------------------------------------------------------- /adafruit_bus_device/i2c_device.py: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2016 Scott Shawcroft for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | """ 6 | `adafruit_bus_device.i2c_device` - I2C Bus Device 7 | ==================================================== 8 | """ 9 | 10 | import time 11 | 12 | try: 13 | from types import TracebackType 14 | from typing import Optional, Type 15 | 16 | # Used only for type annotations. 17 | from busio import I2C 18 | from circuitpython_typing import ReadableBuffer, WriteableBuffer 19 | except ImportError: 20 | pass 21 | 22 | 23 | __version__ = "0.0.0+auto.0" 24 | __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_BusDevice.git" 25 | 26 | 27 | class I2CDevice: 28 | """ 29 | Represents a single I2C device and manages locking the bus and the device 30 | address. 31 | 32 | :param ~busio.I2C i2c: The I2C bus the device is on 33 | :param int device_address: The 7 bit device address 34 | :param bool probe: Probe for the device upon object creation, default is true 35 | 36 | .. note:: This class is **NOT** built into CircuitPython. See 37 | :ref:`here for install instructions `. 38 | 39 | Example: 40 | 41 | .. code-block:: python 42 | 43 | import busio 44 | from board import * 45 | from adafruit_bus_device.i2c_device import I2CDevice 46 | 47 | with busio.I2C(SCL, SDA) as i2c: 48 | device = I2CDevice(i2c, 0x70) 49 | bytes_read = bytearray(4) 50 | with device: 51 | device.readinto(bytes_read) 52 | # A second transaction 53 | with device: 54 | device.write(bytes_read) 55 | """ 56 | 57 | def __init__(self, i2c: I2C, device_address: int, probe: bool = True) -> None: 58 | self.i2c = i2c 59 | self.device_address = device_address 60 | 61 | if probe: 62 | self.__probe_for_device() 63 | 64 | def readinto(self, buf: WriteableBuffer, *, start: int = 0, end: Optional[int] = None) -> None: 65 | """ 66 | Read into ``buf`` from the device. The number of bytes read will be the 67 | length of ``buf``. 68 | 69 | If ``start`` or ``end`` is provided, then the buffer will be sliced 70 | as if ``buf[start:end]``. This will not cause an allocation like 71 | ``buf[start:end]`` will so it saves memory. 72 | 73 | :param ~WriteableBuffer buffer: buffer to write into 74 | :param int start: Index to start writing at 75 | :param int end: Index to write up to but not include; if None, use ``len(buf)`` 76 | """ 77 | if end is None: 78 | end = len(buf) 79 | self.i2c.readfrom_into(self.device_address, buf, start=start, end=end) 80 | 81 | def write(self, buf: ReadableBuffer, *, start: int = 0, end: Optional[int] = None) -> None: 82 | """ 83 | Write the bytes from ``buffer`` to the device, then transmit a stop 84 | bit. 85 | 86 | If ``start`` or ``end`` is provided, then the buffer will be sliced 87 | as if ``buffer[start:end]``. This will not cause an allocation like 88 | ``buffer[start:end]`` will so it saves memory. 89 | 90 | :param ~ReadableBuffer buffer: buffer containing the bytes to write 91 | :param int start: Index to start writing from 92 | :param int end: Index to read up to but not include; if None, use ``len(buf)`` 93 | """ 94 | if end is None: 95 | end = len(buf) 96 | self.i2c.writeto(self.device_address, buf, start=start, end=end) 97 | 98 | def write_then_readinto( 99 | self, 100 | out_buffer: ReadableBuffer, 101 | in_buffer: WriteableBuffer, 102 | *, 103 | out_start: int = 0, 104 | out_end: Optional[int] = None, 105 | in_start: int = 0, 106 | in_end: Optional[int] = None, 107 | ) -> None: 108 | """ 109 | Write the bytes from ``out_buffer`` to the device, then immediately 110 | reads into ``in_buffer`` from the device. The number of bytes read 111 | will be the length of ``in_buffer``. 112 | 113 | If ``out_start`` or ``out_end`` is provided, then the output buffer 114 | will be sliced as if ``out_buffer[out_start:out_end]``. This will 115 | not cause an allocation like ``buffer[out_start:out_end]`` will so 116 | it saves memory. 117 | 118 | If ``in_start`` or ``in_end`` is provided, then the input buffer 119 | will be sliced as if ``in_buffer[in_start:in_end]``. This will not 120 | cause an allocation like ``in_buffer[in_start:in_end]`` will so 121 | it saves memory. 122 | 123 | :param ~ReadableBuffer out_buffer: buffer containing the bytes to write 124 | :param ~WriteableBuffer in_buffer: buffer containing the bytes to read into 125 | :param int out_start: Index to start writing from 126 | :param int out_end: Index to read up to but not include; if None, use ``len(out_buffer)`` 127 | :param int in_start: Index to start writing at 128 | :param int in_end: Index to write up to but not include; if None, use ``len(in_buffer)`` 129 | """ 130 | if out_end is None: 131 | out_end = len(out_buffer) 132 | if in_end is None: 133 | in_end = len(in_buffer) 134 | 135 | self.i2c.writeto_then_readfrom( 136 | self.device_address, 137 | out_buffer, 138 | in_buffer, 139 | out_start=out_start, 140 | out_end=out_end, 141 | in_start=in_start, 142 | in_end=in_end, 143 | ) 144 | 145 | def __enter__(self) -> "I2CDevice": 146 | while not self.i2c.try_lock(): 147 | time.sleep(0) 148 | return self 149 | 150 | def __exit__( 151 | self, 152 | exc_type: Optional[Type[type]], 153 | exc_val: Optional[BaseException], 154 | exc_tb: Optional[TracebackType], 155 | ) -> bool: 156 | self.i2c.unlock() 157 | return False 158 | 159 | def __probe_for_device(self) -> None: 160 | """ 161 | Try to read a byte from an address, 162 | if you get an OSError it means the device is not there 163 | or that the device does not support these means of probing 164 | """ 165 | while not self.i2c.try_lock(): 166 | time.sleep(0) 167 | try: 168 | self.i2c.writeto(self.device_address, b"") 169 | except OSError: 170 | # some OS's dont like writing an empty bytesting... 171 | # Retry by reading a byte 172 | try: 173 | result = bytearray(1) 174 | self.i2c.readfrom_into(self.device_address, result) 175 | except OSError: 176 | raise ValueError("No I2C device at address: 0x%x" % self.device_address) 177 | finally: 178 | self.i2c.unlock() 179 | -------------------------------------------------------------------------------- /LICENSES/CC-BY-4.0.txt: -------------------------------------------------------------------------------- 1 | Creative Commons Attribution 4.0 International Creative Commons Corporation 2 | ("Creative Commons") is not a law firm and does not provide legal services 3 | or legal advice. 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