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MCP2221-RS
2022-09-21
3 years
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MCP2221-rs
This library allows your code to control an MCP2221 or MCP2221A over USB for the purposes of talking I2C or using the GPIO pins. It doesn't support the UART feature of the MCP2221 although PRs are welcome.
I2C traits from the embedded-hal are used, allowing relatively easy switching between this I2C interface and something like linux-embedded-hal for devices that are supported directly by the kernel.
This library has only been tested on Linux, but it uses rusb to access the USB bus and that supports other platforms, so there's a moderate chance it will work on more than just Linux.
Example
See examples/scan_bus.rs.
Granting access to the device
In order to allow access to the USB device, it's recommended to create a udev
rule. e.g. create /etc/udev/rules.d/71-mcp.rules with the following content:
SUBSYSTEM=="usb", ATTRS{idVendor}=="04d8", ATTRS{idProduct}=="00dd", GROUP="plugdev", TAG+="uaccess"
This rule allows access to the device by the user physically logged into the computer (uaccess) and to anyone in the plugdev group.
Contributing
See docs/contributing.md.
Disclaimer
This is not an officially supported Google product.
License
This project is licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)
at your option.
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Reviews
1
(1)
user_NFo9RIfr
2025-04-17
The MCP2221-RS by Google is an exceptional tool for developers. This product offers seamless communication with the MCP2221 USB to UART/I2C converter, making it a breeze to integrate into projects. The documentation is thorough, and the support from Google ensures reliability and ease of use. Whether you're working on simple or complex projects, this library is a great asset for anyone using MCP2221. Highly recommended!