Platform agnostic driver for the PCF8574, PCF8574A and PCF8575 I/O expanders written in Rust using embedded-hal
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README.md

README.md

Rust PCF857x I/O Expanders Driver crates.io Docs

This is a platform agnostic Rust driver for the PCF8574, PCF8574A and PCF8575 I/O expanders, based on the embedded-hal traits.

This driver allows you to:

  • Set all the outputs to 0 or 1 at once.
  • Read selected inputs.
  • Set all the outputs repeatedly looping through an array.
  • Read selected inputs repeatedly filling up an array.
  • Split the device into individual output pins.

The devices

The devices consist of 8 or 16 quasi-bidirectional ports, I²C-bus interface, three hardware address inputs and interrupt output. The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads, or as an output to activate indicator devices such as LEDs.

The active LOW open-drain interrupt output (INT) can be connected to the interrupt logic of the microcontroller and is activated when any input state differs from its corresponding input port register state.

Datasheets:

License

Licensed under either of

Contributing

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.