Crate gpiocdev

Expand description

A library for accessing GPIO lines on Linux platforms using the GPIO character device.

Lines are requested and manipulated using the request module.

The lines available on specific chips can be discovered using the chip module.

The lines available on the system can be discovered by name using the find_named_line and find_named_lines functions, or using the iterator returned by lines.

Example Usage

Request an input line and output line, and read from the input and change the output to that value:

use gpiocdev::request::Request;
use gpiocdev::line::{Bias, Value};

let req = Request::builder()
    .on_chip("/dev/gpiochip0")
    .with_line(3)
    .as_input()
    .with_bias(Bias::PullUp)
    .with_line(4)
    .as_output(Value::Inactive)
    .request()?;
let value = req.value(3)?;
req.set_value(4, value)?;

Monitor a line for debounced edges:

use gpiocdev::request::Request;
use gpiocdev::line::EdgeDetection;
use std::time::Duration;

let req = Request::builder()
    .on_chip("/dev/gpiochip0")
    .with_line(5)
    .with_edge_detection(EdgeDetection::BothEdges)
    .with_debounce_period(Duration::from_millis(5))
    .request()?;
for edge in req.edge_events() {
    println!("{:?}", edge);
}