Crate gpiochip

The gpiochip crate provides access to Linux gpiochip devices from rust. The interface is wrapped, so that rust types are being used instead of C types.

Examples

extern crate gpiochip as gpio;

/// Print information about first gpiochip
fn main() {
    let chip = gpio::GpioChip::new("/dev/gpiochip0").unwrap();

    println!("GPIOChip 0:");
    println!(" Name:  {:?}", chip.name);
    println!(" Label: {:?}", chip.label);
    println!(" Lines: {:?}", chip.lines);
    println!("");

    for i in 0..chip.lines {
        let info = chip.info(i).unwrap();

        println!(" GPIO {:?}: {:?}", info.gpio, info.name);
        println!("     Consumer: {:?}", info.consumer);
        println!("     Flags: {:?}", info.flags);
    }
}

extern crate gpiochip as gpio;

/// Simple get/set example
fn main() {
    let chip = gpio::GpioChip::new("/dev/gpiochip0").unwrap();
    let gpio_a = chip.request("gpioA", gpio::RequestFlags::INPUT, 0, 0).unwrap();
    let gpio_b = chip.request("gpioA", gpio::RequestFlags::OUTPUT | gpio::RequestFlags::ACTIVE_LOW, 1, 0).unwrap();

    let val = gpio_a.get().unwrap();
    gpio_b.set(val).unwrap();
}

extern crate gpiochip as gpio;

/// GPIO events
fn main() {
    let chip = gpio::GpioChip::new("/dev/gpiochip0").unwrap();

    let gpio_a = chip.request_event("gpioA", 0, gpio::RequestFlags::INPUT, gpio::EventRequestFlags::BOTH_EDGES).unwrap();
    let gpio_b = chip.request_event("gpioB", 1, gpio::RequestFlags::INPUT, gpio::EventRequestFlags::BOTH_EDGES).unwrap();

    let bitmap = gpio::wait_for_event(&[&gpio_a, &gpio_b], 1000).unwrap();

    if bitmap & 0b01 == 0b01 {
        let event = gpio_a.read().unwrap();
        println!("gpioA: event @ {:?} - {:?}", event.timestamp, event.id);
    }

    if bitmap & 0b10 == 0b10 {
        let event = gpio_b.read().unwrap();
        println!("gpioB: event @ {:?} - {:?}", event.timestamp, event.id);
    }
}

Structs

EventRequestFlags	bitflag describing the events, that should generate a GpioEvent the GpioEventHandle
Flags	bitflag describing the current gpio mode
GpioArrayHandle	A GPIO array handle acquired from the gpiochip
GpioChip	Provide high-level access to Linux gpiochip Driver
GpioEvent	A GPIO event received from a GpioEventHandle
GpioEventHandle	A GPIO event handle acquired from the gpiochip
GpioHandle	A GPIO handle acquired from the gpiochip
LineInfo	Data returned by GpioChip::info()
RequestFlags	bitflag describing the gpio mode, that should be requested

Enums

EventId

Functions

wait_for_event

Wait until at least one gpio event has been received or timeout occured.