k8055 0.2.3

Rust support for the Vellemann K8055 USB IO Card
Documentation 
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extern crate k8055;
extern crate libusb;
use k8055::K8055;

fn main() {
    if let Ok(mut ctx) = libusb::Context::new() {
        {
            match K8055::new(&mut ctx) {
                Ok(ref mut k) => {
                    k.open();
                    let mut n = 10;
                    let mut old = k8055::DigitalChannel::DZERO;
                    loop {
                        if n == 0 {
                            break;
                        }
                        let new = k.read_digital_in().unwrap();
                        if new != old {
                            old = new;
                            k.write_digital_out(new).expect("Error writing DO");
                            n -= 1;
                        }
                    }
                }
                Err(e) => panic!("Error: {}", e),
            }
        }
    }
}