read write serialport example

main.rs

use std::env;
use std::io;
use std::path::Path;
use std::time::Duration;

extern crate serial;
use serial::prelude::*;

/// e.g. cargo run /dev/ttyUSB3 echo
fn main() {
    let args: Vec<String> = env::args().collect();
    println!("target: {:?}, cmd: {:?}", args.get(1), args.get(2));
    let mut port = serial_unix::TTYPort::open(Path::new(args.get(1).unwrap())).unwrap();
    interact(&mut port, args.get(2).unwrap()).unwrap();
}

fn interact<T: SerialPort>(port: &mut T, cmd: &str) -> io::Result<()> {
    // Deviceに合わせる
    port.reconfigure(&|settings| {
        settings.set_baud_rate(serial::Baud115200)?;
        settings.set_char_size(serial::Bits8);
        settings.set_parity(serial::ParityNone);
        settings.set_stop_bits(serial::Stop1);
        settings.set_flow_control(serial::FlowHardware);
        Ok(())
    })?;
    port.set_timeout(Duration::from_millis(1000))?;

    port.write(&cmd.as_bytes())?;

    // TODO 1024より長いケースのフォロー
    let mut buf = [0; 1024];
    let size = port.read(&mut buf)?;
    match size {
        0 => {
            println!("no response");
        }
        x => {
            println!("result:\n{}", std::str::from_utf8(&buf[0..x]).unwrap());
        }
    }
    Ok(())
}