1 use std::io::{self, Write};
2 use std::time::Duration;
3
4 use clap::{Arg, Command};
5
main()6 fn main() {
7 let matches = Command::new("Serialport Example - Receive Data")
8 .about("Reads data from a serial port and echoes it to stdout")
9 .disable_version_flag(true)
10 .arg(
11 Arg::new("port")
12 .help("The device path to a serial port")
13 .use_value_delimiter(false)
14 .required(true),
15 )
16 .arg(
17 Arg::new("baud")
18 .help("The baud rate to connect at")
19 .use_value_delimiter(false)
20 .required(true)
21 .validator(valid_baud),
22 )
23 .get_matches();
24
25 let port_name = matches.value_of("port").unwrap();
26 let baud_rate = matches.value_of("baud").unwrap().parse::<u32>().unwrap();
27
28 let port = serialport::new(port_name, baud_rate)
29 .timeout(Duration::from_millis(10))
30 .open();
31
32 match port {
33 Ok(mut port) => {
34 let mut serial_buf: Vec<u8> = vec![0; 1000];
35 println!("Receiving data on {} at {} baud:", &port_name, &baud_rate);
36 loop {
37 match port.read(serial_buf.as_mut_slice()) {
38 Ok(t) => {
39 io::stdout().write_all(&serial_buf[..t]).unwrap();
40 io::stdout().flush().unwrap();
41 }
42 Err(ref e) if e.kind() == io::ErrorKind::TimedOut => (),
43 Err(e) => eprintln!("{:?}", e),
44 }
45 }
46 }
47 Err(e) => {
48 eprintln!("Failed to open \"{}\". Error: {}", port_name, e);
49 ::std::process::exit(1);
50 }
51 }
52 }
53
valid_baud(val: &str) -> Result<(), String>54 fn valid_baud(val: &str) -> Result<(), String> {
55 val.parse::<u32>()
56 .map(|_| ())
57 .map_err(|_| format!("Invalid baud rate '{}' specified", val))
58 }
59