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#![deny(missing_docs)]
#[macro_use]
extern crate failure;
extern crate serial;
mod error;
pub mod mock;
#[cfg(test)]
mod tests;
pub use error::*;
use serial::prelude::*;
use std::cell::RefCell;
use std::io::prelude::*;
use std::time::Duration;
pub struct Connection {
pub stream: Box<Stream>,
}
impl Connection {
pub fn new(stream: Box<Stream>) -> Connection {
Connection { stream }
}
pub fn from_path(
bus: &str,
settings: serial::PortSettings,
timeout: Duration,
) -> UartResult<Connection> {
Ok(Connection {
stream: Box::new(SerialStream::new(bus, settings, timeout)?),
})
}
pub fn write(&self, data: &[u8]) -> UartResult<()> {
self.stream.write(data)
}
pub fn read(&self, len: usize, timeout: Duration) -> UartResult<Vec<u8>> {
self.stream.read(len, timeout)
}
}
pub trait Stream: Send {
fn write(&self, data: &[u8]) -> UartResult<()>;
fn read(&self, len: usize, timeout: Duration) -> UartResult<Vec<u8>>;
}
struct SerialStream {
port: RefCell<serial::SystemPort>,
timeout: Duration,
}
impl SerialStream {
fn new(bus: &str, settings: serial::PortSettings, timeout: Duration) -> UartResult<Self> {
let mut port = serial::open(bus)?;
port.configure(&settings)?;
Ok(SerialStream {
port: RefCell::new(port),
timeout,
})
}
}
impl Stream for SerialStream {
fn write(&self, data: &[u8]) -> UartResult<()> {
let mut port = self.port.try_borrow_mut().map_err(|_| UartError::PortBusy)?;
port.set_timeout(self.timeout)?;
port.write_all(data)?;
Ok(())
}
fn read(&self, len: usize, timeout: Duration) -> UartResult<Vec<u8>> {
let mut port = self.port.try_borrow_mut().map_err(|_| UartError::PortBusy)?;
port.set_timeout(timeout)?;
let mut response: Vec<u8> = vec![0; len];
port.read_exact(response.as_mut_slice())?;
Ok(response)
}
}