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pub extern crate lin_bus;
pub extern crate serial;
use lin_bus::{driver, PID};
use serial::{SerialPort, SystemPort};
use std::io::{Read, Write};
use std::thread::sleep;
use std::time::Duration;
pub struct SerialLin(pub SystemPort);
#[derive(Debug)]
pub enum SerialError {
LinError(driver::Error),
SerialError(serial::Error),
}
impl From<serial::Error> for SerialError {
fn from(error: serial::Error) -> SerialError {
SerialError::SerialError(error)
}
}
impl From<SerialError> for driver::Error {
fn from(error: SerialError) -> driver::Error {
match error {
SerialError::LinError(lin_error) => lin_error,
SerialError::SerialError(ser_error) => match ser_error.kind() {
serial::ErrorKind::Io(std::io::ErrorKind::TimedOut) => driver::Error::Timeout,
_ => driver::Error::PhysicalBus,
},
}
}
}
impl From<driver::Error> for SerialError {
fn from(error: driver::Error) -> SerialError {
SerialError::LinError(error)
}
}
impl From<std::io::Error> for SerialError {
fn from(error: std::io::Error) -> SerialError {
SerialError::SerialError(serial::Error::from(error))
}
}
impl driver::Master for SerialLin {
type Error = SerialError;
fn send_wakeup(&mut self) -> Result<(), SerialError> {
self.0.set_timeout(Duration::from_millis(1000))?;
self.0.reconfigure(&|settings| {
settings.set_baud_rate(serial::Baud9600)?;
settings.set_char_size(serial::Bits7);
settings.set_parity(serial::ParityNone);
settings.set_stop_bits(serial::Stop1);
settings.set_flow_control(serial::FlowNone);
Ok(())
})?;
self.0.write(&[0])?;
let mut buf = [0; 1];
self.0.read_exact(&mut buf)?;
if buf[0] != 0 {
Err(SerialError::LinError(driver::Error::PhysicalBus))
} else {
sleep(Duration::from_millis(100));
Ok(())
}
}
fn send_header(&mut self, pid: PID) -> Result<(), SerialError> {
self.0.set_timeout(Duration::from_millis(1000))?;
self.0.reconfigure(&|settings| {
settings.set_baud_rate(serial::Baud9600)?;
settings.set_char_size(serial::Bits7);
settings.set_parity(serial::ParityNone);
settings.set_stop_bits(serial::Stop1);
settings.set_flow_control(serial::FlowNone);
Ok(())
})?;
self.0.write(&[0])?;
sleep(Duration::from_millis(1));
self.0.reconfigure(&|settings| {
settings.set_baud_rate(serial::Baud19200)?;
settings.set_char_size(serial::Bits8);
settings.set_parity(serial::ParityNone);
settings.set_stop_bits(serial::Stop1);
settings.set_flow_control(serial::FlowNone);
Ok(())
})?;
self.0.write(&[0x55, pid.get()])?;
let mut buf = [0; 2];
self.0.read_exact(&mut buf)?;
if buf != [0x55, pid.get()] {
Err(SerialError::LinError(driver::Error::PhysicalBus))
} else {
Ok(())
}
}
fn read(&mut self, buf: &mut [u8]) -> Result<(), SerialError> {
self.0.read_exact(buf)?;
Ok(())
}
fn write(&mut self, data: &[u8]) -> Result<(), SerialError> {
assert!(
data.len() <= 9,
"Data must be at most 8 bytes + 1 checksum byte"
);
self.0.write(data)?;
let mut buf = [0; 9];
self.0.read_exact(&mut buf[0..data.len()])?;
if &buf[0..data.len()] != data {
Err(SerialError::LinError(driver::Error::PhysicalBus))
} else {
Ok(())
}
}
}
#[cfg(test)]
mod tests {
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
}