obd2/src/interface.rs

131 lines
3.5 KiB
Rust

use log::{debug, trace};
use super::{device::Obd2BaseDevice, Error, Obd2Device, Result};
/// An OBD-II interface
///
/// Wraps an implementer of [Obd2BaseDevice] to allow for higher-level usage of the OBD-II
/// interface.
pub struct Obd2<T: Obd2BaseDevice> {
device: T,
}
impl<T: Obd2BaseDevice> Obd2Device for Obd2<T> {
fn obd_command(&mut self, mode: u8, pid: u8) -> Result<Vec<Vec<u8>>> {
let result = self.command(&[mode, pid])?;
for response in result.iter() {
if response.first() != Some(&(0x40 | mode)) {
todo!()
}
if response.get(1) != Some(&pid) {
todo!()
}
}
Ok(result.iter().map(|l| l.split_at(2).1.to_vec()).collect())
}
fn obd_mode_command(&mut self, mode: u8) -> Result<Vec<Vec<u8>>> {
let result = self.command(std::slice::from_ref(&mode))?;
for response in result.iter() {
if response.first() != Some(&(0x40 | mode)) {
todo!()
}
}
Ok(result.iter().map(|l| l.split_at(1).1.to_vec()).collect())
}
}
impl<T: Obd2BaseDevice> Obd2<T> {
pub fn new(dev: T) -> ::anyhow::Result<Self> {
let mut device = Obd2 {
device: dev
};
Ok(device)
}
pub fn reset(&mut self) -> Result<()> {
Ok(self.device.reset()?)
}
fn command(&mut self, command: &[u8]) -> Result<Vec<Vec<u8>>> {
let response = self
.device
.cmd(command)?
.ok_or(Error::Other("no response to command".to_owned()))?;
trace!(
"Sent OBD command {:?} and got response {:?}",
command,
response
);
let data = if response.contains("0:") {
vec![self.parse_command_multiline(response)?]
} else {
self.parse_command(response)?
};
debug!("Sent OBD command {:?} and got data {:?}", command, data);
let result = data
.iter()
.map(|l| {
l.iter()
.map(|s| u8::from_str_radix(s, 16).map_err(|e| e.into()))
.collect()
})
.collect();
result
}
fn parse_command(&mut self, response: String) -> Result<Vec<Vec<String>>> {
let result: Vec<_> = response
.split('\n')
.filter_map(|l| {
let res: Vec<_> = l
.split(' ')
.filter_map(|s| {
if !s.is_empty() {
Some(s.to_owned())
} else {
None
}
})
.collect();
if !res.is_empty() {
Some(res)
} else {
None
}
})
.collect();
if !result.is_empty() {
Ok(result)
} else {
Err(Error::Other("parse_command: found no responses".to_owned()))
}
}
fn parse_command_multiline(&mut self, response: String) -> Result<Vec<String>> {
let mut n_idx = 0;
Ok(response
.split('\n')
.filter_map(|l| l.split_once(':'))
.flat_map(|(idx, data)| {
if u8::from_str_radix(idx, 16) != Ok(n_idx) {
todo!()
}
n_idx = (n_idx + 1) % 0x10;
data.split_whitespace().map(|s| s.to_owned())
})
.collect())
}
}