Basic SerialPort wrapper

No real functionality, just a basic version info check to make sure that
the device being communicated with is actually the RN2903.
This commit is contained in:
Leonora Tindall 2019-12-28 08:29:09 -08:00
commit 8891b8b6bf
Signed by: nora
GPG Key ID: 7A8B52EC67E09AAF
5 changed files with 346 additions and 0 deletions

2
.gitignore vendored Normal file
View File

@ -0,0 +1,2 @@
/target
**/*.rs.bk

212
Cargo.lock generated Normal file
View File

@ -0,0 +1,212 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "CoreFoundation-sys"
version = "0.1.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
"mach 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "IOKit-sys"
version = "0.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"CoreFoundation-sys 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
"mach 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "aho-corasick"
version = "0.7.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "bitflags"
version = "1.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "cc"
version = "1.0.48"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "cfg-if"
version = "0.1.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "lazy_static"
version = "1.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "libc"
version = "0.2.66"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "libudev"
version = "0.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
"libudev-sys 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "libudev-sys"
version = "0.1.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
"pkg-config 0.3.17 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "mach"
version = "0.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "mach"
version = "0.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "memchr"
version = "2.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "nix"
version = "0.14.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"cc 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)",
"cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
"void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "pkg-config"
version = "0.3.17"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "quick-error"
version = "1.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "regex"
version = "1.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"aho-corasick 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
"memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
"thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "regex-syntax"
version = "0.6.12"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "rn2903"
version = "0.1.0"
dependencies = [
"quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
"serialport 3.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "serialport"
version = "3.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"CoreFoundation-sys 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
"IOKit-sys 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
"bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
"libudev 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
"mach 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
"nix 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)",
"regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "thread_local"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "void"
version = "1.0.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "winapi"
version = "0.3.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "winapi-i686-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "winapi-x86_64-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[metadata]
"checksum CoreFoundation-sys 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d0e9889e6db118d49d88d84728d0e964d973a5680befb5f85f55141beea5c20b"
"checksum IOKit-sys 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "99696c398cbaf669d2368076bdb3d627fb0ce51a26899d7c61228c5c0af3bf4a"
"checksum aho-corasick 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)" = "58fb5e95d83b38284460a5fda7d6470aa0b8844d283a0b614b8535e880800d2d"
"checksum bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
"checksum cc 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)" = "f52a465a666ca3d838ebbf08b241383421412fe7ebb463527bba275526d89f76"
"checksum cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
"checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
"checksum libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)" = "d515b1f41455adea1313a4a2ac8a8a477634fbae63cc6100e3aebb207ce61558"
"checksum libudev 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ea626d3bdf40a1c5aee3bcd4f40826970cae8d80a8fec934c82a63840094dcfe"
"checksum libudev-sys 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3c8469b4a23b962c1396b9b451dda50ef5b283e8dd309d69033475fa9b334324"
"checksum mach 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2fd13ee2dd61cc82833ba05ade5a30bb3d63f7ced605ef827063c63078302de9"
"checksum mach 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "86dd2487cdfea56def77b88438a2c915fb45113c5319bfe7e14306ca4cd0b0e1"
"checksum memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "88579771288728879b57485cc7d6b07d648c9f0141eb955f8ab7f9d45394468e"
"checksum nix 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6c722bee1037d430d0f8e687bbdbf222f27cc6e4e68d5caf630857bb2b6dbdce"
"checksum pkg-config 0.3.17 (registry+https://github.com/rust-lang/crates.io-index)" = "05da548ad6865900e60eaba7f589cc0783590a92e940c26953ff81ddbab2d677"
"checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
"checksum regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dc220bd33bdce8f093101afe22a037b8eb0e5af33592e6a9caafff0d4cb81cbd"
"checksum regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)" = "11a7e20d1cce64ef2fed88b66d347f88bd9babb82845b2b858f3edbf59a4f716"
"checksum serialport 3.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5b8d3ecaf58010bedccae17be55d4ed6f2ecde5646fc48ce8c66ea2d35a1419c"
"checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
"checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
"checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"

10
Cargo.toml Normal file
View File

@ -0,0 +1,10 @@
[package]
name = "rn2903"
version = "0.1.0"
authors = ["Leonora Tindall <nora@nora.codes>"]
edition = "2018"
[dependencies]
serialport = "3.3"
quick-error = "1"

116
src/lib.rs Normal file
View File

@ -0,0 +1,116 @@
// One of the critical aspects of this library is error handling. Because it is intended
// to communicate with an external device, any operation could discover a disconnection
// from the RN2903 serial link, so everything which does such communication will return
// a `Result<T, rn2903::Error>`.
#[macro_use] extern crate quick_error;
use std::io;
quick_error! {
#[derive(Debug)]
pub enum Error {
/// The connection to the RN2903 was impossible for some reason. Perhaps an
/// invalid port was specified, or this program does not have permission to
/// access the specified port.
ConnectionFailed(err: serialport::Error) {
cause(err)
description(err.description())
from()
}
/// The device to which the serial link is connected does not appear to be
/// a RN2903, because it did not respond to `sys get ver` correctly.
WrongDevice(version: String) {
description("failed to verify connected module")
display("Could not verify version string. Expected a RN2903 firmware revision, got '{}'",
version)
}
/// The program has become disconnected from the RN2903 module due to an I/O
/// error. It is possible the device was physically disconnected, or that the
/// host operating system closed the serial port for some reason.
Disconnected(err: io::Error) {
cause(err)
description(err.description())
from()
}
}
}
/// Universal `Result` wrapper for the RN2903 interface.
type Result<T> = std::result::Result<T, Error>;
// It's first necessary to actually connect to the module. To this end, the library
// exports all the configuration information needed to configure a serial port to
// communicate correctly with an RN2903.
use serialport::prelude::*;
use std::io::prelude::*;
use core::convert::AsRef;
use std::ffi::OsStr;
use std::thread;
use core::time::Duration;
/// Returns a `serialport::SerialPortSettings` corresponding to the default settings of
/// an RNB2903. Use this to configure your serial port.
///
/// Information obtained from Microchip document 40001811 revision B. Timeout is by
/// default set to a very long time; this is sometimes modified on the `SerialPort` itself
/// during certain operations.
pub fn serial_config() -> SerialPortSettings {
SerialPortSettings {
baud_rate: 57600,
data_bits: DataBits::Eight,
flow_control: FlowControl::None,
parity: Parity::None,
stop_bits: StopBits::One,
timeout: Duration::new(1, 0)
}
}
// Once connected to a serial port, the library needs to verify that it is actually
// connected to a RN2903 and not some other serial device. To this end, the `Rn2903`
// wrapper struct's `::new()` function checks the output of the `sys get ver` command,
// which is well-specified.
/// A handle to a serial link connected to a RN2903 module.
///
/// This library guarantees safety regardless of the state of the RN2903.
pub struct Rn2903 {
port: Box<dyn SerialPort>,
}
impl Rn2903 {
/// Open a new connection to a module at the given path or port name, with the
/// default settings.
pub fn new_at<S: AsRef<OsStr>>(port_name: S) -> Result<Self> {
let sp = serialport::open_with_settings(&port_name, &serial_config())?;
Self::new(sp)
}
/// Open a new connection to a module over the given serial connection.
pub fn new(mut port: Box<dyn SerialPort>) -> Result<Self> {
let mut buf = [0; 35];
port.write_all(b"sys get ver\x0D\x0A")?;
port.flush()?;
thread::sleep(Duration::from_millis(12));
port.read(&mut buf)?;
if &buf[0..6] != b"RN2903" {
Err(Error::WrongDevice((&*String::from_utf8_lossy(&buf)).into()))
} else {
Ok(Self {
port
})
}
}
/// Query the module for its firmware version information.
///
/// Returns a `String` like `RN2903 1.0.3 Aug 8 2017 15:11:09`
pub fn system_version(&mut self) -> Result<String> {
let mut buf = [0; 35];
self.port.write_all(b"sys get ver\x0D\x0A")?;
self.port.flush()?;
thread::sleep(Duration::from_millis(12));
self.port.read(&mut buf)?;
Ok((&*String::from_utf8_lossy(&buf).trim_end()).into())
}
}

6
src/main.rs Normal file
View File

@ -0,0 +1,6 @@
use rn2903::Rn2903;
fn main() {
let mut device = Rn2903::new_at("/dev/ttyUSB0").expect("Could not open device. Error");
println!("Successfully connected. Version: {}", device.system_version().expect("Could not read from device. Error:"));
}