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use std::error::Error as StdError; use std::ffi::OsStr; use std::fmt; use std::io; use std::path::Path; use std::time::Duration; /// A module that exports traits that are useful to have in scope. /// /// It is intended to be glob imported: /// /// ``` /// use serialport::prelude::*; /// ``` pub mod prelude { pub use ::{BaudRate, DataBits, FlowControl, Parity, StopBits}; pub use ::{SerialPort, SerialPortInfo}; } #[cfg(unix)] /// The implementation of serialport for POSIX-based systems (Linux, BSD, Mac) pub mod posix; #[cfg(windows)] /// The implementation of serialport for Windows systems pub mod windows; /// A type for results generated by interacting with serial ports. /// /// The `Err` type is hard-wired to [`serialport::Error`](struct.Error.html). pub type Result<T> = std::result::Result<T, ::Error>; /// Categories of errors that can occur when interacting with serial ports. /// /// This list is intended to grow over time and it is not recommended to /// exhaustively match against it. #[derive(Debug,Clone,Copy,PartialEq,Eq)] pub enum ErrorKind { /// The device is not available. /// /// This could indicate that the device is in use by another process or was /// disconnected while performing I/O. NoDevice, /// A parameter was incorrect. InvalidInput, /// An unknown error occurred. Unknown, /// An I/O error occurred. /// /// The type of I/O error is determined by the inner `io::ErrorKind`. Io(io::ErrorKind), } /// An error type for serial port operations. #[derive(Debug)] pub struct Error { pub kind: ErrorKind, pub description: String, } impl Error { pub fn new<T: Into<String>>(kind: ErrorKind, description: T) -> Self { Error { kind: kind, description: description.into(), } } /// Returns the corresponding `ErrorKind` for this error. pub fn kind(&self) -> ErrorKind { self.kind } } impl fmt::Display for Error { fn fmt(&self, fmt: &mut fmt::Formatter) -> std::result::Result<(), fmt::Error> { fmt.write_str(&self.description) } } impl StdError for Error { fn description(&self) -> &str { &self.description } } impl From<io::Error> for Error { fn from(io_error: io::Error) -> Error { Error::new(ErrorKind::Io(io_error.kind()), format!("{}", io_error)) } } impl From<Error> for io::Error { fn from(error: Error) -> io::Error { let kind = match error.kind { ErrorKind::NoDevice => io::ErrorKind::NotFound, ErrorKind::InvalidInput => io::ErrorKind::InvalidInput, ErrorKind::Unknown => io::ErrorKind::Other, ErrorKind::Io(kind) => kind, }; io::Error::new(kind, error.description) } } /// Serial port baud rates. /// /// ## Portability /// /// The `BaudRate` variants with numeric suffixes, e.g., `Baud9600`, indicate standard baud rates /// that are widely-supported on many systems. While non-standard baud rates can be set with /// `BaudOther`, their behavior is system-dependent. Some systems may not support arbitrary baud /// rates. Using the standard baud rates is more likely to result in portable applications. #[derive(Debug,Copy,Clone,PartialEq,Eq)] pub enum BaudRate { /** 110 baud. */ Baud110, /** 300 baud. */ Baud300, /** 600 baud. */ Baud600, /** 1200 baud. */ Baud1200, /** 2400 baud. */ Baud2400, /** 4800 baud. */ Baud4800, /** 9600 baud. */ Baud9600, /** 19,200 baud. */ Baud19200, /** 38,400 baud. */ Baud38400, /** 57,600 baud. */ Baud57600, /** 115,200 baud. */ Baud115200, /// Non-standard baud rates. /// /// `BaudOther` can be used to set non-standard baud rates by setting its member to be the /// desired baud rate. /// /// ``` /// # use serialport::BaudRate::BaudOther; /// BaudOther(4_000_000); // 4,000,000 baud /// ``` /// /// Non-standard baud rates may not be supported on all systems. BaudOther(usize), } impl BaudRate { /// Creates a `BaudRate` for a particular speed. /// /// This function can be used to select a `BaudRate` variant from an integer containing the /// desired baud rate. /// /// ## Example /// /// ``` /// # use serialport::BaudRate; /// assert_eq!(BaudRate::Baud9600, BaudRate::from_speed(9600)); /// assert_eq!(BaudRate::Baud115200, BaudRate::from_speed(115200)); /// assert_eq!(BaudRate::BaudOther(4000000), BaudRate::from_speed(4000000)); /// ``` pub fn from_speed(speed: usize) -> BaudRate { match speed { 110 => BaudRate::Baud110, 300 => BaudRate::Baud300, 600 => BaudRate::Baud600, 1200 => BaudRate::Baud1200, 2400 => BaudRate::Baud2400, 4800 => BaudRate::Baud4800, 9600 => BaudRate::Baud9600, 19200 => BaudRate::Baud19200, 38400 => BaudRate::Baud38400, 57600 => BaudRate::Baud57600, 115200 => BaudRate::Baud115200, n => BaudRate::BaudOther(n), } } /// Returns the baud rate as an integer. /// /// ## Example /// /// ``` /// # use serialport::BaudRate; /// assert_eq!(9600, BaudRate::Baud9600.speed()); /// assert_eq!(115200, BaudRate::Baud115200.speed()); /// assert_eq!(4000000, BaudRate::BaudOther(4000000).speed()); /// ``` pub fn speed(&self) -> usize { match *self { BaudRate::Baud110 => 110, BaudRate::Baud300 => 300, BaudRate::Baud600 => 600, BaudRate::Baud1200 => 1200, BaudRate::Baud2400 => 2400, BaudRate::Baud4800 => 4800, BaudRate::Baud9600 => 9600, BaudRate::Baud19200 => 19200, BaudRate::Baud38400 => 38400, BaudRate::Baud57600 => 57600, BaudRate::Baud115200 => 115200, BaudRate::BaudOther(n) => n, } } } /// Number of bits per character. #[derive(Debug,Copy,Clone,PartialEq,Eq)] pub enum DataBits { // 5 bits per character Five, // 6 bits per character Six, // 7 bits per character Seven, // 8 bits per character Eight, } /// Parity checking modes. /// /// When parity checking is enabled (`Odd` or `Even`) an extra bit is transmitted with /// each character. The value of the parity bit is arranged so that the number of 1 bits in the /// character (including the parity bit) is an even number (`Even`) or an odd number /// (`Odd`). /// /// Parity checking is disabled by setting `None`, in which case parity bits are not /// transmitted. #[derive(Debug,Copy,Clone,PartialEq,Eq)] pub enum Parity { /// No parity bit. None, /// Parity bit sets odd number of 1 bits. Odd, /// Parity bit sets even number of 1 bits. Even, } /// Number of stop bits. /// /// Stop bits are transmitted after every character. #[derive(Debug,Copy,Clone,PartialEq,Eq)] pub enum StopBits { /// One stop bit. One, /// Two stop bits. Two, } /// Flow control modes. #[derive(Debug,Copy,Clone,PartialEq,Eq)] pub enum FlowControl { /// No flow control. None, /// Flow control using XON/XOFF bytes. Software, /// Flow control using RTS/CTS signals. Hardware, } /// A struct containing all serial port settings #[derive(Debug,Copy,Clone,PartialEq,Eq)] pub struct SerialPortSettings { baud_rate: BaudRate, data_bits: DataBits, flow_control: FlowControl, parity: Parity, stop_bits: StopBits, timeout: Duration } /// A trait for serial port devices /// /// This trait is all that's necessary to implement a new serial port driver /// for a new platform. pub trait SerialPort: io::Read + io::Write { // Port settings getters /// Returns a struct with the current port settings fn settings(&self) -> SerialPortSettings; /// Returns the current baud rate. /// /// This function returns `None` if the baud rate could not be determined. This may occur if /// the hardware is in an uninitialized state. Setting a baud rate with `set_baud_rate()` /// should initialize the baud rate to a supported value. fn baud_rate(&self) -> Option<BaudRate>; /// Returns the character size. /// /// This function returns `None` if the character size could not be determined. This may occur /// if the hardware is in an uninitialized state or is using a non-standard character size. /// Setting a baud rate with `set_char_size()` should initialize the character size to a /// supported value. fn data_bits(&self) -> Option<DataBits>; /// Returns the flow control mode. /// /// This function returns `None` if the flow control mode could not be determined. This may /// occur if the hardware is in an uninitialized state or is using an unsupported flow control /// mode. Setting a flow control mode with `set_flow_control()` should initialize the flow /// control mode to a supported value. fn flow_control(&self) -> Option<FlowControl>; /// Returns the parity-checking mode. /// /// This function returns `None` if the parity mode could not be determined. This may occur if /// the hardware is in an uninitialized state or is using a non-standard parity mode. Setting /// a parity mode with `set_parity()` should initialize the parity mode to a supported value. fn parity(&self) -> Option<Parity>; /// Returns the number of stop bits. /// /// This function returns `None` if the number of stop bits could not be determined. This may /// occur if the hardware is in an uninitialized state or is using an unsupported stop bit /// configuration. Setting the number of stop bits with `set_stop-bits()` should initialize the /// stop bits to a supported value. fn stop_bits(&self) -> Option<StopBits>; /// Returns the current timeout. fn timeout(&self) -> Duration; // Port settings setters /// Applies all settings for a struct. This isn't guaranteed to involve only /// a single call into the driver, though that may be done on some /// platforms. fn set_all(&mut self, SerialPortSettings) -> ::Result<()>; /// Sets the baud rate. /// /// ## Errors /// /// If the implementation does not support the requested baud rate, this function may return an /// `InvalidInput` error. Even if the baud rate is accepted by `set_baud_rate()`, it may not be /// supported by the underlying hardware. fn set_baud_rate(&mut self, baud_rate: BaudRate) -> ::Result<()>; /// Sets the character size. fn set_data_bits(&mut self, data_bits: DataBits) -> ::Result<()>; /// Sets the flow control mode. fn set_flow_control(&mut self, flow_control: FlowControl) -> ::Result<()>; /// Sets the parity-checking mode. fn set_parity(&mut self, parity: Parity) -> ::Result<()>; /// Sets the number of stop bits. fn set_stop_bits(&mut self, stop_bits: StopBits) -> ::Result<()>; /// Sets the timeout for future I/O operations. fn set_timeout(&mut self, timeout: Duration) -> ::Result<()>; // Functions for setting non-data control signal pins /// Sets the state of the RTS (Request To Send) control signal. /// /// Setting a value of `true` asserts the RTS control signal. `false` clears the signal. /// /// ## Errors /// /// This function returns an error if the RTS control signal could not be set to the desired /// state on the underlying hardware: /// /// * `NoDevice` if the device was disconnected. /// * `Io` for any other type of I/O error. fn write_request_to_send(&mut self, level: bool) -> ::Result<()>; /// Writes to the Data Terminal Ready pin /// /// Setting a value of `true` asserts the DTR control signal. `false` clears the signal. /// /// ## Errors /// /// This function returns an error if the DTR control signal could not be set to the desired /// state on the underlying hardware: /// /// * `NoDevice` if the device was disconnected. /// * `Io` for any other type of I/O error. fn write_data_terminal_ready(&mut self, level: bool) -> ::Result<()>; // Functions for reading additional pins /// Reads the state of the CTS (Clear To Send) control signal. /// /// This function returns a boolean that indicates whether the CTS control signal is asserted. /// /// ## Errors /// /// This function returns an error if the state of the CTS control signal could not be read /// from the underlying hardware: /// /// * `NoDevice` if the device was disconnected. /// * `Io` for any other type of I/O error. fn read_clear_to_send(&mut self) -> ::Result<bool>; /// Reads the state of the Data Set Ready control signal. /// /// This function returns a boolean that indicates whether the DSR control signal is asserted. /// /// ## Errors /// /// This function returns an error if the state of the DSR control signal could not be read /// from the underlying hardware: /// /// * `NoDevice` if the device was disconnected. /// * `Io` for any other type of I/O error. fn read_data_set_ready(&mut self) -> ::Result<bool>; /// Reads the state of the Ring Indicator control signal. /// /// This function returns a boolean that indicates whether the RI control signal is asserted. /// /// ## Errors /// /// This function returns an error if the state of the RI control signal could not be read from /// the underlying hardware: /// /// * `NoDevice` if the device was disconnected. /// * `Io` for any other type of I/O error. fn read_ring_indicator(&mut self) -> ::Result<bool>; /// Reads the state of the Carrier Detect control signal. /// /// This function returns a boolean that indicates whether the CD control signal is asserted. /// /// ## Errors /// /// This function returns an error if the state of the CD control signal could not be read from /// the underlying hardware: /// /// * `NoDevice` if the device was disconnected. /// * `Io` for any other type of I/O error. fn read_carrier_detect(&mut self) -> ::Result<bool>; } /// A device-independent implementation of serial port information. #[derive(Debug,Clone,PartialEq,Eq)] pub struct SerialPortInfo { /// The short name of the serial port pub port_name: String, } /// Opens the serial port indicated by the given device path /// /// This is the canonical way to open a new serial port. /// /// ``` /// serialport::open("/dev/ttyUSB0"); /// ``` pub fn open<T: AsRef<OsStr> + ?Sized>(port: &T) -> ::Result<Box<SerialPort>> { // This is written with explicit returns because of: // https://github.com/rust-lang/rust/issues/38337 #[cfg(unix)] return posix::TTYPort::open(Path::new(port)); #[cfg(windows)] return windows::COMPort::open(Path::new(port)); #[cfg(not(any(unix, windows)))] Err(Error::new(ErrorKind::Unknown, "open() not implemented for platform")) } /// Returns a list of all serial ports on system /// /// It is not guaranteed that these ports exist or are available even if they're /// returned by this function. pub fn available_ports() -> ::Result<Vec<SerialPortInfo>> { #[cfg(unix)] return posix::available_ports(); #[cfg(windows)] return windows::available_ports(); #[cfg(not(any(unix, windows)))] Err(Error::new(ErrorKind::Unknown, "available_ports() not implemented for platform")) } /// Returns a list of available baud rates for this system. /// /// Officially supported baud rates vary by system. This functions returns a /// of strings indicating their values. This is most useful for UI applications /// that want to expose them to a user through text. pub fn available_baud_rates() -> Vec<u32> { #[cfg(unix)] return posix::available_baud_rates(); #[cfg(windows)] return windows::available_baud_rates(); #[cfg(not(any(unix, windows)))] return Vec::new(); }