serial

README

Forked version of github.com/tarm/goserial

This version supports opening a port with RtsOn or DtrOn.

Modifications to this fork

Added the ability to turn on RTS and DTR. This is done by passing in a config struct that is setup to support future flags as needed. In particular the RTS being configured as on was key in supporting the TinyG for the serial-port-json-server.

(Original Readme Below)

GoSerial

A simple go package to allow you to read and write from the serial port as a stream of bytes.

Details

It aims to have the same API on all platforms, including windows. As an added bonus, the windows package does not use cgo, so you can cross compile for windows from another platform. Unfortunately goinstall does not currently let you cross compile so you will have to do it manually:

GOOS=windows make clean install

Currently there is very little in the way of configurability. You can set the baud rate. Then you can Read(), Write(), or Close() the connection. Read() will block until at least one byte is returned. Write is the same. There is currently no exposed way to set the timeouts, though patches are welcome.

Currently all ports are opened with 8 data bits, 1 stop bit, no parity, no hardware flow control, and no software flow control. This works fine for many real devices and many faux serial devices including usb-to-serial converters and bluetooth serial ports.

You may Read() and Write() simulantiously on the same connection (from different goroutines).

Usage

package main

import (
        "github.com/tarm/goserial"
        "log"
)

func main() {
        c := &serial.Config{Name: "COM45", Baud: 115200}
        s, err := serial.OpenPort(c)
        if err != nil {
                log.Fatal(err)
        }
        
        n, err := s.Write([]byte("test"))
        if err != nil {
                log.Fatal(err)
        }
        
        buf := make([]byte, 128)
        n, err = s.Read(buf)
        if err != nil {
                log.Fatal(err)
        }
        log.Print("%q", buf[:n])
}

Possible Future Work

• better tests (loopback etc)

Documentation

Overview

Goserial is a simple go package to allow you to read and write from the serial port as a stream of bytes.

It aims to have the same API on all platforms, including windows. As an added bonus, the windows package does not use cgo, so you can cross compile for windows from another platform. Unfortunately goinstall does not currently let you cross compile so you will have to do it manually:

GOOS=windows make clean install

Currently there is very little in the way of configurability. You can set the baud rate. Then you can Read(), Write(), or Close() the connection. Read() will block until at least one byte is returned. Write is the same. There is currently no exposed way to set the timeouts, though patches are welcome.

Currently all ports are opened with 8 data bits, 1 stop bit, no parity, no hardware flow control, and no software flow control. This works fine for many real devices and many faux serial devices including usb-to-serial converters and bluetooth serial ports.

You may Read() and Write() simulantiously on the same connection (from different goroutines).

Example usage:

package main

import (
      "github.com/tarm/goserial"
      "log"
)

func main() {
      c := &serial.Config{Name: "COM5", Baud: 115200}
      s, err := serial.OpenPort(c)
      if err != nil {
              log.Fatal(err)
      }

      n, err := s.Write([]byte("test"))
      if err != nil {
              log.Fatal(err)
      }

      buf := make([]byte, 128)
      n, err = s.Read(buf)
      if err != nil {
              log.Fatal(err)
      }
      log.Print("%q", buf[:n])
}

Index

• func OpenPort(c *Config) (io.ReadWriteCloser, error)
• type Config

Functions

func OpenPort

func OpenPort(c *Config) (io.ReadWriteCloser, error)

OpenPort opens a serial port with the specified configuration

Types

type Config

type Config struct {
	Name string
	Baud int

	// CRLFTranslate bool
	// TimeoutStuff int
	RtsOn bool
	DtrOn bool
}

Config contains the information needed to open a serial port.

Currently few options are implemented, but more may be added in the future (patches welcome), so it is recommended that you create a new config addressing the fields by name rather than by order.

For example:

c0 := &serial.Config{Name: "COM45", Baud: 115200}

or

c1 := new(serial.Config)
c1.Name = "/dev/tty.usbserial"
c1.Baud = 115200