termioslib

termioslib is a simple cgo based wrapper around termios.h

Overview

termioslib is a simple no-nonsense wrapper for UNIX termios.h. It exposes all the defines and functions in termios.h including some extensions not defined by POSIX. You might need to remove or rename the additional defines/functions for your specific system. This was developed on Mac OS X. I welcome feedback on whether or not modifications need to be made to run on other Unix/Linux.

Installation

1. Make sure you have the a working Go environment. See the install instructions. termios targets the 'release' tag. To get the release tag, simply run hg update -r release.
2. Make sure that $GOROOT is set. termios installs itself as a Go package, so it requires $GOROOT. See Go's install instructions for more information about $GOROOT.
3. git clone git://github.com/wdreeveii/termioslib.git
4. cd termioslib && make install

Example

package main

import (
    "os"
    "errors"
    "fmt"
    "termioslib"
)


func main () {
    var (
		err error
		orig_termios termioslib.Termios
		work_termios termioslib.Termios
		ser *os.File
    )

    defer func () {
        if err != nil { fmt.Println (err) }
    } ()
    
    // open the serial port, other options of interest may be os.NDELAY and os.NOCTTY
    ser, err = os.Open("/dev/cu.usbserial-FTCW1RJN", os.O_RDWR , 777)
    if err != nil { return }
	
    defer func () {
	ser.Close()
    }()
	
    // flush all buffers
    if err = termioslib.Flush(ser.Fd(), termioslib.TCIOFLUSH); err != nil { return }
	
    // save a copy of the original terminal configuration
    if err = termioslib.Getattr(ser.Fd(), &orig_termios); err != nil { return }
    
    // get a working copy
    if err = termioslib.Getattr(ser.Fd(), &work_termios); err != nil { return }
    
    work_termios.C_iflag &= ^(termioslib.IGNBRK | termioslib.BRKINT | termioslib.IGNPAR | termioslib.PARMRK | termioslib.INPCK | termioslib.ISTRIP | termioslib.INLCR | termioslib.IGNCR | termioslib.ICRNL | termioslib.IXON | termioslib.IXOFF | termioslib.IXANY | termioslib.IMAXBEL | termioslib.IUTF8)
    work_termios.C_oflag &= ^(termioslib.OPOST | termioslib.ONLCR )
    work_termios.C_lflag &= ^(termioslib.ISIG | termioslib.ICANON | termioslib.IEXTEN | termioslib.ECHO | termioslib.ECHOE | termioslib.ECHOK | termioslib.ECHONL | termioslib.NOFLSH | termioslib.TOSTOP | termioslib.ECHOPRT | termioslib.ECHOCTL | termioslib.ECHOKE)
    work_termios.C_cflag &= ^(termioslib.CSIZE | termioslib.PARENB | termioslib.PARODD | termioslib.HUPCL | termioslib.CSTOPB | termioslib.CRTSCTS)
    work_termios.C_cflag |= (termioslib.CS8 | termioslib.CREAD | termioslib.CLOCAL)
    work_termios.C_cc[termioslib.VMIN] = 1
    work_termios.C_cc[termioslib.VTIME] = 0
    
    termioslib.Setspeed(&work_termios, termioslib.B57600)
    // set the working copy
    if err = termioslib.Setattr(ser.Fd(), termioslib.TCSANOW , &work_termios); err != nil { return }
    
    // set the settings back to the original when the program exits
    defer func () {
	err = termioslib.Setattr(ser.Fd(), termioslib.TCSANOW, &orig_termios)
    } ()
    
    // basic file read block
    buffer := make([]byte, 80) 
    n, err := ser.Read(buffer)

    for err == nil {
	    fmt.Printf("%s", string(buffer[0:n]))
	    n, err = ser.Read(buffer)
    }
}

Future

At one time or another, this code has worked on both Linux and Mac OS X. It was updated in April 2013 to go 1.0

About

termioslib was written by Whitham D. Reeve II