func (c *Connection) open() (err error) {
c.file, err = os.OpenFile(c.Name, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
if err != nil {
return err
}
fd, err := c.getFileDescriptor()
if err != nil {
c.file.Close()
return err
}
var st C.struct_termios
_, err = C.tcgetattr(fd, &st)
if err != nil {
c.file.Close()
return err
}
// set the baud rate of the connection
err = c.setBaudRate(c.Baud)
if err != nil {
c.file.Close()
return err
}
// No timeout set directly on termios
st.c_cc[C.VMIN] = 0
st.c_cc[C.VTIME] = 0
// Select local mode
st.c_cflag |= (C.CLOCAL | C.CREAD)
// Select raw mode
st.c_lflag &= ^C.tcflag_t(C.ICANON | C.ECHO | C.ECHOE | C.ISIG)
st.c_oflag &= ^C.tcflag_t(C.OPOST)
_, err = C.tcsetattr(fd, C.TCSANOW, &st)
if err != nil {
c.file.Close()
return err
}
r1, _, e := syscall.Syscall(syscall.SYS_FCNTL,
uintptr(c.file.Fd()),
uintptr(syscall.F_SETFL),
uintptr(0))
if e != 0 || r1 != 0 {
s := fmt.Sprint("Clearing NONBLOCK syscall error:", e, r1)
c.file.Close()
return errors.New(s)
}
return nil
}
func makeCAttributes(attr *Attributes) C.struct_termios {
var cattr C.struct_termios
cattr.c_iflag = C.tcflag_t(attr.Input)
cattr.c_oflag = C.tcflag_t(attr.Output)
cattr.c_cflag = C.tcflag_t(attr.Control)
cattr.c_lflag = C.tcflag_t(attr.Local)
for i := 0; i < C.NCCS; i++ {
cattr.c_cc[i] = C.cc_t(attr.ControlChars[i])
}
return cattr
}
func cTermios(goTerm *Termios) *C.struct_termios {
var cTerm C.struct_termios
cTerm.c_iflag = C.tcflag_t(goTerm.IFlag)
cTerm.c_oflag = C.tcflag_t(goTerm.OFlag)
cTerm.c_cflag = C.tcflag_t(goTerm.CFlag)
cTerm.c_lflag = C.tcflag_t(goTerm.LFlag)
for idx, ch := range goTerm.CC {
cTerm.c_cc[idx] = C.cc_t(ch)
}
cTerm.c_ispeed = C.speed_t(goTerm.ISpeed)
cTerm.c_ospeed = C.speed_t(goTerm.OSpeed)
return &cTerm
}
func (s *Serial) SetParity(p string) {
if s.Opened {
var tios C.struct_termios
getTermios(s.f, &tios)
switch p {
case "n":
tios.c_cflag &= C.tcflag_t(^uint16(C.PARENB))
case "o":
tios.c_cflag |= C.PARENB | C.PARODD
case "e":
tios.c_cflag |= C.PARENB
tios.c_cflag &= C.tcflag_t(^uint16(C.PARODD))
}
setTermios(s.f, &tios)
}
}
func (s *Serial) SetStops(stops uint8) {
if s.Opened {
var tios C.struct_termios
getTermios(s.f, &tios)
if stops == 1 {
tios.c_cflag &= C.tcflag_t(^uint16(C.CSTOPB))
} else if stops == 2 {
tios.c_cflag |= C.CSTOPB
}
setTermios(s.f, &tios)
}
}
func (s *Serial) SetBits(b uint8) {
if s.Opened {
switch b {
case 8:
b = C.CS8
case 7:
b = C.CS7
case 6:
b = C.CS6
case 5:
b = C.CS5
default:
b = 0
}
if b != 0 {
var tios C.struct_termios
getTermios(s.f, &tios)
tios.c_cflag &= C.tcflag_t(^uint16(C.CSIZE))
tios.c_cflag |= C.tcflag_t(b)
setTermios(s.f, &tios)
}
}
}
func (s *Serial) Open(name string) bool {
if !s.Opened {
var err error
s.f, err = os.OpenFile(name, os.O_RDWR|syscall.O_NOCTTY|syscall.O_NDELAY|syscall.O_NONBLOCK, 0666)
if err == nil {
s.Name = name
s.Opened = true
var tios C.struct_termios
getTermios(s.f, &tios)
tios.c_cflag |= C.CLOCAL | C.CREAD
tios.c_lflag &= C.tcflag_t(^uint16(C.ICANON | C.ECHO | C.ECHOE | C.ECHOK | C.ECHONL | C.ISIG | C.IEXTEN))
tios.c_iflag &= C.tcflag_t(^uint16(C.BRKINT | C.ICRNL | C.INPCK | C.ISTRIP | C.IXON))
tios.c_oflag &= C.tcflag_t(^uint16(C.OPOST))
tios.c_cc[C.VMIN] = 1
tios.c_cc[C.VTIME] = 0
setTermios(s.f, &tios)
}
}
return s.Opened
}
// Read a password from the terminal without echoing it. No space is added
// after the prompt.
//
// Don't mistake this function for portable; it probably doesn't work anywhere
// except OS X.
func ReadPassword(prompt string) string {
// Grab the current terminal settings.
origTermSettings := getTermSettings()
// Set up a function that will restore the terminal settings exactly once.
var restoreOnce sync.Once
restore := func() {
restoreOnce.Do(func() { setTermSettings(origTermSettings) })
}
// Make sure that the settings are restored if we return normally.
defer restore()
// Also make sure the settings are restored if the user hits Ctrl-C while the
// password is being read. The signal handler remains running even after
// we're done because there is no way to re-enable the default signal
// handler.
signalChan := make(chan os.Signal)
defer close(signalChan)
go handleInterrupt(signalChan, restore)
signal.Notify(signalChan, os.Interrupt)
defer signal.Stop(signalChan)
// Disable echoing.
newTermSettings := origTermSettings
newTermSettings.c_lflag = newTermSettings.c_lflag & ^C.tcflag_t(C.ECHO)
setTermSettings(newTermSettings)
// Display the prompt.
fmt.Fprint(os.Stderr, prompt)
// Read from stdin. Add a newline for the user pressing enter.
reader := bufio.NewReader(os.Stdin)
line, err := reader.ReadString('\n')
fmt.Fprintln(os.Stderr, "")
if err != nil {
log.Fatalln("ReadString:", err)
}
return line[0 : len(line)-1]
}
func openPort(name string, baud int, readTimeout time.Duration) (p *Port, err error) {
f, err := os.OpenFile(name, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
if err != nil {
return
}
fd := C.int(f.Fd())
if C.isatty(fd) != 1 {
f.Close()
return nil, errors.New("File is not a tty")
}
var st C.struct_termios
_, err = C.tcgetattr(fd, &st)
if err != nil {
f.Close()
return nil, err
}
var speed C.speed_t
switch baud {
case 115200:
speed = C.B115200
case 57600:
speed = C.B57600
case 38400:
speed = C.B38400
case 19200:
speed = C.B19200
case 9600:
speed = C.B9600
case 4800:
speed = C.B4800
case 2400:
speed = C.B2400
default:
f.Close()
return nil, fmt.Errorf("Unknown baud rate %v", baud)
}
_, err = C.cfsetispeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
_, err = C.cfsetospeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
// Turn off break interrupts, CR->NL, Parity checks, strip, and IXON
st.c_iflag &= ^C.tcflag_t(C.BRKINT | C.ICRNL | C.INPCK | C.ISTRIP | C.IXOFF | C.IXON | C.PARMRK)
// Select local mode, turn off parity, set to 8 bits
st.c_cflag &= ^C.tcflag_t(C.CSIZE | C.PARENB)
st.c_cflag |= (C.CLOCAL | C.CREAD | C.CS8)
// Select raw mode
st.c_lflag &= ^C.tcflag_t(C.ICANON | C.ECHO | C.ECHOE | C.ISIG)
st.c_oflag &= ^C.tcflag_t(C.OPOST)
// set blocking / non-blocking read
/*
* http://man7.org/linux/man-pages/man3/termios.3.html
* - Supports blocking read and read with timeout operations
*/
vmin, vtime := posixTimeoutValues(readTimeout)
st.c_cc[C.VMIN] = C.cc_t(vmin)
st.c_cc[C.VTIME] = C.cc_t(vtime)
_, err = C.tcsetattr(fd, C.TCSANOW, &st)
if err != nil {
f.Close()
return nil, err
}
//fmt.Println("Tweaking", name)
r1, _, e := syscall.Syscall(syscall.SYS_FCNTL,
uintptr(f.Fd()),
uintptr(syscall.F_SETFL),
uintptr(0))
if e != 0 || r1 != 0 {
s := fmt.Sprint("Clearing NONBLOCK syscall error:", e, r1)
f.Close()
return nil, errors.New(s)
}
/*
r1, _, e = syscall.Syscall(syscall.SYS_IOCTL,
uintptr(f.Fd()),
uintptr(0x80045402), // IOSSIOSPEED
uintptr(unsafe.Pointer(&baud)));
if e != 0 || r1 != 0 {
s := fmt.Sprint("Baudrate syscall error:", e, r1)
f.Close()
return nil, os.NewError(s)
}
*/
return &Port{f: f}, nil
}
func openPort(name string, baud int) (rwc io.ReadWriteCloser, err error) {
f, err := os.OpenFile(name, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
if err != nil {
return
}
fd := C.int(f.Fd())
if C.isatty(fd) != 1 {
f.Close()
return nil, errors.New("File is not a tty")
}
var st C.struct_termios
_, err = C.tcgetattr(fd, &st)
if err != nil {
f.Close()
return nil, err
}
var speed C.speed_t
switch baud {
case 115200:
speed = C.B115200
case 57600:
speed = C.B57600
case 38400:
speed = C.B38400
case 19200:
speed = C.B19200
case 9600:
speed = C.B9600
case 4800:
speed = C.B4800
case 2400:
speed = C.B2400
default:
f.Close()
return nil, fmt.Errorf("Unknown baud rate %v", baud)
}
_, err = C.cfsetispeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
_, err = C.cfsetospeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
// Select local mode
st.c_cflag |= (C.CLOCAL | C.CREAD)
// Select raw mode
st.c_lflag &= ^C.tcflag_t(C.ICANON | C.ECHO | C.ECHOE | C.ISIG)
st.c_oflag &= ^C.tcflag_t(C.OPOST)
_, err = C.tcsetattr(fd, C.TCSANOW, &st)
if err != nil {
f.Close()
return nil, err
}
//fmt.Println("Tweaking", name)
r1, _, e := syscall.Syscall(syscall.SYS_FCNTL,
uintptr(f.Fd()),
uintptr(syscall.F_SETFL),
uintptr(0))
if e != 0 || r1 != 0 {
s := fmt.Sprint("Clearing NONBLOCK syscall error:", e, r1)
f.Close()
return nil, errors.New(s)
}
/*
r1, _, e = syscall.Syscall(syscall.SYS_IOCTL,
uintptr(f.Fd()),
uintptr(0x80045402), // IOSSIOSPEED
uintptr(unsafe.Pointer(&baud)));
if e != 0 || r1 != 0 {
s := fmt.Sprint("Baudrate syscall error:", e, r1)
f.Close()
return nil, os.NewError(s)
}
*/
return f, nil
}
func OpenPort(name string, baud int) (rwc io.ReadWriteCloser, err error) {
f, err := os.OpenFile(name, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
if err != nil {
return
}
fd := C.int(f.Fd())
if C.isatty(fd) != 1 {
f.Close()
return nil, fmt.Errorf("[ERROR] not a tty/cu device")
}
var st C.struct_termios
_, err = C.tcgetattr(fd, &st)
if err != nil {
f.Close()
return nil, err
}
var speed C.speed_t
switch baud {
case 115200:
speed = C.B115200
case 57600:
speed = C.B57600
case 38400:
speed = C.B38400
case 19200:
speed = C.B19200
case 9600:
speed = C.B9600
default:
f.Close()
return nil, fmt.Errorf("Unknown baud rate %v", baud)
}
_, err = C.cfsetispeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
_, err = C.cfsetospeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
// Select local mode
st.c_cflag |= (C.CLOCAL | C.CREAD)
// Select raw mode
st.c_lflag &= ^C.tcflag_t(C.ICANON | C.ECHO | C.ECHOE | C.ISIG)
st.c_oflag &= ^C.tcflag_t(C.OPOST)
_, err = C.tcsetattr(fd, C.TCSANOW, &st)
if err != nil {
f.Close()
return nil, err
}
r1, _, e := syscall.Syscall(syscall.SYS_FCNTL,
uintptr(f.Fd()),
uintptr(syscall.F_SETFL),
uintptr(0))
if e != 0 || r1 != 0 {
s := fmt.Sprint("[WARN] clearing NONBLOCK syscall error:", e, r1)
f.Close()
return nil, fmt.Errorf("%s", s)
}
return f, nil
}
func (bp *baseport) SetMode(baudrate, databits, parity, stopbits, handshake int) error {
if baudrate <= 0 {
return &ParameterError{"baudrate", "has to be > 0"}
}
var datamask uint
switch databits {
case 5:
datamask = C.CS5
case 6:
datamask = C.CS6
case 7:
datamask = C.CS7
case 8:
datamask = C.CS8
default:
return &ParameterError{"databits", "has to be 5, 6, 7 or 8"}
}
if stopbits != 1 && stopbits != 2 {
return &ParameterError{"stopbits", "has to be 1 or 2"}
}
var stopmask uint
if stopbits == 2 {
stopmask = C.CSTOPB
}
var parmask uint
switch parity {
case N:
parmask = 0
case E:
parmask = C.PARENB
case O:
parmask = C.PARENB | C.PARODD
default:
return &ParameterError{"parity", "has to be N, E or O"}
}
var flowmask uint
switch handshake {
case NO_HANDSHAKE:
flowmask = 0
case RTSCTS_HANDSHAKE:
flowmask = C.CRTSCTS
default:
return &ParameterError{"handshake", "has to be NO_HANDSHAKE or RTSCTS_HANDSHAKE"}
}
tio, err := bp.getattr()
if err != nil {
return &Error{"getattr", err}
}
tio.c_cflag &^= C.CSIZE
tio.c_cflag |= C.tcflag_t(datamask)
tio.c_cflag &^= C.PARENB | C.PARODD
tio.c_cflag |= C.tcflag_t(parmask)
tio.c_cflag &^= C.CSTOPB
tio.c_cflag |= C.tcflag_t(stopmask)
tio.c_cflag &^= C.CRTSCTS
tio.c_cflag |= C.tcflag_t(flowmask)
if err := bp.setattr(tio); err != nil {
return &Error{"setattr", err}
}
if err := bp.SetBaudRate(baudrate); err != nil {
return err
}
return nil
}
VSUSP = uint(C.VSUSP) /* SUSP character */ VMIN = uint(C.VMIN) /* MIN value */ VTIME = uint(C.VTIME) /* TIME value */ NCCS = uint(C.NCCS) /* Size of the array c_cc for control characters */ //VEOL2 = uint (C.VEOL2) not-posix //VWERASE = uint (C.VWERASE) not-posix //VREPRINT = uint (C.VREPRINT); not-posix //VDSUSP = uint (C.VDSUSP); not-posix //VLNEXT = uint (C.VLNEXT); not-posix //VDISCARD = uint (C.VDISCARD); not-posix //VSTATUS = uint (C.VSTATUS); not-posix ) // Input modes - software input processing const ( BRKINT = C.tcflag_t(C.BRKINT) /* map BREAK to SIGINTR */ ICRNL = C.tcflag_t(C.ICRNL) /* map CR to NL (ala CRMOD) */ IGNBRK = C.tcflag_t(C.IGNBRK) /* ignore BREAK condition */ IGNCR = C.tcflag_t(C.IGNCR) /* ignore CR */ IGNPAR = C.tcflag_t(C.IGNPAR) /* ignore (discard) parity errors */ INLCR = C.tcflag_t(C.INLCR) /* map NL into CR */ INPCK = C.tcflag_t(C.INPCK) /* enable checking of parity errors */ ISTRIP = C.tcflag_t(C.ISTRIP) /* strip 8th bit off chars */ IXANY = C.tcflag_t(C.IXANY) /* any char will restart after stop */ IXOFF = C.tcflag_t(C.IXOFF) /* enable input flow control */ IXON = C.tcflag_t(C.IXON) /* enable output flow control */ PARMRK = C.tcflag_t(C.PARMRK) /* mark parity and framing errors */ //IMAXBEL = C.tcflag_t(C.IMAXBEL) /* ring bell on input queue full */ //IUTF8 = C.tcflag_t(C.IUTF8) /* maintain state for UTF-8 VERASE */ )
func openPort(name string, baud int) (rwc io.ReadWriteCloser, err error) {
f, err := os.OpenFile(name, syscall.O_RDWR|syscall.O_NOCTTY, 0666)
if err != nil {
return
}
fd := C.int(f.Fd())
if C.isatty(fd) != 1 {
f.Close()
return nil, errors.New("File is not a tty")
}
var st C.struct_termios
_, err = C.tcgetattr(fd, &st)
if err != nil {
f.Close()
return nil, err
}
var speed C.speed_t
switch baud {
case 115200:
speed = C.B115200
case 57600:
speed = C.B57600
case 38400:
speed = C.B38400
case 19200:
speed = C.B19200
case 9600:
speed = C.B9600
case 4800:
speed = C.B4800
case 2400:
speed = C.B2400
default:
f.Close()
return nil, fmt.Errorf("Unknown baud rate %v", baud)
}
_, err = C.cfsetispeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
_, err = C.cfsetospeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
// Select local mode
st.c_cflag |= (C.CLOCAL | C.CREAD)
// Select raw mode
st.c_lflag &= ^C.tcflag_t(C.ICANON | C.ECHO | C.ECHOE | C.ISIG)
st.c_oflag &= ^C.tcflag_t(C.OPOST)
_, err = C.tcsetattr(fd, C.TCSANOW, &st)
if err != nil {
f.Close()
return nil, err
}
return f, nil
}
func openPort(name string, baud int, spec []byte, flow []bool) (rwc io.ReadWriteCloser, err error) {
port := new(serialPort)
f, err := os.OpenFile(name, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
if err != nil {
return
}
fd := C.int(f.Fd())
if C.isatty(fd) != 1 {
f.Close()
return nil, errors.New("File is not a tty")
}
var st C.struct_termios
_, err = C.tcgetattr(fd, &st)
if err != nil {
f.Close()
return nil, err
}
var speed C.speed_t
switch baud {
case 115200:
speed = C.B115200
case 57600:
speed = C.B57600
case 38400:
speed = C.B38400
case 19200:
speed = C.B19200
case 9600:
speed = C.B9600
default:
f.Close()
return nil, fmt.Errorf("Unknown baud rate %v", baud)
}
_, err = C.cfsetispeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
_, err = C.cfsetospeed(&st, speed)
if err != nil {
f.Close()
return nil, err
}
// Select local mode
st.c_cflag |= (C.CLOCAL | C.CREAD)
// Select raw mode
st.c_lflag &= ^C.tcflag_t(C.ICANON | C.ECHO | C.ECHOE | C.ISIG)
st.c_oflag &= ^C.tcflag_t(C.OPOST)
// Flow control
if flow[RTS_FLAG] {
st.c_cflag |= C.tcflag_t(C.CRTSCTS)
}
if flow[XON_FLAG] {
st.c_cflag |= C.tcflag_t(C.IXON | C.IXOFF | C.IXANY)
}
// Defaults to 8N1 if nothing valid is given
byteSize := spec[0]
parity := spec[1]
stopBits := spec[2]
switch byteSize {
case byte(5):
st.c_cflag |= C.tcflag_t(C.CS5)
break
case byte(6):
st.c_cflag |= C.tcflag_t(C.CS6)
break
case byte(7):
st.c_cflag |= C.tcflag_t(C.CS7)
break
case byte(8):
default:
st.c_cflag |= C.tcflag_t(C.CS8)
break
}
switch parity {
case PARITY_EVEN:
st.c_cflag |= C.tcflag_t(C.PARENB)
st.c_cflag &= ^C.tcflag_t(C.PARODD)
break
case PARITY_ODD:
st.c_cflag |= C.tcflag_t(C.PARENB)
st.c_cflag |= C.tcflag_t(C.PARODD)
break
case PARITY_NONE:
default:
st.c_cflag &= ^C.tcflag_t(C.PARENB)
break
}
switch stopBits {
case byte(2):
st.c_cflag |= C.tcflag_t(C.CSTOPB)
break
case byte(1):
default:
st.c_cflag &= ^C.tcflag_t(C.CSTOPB)
break
}
st.c_cflag &= ^C.tcflag_t(C.CSIZE)
_, err = C.tcsetattr(fd, C.TCSANOW, &st)
if err != nil {
f.Close()
return nil, err
}
//fmt.Println("Tweaking", name)
r1, _, e := syscall.Syscall(syscall.SYS_FCNTL,
uintptr(f.Fd()),
uintptr(syscall.F_SETFL),
uintptr(0))
if e != 0 || r1 != 0 {
s := fmt.Sprint("Clearing NONBLOCK syscall error:", e, r1)
f.Close()
return nil, errors.New(s)
}
/*
r1, _, e = syscall.Syscall(syscall.SYS_IOCTL,
uintptr(f.Fd()),
uintptr(0x80045402), // IOSSIOSPEED
uintptr(unsafe.Pointer(&baud)));
if e != 0 || r1 != 0 {
s := fmt.Sprint("Baudrate syscall error:", e, r1)
f.Close()
return nil, os.NewError(s)
}
*/
port.f = f
return port, nil
}
