func (c *Connection) setBaudRate(baud Baud) error {
fd, err := c.getFileDescriptor()
if err != nil {
return err
}
var st C.struct_termios
_, err = C.tcgetattr(fd, &st)
if err != nil {
return err
}
speed, err := convertBaud(c.Baud)
if err != nil {
return err
}
_, err = C.cfsetispeed(&st, speed)
if err != nil {
return err
}
_, err = C.cfsetospeed(&st, speed)
if err != nil {
return err
}
return nil
}
/**
* Open the serial port setting the baud etc.
*/
func openSerial() (io.ReadWriteCloser, error) {
file, err :=
os.OpenFile(
"/dev/ttyUSB0",
syscall.O_RDWR|syscall.O_NOCTTY,
0600)
if err != nil {
return nil, err
}
fd := C.int(file.Fd())
if C.isatty(fd) == 0 {
err := errors.New("File is not a serial port")
return nil, err
}
var termios C.struct_termios
_, err = C.tcgetattr(fd, &termios)
if err != nil {
return nil, err
}
var baud C.speed_t
baud = C.B115200
_, err = C.cfsetispeed(&termios, baud)
if err != nil {
return nil, err
}
_, err = C.cfsetospeed(&termios, baud)
if err != nil {
return nil, err
}
return file, nil
}
// SetOSpeed sets the output (transmitter) baudrate in termios
// structure t to speed. Argument speed must be a numerical (integer)
// baudrate value in bits-per-second. Returns syscall.EINVAL if the
// requested baudrate is not supported. See also cfsetospeed(3).
func (t *Termios) SetOSpeed(speed int) error {
code, ok := stdSpeeds.Code(speed)
if !ok {
return syscall.EINVAL
}
C.cfsetospeed(&t.t, C.speed_t(code))
return nil
}
// Setospeed sets the input baud rate in the Termios
// structure referenced by dst to speed.
func Setospeed(dst *Termios, speed C.speed_t) error {
dst.i.c_iflag = dst.C_iflag
dst.i.c_oflag = dst.C_oflag
dst.i.c_cflag = dst.C_cflag
dst.i.c_lflag = dst.C_lflag
dst.i.c_cc = dst.C_cc
_, rv := C.cfsetospeed(&dst.i, speed)
if rv == nil {
dst.C_iflag = dst.i.c_iflag
dst.C_oflag = dst.i.c_oflag
dst.C_cflag = dst.i.c_cflag
dst.C_lflag = dst.i.c_lflag
dst.C_cc = dst.i.c_cc
}
return rv
}
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 SerialChannels(name string, baud int, debug bool) (chan byte, chan byte, chan bool, chan bool, error) {
var err error
var serFile *os.File
var chFromSerial, chToSerial chan byte
var chDTRSerial, chQuitSerial chan bool
serFile, err = os.OpenFile(name, os.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
if err == nil {
fd := C.int(serFile.Fd())
var st C.struct_termios
_, err = C.tcgetattr(fd, &st)
if err == nil {
if C.isatty(fd) != 1 {
err = errors.New("Not a tty")
}
}
var speed C.speed_t
if err == nil {
switch baud {
case 230400:
speed = C.B230400
case 115200:
speed = C.B115200
case 57600:
speed = C.B57600
case 19200:
speed = C.B19200
case 9600:
speed = C.B9600
default:
err = errors.New("Invalid baud rate")
}
}
if err == nil {
_, err = C.cfsetispeed(&st, speed)
if err == nil {
_, err = C.cfsetospeed(&st, speed)
}
}
if err == nil {
C.cfmakeraw(&st)
_, err = C.tcsetattr(fd, C.TCSANOW, &st)
}
if err == nil {
chFromSerial = make(chan byte, 8192)
chQuitFrom := make(chan bool)
go func() {
datain := make([]byte, 1)
for q := false; q == false; {
count, _ := serFile.Read(datain)
for i := 0; i < count; i++ {
if debug {
if datain[i] == byte(0x0D) {
fmt.Print("(\n)")
} else {
fmt.Printf("(%02X)", datain[i])
}
}
chFromSerial <- datain[i]
}
select {
case q = <-chQuitFrom:
default:
}
time.Sleep(10)
}
}()
chToSerial = make(chan byte, 8192)
chQuitTo := make(chan bool)
go func() {
dataout := make([]byte, 1)
for q := false; q == false; {
dataout[0] = <-chToSerial
if debug {
if dataout[0] == byte(0x0D) {
fmt.Print("[\n]")
} else {
fmt.Printf("[%c]", dataout[0])
}
}
scount, serr := serFile.Write(dataout)
if scount != 1 || serr != nil {
fmt.Printf("SERIAL ERROR: write error [%d][%s]\n", scount, serr)
}
}
}()
chDTRSerial = make(chan bool)
chQuitDTR := make(chan bool)
go func() {
var param uint
var ep syscall.Errno
for q := false; q == false; {
select {
case q = <-chQuitDTR:
case dtr := <-chDTRSerial:
param = syscall.TIOCM_DTR
if dtr {
_, _, ep = syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.TIOCMBIS, uintptr(unsafe.Pointer(¶m)))
} else {
_, _, ep = syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.TIOCMBIC, uintptr(unsafe.Pointer(¶m)))
}
if ep != 0 {
fmt.Printf("SERIAL ERROR: DTR error [%d]\n", ep)
}
}
}
}()
go func() {
<-chQuitSerial
serFile.Close()
chQuitFrom <- true
chQuitTo <- true
chQuitDTR <- true
}()
}
}
return chFromSerial, chToSerial, chDTRSerial, chQuitSerial, err
}
func openPort(name string, c *Config) (rwc io.ReadWriteCloser, err error) {
f, err := os.OpenFile(name, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
if err != nil {
return
}
defer func() {
if err != nil {
f.Close()
}
}()
fd := C.int(f.Fd())
if C.isatty(fd) != 1 {
return nil, errors.New("File is not a tty")
}
var st C.struct_termios
_, err = C.tcgetattr(fd, &st)
if err != nil {
return nil, err
}
var speed C.speed_t
switch c.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:
return nil, fmt.Errorf("Unknown baud rate %v", c.Baud)
}
_, err = C.cfsetispeed(&st, speed)
if err != nil {
return nil, err
}
_, err = C.cfsetospeed(&st, speed)
if err != nil {
return nil, err
}
// Select local mode
st.c_cflag |= C.CLOCAL | C.CREAD
// Select stop bits
switch c.StopBits {
case StopBits1:
st.c_cflag &^= C.CSTOPB
case StopBits2:
st.c_cflag |= C.CSTOPB
default:
panic(c.StopBits)
}
// Select character size
st.c_cflag &^= C.CSIZE
switch c.Size {
case Byte5:
st.c_cflag |= C.CS5
case Byte6:
st.c_cflag |= C.CS6
case Byte7:
st.c_cflag |= C.CS7
case Byte8:
st.c_cflag |= C.CS8
default:
panic(c.Size)
}
// Select parity mode
switch c.Parity {
case ParityNone:
st.c_cflag &^= C.PARENB
case ParityEven:
st.c_cflag |= C.PARENB
st.c_cflag &^= C.PARODD
case ParityOdd:
st.c_cflag |= C.PARENB
st.c_cflag |= C.PARODD
default:
panic(c.Parity)
}
// Select CRLF translation
if c.CRLFTranslate {
st.c_iflag |= C.ICRNL
} else {
st.c_iflag &^= C.ICRNL
}
// Select raw mode
st.c_lflag &^= C.ICANON | C.ECHO | C.ECHOE | C.ISIG
st.c_oflag &^= C.OPOST
_, err = C.tcsetattr(fd, C.TCSANOW, &st)
if err != nil {
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)
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)
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
}
// Opens and returns a non-blocking serial port.
// The device, baud rate, and SerConf is specified.
//
// Example: rs232.OpenPort("/dev/ttyS0", 115200, rs232.S_8N1)
func OpenPort(port string, baudRate int, serconf SerConf) (*SerialPort, error) {
rv := &SerialPort{}
f, err := os.OpenFile(port,
syscall.O_RDWR|syscall.O_NOCTTY, 0666)
if err != nil {
return nil, err
}
rv.port = f
fd := rv.port.Fd()
var options C.struct_termios
if C.tcgetattr(C.int(fd), &options) < 0 {
defer f.Close()
return nil, fmt.Errorf("tcgetattr failed")
}
if C.cfsetispeed(&options, baudConversion(baudRate)) < 0 {
defer f.Close()
return nil, fmt.Errorf("cfsetispeed failed")
}
if C.cfsetospeed(&options, baudConversion(baudRate)) < 0 {
defer f.Close()
return nil, fmt.Errorf("cfsetospeed failed")
}
switch serconf {
case S_8N1:
{
options.c_cflag &^= C.PARENB
options.c_cflag &^= C.CSTOPB
options.c_cflag &^= C.CSIZE
options.c_cflag |= C.CS8
}
case S_7E1:
{
options.c_cflag |= C.PARENB
options.c_cflag &^= C.PARODD
options.c_cflag &^= C.CSTOPB
options.c_cflag &^= C.CSIZE
options.c_cflag |= C.CS7
}
case S_7O1:
{
options.c_cflag |= C.PARENB
options.c_cflag |= C.PARODD
options.c_cflag &^= C.CSTOPB
options.c_cflag &^= C.CSIZE
options.c_cflag |= C.CS7
}
}
// Local
options.c_cflag |= (C.CLOCAL | C.CREAD)
// no hardware flow control
options.c_cflag &^= C.CRTSCTS
// Don't EOF on a zero read, just block
options.c_cc[C.VMIN] = 1
if C.tcsetattr(C.int(fd), C.TCSANOW, &options) < 0 {
defer f.Close()
return nil, fmt.Errorf("tcsetattr failed")
}
return rv, nil
}
// Opens and returns a non-blocking serial port.
// The device, baud rate, and SerConf is specified.
//
// Example: rs232.OpenPort("/dev/ttyS0", 115200, rs232.S_8N1)
func OpenPort(port string, baudRate int, serconf SerConf) (rv SerialPort, err error) {
f, open_err := os.OpenFile(port,
syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NDELAY,
0666)
if open_err != nil {
err = open_err
return
}
rv.port = f
fd := rv.port.Fd()
var options C.struct_termios
if C.tcgetattr(C.int(fd), &options) < 0 {
panic("tcgetattr failed")
}
if C.cfsetispeed(&options, baudConversion(baudRate)) < 0 {
panic("cfsetispeed failed")
}
if C.cfsetospeed(&options, baudConversion(baudRate)) < 0 {
panic("cfsetospeed failed")
}
switch serconf {
case S_8N1:
{
options.c_cflag &^= C.PARENB
options.c_cflag &^= C.CSTOPB
options.c_cflag &^= C.CSIZE
options.c_cflag |= C.CS8
}
case S_7E1:
{
options.c_cflag |= C.PARENB
options.c_cflag &^= C.PARODD
options.c_cflag &^= C.CSTOPB
options.c_cflag &^= C.CSIZE
options.c_cflag |= C.CS7
}
case S_7O1:
{
options.c_cflag |= C.PARENB
options.c_cflag |= C.PARODD
options.c_cflag &^= C.CSTOPB
options.c_cflag &^= C.CSIZE
options.c_cflag |= C.CS7
}
}
// Local
options.c_cflag |= (C.CLOCAL | C.CREAD)
// no hardware flow control
options.c_cflag &^= C.CRTSCTS
if C.tcsetattr(C.int(fd), C.TCSANOW, &options) < 0 {
panic("tcsetattr failed")
}
if syscall.SetNonblock(int(fd), false) != nil {
panic("Error disabling blocking")
}
return
}
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
}
func (s *Serial) SetBaud(b uint32) {
if s.Opened {
var tios C.struct_termios
getTermios(s.f, &tios)
var baud C.speed_t
switch b {
case 0:
baud = C.B0
case 50:
baud = C.B50
case 75:
baud = C.B75
case 110:
baud = C.B110
case 134:
baud = C.B134
case 150:
baud = C.B150
case 200:
baud = C.B200
case 300:
baud = C.B300
case 600:
baud = C.B600
case 1200:
baud = C.B1200
case 1800:
baud = C.B1800
case 2400:
baud = C.B2400
case 4800:
baud = C.B4800
case 9600:
baud = C.B9600
case 19200:
baud = C.B19200
case 38400:
baud = C.B38400
case 57600:
baud = C.B57600
case 115200:
baud = C.B115200
case 230400:
baud = C.B230400
case 460800:
baud = C.B460800
case 500000:
baud = C.B500000
case 576000:
baud = C.B576000
case 921600:
baud = C.B921600
case 1000000:
baud = C.B1000000
case 1152000:
baud = C.B1152000
case 1500000:
baud = C.B1500000
case 2000000:
baud = C.B2000000
case 2500000:
baud = C.B2500000
case 3000000:
baud = C.B3000000
case 3500000:
baud = C.B3500000
case 4000000:
baud = C.B4000000
default:
baud = 10000000
}
if baud != 10000000 {
C.cfsetispeed(&tios, baud)
C.cfsetospeed(&tios, baud)
setTermios(s.f, &tios)
}
}
}
// Cfsetospeed sets the output baud rate stored in the termios structure.
func Cfsetospeed(attr *syscall.Termios, speed uintptr) error {
solTermios := (*unix.Termios)(attr)
_, err := C.cfsetospeed((*C.termios_t)(unsafe.Pointer(solTermios)), C.speed_t(speed))
return err
}