func setTermSettingsCtsRts(enable bool, settings *syscall.Termios) {
if enable {
settings.Cflag |= termiosMask(tcCRTSCTS)
} else {
settings.Cflag &= ^termiosMask(tcCRTSCTS)
}
}
func (s *Screen) Init() error {
var err error
ttyIn, err = os.OpenFile("/dev/tty", os.O_RDWR, 0666)
if err != nil {
return err
}
ttyOut, err = os.OpenFile("/dev/tty", os.O_RDONLY, 0666)
if err != nil {
return err
}
orig = new(syscall.Termios)
err = tcgetattr(ttyIn.Fd(), orig)
if err != nil {
return err
}
tios := new(syscall.Termios)
*tios = *orig
tios.Iflag &= ^uint32(syscall.ECHO | syscall.ICANON | syscall.IEXTEN | syscall.ISIG)
tios.Iflag &= ^uint32(syscall.BRKINT | syscall.ICRNL | syscall.ISTRIP | syscall.IXON)
tios.Cflag &= ^uint32(syscall.CSIZE | syscall.PARENB)
tios.Cflag |= syscall.CS8
tios.Oflag &= ^uint32(syscall.OPOST)
tios.Cc[syscall.VMIN] = 1
tios.Cc[syscall.VTIME] = 0
err = tcsetattr(ttyIn.Fd(), tios)
if err != nil {
return err
}
s.HideCursor()
s.Clear()
return nil
}
// Cfmakeraw modifies attr for raw mode.
func Cfmakeraw(attr *syscall.Termios) {
attr.Iflag &^= syscall.BRKINT | syscall.ICRNL | syscall.INPCK | syscall.ISTRIP | syscall.IXON
attr.Oflag &^= syscall.OPOST
attr.Cflag &^= syscall.CSIZE | syscall.PARENB
attr.Cflag |= syscall.CS8
attr.Lflag &^= syscall.ECHO | syscall.ICANON | syscall.IEXTEN | syscall.ISIG
attr.Cc[syscall.VMIN] = 1
attr.Cc[syscall.VTIME] = 0
}
func setTermSettingsStopBits(bits StopBits, settings *syscall.Termios) error {
switch bits {
case OneStopBit:
settings.Cflag &= ^termiosMask(syscall.CSTOPB)
case OnePointFiveStopBits, TwoStopBits:
settings.Cflag |= termiosMask(syscall.CSTOPB)
}
return nil
}
func setTermSettingsStopBits(bits StopBits, settings *syscall.Termios) error {
switch bits {
case STOPBITS_ONE:
settings.Cflag &= ^termiosMask(syscall.CSTOPB)
case STOPBITS_ONEPOINTFIVE, STOPBITS_TWO:
settings.Cflag |= termiosMask(syscall.CSTOPB)
}
return nil
}
func setTermSettingsDataBits(bits int, settings *syscall.Termios) error {
databits, ok := databitsMap[bits]
if !ok {
return &SerialPortError{code: ERROR_INVALID_PORT_DATA_BITS}
}
settings.Cflag &= ^termiosMask(syscall.CSIZE)
settings.Cflag |= termiosMask(databits)
return nil
}
func setTermSettingsDataBits(bits int, settings *syscall.Termios) error {
databits, ok := databitsMap[bits]
if !ok {
return &PortError{code: InvalidDataBits}
}
settings.Cflag &= ^termiosMask(syscall.CSIZE)
settings.Cflag |= termiosMask(databits)
return nil
}
func OpenSerial(device string, baud uint) (s *serial, err error) {
myBaud := getBaud(baud)
if myBaud == 0 {
err = errInvalidBaud
return
}
fd, err := syscall.Open(
device,
os.O_RDWR|syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NDELAY|syscall.O_NONBLOCK,
0666)
if err != nil {
return
}
defer func() {
if err != nil {
syscall.Close(fd)
}
}()
term := syscall.Termios{}
if err = sys.Ioctl(uintptr(fd), syscall.TCGETS, uintptr(unsafe.Pointer(&term))); err != nil {
return
}
term.Ispeed = myBaud
term.Ospeed = myBaud
term.Cflag |= (syscall.CLOCAL | syscall.CREAD)
term.Cflag = uint32(int32(term.Cflag) & ^syscall.PARENB & ^syscall.CSTOPB & ^syscall.CSIZE)
term.Cflag |= syscall.CS8
term.Lflag = uint32(int32(term.Lflag) & ^(syscall.ICANON | syscall.ECHO | syscall.ECHOE | syscall.ISIG))
term.Oflag = uint32(int32(term.Oflag) & ^syscall.OPOST)
term.Cc[syscall.VMIN] = 0
term.Cc[syscall.VTIME] = 100
if err = sys.Ioctl(uintptr(fd), syscall.TCSETS, uintptr(unsafe.Pointer(&term))); err != nil {
return
}
status := 0
if err = sys.Ioctl(uintptr(fd), syscall.TIOCMGET, uintptr(unsafe.Pointer(&status))); err != nil {
return
}
status |= syscall.TIOCM_DTR | syscall.TIOCM_RTS
if err = sys.Ioctl(uintptr(fd), syscall.TIOCMSET, uintptr(unsafe.Pointer(&status))); err != nil {
return
}
s = &serial{uintptr(fd)}
runtime.SetFinalizer(s, func(this *serial) {
this.Close()
})
return
}
func (c *cflagSetter) Set(pty *os.File, termios *syscall.Termios, value uint32) error {
switch c.Flag {
// CSIZE is a field
case syscall.CS7, syscall.CS8:
termios.Cflag &^= syscall.CSIZE
termios.Cflag |= c.Flag
default:
if value == 0 {
termios.Cflag &^= c.Flag
} else {
termios.Cflag |= c.Flag
}
}
return SetAttr(pty, termios)
}
func setTermSettingsBaudrate(speed int, settings *syscall.Termios) error {
baudrate, ok := baudrateMap[speed]
if !ok {
return &PortError{code: InvalidSpeed}
}
// revert old baudrate
var BAUDMASK uint
for _, rate := range baudrateMap {
BAUDMASK |= rate
}
settings.Cflag &= ^termiosMask(BAUDMASK)
// set new baudrate
settings.Cflag |= termiosMask(baudrate)
settings.Ispeed = termiosMask(baudrate)
settings.Ospeed = termiosMask(baudrate)
return nil
}
func setTermSettingsBaudrate(speed int, settings *syscall.Termios) error {
baudrate, ok := baudrateMap[speed]
if !ok {
return &SerialPortError{code: ERROR_INVALID_PORT_SPEED}
}
// revert old baudrate
BAUDMASK := 0
for _, rate := range baudrateMap {
BAUDMASK |= rate
}
settings.Cflag &= ^termiosMask(BAUDMASK)
// set new baudrate
settings.Cflag |= termiosMask(baudrate)
settings.Ispeed = termiosMask(baudrate)
settings.Ospeed = termiosMask(baudrate)
return nil
}
// Configure configures f as a 8N1 serial port with the specified baudrate.
func Configure(f fder, baudrate uint32) error {
var termios syscall.Termios
if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(f.Fd()), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&termios))); err != 0 {
return err
}
termios.Ispeed = baudrate
termios.Ospeed = baudrate
termios.Cflag &^= CBAUD
termios.Cflag &^= CBAUDEX
termios.Cflag |= baudrate
// set 8N1
termios.Cflag &^= syscall.PARENB
termios.Cflag &^= syscall.CSTOPB
termios.Cflag &^= syscall.CSIZE
termios.Cflag |= syscall.CS8
// Local connection, no modem control
termios.Cflag |= (syscall.CLOCAL | syscall.CREAD)
// Disable hardware flow control
termios.Cflag &^= CRTSCTS
// Block on a zero read (instead of returning EOF)
termios.Cc[syscall.VMIN] = 1
if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(f.Fd()), syscall.TCSETS, uintptr(unsafe.Pointer(&termios))); err != 0 {
return err
}
return nil
}
func setRawMode(settings *syscall.Termios) {
// Set local mode
settings.Cflag |= termiosMask(syscall.CREAD | syscall.CLOCAL)
// Set raw mode
settings.Lflag &= ^termiosMask(syscall.ICANON | syscall.ECHO | syscall.ECHOE | syscall.ECHOK |
syscall.ECHONL | syscall.ECHOCTL | syscall.ECHOPRT | syscall.ECHOKE | syscall.ISIG | syscall.IEXTEN)
settings.Iflag &= ^termiosMask(syscall.IXON | syscall.IXOFF | syscall.IXANY | syscall.INPCK |
syscall.IGNPAR | syscall.PARMRK | syscall.ISTRIP | syscall.IGNBRK | syscall.BRKINT | syscall.INLCR |
syscall.IGNCR | syscall.ICRNL | tcIUCLC)
settings.Oflag &= ^termiosMask(syscall.OPOST)
// Block reads until at least one char is available (no timeout)
settings.Cc[syscall.VMIN] = 1
settings.Cc[syscall.VTIME] = 0
}
func setRawMode(settings *syscall.Termios, mode *Mode) {
// Set local mode
settings.Cflag |= termiosMask(syscall.CREAD | syscall.CLOCAL)
// Set raw mode
settings.Lflag &= ^termiosMask(syscall.ICANON | syscall.ECHO | syscall.ECHOE | syscall.ECHOK |
syscall.ECHONL | syscall.ECHOCTL | syscall.ECHOPRT | syscall.ECHOKE | syscall.ISIG | syscall.IEXTEN)
settings.Iflag &= ^termiosMask(syscall.IXON | syscall.IXOFF | syscall.IXANY | syscall.INPCK |
syscall.IGNPAR | syscall.PARMRK | syscall.ISTRIP | syscall.IGNBRK | syscall.BRKINT | syscall.INLCR |
syscall.IGNCR | syscall.ICRNL | tc_IUCLC)
settings.Oflag &= ^termiosMask(syscall.OPOST)
if mode.Vmin == 0 && mode.Vtimeout == 0 {
// Switch to default mode
// Block reads until at least one char is available (no timeout)
mode.Vmin = 1
}
settings.Cc[syscall.VMIN] = mode.Vmin
settings.Cc[syscall.VTIME] = mode.Vtimeout
}
func setTermSettingsParity(parity Parity, settings *syscall.Termios) error {
switch parity {
case PARITY_NONE:
settings.Cflag &= ^termiosMask(syscall.PARENB | syscall.PARODD | tc_CMSPAR)
settings.Iflag &= ^termiosMask(syscall.INPCK)
case PARITY_ODD:
settings.Cflag |= termiosMask(syscall.PARENB | syscall.PARODD)
settings.Cflag &= ^termiosMask(tc_CMSPAR)
settings.Iflag |= termiosMask(syscall.INPCK)
case PARITY_EVEN:
settings.Cflag &= ^termiosMask(syscall.PARODD | tc_CMSPAR)
settings.Cflag |= termiosMask(syscall.PARENB)
settings.Iflag |= termiosMask(syscall.INPCK)
case PARITY_MARK:
settings.Cflag |= termiosMask(syscall.PARENB | syscall.PARODD | tc_CMSPAR)
settings.Iflag |= termiosMask(syscall.INPCK)
case PARITY_SPACE:
settings.Cflag &= ^termiosMask(syscall.PARODD)
settings.Cflag |= termiosMask(syscall.PARENB | tc_CMSPAR)
settings.Iflag |= termiosMask(syscall.INPCK)
}
return nil
}
// Open a connection with a read timeout.
func (connection *Connection) Open(timeout uint8) error {
var err error
// The serial port is basically a file we are writing to and reading from.
// O_RDWR allows the program to read and write the file.
// O_NOCTTY prevents the device from controlling the terminal.
// O_NONBLOCK prevents the system from blocking for a long time.
connection.f, err = os.OpenFile(connection.Port,
syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
if err != nil {
return err
}
// Close the file on error occurrence.
defer func() {
if err != nil && connection.f != nil {
connection.f.Close()
}
}()
// Create a plain termios, which allows the program to execute
// input/output operations.
termios := syscall.Termios{}
// Setup the baud rate in the termios structure.
baudrate := baudrates[connection.Baud]
termios.Cflag |= baudrate
termios.Ispeed = baudrate
termios.Ospeed = baudrate
// Setup stop bits in the termios structure.
switch connection.StopBit {
case StopBit1:
termios.Cflag &^= syscall.CSTOPB // CSTOPB = 0x40
case StopBit2:
termios.Cflag |= syscall.CSTOPB
default:
return errStopBit
}
// Setup data bits in the termios structure.
databit := databits[connection.DataBit]
termios.Cflag |= databit
// Setup parity in the termios structure.
switch connection.Parity {
case ParityNone:
termios.Cflag &^= syscall.PARENB // PARENB = 0x100
case ParityEven:
termios.Cflag |= syscall.PARENB
case ParityOdd:
termios.Cflag |= syscall.PARENB
termios.Cflag |= syscall.PARODD // PARODD = 0x200
default:
return errParity
}
// // set blocking / non-blocking read
vmin := uint8(0)
if timeout == 0 {
vmin = 1
}
// Attach min bytes and timeout to the termios structure.
termios.Cc = [32]uint8{
syscall.VMIN: vmin, // min bytes per transfer
syscall.VTIME: timeout, // actual read timeout in deciseconds
}
// Execute IOCTL with the modified termios structure to apply the changes.
if _, _, errno := syscall.Syscall6(
// device-specific input/output operations
syscall.SYS_IOCTL,
// open file descriptor
uintptr(connection.f.Fd()),
// a request code number to set the current serial port settings
uintptr(syscall.TCSETS),
//TODO: it looks like syscall.TCSETS is not available under
// freebsd and darwin. Is this a bug?
uintptr(unsafe.Pointer(&termios)), // a pointer to the termios structure
0,
0,
0,
); errno != 0 {
return errno
}
connection.isOpen = true
return nil
}
func setTermSettingsParity(parity Parity, settings *syscall.Termios) error {
switch parity {
case NoParity:
settings.Cflag &= ^termiosMask(syscall.PARENB | syscall.PARODD | tcCMSPAR)
settings.Iflag &= ^termiosMask(syscall.INPCK)
case OddParity:
settings.Cflag |= termiosMask(syscall.PARENB | syscall.PARODD)
settings.Cflag &= ^termiosMask(tcCMSPAR)
settings.Iflag |= termiosMask(syscall.INPCK)
case EvenParity:
settings.Cflag &= ^termiosMask(syscall.PARODD | tcCMSPAR)
settings.Cflag |= termiosMask(syscall.PARENB)
settings.Iflag |= termiosMask(syscall.INPCK)
case MarkParity:
settings.Cflag |= termiosMask(syscall.PARENB | syscall.PARODD | tcCMSPAR)
settings.Iflag |= termiosMask(syscall.INPCK)
case SpaceParity:
settings.Cflag &= ^termiosMask(syscall.PARODD)
settings.Cflag |= termiosMask(syscall.PARENB | tcCMSPAR)
settings.Iflag |= termiosMask(syscall.INPCK)
}
return nil
}