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//
// Copyright 2014-2023 Cristian Maglie. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
package serial
import "golang.org/x/sys/unix"
const devFolder = "/dev"
const regexFilter = "(ttyS|ttyHS|ttyUSB|ttyACM|ttyAMA|rfcomm|ttyO|ttymxc)[0-9]{1,3}"
// termios manipulation functions
var baudrateMap = map[int]uint32{
0: unix.B9600, // Default to 9600
50: unix.B50,
75: unix.B75,
110: unix.B110,
134: unix.B134,
150: unix.B150,
200: unix.B200,
300: unix.B300,
600: unix.B600,
1200: unix.B1200,
1800: unix.B1800,
2400: unix.B2400,
4800: unix.B4800,
9600: unix.B9600,
19200: unix.B19200,
38400: unix.B38400,
57600: unix.B57600,
115200: unix.B115200,
230400: unix.B230400,
460800: unix.B460800,
500000: unix.B500000,
576000: unix.B576000,
921600: unix.B921600,
1000000: unix.B1000000,
1152000: unix.B1152000,
1500000: unix.B1500000,
2000000: unix.B2000000,
2500000: unix.B2500000,
3000000: unix.B3000000,
3500000: unix.B3500000,
4000000: unix.B4000000,
}
var databitsMap = map[int]uint32{
0: unix.CS8, // Default to 8 bits
5: unix.CS5,
6: unix.CS6,
7: unix.CS7,
8: unix.CS8,
}
const tcCMSPAR = unix.CMSPAR
const tcIUCLC = unix.IUCLC
const tcCRTSCTS uint32 = unix.CRTSCTS
const ioctlTcgetattr = unix.TCGETS
const ioctlTcsetattr = unix.TCSETS
const ioctlTcflsh = unix.TCFLSH
const ioctlTioccbrk = unix.TIOCCBRK
const ioctlTiocsbrk = unix.TIOCSBRK
func toTermiosSpeedType(speed uint32) uint32 {
return speed
}
func setTermSettingsBaudrate(speed int, settings *unix.Termios) (error, bool) {
baudrate, ok := baudrateMap[speed]
if !ok {
return nil, true
}
// revert old baudrate
for _, rate := range baudrateMap {
settings.Cflag &^= rate
}
// set new baudrate
settings.Cflag |= baudrate
settings.Ispeed = toTermiosSpeedType(baudrate)
settings.Ospeed = toTermiosSpeedType(baudrate)
return nil, false
}
func (port *unixPort) Drain() error {
// It's not super well documented, but this is the same as calling tcdrain:
// - https://git.musl-libc.org/cgit/musl/tree/src/termios/tcdrain.c
// - https://elixir.bootlin.com/linux/v6.2.8/source/drivers/tty/tty_io.c#L2673
return unix.IoctlSetInt(port.handle, unix.TCSBRK, 1)
}
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