108 lines
2.0 KiB
Go
108 lines
2.0 KiB
Go
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// +build !windows,cgo
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package serial
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// #include <termios.h>
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// #include <unistd.h>
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import "C"
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// TODO: Maybe change to using syscall package + ioctl instead of cgo
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"syscall"
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//"unsafe"
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)
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func openPort(name string, baud int) (rwc io.ReadWriteCloser, err error) {
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f, err := os.OpenFile(name, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0666)
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if err != nil {
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return
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}
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fd := C.int(f.Fd())
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if C.isatty(fd) != 1 {
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f.Close()
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return nil, errors.New("File is not a tty")
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}
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var st C.struct_termios
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_, err = C.tcgetattr(fd, &st)
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if err != nil {
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f.Close()
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return nil, err
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}
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var speed C.speed_t
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switch baud {
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case 115200:
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speed = C.B115200
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case 57600:
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speed = C.B57600
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case 38400:
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speed = C.B38400
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case 19200:
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speed = C.B19200
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case 9600:
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speed = C.B9600
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case 4800:
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speed = C.B4800
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case 2400:
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speed = C.B2400
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default:
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f.Close()
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return nil, fmt.Errorf("Unknown baud rate %v", baud)
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}
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_, err = C.cfsetispeed(&st, speed)
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if err != nil {
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f.Close()
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return nil, err
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}
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_, err = C.cfsetospeed(&st, speed)
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if err != nil {
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f.Close()
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return nil, err
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}
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// Select local mode
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st.c_cflag |= (C.CLOCAL | C.CREAD)
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// Select raw mode
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st.c_lflag &= ^C.tcflag_t(C.ICANON | C.ECHO | C.ECHOE | C.ISIG)
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st.c_oflag &= ^C.tcflag_t(C.OPOST)
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_, err = C.tcsetattr(fd, C.TCSANOW, &st)
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if err != nil {
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f.Close()
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return nil, err
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}
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//fmt.Println("Tweaking", name)
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r1, _, e := syscall.Syscall(syscall.SYS_FCNTL,
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uintptr(f.Fd()),
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uintptr(syscall.F_SETFL),
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uintptr(0))
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if e != 0 || r1 != 0 {
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s := fmt.Sprint("Clearing NONBLOCK syscall error:", e, r1)
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f.Close()
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return nil, errors.New(s)
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}
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/*
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r1, _, e = syscall.Syscall(syscall.SYS_IOCTL,
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uintptr(f.Fd()),
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uintptr(0x80045402), // IOSSIOSPEED
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uintptr(unsafe.Pointer(&baud)));
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if e != 0 || r1 != 0 {
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s := fmt.Sprint("Baudrate syscall error:", e, r1)
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f.Close()
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return nil, os.NewError(s)
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}
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*/
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return f, nil
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}
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