Added SetStopBits (linux only)

serial.go

@@ -23,6 +23,9 @@ type SerialPort interface {
 
 	// Set data bits
 	SetDataBits(bits int) error
+
+	// Set stop bits
+	SetStopBits(bits StopBits) error
 }
 
 type Parity int
@@ -35,6 +38,14 @@ const (
 	PARITY_SPACE
 )
 
+type StopBits int
+
+const (
+	STOPBITS_ONE StopBits = iota
+	STOPBITS_ONEPOINTFIVE
+	STOPBITS_TWO
+)
+
 // Platform independent error type for serial ports
 type SerialPortError struct {
 	err  string

serial_linux.go

@@ -266,6 +266,20 @@ func (port *linuxSerialPort) SetDataBits(bits int) error {
 	return setTermSettings(port.Handle, settings)
 }
 
+func (port *linuxSerialPort) SetStopBits(bits StopBits) error {
+	settings, err := getTermSettings(port.Handle)
+	if err != nil {
+		return err
+	}
+	switch bits {
+	case STOPBITS_ONE:
+		settings.c_cflag &= ^C.tcflag_t(syscall.CSTOPB)
+	case STOPBITS_ONEPOINTFIVE, STOPBITS_TWO:
+		settings.c_cflag |= syscall.CSTOPB
+	}
+	return setTermSettings(port.Handle, settings)
+}
+
 func OpenPort(portName string, exclusive bool) (SerialPort, error) {
 	handle, err := syscall.Open(portName, syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_NDELAY, 0)
 	if err != nil {

test/serial_test.go

@@ -36,7 +36,9 @@ func ExampleCommunication() {
 	if err := port.SetDataBits(8); err != nil {
 		log.Fatal(err)
 	}
-
+	if err := port.SetStopBits(serial.STOPBITS_ONE); err != nil {
+		log.Fatal(err)
+	}
 	n, err := port.Write([]byte("10,20,30\n\r"))
 	if err != nil {
 		log.Fatal(err)