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SerialSender.py
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SerialSender.py
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import gobject
import os.path
import serial
import logging
LOG = logging.getLogger('libserial.SerialSender')
class SerialSender(gobject.GObject):
__gsignals__ = {
"serial-connected" : (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, [
gobject.TYPE_BOOLEAN]), #True if successfully connected to the port
}
def __init__(self, port="/dev/null", speed=9600, timeout=1):
gobject.GObject.__init__(self)
self._serial = None
self._port = port
self._speed = speed
self._timeout = timeout
self._opened = False
def get_serial(self):
return self._serial
def get_fd(self):
return self._serial.fileno()
def is_open(self):
return self._opened
def connect_to_port(self, port=None, speed=None):
"""
Opens the port
"""
if port: p = port
else: p = self._port
if speed: s = speed
else: s = self._speed
#no-op if same port and speed is selected
if (self._opened == False) or (s != self._speed) or (p != self._port):
LOG.debug("Opening Port: %s @ %d" % (p,s))
if self._serial and self._serial.isOpen():
self._serial.close()
try:
self._serial = serial.Serial(p, s, timeout=self._timeout)
self._serial.flushInput()
self._port = p
self._speed = s
self._opened = self._serial.isOpen()
except serial.SerialException:
self._opened = False
self.on_serial_connected(self._opened)
return self._opened
def disconnect_from_port(self):
if self._opened:
self._serial.close()
self._opened = False
self.on_serial_connected(self._opened)
def read(self, nbytes=5):
if self.is_open():
try:
return self._serial.read(nbytes)
except serial.SerialTimeoutException:
pass
return ""
def write(self, data):
if self.is_open():
self._serial.write(data)
def on_serial_connected(self, connected):
self.emit("serial-connected", connected)