RS232Connection.py

#
#	GammaScoutUtil - Tool to communicate with Gamma Scout Geiger counters.
#	Copyright (C) 2011-2013 Johannes Bauer
#
#	This file is part of GammaScoutUtil.
#
#	GammaScoutUtil is free software; you can redistribute it and/or modify
#	it under the terms of the GNU General Public License as published by
#	the Free Software Foundation; this program is ONLY licensed under
#	version 3 of the License, later versions are explicitly excluded.
#
#	GammaScoutUtil is distributed in the hope that it will be useful,
#	but WITHOUT ANY WARRANTY; without even the implied warranty of
#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#	GNU General Public License for more details.
#
#	You should have received a copy of the GNU General Public License
#	along with GammaScoutUtil; if not, write to the Free Software
#	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#	Johannes Bauer <JohannesBauer@gmx.de>
#

import serial
import logging

from GSConnection import GSConnection
from ReaderThreads import RS232ReaderThread

class RS232Connection(GSConnection):
	def __init__(self, args):
		GSConnection.__init__(self, args)
		self._log = logging.getLogger("gsu.traffic." + self.__class__.__name__)
		baudrate = {
			"v1":		2400,
			"v2":		9600,
		}[args["protocol"]]
		self._conn = serial.Serial(args["device"], baudrate = baudrate, bytesize = 7, parity = "E", stopbits = 1, timeout = 0.1)
		self._rxthread = RS232ReaderThread(self._conn, self._rxbuf.push)
		self._rxthread.start()

	def write(self, data):
		data = data.encode("utf-8")
		self._log.debug("TX %d -> %s" % (len(data), str(data)[1:]))
		self._conn.write(data)

	def close(self):
		self._rxthread.close()