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#!jython
#Python Serial Port Extension for Win32, Linux, BSD, Jython
#module for serial IO for Jython and JavaComm
#see __init__.py
#
#(C) 2002-2003 Chris Liechti <cliechti@gmx.net>
# this is distributed under a free software license, see license.txt
import javax.comm
from serialutil import *
VERSION = "$Revision: 1.8 $".split()[1] #extract CVS version
def device(portnumber):
"""Turn a port number into a device name"""
enum = javax.comm.CommPortIdentifier.getPortIdentifiers()
ports = []
while enum.hasMoreElements():
el = enum.nextElement()
if el.getPortType() == javax.comm.CommPortIdentifier.PORT_SERIAL:
ports.append(el)
return ports[portnumber].getName()
class Serial(SerialBase):
"""Serial port class, implemented with javax.comm and thus usable with
jython and the appropriate java extension."""
def open(self):
"""Open port with current settings. This may throw a SerialException
if the port cannot be opened."""
if self._port is None:
raise SerialException("Port must be configured before it can be used.")
if type(self._port) == type(''): #strings are taken directly
portId = javax.comm.CommPortIdentifier.getPortIdentifier(self._port)
else:
portId = javax.comm.CommPortIdentifier.getPortIdentifier(device(self._port)) #numbers are transformed to a comportid obj
try:
self.sPort = portId.open("python serial module", 10)
except Exception, msg:
self.sPort = None
raise SerialException("Could not open port: %s" % msg)
self._reconfigurePort()
self._instream = self.sPort.getInputStream()
self._outstream = self.sPort.getOutputStream()
self._isOpen = True
def _reconfigurePort(self):
"""Set commuication parameters on opened port."""
if not self.sPort:
raise SerialException("Can only operate on a valid port handle")
self.sPort.enableReceiveTimeout(30)
if self._bytesize == FIVEBITS:
jdatabits = javax.comm.SerialPort.DATABITS_5
elif self._bytesize == SIXBITS:
jdatabits = javax.comm.SerialPort.DATABITS_6
elif self._bytesize == SEVENBITS:
jdatabits = javax.comm.SerialPort.DATABITS_7
elif self._bytesize == EIGHTBITS:
jdatabits = javax.comm.SerialPort.DATABITS_8
else:
raise ValueError("unsupported bytesize: %r" % self._bytesize)
if self._stopbits == STOPBITS_ONE:
jstopbits = javax.comm.SerialPort.STOPBITS_1
elif stopbits == STOPBITS_ONE_HALVE:
self._jstopbits = javax.comm.SerialPort.STOPBITS_1_5
elif self._stopbits == STOPBITS_TWO:
jstopbits = javax.comm.SerialPort.STOPBITS_2
else:
raise ValueError("unsupported number of stopbits: %r" % self._stopbits)
if self._parity == PARITY_NONE:
jparity = javax.comm.SerialPort.PARITY_NONE
elif self._parity == PARITY_EVEN:
jparity = javax.comm.SerialPort.PARITY_EVEN
elif self._parity == PARITY_ODD:
jparity = javax.comm.SerialPort.PARITY_ODD
#~ elif self._parity == PARITY_MARK:
#~ jparity = javax.comm.SerialPort.PARITY_MARK
#~ elif self._parity == PARITY_SPACE:
#~ jparity = javax.comm.SerialPort.PARITY_SPACE
else:
raise ValueError("unsupported parity type: %r" % self._parity)
jflowin = jflowout = 0
if self._rtscts:
jflowin |= javax.comm.SerialPort.FLOWCONTROL_RTSCTS_IN
jflowout |= javax.comm.SerialPort.FLOWCONTROL_RTSCTS_OUT
if self._xonxoff:
jflowin |= javax.comm.SerialPort.FLOWCONTROL_XONXOFF_IN
jflowout |= javax.comm.SerialPort.FLOWCONTROL_XONXOFF_OUT
self.sPort.setSerialPortParams(baudrate, jdatabits, jstopbits, jparity)
self.sPort.setFlowControlMode(jflowin | jflowout)
if self._timeout >= 0:
self.sPort.enableReceiveTimeout(self._timeout*1000)
else:
self.sPort.disableReceiveTimeout()
def close(self):
"""Close port"""
if self._isOpen:
if self.sPort:
self._instream.close()
self._outstream.close()
self.sPort.close()
self.sPort = None
self._isOpen = False
def makeDeviceName(self, port):
return device(port)
# - - - - - - - - - - - - - - - - - - - - - - - -
def inWaiting(self):
"""Return the number of characters currently in the input buffer."""
if not self.sPort: raise portNotOpenError
return self._instream.available()
def read(self, size=1):
"""Read size bytes from the serial port. If a timeout is set it may
return less characters as requested. With no timeout it will block
until the requested number of bytes is read."""
if not self.sPort: raise portNotOpenError
read = ''
if size > 0:
while len(read) < size:
x = self._instream.read()
if x == -1:
if self.timeout >= 0:
break
else:
read = read + chr(x)
return read
def write(self, data):
"""Output the given string over the serial port."""
if not self.sPort: raise portNotOpenError
self._outstream.write(data)
def flushInput(self):
"""Clear input buffer, discarding all that is in the buffer."""
if not self.sPort: raise portNotOpenError
self._instream.skip(self._instream.available())
def flushOutput(self):
"""Clear output buffer, aborting the current output and
discarding all that is in the buffer."""
if not self.sPort: raise portNotOpenError
self._outstream.flush()
def sendBreak(self):
"""Send break condition."""
if not self.sPort: raise portNotOpenError
self.sPort.sendBreak()
def setRTS(self,on=1):
"""Set terminal status line: Request To Send"""
if not self.sPort: raise portNotOpenError
self.sPort.setRTS(on)
def setDTR(self,on=1):
"""Set terminal status line: Data Terminal Ready"""
if not self.sPort: raise portNotOpenError
self.sPort.setDTR(on)
def getCTS(self):
"""Read terminal status line: Clear To Send"""
if not self.sPort: raise portNotOpenError
self.sPort.isCTS()
def getDSR(self):
"""Read terminal status line: Data Set Ready"""
if not self.sPort: raise portNotOpenError
self.sPort.isDSR()
def getRI(self):
"""Read terminal status line: Ring Indicator"""
if not self.sPort: raise portNotOpenError
self.sPort.isRI()
def getCD(self):
"""Read terminal status line: Carrier Detect"""
if not self.sPort: raise portNotOpenError
self.sPort.isCD()
if __name__ == '__main__':
s = Serial(0,
baudrate=19200, #baudrate
bytesize=EIGHTBITS, #number of databits
parity=PARITY_EVEN, #enable parity checking
stopbits=STOPBITS_ONE, #number of stopbits
timeout=3, #set a timeout value, None for waiting forever
xonxoff=0, #enable software flow control
rtscts=0, #enable RTS/CTS flow control
)
s.setRTS(1)
s.setDTR(1)
s.flushInput()
s.flushOutput()
s.write('hello')
print repr(s.read(5))
print s.inWaiting()
del s
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