198 lines
7 KiB
Python
198 lines
7 KiB
Python
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#!jython
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#module for serial IO for Jython and JavaComm
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#see __init__.py
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#
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#(C) 2002 Chris Liechti <cliechti@gmx.net>
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# this is distributed under a free software license, see license.txt
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import sys, os, string, javax.comm
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import serialutil
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VERSION = string.split("$Revision: 1.1 $")[1] #extract CVS version
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PARITY_NONE, PARITY_EVEN, PARITY_ODD, PARITY_MARK, PARITY_SPACE = (0,1,2,3,4)
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STOPBITS_ONE, STOPBITS_TWO, STOPBITS_ONE_HALVE = (1, 2, 3)
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FIVEBITS, SIXBITS, SEVENBITS, EIGHTBITS = (5,6,7,8)
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portNotOpenError = ValueError('port not open')
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def device(portnumber):
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enum = javax.comm.CommPortIdentifier.getPortIdentifiers()
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ports = []
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while enum.hasMoreElements():
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el = enum.nextElement()
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if el.getPortType() == javax.comm.CommPortIdentifier.PORT_SERIAL:
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ports.append(el)
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return ports[portnumber]
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class Serial(serialutil.FileLike):
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def __init__(self,
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port, #number of device, numbering starts at
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#zero. if everything fails, the user
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#can specify a device string, note
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#that this isn't portable anymore
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baudrate=9600, #baudrate
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bytesize=EIGHTBITS, #number of databits
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parity=PARITY_NONE, #enable parity checking
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stopbits=STOPBITS_ONE, #number of stopbits
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timeout=None, #set a timeout value, None for waiting forever
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xonxoff=0, #enable software flow control
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rtscts=0, #enable RTS/CTS flow control
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):
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if type(port) == type(''): #strings are taken directly
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portId = javax.comm.CommPortIdentifier.getPortIdentifier(port)
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else:
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portId = device(port) #numbers are transformed to a comportid obj
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self.portstr = portId.getName()
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try:
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self.sPort = portId.open("python serial module", 10)
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except Exception, msg:
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self.sPort = None
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raise serialutil.SerialException, "could not open port: %s" % msg
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self.instream = self.sPort.getInputStream()
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self.outstream = self.sPort.getOutputStream()
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self.sPort.enableReceiveTimeout(30)
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if bytesize == FIVEBITS:
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self.databits = javax.comm.SerialPort.DATABITS_5
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elif bytesize == SIXBITS:
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self.databits = javax.comm.SerialPort.DATABITS_6
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elif bytesize == SEVENBITS:
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self.databits = javax.comm.SerialPort.DATABITS_7
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elif bytesize == EIGHTBITS:
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self.databits = javax.comm.SerialPort.DATABITS_8
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else:
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raise ValueError, "unsupported bytesize"
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if stopbits == STOPBITS_ONE:
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self.jstopbits = javax.comm.SerialPort.STOPBITS_1
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elif stopbits == STOPBITS_ONE_HALVE:
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self.jstopbits = javax.comm.SerialPort.STOPBITS_1_5
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elif stopbits == STOPBITS_TWO:
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self.jstopbits = javax.comm.SerialPort.STOPBITS_2
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else:
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raise ValueError, "unsupported number of stopbits"
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if parity == PARITY_NONE:
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self.jparity = javax.comm.SerialPort.PARITY_NONE
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elif parity == PARITY_EVEN:
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self.jparity = javax.comm.SerialPort.PARITY_EVEN
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elif parity == PARITY_ODD:
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self.jparity = javax.comm.SerialPort.PARITY_ODD
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elif parity == PARITY_MARK:
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self.jparity = javax.comm.SerialPort.PARITY_MARK
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elif parity == PARITY_SPACE:
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self.jparity = javax.comm.SerialPort.PARITY_SPACE
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else:
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raise ValueError, "unsupported parity type"
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jflowin = jflowout = 0
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if rtscts:
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jflowin = jflowin | javax.comm.SerialPort.FLOWCONTROL_RTSCTS_IN
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jflowout = jflowout | javax.comm.SerialPort.FLOWCONTROL_RTSCTS_OUT
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if xonxoff:
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jflowin = jflowin | javax.comm.SerialPort.FLOWCONTROL_XONXOFF_IN
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jflowout = jflowout | javax.comm.SerialPort.FLOWCONTROL_XONXOFF_OUT
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self.sPort.setSerialPortParams(baudrate, self.databits, self.jstopbits, self.jparity)
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self.sPort.setFlowControlMode(jflowin | jflowout)
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self.timeout = timeout
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if timeout >= 0:
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self.sPort.enableReceiveTimeout(timeout*1000)
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else:
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self.sPort.disableReceiveTimeout()
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def close(self):
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if self.sPort:
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self.instream.close()
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self.outstream.close()
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self.sPort.close()
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self.sPort = None
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def setBaudrate(self, baudrate):
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"""change baudrate after port is open"""
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if not self.sPort: raise portNotOpenError
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self.sPort.setSerialPortParams(baudrate, self.databits, self.jstopbits, self.jparity)
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def inWaiting(self):
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if not self.sPort: raise portNotOpenError
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return self.instream.available()
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def write(self, data):
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if not self.sPort: raise portNotOpenError
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self.outstream.write(data)
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def read(self, size=1):
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if not self.sPort: raise portNotOpenError
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read = ''
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if size > 0:
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while len(read) < size:
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x = self.instream.read()
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if x == -1:
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if self.timeout >= 0:
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break
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else:
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read = read + chr(x)
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return read
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def flushInput(self):
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if not self.sPort: raise portNotOpenError
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self.instream.skip(self.instream.available())
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def flushOutput(self):
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if not self.sPort: raise portNotOpenError
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self.outstream.flush()
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def sendBreak(self):
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if not self.sPort: raise portNotOpenError
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self.sPort.sendBreak()
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def getDSR(self):
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if not self.sPort: raise portNotOpenError
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self.sPort.isDSR()
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def getCD(self):
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if not self.sPort: raise portNotOpenError
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self.sPort.isCD()
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def getRI(self):
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if not self.sPort: raise portNotOpenError
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self.sPort.isRI()
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def getCTS(self):
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if not self.sPort: raise portNotOpenError
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self.sPort.isCTS()
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def setDTR(self,on=1):
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if not self.sPort: raise portNotOpenError
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self.sPort.setDTR(on)
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def setRTS(self,on=1):
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if not self.sPort: raise portNotOpenError
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self.sPort.setRTS(on)
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if __name__ == '__main__':
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s = Serial(0,
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baudrate=19200, #baudrate
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bytesize=EIGHTBITS, #number of databits
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parity=PARITY_EVEN, #enable parity checking
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stopbits=STOPBITS_ONE, #number of stopbits
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timeout=3, #set a timeout value, None for waiting forever
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xonxoff=0, #enable software flow control
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rtscts=0, #enable RTS/CTS flow control
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)
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s.setRTS(1)
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s.setDTR(1)
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s.flushInput()
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s.flushOutput()
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s.write('hello')
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print repr(s.read(5))
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print s.inWaiting()
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del s
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