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Edit File: serialjava.py

#!jython # # Python Serial Port Extension for Win32, Linux, BSD, Jython # module for serial IO for Jython and JavaComm # see __init__.py # # (C) 2002-2008 Chris Liechti <cliechti@gmx.net> # this is distributed under a free software license, see license.txt from serial.serialutil import * def my_import(name): mod = __import__(name) components = name.split('.') for comp in components[1:]: mod = getattr(mod, comp) return mod def detect_java_comm(names): """try given list of modules and return that imports""" for name in names: try: mod = my_import(name) mod.SerialPort return mod except (ImportError, AttributeError): pass raise ImportError("No Java Communications API implementation found") # Java Communications API implementations # http://mho.republika.pl/java/comm/ comm = detect_java_comm([ 'javax.comm', # Sun/IBM 'gnu.io', # RXTX ]) def device(portnumber): """Turn a port number into a device name""" enum = comm.CommPortIdentifier.getPortIdentifiers() ports = [] while enum.hasMoreElements(): el = enum.nextElement() if el.getPortType() == comm.CommPortIdentifier.PORT_SERIAL: ports.append(el) return ports[portnumber].getName() class JavaSerial(SerialBase): """Serial port class, implemented with Java Communications API 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 self._isOpen: raise SerialException("Port is already open.") if type(self._port) == type(''): # strings are taken directly portId = comm.CommPortIdentifier.getPortIdentifier(self._port) else: portId = comm.CommPortIdentifier.getPortIdentifier(device(self._port)) # numbers are transformed to a comport id 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 communication 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 = comm.SerialPort.DATABITS_5 elif self._bytesize == SIXBITS: jdatabits = comm.SerialPort.DATABITS_6 elif self._bytesize == SEVENBITS: jdatabits = comm.SerialPort.DATABITS_7 elif self._bytesize == EIGHTBITS: jdatabits = comm.SerialPort.DATABITS_8 else: raise ValueError("unsupported bytesize: %r" % self._bytesize) if self._stopbits == STOPBITS_ONE: jstopbits = comm.SerialPort.STOPBITS_1 elif stopbits == STOPBITS_ONE_POINT_FIVE: self._jstopbits = comm.SerialPort.STOPBITS_1_5 elif self._stopbits == STOPBITS_TWO: jstopbits = comm.SerialPort.STOPBITS_2 else: raise ValueError("unsupported number of stopbits: %r" % self._stopbits) if self._parity == PARITY_NONE: jparity = comm.SerialPort.PARITY_NONE elif self._parity == PARITY_EVEN: jparity = comm.SerialPort.PARITY_EVEN elif self._parity == PARITY_ODD: jparity = comm.SerialPort.PARITY_ODD elif self._parity == PARITY_MARK: jparity = comm.SerialPort.PARITY_MARK elif self._parity == PARITY_SPACE: jparity = comm.SerialPort.PARITY_SPACE else: raise ValueError("unsupported parity type: %r" % self._parity) jflowin = jflowout = 0 if self._rtscts: jflowin |= comm.SerialPort.FLOWCONTROL_RTSCTS_IN jflowout |= comm.SerialPort.FLOWCONTROL_RTSCTS_OUT if self._xonxoff: jflowin |= comm.SerialPort.FLOWCONTROL_XONXOFF_IN jflowout |= comm.SerialPort.FLOWCONTROL_XONXOFF_OUT self.sPort.setSerialPortParams(self._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 = bytearray() if size > 0: while len(read) < size: x = self._instream.read() if x == -1: if self.timeout >= 0: break else: read.append(x) return bytes(read) def write(self, data): """Output the given string over the serial port.""" if not self.sPort: raise portNotOpenError if not isinstance(data, (bytes, bytearray)): raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data))) self._outstream.write(data) return len(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, duration=0.25): """Send break condition. Timed, returns to idle state after given duration.""" if not self.sPort: raise portNotOpenError self.sPort.sendBreak(duration*1000.0) def setBreak(self, level=1): """Set break: Controls TXD. When active, to transmitting is possible.""" if self.fd is None: raise portNotOpenError raise SerialException("The setBreak function is not implemented in java.") def setRTS(self, level=1): """Set terminal status line: Request To Send""" if not self.sPort: raise portNotOpenError self.sPort.setRTS(level) def setDTR(self, level=1): """Set terminal status line: Data Terminal Ready""" if not self.sPort: raise portNotOpenError self.sPort.setDTR(level) 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() # assemble Serial class with the platform specific implementation and the base # for file-like behavior. for Python 2.6 and newer, that provide the new I/O # library, derive from io.RawIOBase try: import io except ImportError: # classic version with our own file-like emulation class Serial(JavaSerial, FileLike): pass else: # io library present class Serial(JavaSerial, io.RawIOBase): pass 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') sys.stdio.write('%r\n' % s.read(5)) sys.stdio.write('%s\n' % s.inWaiting()) del s