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#!jython # # Backend Jython with JavaComm # # This file is part of pySerial. https://github.com/pyserial/pyserial # (C) 2002-2015 Chris Liechti <cliechti@gmx.net> # # SPDX-License-Identifier: BSD-3-Clause from __future__ import absolute_import 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 Serial(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.is_open: 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 as 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.is_open = 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 self._stopbits == STOPBITS_ONE_POINT_FIVE: 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(int(self._timeout*1000)) else: self.sPort.disableReceiveTimeout() def close(self): """Close port""" if self.is_open: if self.sPort: self._instream.close() self._outstream.close() self.sPort.close() self.sPort = None self.is_open = False # - - - - - - - - - - - - - - - - - - - - - - - - @property def in_waiting(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 reset_input_buffer(self): """Clear input buffer, discarding all that is in the buffer.""" if not self.sPort: raise PortNotOpenError() self._instream.skip(self._instream.available()) def reset_output_buffer(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 send_break(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 _update_break_state(self): """Set break: Controls TXD. When active, to transmitting is possible.""" if self.fd is None: raise PortNotOpenError() raise SerialException("The _update_break_state function is not implemented in java.") def _update_rts_state(self): """Set terminal status line: Request To Send""" if not self.sPort: raise PortNotOpenError() self.sPort.setRTS(self._rts_state) def _update_dtr_state(self): """Set terminal status line: Data Terminal Ready""" if not self.sPort: raise PortNotOpenError() self.sPort.setDTR(self._dtr_state) @property def cts(self): """Read terminal status line: Clear To Send""" if not self.sPort: raise PortNotOpenError() self.sPort.isCTS() @property def dsr(self): """Read terminal status line: Data Set Ready""" if not self.sPort: raise PortNotOpenError() self.sPort.isDSR() @property def ri(self): """Read terminal status line: Ring Indicator""" if not self.sPort: raise PortNotOpenError() self.sPort.isRI() @property def cd(self): """Read terminal status line: Carrier Detect""" if not self.sPort: raise PortNotOpenError() self.sPort.isCD()