250 lines
8.2 KiB
Python
250 lines
8.2 KiB
Python
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#!jython
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#
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# Backend Jython with JavaComm
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#
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# This file is part of pySerial. https://github.com/pyserial/pyserial
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# (C) 2002-2015 Chris Liechti <cliechti@gmx.net>
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#
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# SPDX-License-Identifier: BSD-3-Clause
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from serial.serialutil import *
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def my_import(name):
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mod = __import__(name)
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components = name.split('.')
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for comp in components[1:]:
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mod = getattr(mod, comp)
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return mod
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def detect_java_comm(names):
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"""try given list of modules and return that imports"""
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for name in names:
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try:
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mod = my_import(name)
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mod.SerialPort
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return mod
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except (ImportError, AttributeError):
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pass
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raise ImportError("No Java Communications API implementation found")
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# Java Communications API implementations
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# http://mho.republika.pl/java/comm/
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comm = detect_java_comm([
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'javax.comm', # Sun/IBM
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'gnu.io', # RXTX
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])
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def device(portnumber):
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"""Turn a port number into a device name"""
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enum = 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() == comm.CommPortIdentifier.PORT_SERIAL:
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ports.append(el)
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return ports[portnumber].getName()
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class Serial(SerialBase):
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"""\
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Serial port class, implemented with Java Communications API and
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thus usable with jython and the appropriate java extension.
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"""
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def open(self):
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"""\
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Open port with current settings. This may throw a SerialException
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if the port cannot be opened.
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"""
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if self._port is None:
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raise SerialException("Port must be configured before it can be used.")
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if self.is_open:
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raise SerialException("Port is already open.")
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if type(self._port) == type(''): # strings are taken directly
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portId = comm.CommPortIdentifier.getPortIdentifier(self._port)
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else:
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portId = comm.CommPortIdentifier.getPortIdentifier(device(self._port)) # numbers are transformed to a comport id obj
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try:
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self.sPort = portId.open("python serial module", 10)
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except Exception as msg:
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self.sPort = None
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raise SerialException("Could not open port: %s" % msg)
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self._reconfigurePort()
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self._instream = self.sPort.getInputStream()
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self._outstream = self.sPort.getOutputStream()
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self.is_open = True
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def _reconfigurePort(self):
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"""Set communication parameters on opened port."""
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if not self.sPort:
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raise SerialException("Can only operate on a valid port handle")
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self.sPort.enableReceiveTimeout(30)
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if self._bytesize == FIVEBITS:
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jdatabits = comm.SerialPort.DATABITS_5
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elif self._bytesize == SIXBITS:
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jdatabits = comm.SerialPort.DATABITS_6
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elif self._bytesize == SEVENBITS:
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jdatabits = comm.SerialPort.DATABITS_7
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elif self._bytesize == EIGHTBITS:
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jdatabits = comm.SerialPort.DATABITS_8
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else:
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raise ValueError("unsupported bytesize: %r" % self._bytesize)
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if self._stopbits == STOPBITS_ONE:
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jstopbits = comm.SerialPort.STOPBITS_1
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elif self._stopbits == STOPBITS_ONE_POINT_FIVE:
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jstopbits = comm.SerialPort.STOPBITS_1_5
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elif self._stopbits == STOPBITS_TWO:
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jstopbits = comm.SerialPort.STOPBITS_2
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else:
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raise ValueError("unsupported number of stopbits: %r" % self._stopbits)
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if self._parity == PARITY_NONE:
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jparity = comm.SerialPort.PARITY_NONE
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elif self._parity == PARITY_EVEN:
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jparity = comm.SerialPort.PARITY_EVEN
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elif self._parity == PARITY_ODD:
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jparity = comm.SerialPort.PARITY_ODD
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elif self._parity == PARITY_MARK:
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jparity = comm.SerialPort.PARITY_MARK
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elif self._parity == PARITY_SPACE:
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jparity = comm.SerialPort.PARITY_SPACE
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else:
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raise ValueError("unsupported parity type: %r" % self._parity)
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jflowin = jflowout = 0
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if self._rtscts:
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jflowin |= comm.SerialPort.FLOWCONTROL_RTSCTS_IN
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jflowout |= comm.SerialPort.FLOWCONTROL_RTSCTS_OUT
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if self._xonxoff:
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jflowin |= comm.SerialPort.FLOWCONTROL_XONXOFF_IN
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jflowout |= comm.SerialPort.FLOWCONTROL_XONXOFF_OUT
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self.sPort.setSerialPortParams(self._baudrate, jdatabits, jstopbits, jparity)
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self.sPort.setFlowControlMode(jflowin | jflowout)
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if self._timeout >= 0:
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self.sPort.enableReceiveTimeout(int(self._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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"""Close port"""
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if self.is_open:
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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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self.is_open = False
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# - - - - - - - - - - - - - - - - - - - - - - - -
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@property
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def in_waiting(self):
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"""Return the number of characters currently in the input buffer."""
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if not self.sPort:
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raise portNotOpenError
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return self._instream.available()
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def read(self, size=1):
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"""\
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Read size bytes from the serial port. If a timeout is set it may
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return less characters as requested. With no timeout it will block
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until the requested number of bytes is read.
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"""
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if not self.sPort:
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raise portNotOpenError
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read = bytearray()
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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.append(x)
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return bytes(read)
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def write(self, data):
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"""Output the given string over the serial port."""
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if not self.sPort:
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raise portNotOpenError
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if not isinstance(data, (bytes, bytearray)):
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raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data)))
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self._outstream.write(data)
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return len(data)
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def reset_input_buffer(self):
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"""Clear input buffer, discarding all that is in the buffer."""
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if not self.sPort:
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raise portNotOpenError
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self._instream.skip(self._instream.available())
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def reset_output_buffer(self):
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"""\
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Clear output buffer, aborting the current output and
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discarding all that is in the buffer.
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"""
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if not self.sPort:
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raise portNotOpenError
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self._outstream.flush()
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def send_break(self, duration=0.25):
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"""Send break condition. Timed, returns to idle state after given duration."""
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if not self.sPort:
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raise portNotOpenError
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self.sPort.sendBreak(duration*1000.0)
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def _update_break_state(self):
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"""Set break: Controls TXD. When active, to transmitting is possible."""
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if self.fd is None:
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raise portNotOpenError
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raise SerialException("The _update_break_state function is not implemented in java.")
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def _update_rts_state(self):
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"""Set terminal status line: Request To Send"""
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if not self.sPort:
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raise portNotOpenError
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self.sPort.setRTS(self._rts_state)
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def _update_dtr_state(self):
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"""Set terminal status line: Data Terminal Ready"""
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if not self.sPort:
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raise portNotOpenError
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self.sPort.setDTR(self._dtr_state)
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@property
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def cts(self):
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"""Read terminal status line: Clear To Send"""
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if not self.sPort:
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raise portNotOpenError
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self.sPort.isCTS()
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@property
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def dsr(self):
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"""Read terminal status line: Data Set Ready"""
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if not self.sPort:
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raise portNotOpenError
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self.sPort.isDSR()
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@property
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def ri(self):
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"""Read terminal status line: Ring Indicator"""
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if not self.sPort:
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raise portNotOpenError
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self.sPort.isRI()
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@property
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def cd(self):
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"""Read terminal status line: Carrier Detect"""
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if not self.sPort:
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raise portNotOpenError
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self.sPort.isCD()
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