252 lines
8.3 KiB
Python
252 lines
8.3 KiB
Python
#!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()
|