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편집 파일: serialcli.py

#! python # # Backend for .NET/Mono (IronPython), .NET >= 2 # # This file is part of pySerial. https://github.com/pyserial/pyserial # (C) 2008-2015 Chris Liechti <cliechti@gmx.net> # # SPDX-License-Identifier: BSD-3-Clause import System import System.IO.Ports from serial.serialutil import * # must invoke function with byte array, make a helper to convert strings # to byte arrays sab = System.Array[System.Byte] def as_byte_array(string): return sab([ord(x) for x in string]) # XXX will require adaption when run with a 3.x compatible IronPython class Serial(SerialBase): """Serial port implementation for .NET/Mono.""" BAUDRATES = (50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200) 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.") try: self._port_handle = System.IO.Ports.SerialPort(self.portstr) except Exception as msg: self._port_handle = None raise SerialException("could not open port %s: %s" % (self.portstr, msg)) # if RTS and/or DTR are not set before open, they default to True if self._rts_state is None: self._rts_state = True if self._dtr_state is None: self._dtr_state = True self._reconfigure_port() self._port_handle.Open() self.is_open = True if not self._dsrdtr: self._update_dtr_state() if not self._rtscts: self._update_rts_state() self.reset_input_buffer() def _reconfigure_port(self): """Set communication parameters on opened port.""" if not self._port_handle: raise SerialException("Can only operate on a valid port handle") #~ self._port_handle.ReceivedBytesThreshold = 1 if self._timeout is None: self._port_handle.ReadTimeout = System.IO.Ports.SerialPort.InfiniteTimeout else: self._port_handle.ReadTimeout = int(self._timeout * 1000) # if self._timeout != 0 and self._interCharTimeout is not None: # timeouts = (int(self._interCharTimeout * 1000),) + timeouts[1:] if self._write_timeout is None: self._port_handle.WriteTimeout = System.IO.Ports.SerialPort.InfiniteTimeout else: self._port_handle.WriteTimeout = int(self._write_timeout * 1000) # Setup the connection info. try: self._port_handle.BaudRate = self._baudrate except IOError as e: # catch errors from illegal baudrate settings raise ValueError(str(e)) if self._bytesize == FIVEBITS: self._port_handle.DataBits = 5 elif self._bytesize == SIXBITS: self._port_handle.DataBits = 6 elif self._bytesize == SEVENBITS: self._port_handle.DataBits = 7 elif self._bytesize == EIGHTBITS: self._port_handle.DataBits = 8 else: raise ValueError("Unsupported number of data bits: %r" % self._bytesize) if self._parity == PARITY_NONE: self._port_handle.Parity = getattr(System.IO.Ports.Parity, 'None') # reserved keyword in Py3k elif self._parity == PARITY_EVEN: self._port_handle.Parity = System.IO.Ports.Parity.Even elif self._parity == PARITY_ODD: self._port_handle.Parity = System.IO.Ports.Parity.Odd elif self._parity == PARITY_MARK: self._port_handle.Parity = System.IO.Ports.Parity.Mark elif self._parity == PARITY_SPACE: self._port_handle.Parity = System.IO.Ports.Parity.Space else: raise ValueError("Unsupported parity mode: %r" % self._parity) if self._stopbits == STOPBITS_ONE: self._port_handle.StopBits = System.IO.Ports.StopBits.One elif self._stopbits == STOPBITS_ONE_POINT_FIVE: self._port_handle.StopBits = System.IO.Ports.StopBits.OnePointFive elif self._stopbits == STOPBITS_TWO: self._port_handle.StopBits = System.IO.Ports.StopBits.Two else: raise ValueError("Unsupported number of stop bits: %r" % self._stopbits) if self._rtscts and self._xonxoff: self._port_handle.Handshake = System.IO.Ports.Handshake.RequestToSendXOnXOff elif self._rtscts: self._port_handle.Handshake = System.IO.Ports.Handshake.RequestToSend elif self._xonxoff: self._port_handle.Handshake = System.IO.Ports.Handshake.XOnXOff else: self._port_handle.Handshake = getattr(System.IO.Ports.Handshake, 'None') # reserved keyword in Py3k #~ def __del__(self): #~ self.close() def close(self): """Close port""" if self.is_open: if self._port_handle: try: self._port_handle.Close() except System.IO.Ports.InvalidOperationException: # ignore errors. can happen for unplugged USB serial devices pass self._port_handle = None self.is_open = False # - - - - - - - - - - - - - - - - - - - - - - - - @property def in_waiting(self): """Return the number of characters currently in the input buffer.""" if not self.is_open: raise portNotOpenError return self._port_handle.BytesToRead 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.is_open: raise portNotOpenError # must use single byte reads as this is the only way to read # without applying encodings data = bytearray() while size: try: data.append(self._port_handle.ReadByte()) except System.TimeoutException: break else: size -= 1 return bytes(data) def write(self, data): """Output the given string over the serial port.""" if not self.is_open: raise portNotOpenError #~ if not isinstance(data, (bytes, bytearray)): #~ raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data))) try: # must call overloaded method with byte array argument # as this is the only one not applying encodings self._port_handle.Write(as_byte_array(data), 0, len(data)) except System.TimeoutException: raise writeTimeoutError return len(data) def reset_input_buffer(self): """Clear input buffer, discarding all that is in the buffer.""" if not self.is_open: raise portNotOpenError self._port_handle.DiscardInBuffer() def reset_output_buffer(self): """\ Clear output buffer, aborting the current output and discarding all that is in the buffer. """ if not self.is_open: raise portNotOpenError self._port_handle.DiscardOutBuffer() def _update_break_state(self): """ Set break: Controls TXD. When active, to transmitting is possible. """ if not self.is_open: raise portNotOpenError self._port_handle.BreakState = bool(self._break_state) def _update_rts_state(self): """Set terminal status line: Request To Send""" if not self.is_open: raise portNotOpenError self._port_handle.RtsEnable = bool(self._rts_state) def _update_dtr_state(self): """Set terminal status line: Data Terminal Ready""" if not self.is_open: raise portNotOpenError self._port_handle.DtrEnable = bool(self._dtr_state) @property def cts(self): """Read terminal status line: Clear To Send""" if not self.is_open: raise portNotOpenError return self._port_handle.CtsHolding @property def dsr(self): """Read terminal status line: Data Set Ready""" if not self.is_open: raise portNotOpenError return self._port_handle.DsrHolding @property def ri(self): """Read terminal status line: Ring Indicator""" if not self.is_open: raise portNotOpenError #~ return self._port_handle.XXX return False # XXX an error would be better @property def cd(self): """Read terminal status line: Carrier Detect""" if not self.is_open: raise portNotOpenError return self._port_handle.CDHolding # - - platform specific - - - - # none