274 lines
9.8 KiB
Python
274 lines
9.8 KiB
Python
#! python
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# Python Serial Port Extension for Win32, Linux, BSD, Jython and .NET/Mono
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# serial driver for .NET/Mono (IronPython), .NET >= 2
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# see __init__.py
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#
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# (C) 2008 Chris Liechti <cliechti@gmx.net>
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# this is distributed under a free software license, see license.txt
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import clr
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import System
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import System.IO.Ports
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from serial.serialutil import *
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def device(portnum):
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"""Turn a port number into a device name"""
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return System.IO.Ports.SerialPort.GetPortNames()[portnum]
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# must invoke function with byte array, make a helper to convert strings
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# to byte arrays
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sab = System.Array[System.Byte]
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def as_byte_array(string):
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return sab([ord(x) for x in string]) # XXX will require adaption when run with a 3.x compatible IronPython
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class IronSerial(SerialBase):
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"""Serial port implementation for .NET/Mono."""
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BAUDRATES = (50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
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9600, 19200, 38400, 57600, 115200)
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def open(self):
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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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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._isOpen:
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raise SerialException("Port is already open.")
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try:
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self._port_handle = System.IO.Ports.SerialPort(self.portstr)
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except Exception, msg:
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self._port_handle = None
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raise SerialException("could not open port %s: %s" % (self.portstr, msg))
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self._reconfigurePort()
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self._port_handle.Open()
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self._isOpen = True
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if not self._rtscts:
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self.setRTS(True)
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self.setDTR(True)
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self.flushInput()
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self.flushOutput()
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def _reconfigurePort(self):
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"""Set communication parameters on opened port."""
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if not self._port_handle:
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raise SerialException("Can only operate on a valid port handle")
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#~ self._port_handle.ReceivedBytesThreshold = 1
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if self._timeout is None:
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self._port_handle.ReadTimeout = System.IO.Ports.SerialPort.InfiniteTimeout
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else:
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self._port_handle.ReadTimeout = int(self._timeout*1000)
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# if self._timeout != 0 and self._interCharTimeout is not None:
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# timeouts = (int(self._interCharTimeout * 1000),) + timeouts[1:]
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if self._writeTimeout is None:
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self._port_handle.WriteTimeout = System.IO.Ports.SerialPort.InfiniteTimeout
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else:
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self._port_handle.WriteTimeout = int(self._writeTimeout*1000)
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# Setup the connection info.
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try:
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self._port_handle.BaudRate = self._baudrate
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except IOError, e:
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# catch errors from illegal baudrate settings
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raise ValueError(str(e))
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if self._bytesize == FIVEBITS:
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self._port_handle.DataBits = 5
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elif self._bytesize == SIXBITS:
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self._port_handle.DataBits = 6
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elif self._bytesize == SEVENBITS:
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self._port_handle.DataBits = 7
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elif self._bytesize == EIGHTBITS:
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self._port_handle.DataBits = 8
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else:
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raise ValueError("Unsupported number of data bits: %r" % self._bytesize)
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if self._parity == PARITY_NONE:
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self._port_handle.Parity = getattr(System.IO.Ports.Parity, 'None') # reserved keyword in Py3k
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elif self._parity == PARITY_EVEN:
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self._port_handle.Parity = System.IO.Ports.Parity.Even
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elif self._parity == PARITY_ODD:
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self._port_handle.Parity = System.IO.Ports.Parity.Odd
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elif self._parity == PARITY_MARK:
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self._port_handle.Parity = System.IO.Ports.Parity.Mark
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elif self._parity == PARITY_SPACE:
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self._port_handle.Parity = System.IO.Ports.Parity.Space
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else:
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raise ValueError("Unsupported parity mode: %r" % self._parity)
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if self._stopbits == STOPBITS_ONE:
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self._port_handle.StopBits = System.IO.Ports.StopBits.One
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elif self._stopbits == STOPBITS_ONE_POINT_FIVE:
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self._port_handle.StopBits = System.IO.Ports.StopBits.OnePointFive
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elif self._stopbits == STOPBITS_TWO:
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self._port_handle.StopBits = System.IO.Ports.StopBits.Two
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else:
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raise ValueError("Unsupported number of stop bits: %r" % self._stopbits)
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if self._rtscts and self._xonxoff:
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self._port_handle.Handshake = System.IO.Ports.Handshake.RequestToSendXOnXOff
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elif self._rtscts:
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self._port_handle.Handshake = System.IO.Ports.Handshake.RequestToSend
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elif self._xonxoff:
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self._port_handle.Handshake = System.IO.Ports.Handshake.XOnXOff
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else:
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self._port_handle.Handshake = getattr(System.IO.Ports.Handshake, 'None') # reserved keyword in Py3k
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#~ def __del__(self):
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#~ self.close()
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def close(self):
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"""Close port"""
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if self._isOpen:
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if self._port_handle:
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try:
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self._port_handle.Close()
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except System.IO.Ports.InvalidOperationException:
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# ignore errors. can happen for unplugged USB serial devices
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pass
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self._port_handle = None
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self._isOpen = False
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def makeDeviceName(self, port):
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try:
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return device(port)
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except TypeError, e:
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raise SerialException(str(e))
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# - - - - - - - - - - - - - - - - - - - - - - - -
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def inWaiting(self):
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"""Return the number of characters currently in the input buffer."""
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if not self._port_handle: raise portNotOpenError
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return self._port_handle.BytesToRead
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def read(self, size=1):
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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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if not self._port_handle: raise portNotOpenError
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# must use single byte reads as this is the only way to read
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# without applying encodings
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data = bytearray()
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while size:
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try:
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data.append(self._port_handle.ReadByte())
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except System.TimeoutException, e:
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break
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else:
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size -= 1
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return bytes(data)
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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._port_handle: 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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try:
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# must call overloaded method with byte array argument
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# as this is the only one not applying encodings
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self._port_handle.Write(as_byte_array(data), 0, len(data))
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except System.TimeoutException, e:
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raise writeTimeoutError
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return len(data)
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def flushInput(self):
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"""Clear input buffer, discarding all that is in the buffer."""
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if not self._port_handle: raise portNotOpenError
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self._port_handle.DiscardInBuffer()
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def flushOutput(self):
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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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if not self._port_handle: raise portNotOpenError
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self._port_handle.DiscardOutBuffer()
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def sendBreak(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._port_handle: raise portNotOpenError
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import time
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self._port_handle.BreakState = True
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time.sleep(duration)
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self._port_handle.BreakState = False
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def setBreak(self, level=True):
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"""Set break: Controls TXD. When active, to transmitting is possible."""
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if not self._port_handle: raise portNotOpenError
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self._port_handle.BreakState = bool(level)
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def setRTS(self, level=True):
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"""Set terminal status line: Request To Send"""
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if not self._port_handle: raise portNotOpenError
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self._port_handle.RtsEnable = bool(level)
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def setDTR(self, level=True):
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"""Set terminal status line: Data Terminal Ready"""
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if not self._port_handle: raise portNotOpenError
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self._port_handle.DtrEnable = bool(level)
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def getCTS(self):
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"""Read terminal status line: Clear To Send"""
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if not self._port_handle: raise portNotOpenError
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return self._port_handle.CtsHolding
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def getDSR(self):
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"""Read terminal status line: Data Set Ready"""
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if not self._port_handle: raise portNotOpenError
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return self._port_handle.DsrHolding
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def getRI(self):
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"""Read terminal status line: Ring Indicator"""
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if not self._port_handle: raise portNotOpenError
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#~ return self._port_handle.XXX
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return False #XXX an error would be better
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def getCD(self):
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"""Read terminal status line: Carrier Detect"""
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if not self._port_handle: raise portNotOpenError
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return self._port_handle.CDHolding
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# - - platform specific - - - -
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# none
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# assemble Serial class with the platform specific implementation and the base
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# for file-like behavior. for Python 2.6 and newer, that provide the new I/O
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# library, derive from io.RawIOBase
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try:
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import io
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except ImportError:
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# classic version with our own file-like emulation
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class Serial(IronSerial, FileLike):
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pass
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else:
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# io library present
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class Serial(IronSerial, io.RawIOBase):
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pass
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# Nur Testfunktion!!
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if __name__ == '__main__':
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import sys
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s = Serial(0)
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sys.stdio.write('%s\n' % s)
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s = Serial()
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sys.stdio.write('%s\n' % s)
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s.baudrate = 19200
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s.databits = 7
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s.close()
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s.port = 0
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s.open()
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sys.stdio.write('%s\n' % s)
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