#! python
# Python Serial Port Extension for Win32, Linux, BSD, Jython and .NET/Mono
# serial driver for .NET/Mono (IronPython), .NET >= 2
# see __init__.py
#
# (C) 2008 Chris Liechti <cliechti@gmx.net>
# this is distributed under a free software license, see license.txt
import clr
import System
import System.IO.Ports
from serialutil import *
def device(portnum):
"""Turn a port number into a device name"""
return System.IO.Ports.SerialPort.GetPortNames()[portnum]
# 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 IronSerial(SerialBase):
"""Serial port implemenation 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.")
try:
self._port_handle = System.IO.Ports.SerialPort(self.portstr)
except Exception, msg:
self._port_handle = None
raise SerialException("could not open port %s: %s" % (self.portstr, msg))
self._reconfigurePort()
self._port_handle.Open()
self._isOpen = True
if not self._rtscts:
self.setRTS(True)
self.setDTR(True)
self.flushInput()
self.flushOutput()
def _reconfigurePort(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._writeTimeout is None:
self._port_handle.WriteTimeout = System.IO.Ports.SerialPort.InfiniteTimeout
else:
self._port_handle.WriteTimeout = int(self._writeTimeout*1000)
# Setup the connection info.
try:
self._port_handle.BaudRate = self._baudrate
except IOError, 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._isOpen:
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._isOpen = False
def makeDeviceName(self, port):
try:
return device(port)
except TypeError, e:
raise SerialException(str(e))
# - - - - - - - - - - - - - - - - - - - - - - - -
def inWaiting(self):
"""Return the number of characters currently in the input buffer."""
if not self._port_handle: 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._port_handle: 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, e:
break
else:
size -= 1
return bytes(data)
def write(self, data):
"""Output the given string over the serial port."""
if not self._port_handle: 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, e:
raise writeTimeoutError
return len(data)
def flushInput(self):
"""Clear input buffer, discarding all that is in the buffer."""
if not self._port_handle: raise portNotOpenError
self._port_handle.DiscardInBuffer()
def flushOutput(self):
"""Clear output buffer, aborting the current output and
discarding all that is in the buffer."""
if not self._port_handle: raise portNotOpenError
self._port_handle.DiscardOutBuffer()
def sendBreak(self, duration=0.25):
"""Send break condition. Timed, returns to idle state after given duration."""
if not self._port_handle: raise portNotOpenError
import time
self._port_handle.BreakState = True
time.sleep(duration)
self._port_handle.BreakState = False
def setBreak(self, level=True):
"""Set break: Controls TXD. When active, to transmitting is possible."""
if not self._port_handle: raise portNotOpenError
self._port_handle.BreakState = bool(level)
def setRTS(self, level=True):
"""Set terminal status line: Request To Send"""
if not self._port_handle: raise portNotOpenError
self._port_handle.RtsEnable = bool(level)
def setDTR(self, level=True):
"""Set terminal status line: Data Terminal Ready"""
if not self._port_handle: raise portNotOpenError
self._port_handle.DtrEnable = bool(level)
def getCTS(self):
"""Read terminal status line: Clear To Send"""
if not self._port_handle: raise portNotOpenError
return self._port_handle.CtsHolding
def getDSR(self):
"""Read terminal status line: Data Set Ready"""
if not self._port_handle: raise portNotOpenError
return self._port_handle.DsrHolding
def getRI(self):
"""Read terminal status line: Ring Indicator"""
if not self._port_handle: raise portNotOpenError
#~ return self._port_handle.XXX
return False #XXX an error would be better
def getCD(self):
"""Read terminal status line: Carrier Detect"""
if not self._port_handle: raise portNotOpenError
return self._port_handle.CDHolding
# - - platform specific - - - -
# none
# assemble Serial class with the platform specific implementation and the base
# for file-like behavior. for Python 2.6 and newer, that provide the new I/O
# library, derive from io.RawIOBase
try:
import io
except ImportError:
# classic version with our own file-like emulation
class Serial(IronSerial, FileLike):
pass
else:
# io library present
class Serial(IronSerial, io.RawIOBase):
pass
# Nur Testfunktion!!
if __name__ == '__main__':
import sys
s = Serial(0)
sys.stdio.write('%s\n' % s)
s = Serial()
sys.stdio.write('%s\n' % s)
s.baudrate = 19200
s.databits = 7
s.close()
s.port = 0
s.open()
sys.stdio.write('%s\n' % s)
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