462 lines
18 KiB
Python
462 lines
18 KiB
Python
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#! python
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# Python Serial Port Extension for Win32, Linux, BSD, Jython
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# serial driver for win32
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# see __init__.py
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#
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# (C) 2001-2011 Chris Liechti <cliechti@gmx.net>
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# this is distributed under a free software license, see license.txt
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#
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# Initial patch to use ctypes by Giovanni Bajo <rasky@develer.com>
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import ctypes
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from serial import win32
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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 'COM%d' % (portnum+1) # numbers are transformed to a string
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class Win32Serial(SerialBase):
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"""Serial port implementation for Win32 based on ctypes."""
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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 __init__(self, *args, **kwargs):
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self.hComPort = None
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self._overlappedRead = None
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self._overlappedWrite = None
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self._rtsToggle = False
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self._rtsState = win32.RTS_CONTROL_ENABLE
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self._dtrState = win32.DTR_CONTROL_ENABLE
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SerialBase.__init__(self, *args, **kwargs)
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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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# the "\\.\COMx" format is required for devices other than COM1-COM8
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# not all versions of windows seem to support this properly
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# so that the first few ports are used with the DOS device name
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port = self.portstr
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try:
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if port.upper().startswith('COM') and int(port[3:]) > 8:
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port = '\\\\.\\' + port
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except ValueError:
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# for like COMnotanumber
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pass
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self.hComPort = win32.CreateFile(port,
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win32.GENERIC_READ | win32.GENERIC_WRITE,
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0, # exclusive access
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None, # no security
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win32.OPEN_EXISTING,
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win32.FILE_ATTRIBUTE_NORMAL | win32.FILE_FLAG_OVERLAPPED,
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0)
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if self.hComPort == win32.INVALID_HANDLE_VALUE:
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self.hComPort = None # 'cause __del__ is called anyway
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raise SerialException("could not open port %r: %r" % (self.portstr, ctypes.WinError()))
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try:
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self._overlappedRead = win32.OVERLAPPED()
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self._overlappedRead.hEvent = win32.CreateEvent(None, 1, 0, None)
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self._overlappedWrite = win32.OVERLAPPED()
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#~ self._overlappedWrite.hEvent = win32.CreateEvent(None, 1, 0, None)
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self._overlappedWrite.hEvent = win32.CreateEvent(None, 0, 0, None)
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# Setup a 4k buffer
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win32.SetupComm(self.hComPort, 4096, 4096)
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# Save original timeout values:
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self._orgTimeouts = win32.COMMTIMEOUTS()
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win32.GetCommTimeouts(self.hComPort, ctypes.byref(self._orgTimeouts))
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self._reconfigurePort()
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# Clear buffers:
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# Remove anything that was there
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win32.PurgeComm(self.hComPort,
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win32.PURGE_TXCLEAR | win32.PURGE_TXABORT |
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win32.PURGE_RXCLEAR | win32.PURGE_RXABORT)
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except:
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try:
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self._close()
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except:
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# ignore any exception when closing the port
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# also to keep original exception that happened when setting up
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pass
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self.hComPort = None
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raise
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else:
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self._isOpen = 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.hComPort:
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raise SerialException("Can only operate on a valid port handle")
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# Set Windows timeout values
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# timeouts is a tuple with the following items:
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# (ReadIntervalTimeout,ReadTotalTimeoutMultiplier,
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# ReadTotalTimeoutConstant,WriteTotalTimeoutMultiplier,
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# WriteTotalTimeoutConstant)
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if self._timeout is None:
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timeouts = (0, 0, 0, 0, 0)
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elif self._timeout == 0:
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timeouts = (win32.MAXDWORD, 0, 0, 0, 0)
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else:
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timeouts = (0, 0, int(self._timeout*1000), 0, 0)
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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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pass
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elif self._writeTimeout == 0:
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timeouts = timeouts[:-2] + (0, win32.MAXDWORD)
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else:
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timeouts = timeouts[:-2] + (0, int(self._writeTimeout*1000))
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win32.SetCommTimeouts(self.hComPort, ctypes.byref(win32.COMMTIMEOUTS(*timeouts)))
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win32.SetCommMask(self.hComPort, win32.EV_ERR)
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# Setup the connection info.
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# Get state and modify it:
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comDCB = win32.DCB()
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win32.GetCommState(self.hComPort, ctypes.byref(comDCB))
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comDCB.BaudRate = self._baudrate
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if self._bytesize == FIVEBITS:
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comDCB.ByteSize = 5
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elif self._bytesize == SIXBITS:
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comDCB.ByteSize = 6
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elif self._bytesize == SEVENBITS:
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comDCB.ByteSize = 7
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elif self._bytesize == EIGHTBITS:
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comDCB.ByteSize = 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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comDCB.Parity = win32.NOPARITY
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comDCB.fParity = 0 # Disable Parity Check
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elif self._parity == PARITY_EVEN:
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comDCB.Parity = win32.EVENPARITY
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comDCB.fParity = 1 # Enable Parity Check
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elif self._parity == PARITY_ODD:
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comDCB.Parity = win32.ODDPARITY
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comDCB.fParity = 1 # Enable Parity Check
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elif self._parity == PARITY_MARK:
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comDCB.Parity = win32.MARKPARITY
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comDCB.fParity = 1 # Enable Parity Check
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elif self._parity == PARITY_SPACE:
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comDCB.Parity = win32.SPACEPARITY
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comDCB.fParity = 1 # Enable Parity Check
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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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comDCB.StopBits = win32.ONESTOPBIT
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elif self._stopbits == STOPBITS_ONE_POINT_FIVE:
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comDCB.StopBits = win32.ONE5STOPBITS
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elif self._stopbits == STOPBITS_TWO:
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comDCB.StopBits = win32.TWOSTOPBITS
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else:
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raise ValueError("Unsupported number of stop bits: %r" % self._stopbits)
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comDCB.fBinary = 1 # Enable Binary Transmission
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# Char. w/ Parity-Err are replaced with 0xff (if fErrorChar is set to TRUE)
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if self._rtscts:
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comDCB.fRtsControl = win32.RTS_CONTROL_HANDSHAKE
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elif self._rtsToggle:
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comDCB.fRtsControl = win32.RTS_CONTROL_TOGGLE
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else:
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comDCB.fRtsControl = self._rtsState
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if self._dsrdtr:
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comDCB.fDtrControl = win32.DTR_CONTROL_HANDSHAKE
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else:
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comDCB.fDtrControl = self._dtrState
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if self._rtsToggle:
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comDCB.fOutxCtsFlow = 0
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else:
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comDCB.fOutxCtsFlow = self._rtscts
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comDCB.fOutxDsrFlow = self._dsrdtr
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comDCB.fOutX = self._xonxoff
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comDCB.fInX = self._xonxoff
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comDCB.fNull = 0
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comDCB.fErrorChar = 0
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comDCB.fAbortOnError = 0
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comDCB.XonChar = XON
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comDCB.XoffChar = XOFF
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if not win32.SetCommState(self.hComPort, ctypes.byref(comDCB)):
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raise ValueError("Cannot configure port, some setting was wrong. Original message: %r" % ctypes.WinError())
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#~ def __del__(self):
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#~ self.close()
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def _close(self):
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"""internal close port helper"""
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if self.hComPort:
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# Restore original timeout values:
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win32.SetCommTimeouts(self.hComPort, self._orgTimeouts)
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# Close COM-Port:
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win32.CloseHandle(self.hComPort)
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if self._overlappedRead is not None:
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win32.CloseHandle(self._overlappedRead.hEvent)
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self._overlappedRead = None
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if self._overlappedWrite is not None:
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win32.CloseHandle(self._overlappedWrite.hEvent)
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self._overlappedWrite = None
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self.hComPort = None
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def close(self):
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"""Close port"""
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if self._isOpen:
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self._close()
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self._isOpen = False
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def makeDeviceName(self, port):
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return device(port)
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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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flags = win32.DWORD()
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comstat = win32.COMSTAT()
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if not win32.ClearCommError(self.hComPort, ctypes.byref(flags), ctypes.byref(comstat)):
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raise SerialException('call to ClearCommError failed')
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return comstat.cbInQue
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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.hComPort: raise portNotOpenError
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if size > 0:
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win32.ResetEvent(self._overlappedRead.hEvent)
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flags = win32.DWORD()
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comstat = win32.COMSTAT()
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if not win32.ClearCommError(self.hComPort, ctypes.byref(flags), ctypes.byref(comstat)):
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raise SerialException('call to ClearCommError failed')
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if self.timeout == 0:
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n = min(comstat.cbInQue, size)
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if n > 0:
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buf = ctypes.create_string_buffer(n)
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rc = win32.DWORD()
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err = win32.ReadFile(self.hComPort, buf, n, ctypes.byref(rc), ctypes.byref(self._overlappedRead))
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if not err and win32.GetLastError() != win32.ERROR_IO_PENDING:
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raise SerialException("ReadFile failed (%r)" % ctypes.WinError())
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err = win32.WaitForSingleObject(self._overlappedRead.hEvent, win32.INFINITE)
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read = buf.raw[:rc.value]
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else:
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read = bytes()
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else:
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buf = ctypes.create_string_buffer(size)
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rc = win32.DWORD()
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err = win32.ReadFile(self.hComPort, buf, size, ctypes.byref(rc), ctypes.byref(self._overlappedRead))
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if not err and win32.GetLastError() != win32.ERROR_IO_PENDING:
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raise SerialException("ReadFile failed (%r)" % ctypes.WinError())
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err = win32.GetOverlappedResult(self.hComPort, ctypes.byref(self._overlappedRead), ctypes.byref(rc), True)
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read = buf.raw[:rc.value]
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else:
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read = bytes()
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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.hComPort: 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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# convert data (needed in case of memoryview instance: Py 3.1 io lib), ctypes doesn't like memoryview
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data = to_bytes(data)
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if data:
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#~ win32event.ResetEvent(self._overlappedWrite.hEvent)
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n = win32.DWORD()
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err = win32.WriteFile(self.hComPort, data, len(data), ctypes.byref(n), self._overlappedWrite)
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if not err and win32.GetLastError() != win32.ERROR_IO_PENDING:
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raise SerialException("WriteFile failed (%r)" % ctypes.WinError())
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if self._writeTimeout != 0: # if blocking (None) or w/ write timeout (>0)
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# Wait for the write to complete.
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#~ win32.WaitForSingleObject(self._overlappedWrite.hEvent, win32.INFINITE)
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err = win32.GetOverlappedResult(self.hComPort, self._overlappedWrite, ctypes.byref(n), True)
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if n.value != len(data):
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raise writeTimeoutError
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return n.value
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else:
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return 0
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def flush(self):
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"""Flush of file like objects. In this case, wait until all data
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is written."""
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while self.outWaiting():
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time.sleep(0.05)
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# XXX could also use WaitCommEvent with mask EV_TXEMPTY, but it would
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# require overlapped IO and its also only possible to set a single mask
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# on the port---
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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.hComPort: raise portNotOpenError
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win32.PurgeComm(self.hComPort, win32.PURGE_RXCLEAR | win32.PURGE_RXABORT)
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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.hComPort: raise portNotOpenError
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win32.PurgeComm(self.hComPort, win32.PURGE_TXCLEAR | win32.PURGE_TXABORT)
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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.hComPort: raise portNotOpenError
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import time
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win32.SetCommBreak(self.hComPort)
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time.sleep(duration)
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win32.ClearCommBreak(self.hComPort)
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def setBreak(self, level=1):
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"""Set break: Controls TXD. When active, to transmitting is possible."""
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if not self.hComPort: raise portNotOpenError
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if level:
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win32.SetCommBreak(self.hComPort)
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else:
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win32.ClearCommBreak(self.hComPort)
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def setRTS(self, level=1):
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"""Set terminal status line: Request To Send"""
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# remember level for reconfigure
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if level:
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self._rtsState = win32.RTS_CONTROL_ENABLE
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else:
|
||
|
|
self._rtsState = win32.RTS_CONTROL_DISABLE
|
||
|
|
# also apply now if port is open
|
||
|
|
if self.hComPort:
|
||
|
|
if level:
|
||
|
|
win32.EscapeCommFunction(self.hComPort, win32.SETRTS)
|
||
|
|
else:
|
||
|
|
win32.EscapeCommFunction(self.hComPort, win32.CLRRTS)
|
||
|
|
|
||
|
|
def setDTR(self, level=1):
|
||
|
|
"""Set terminal status line: Data Terminal Ready"""
|
||
|
|
# remember level for reconfigure
|
||
|
|
if level:
|
||
|
|
self._dtrState = win32.DTR_CONTROL_ENABLE
|
||
|
|
else:
|
||
|
|
self._dtrState = win32.DTR_CONTROL_DISABLE
|
||
|
|
# also apply now if port is open
|
||
|
|
if self.hComPort:
|
||
|
|
if level:
|
||
|
|
win32.EscapeCommFunction(self.hComPort, win32.SETDTR)
|
||
|
|
else:
|
||
|
|
win32.EscapeCommFunction(self.hComPort, win32.CLRDTR)
|
||
|
|
|
||
|
|
def _GetCommModemStatus(self):
|
||
|
|
stat = win32.DWORD()
|
||
|
|
win32.GetCommModemStatus(self.hComPort, ctypes.byref(stat))
|
||
|
|
return stat.value
|
||
|
|
|
||
|
|
def getCTS(self):
|
||
|
|
"""Read terminal status line: Clear To Send"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
return win32.MS_CTS_ON & self._GetCommModemStatus() != 0
|
||
|
|
|
||
|
|
def getDSR(self):
|
||
|
|
"""Read terminal status line: Data Set Ready"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
return win32.MS_DSR_ON & self._GetCommModemStatus() != 0
|
||
|
|
|
||
|
|
def getRI(self):
|
||
|
|
"""Read terminal status line: Ring Indicator"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
return win32.MS_RING_ON & self._GetCommModemStatus() != 0
|
||
|
|
|
||
|
|
def getCD(self):
|
||
|
|
"""Read terminal status line: Carrier Detect"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
return win32.MS_RLSD_ON & self._GetCommModemStatus() != 0
|
||
|
|
|
||
|
|
# - - platform specific - - - -
|
||
|
|
|
||
|
|
def setBufferSize(self, rx_size=4096, tx_size=None):
|
||
|
|
"""\
|
||
|
|
Recommend a buffer size to the driver (device driver can ignore this
|
||
|
|
vlaue). Must be called before the port is opended.
|
||
|
|
"""
|
||
|
|
if tx_size is None: tx_size = rx_size
|
||
|
|
win32.SetupComm(self.hComPort, rx_size, tx_size)
|
||
|
|
|
||
|
|
def setXON(self, level=True):
|
||
|
|
"""\
|
||
|
|
Manually control flow - when software flow control is enabled.
|
||
|
|
This will send XON (true) and XOFF (false) to the other device.
|
||
|
|
WARNING: this function is not portable to different platforms!
|
||
|
|
"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
if level:
|
||
|
|
win32.EscapeCommFunction(self.hComPort, win32.SETXON)
|
||
|
|
else:
|
||
|
|
win32.EscapeCommFunction(self.hComPort, win32.SETXOFF)
|
||
|
|
|
||
|
|
def outWaiting(self):
|
||
|
|
"""return how many characters the in the outgoing buffer"""
|
||
|
|
flags = win32.DWORD()
|
||
|
|
comstat = win32.COMSTAT()
|
||
|
|
if not win32.ClearCommError(self.hComPort, ctypes.byref(flags), ctypes.byref(comstat)):
|
||
|
|
raise SerialException('call to ClearCommError failed')
|
||
|
|
return comstat.cbOutQue
|
||
|
|
|
||
|
|
# functions useful for RS-485 adapters
|
||
|
|
def setRtsToggle(self, rtsToggle):
|
||
|
|
"""Change RTS toggle control setting."""
|
||
|
|
self._rtsToggle = rtsToggle
|
||
|
|
if self._isOpen: self._reconfigurePort()
|
||
|
|
|
||
|
|
def getRtsToggle(self):
|
||
|
|
"""Get the current RTS toggle control setting."""
|
||
|
|
return self._rtsToggle
|
||
|
|
|
||
|
|
rtsToggle = property(getRtsToggle, setRtsToggle, doc="RTS toggle control setting")
|
||
|
|
|
||
|
|
|
||
|
|
# 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(Win32Serial, FileLike):
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
# io library present
|
||
|
|
class Serial(Win32Serial, io.RawIOBase):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
# Nur Testfunktion!!
|
||
|
|
if __name__ == '__main__':
|
||
|
|
s = Serial(0)
|
||
|
|
sys.stdout.write("%s\n" % s)
|
||
|
|
|
||
|
|
s = Serial()
|
||
|
|
sys.stdout.write("%s\n" % s)
|
||
|
|
|
||
|
|
s.baudrate = 19200
|
||
|
|
s.databits = 7
|
||
|
|
s.close()
|
||
|
|
s.port = 0
|
||
|
|
s.open()
|
||
|
|
sys.stdout.write("%s\n" % s)
|
||
|
|
|