281 lines
11 KiB
Python
281 lines
11 KiB
Python
#! python
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#serial driver for win32
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#see __init__.py
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#
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#(C) 2001-2002 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 win32file # The base COM port and file IO functions.
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import win32event # We use events and the WaitFor[Single|Multiple]Objects functions.
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import win32con # constants.
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import sys, string
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import serialutil
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VERSION = string.split("$Revision: 1.1 $")[1] #extract CVS version
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PARITY_NONE, PARITY_EVEN, PARITY_ODD = range(3)
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STOPBITS_ONE, STOPBITS_TWO = (1, 2)
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FIVEBITS, SIXBITS, SEVENBITS, EIGHTBITS = (5,6,7,8)
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portNotOpenError = ValueError('port not open')
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#from winbase.h. these should realy be in win32con
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MS_CTS_ON = 16
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MS_DSR_ON = 32
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MS_RING_ON = 64
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MS_RLSD_ON = 128
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class Serial(serialutil.FileLike):
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def __init__(self,
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port, #number of device, numbering starts at
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#zero. if everything fails, the user
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#can specify a device string, note
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#that this isn't portable anymore
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baudrate=9600, #baudrate
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bytesize=EIGHTBITS, #number of databits
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parity=PARITY_NONE, #enable parity checking
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stopbits=STOPBITS_ONE, #number of stopbits
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timeout=None, #set a timeout value, None for waiting forever
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xonxoff=0, #enable software flow control
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rtscts=0, #enable RTS/CTS flow control
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):
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"""initialize comm port"""
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self.timeout = timeout
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if type(port) == type(''): #strings are taken directly
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self.portstr = port
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else:
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# CSS 20040528 - open wasn't working for COM10 and greater, but by
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# chance the '\\.\COM10' format seems to work, yay! But, only use
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# if for COM10 and greater in case it introduces some other
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# incompatibility.
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if port < 9:
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self.portstr = 'COM%d' % (port+1) #numbers are transformed to a string
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else:
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self.portstr = '\\\\.\\COM%d' % (port+1) #WIN NT format??
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try:
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self.hComPort = win32file.CreateFile(self.portstr,
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win32con.GENERIC_READ | win32con.GENERIC_WRITE,
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0, # exclusive access
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None, # no security
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win32con.OPEN_EXISTING,
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win32con.FILE_ATTRIBUTE_NORMAL | win32con.FILE_FLAG_OVERLAPPED,
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None)
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except Exception, msg:
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self.hComPort = None #'cause __del__ is called anyway
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raise serialutil.SerialException, "could not open port: %s" % msg
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# Setup a 4k buffer
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win32file.SetupComm(self.hComPort, 4096, 4096)
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#Save original timeout values:
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self.orgTimeouts = win32file.GetCommTimeouts(self.hComPort)
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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 timeout is None:
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timeouts = (0, 0, 0, 0, 0)
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elif timeout == 0:
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timeouts = (win32con.MAXDWORD, 0, 0, 0, 0)
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else:
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#timeouts = (0, 0, 0, 0, 0) #timeouts are done with WaitForSingleObject
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#timeouts = (win32con.MAXDWORD, 0, 0, 0, 1000) #doesn't works
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#timeouts = (timeout*1000, 0, timeout*1000, 0, 0)
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timeouts = (0, 0, timeout*1000, 0, timeout*1000)
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win32file.SetCommTimeouts(self.hComPort, timeouts)
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#win32file.SetCommMask(self.hComPort, win32file.EV_RXCHAR | win32file.EV_TXEMPTY |
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# win32file.EV_RXFLAG | win32file.EV_ERR)
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win32file.SetCommMask(self.hComPort,
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win32file.EV_RXCHAR | win32file.EV_RXFLAG | win32file.EV_ERR)
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#win32file.SetCommMask(self.hComPort, win32file.EV_ERR)
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# Setup the connection info.
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# Get state and modify it:
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comDCB = win32file.GetCommState(self.hComPort)
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comDCB.BaudRate = baudrate
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if bytesize == FIVEBITS:
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comDCB.ByteSize = 5
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elif bytesize == SIXBITS:
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comDCB.ByteSize = 6
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elif bytesize == SEVENBITS:
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comDCB.ByteSize = 7
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elif bytesize == EIGHTBITS:
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comDCB.ByteSize = 8
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if parity == PARITY_NONE:
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comDCB.Parity = win32file.NOPARITY
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comDCB.fParity = 0 # Dis/Enable Parity Check
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elif parity == PARITY_EVEN:
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comDCB.Parity = win32file.EVENPARITY
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comDCB.fParity = 1 # Dis/Enable Parity Check
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elif parity == PARITY_ODD:
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comDCB.Parity = win32file.ODDPARITY
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comDCB.fParity = 1 # Dis/Enable Parity Check
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if stopbits == STOPBITS_ONE:
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comDCB.StopBits = win32file.ONESTOPBIT
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elif stopbits == STOPBITS_TWO:
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comDCB.StopBits = win32file.TWOSTOPBITS
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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 rtscts:
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comDCB.fRtsControl = win32file.RTS_CONTROL_HANDSHAKE
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comDCB.fDtrControl = win32file.DTR_CONTROL_HANDSHAKE
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else:
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comDCB.fRtsControl = win32file.RTS_CONTROL_ENABLE
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comDCB.fDtrControl = win32file.DTR_CONTROL_ENABLE
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comDCB.fOutxCtsFlow = rtscts
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comDCB.fOutxDsrFlow = rtscts
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comDCB.fOutX = xonxoff
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comDCB.fInX = 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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win32file.SetCommState(self.hComPort, comDCB)
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# Clear buffers:
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# Remove anything that was there
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win32file.PurgeComm(self.hComPort,
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win32file.PURGE_TXCLEAR | win32file.PURGE_TXABORT |
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win32file.PURGE_RXCLEAR | win32file.PURGE_RXABORT)
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#print win32file.ClearCommError(self.hComPort) #flags, comState =
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#self.overlapped = win32file.OVERLAPPED()
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#self.overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
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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.hComPort:
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#Wait until data is transmitted, but not too long... (Timeout-Time)
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#while 1:
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# flags, comState = win32file.ClearCommError(hComPort)
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# if comState.cbOutQue <= 0 or calcTimeout(startTime) > timeout:
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# break
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self.setRTS(0)
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self.setDTR(0)
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#Clear buffers:
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win32file.PurgeComm(self.hComPort,
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win32file.PURGE_TXCLEAR | win32file.PURGE_TXABORT |
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win32file.PURGE_RXCLEAR | win32file.PURGE_RXABORT)
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#Restore original timeout values:
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win32file.SetCommTimeouts(self.hComPort, self.orgTimeouts)
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#Close COM-Port:
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win32file.CloseHandle(self.hComPort)
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self.hComPort = None
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def setBaudrate(self, baudrate):
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"""change baudrate after port is open"""
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if not self.hComPort: raise portNotOpenError
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# Setup the connection info.
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# Get state and modify it:
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comDCB = win32file.GetCommState(self.hComPort)
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comDCB.BaudRate = baudrate
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win32file.SetCommState(self.hComPort, comDCB)
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def inWaiting(self):
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"""returns the number of bytes waiting to be read"""
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flags, comstat = win32file.ClearCommError(self.hComPort)
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return comstat.cbInQue
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def read(self, size=1):
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"read num bytes from serial port"
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if not self.hComPort: raise portNotOpenError
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read = ''
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if size > 0:
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overlapped = win32file.OVERLAPPED()
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overlapped.hEvent = win32event.CreateEvent(None, 1, 0, None)
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if self.timeout == 0:
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flags, comstat = win32file.ClearCommError(self.hComPort)
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n = min(comstat.cbInQue, size)
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if n > 0:
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rc, buf = win32file.ReadFile(self.hComPort, win32file.AllocateReadBuffer(n), overlapped)
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win32event.WaitForSingleObject(overlapped.hEvent, win32event.INFINITE)
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read = str(buf)
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else:
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flags, comstat = win32file.ClearCommError(self.hComPort)
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rc, buf = win32file.ReadFile(self.hComPort, win32file.AllocateReadBuffer(size), overlapped)
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n = win32file.GetOverlappedResult(self.hComPort, overlapped, 1)
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read = str(buf[:n])
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return read
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def write(self, s):
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"write string to serial port"
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if not self.hComPort: raise portNotOpenError
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#print repr(s),
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overlapped = win32file.OVERLAPPED()
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overlapped.hEvent = win32event.CreateEvent(None, 1, 0, None)
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err, n = win32file.WriteFile(self.hComPort, s, overlapped)
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if err: #will be ERROR_IO_PENDING:
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# Wait for the write to complete.
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win32event.WaitForSingleObject(overlapped.hEvent, win32event.INFINITE)
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def flushInput(self):
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if not self.hComPort: raise portNotOpenError
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win32file.PurgeComm(self.hComPort, win32file.PURGE_RXCLEAR | win32file.PURGE_RXABORT)
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def flushOutput(self):
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if not self.hComPort: raise portNotOpenError
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win32file.PurgeComm(self.hComPort, win32file.PURGE_TXCLEAR | win32file.PURGE_TXABORT)
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def sendBreak(self):
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if not self.hComPort: raise portNotOpenError
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import time
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win32file.SetCommBreak(self.hComPort)
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#TODO: how to set the correct duration??
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time.sleep(0.020)
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win32file.ClearCommBreak(self.hComPort)
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def setRTS(self,level=1):
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"""set terminal status line"""
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if not self.hComPort: raise portNotOpenError
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if level:
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win32file.EscapeCommFunction(self.hComPort, win32file.SETRTS)
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else:
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win32file.EscapeCommFunction(self.hComPort, win32file.CLRRTS)
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def setDTR(self,level=1):
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"""set terminal status line"""
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if not self.hComPort: raise portNotOpenError
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if level:
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win32file.EscapeCommFunction(self.hComPort, win32file.SETDTR)
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else:
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win32file.EscapeCommFunction(self.hComPort, win32file.CLRDTR)
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def getCTS(self):
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"""read terminal status line"""
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if not self.hComPort: raise portNotOpenError
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return MS_CTS_ON & win32file.GetCommModemStatus(self.hComPort) != 0
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def getDSR(self):
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"""read terminal status line"""
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if not self.hComPort: raise portNotOpenError
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return MS_DSR_ON & win32file.GetCommModemStatus(self.hComPort) != 0
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def getRI(self):
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"""read terminal status line"""
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if not self.hComPort: raise portNotOpenError
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return MS_RING_ON & win32file.GetCommModemStatus(self.hComPort) != 0
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def getCD(self):
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"""read terminal status line"""
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if not self.hComPort: raise portNotOpenError
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return MS_RLSD_ON & win32file.GetCommModemStatus(self.hComPort) != 0
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#Nur Testfunktion!!
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if __name__ == '__main__':
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print __name__
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s = Serial(0)
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