mirror of
git://projects.qi-hardware.com/openwrt-packages.git
synced 2024-11-27 10:32:48 +02:00
337 lines
13 KiB
Python
337 lines
13 KiB
Python
|
#! python
|
||
|
|
# Python Serial Port Extension for Win32, Linux, BSD, Jython
|
||
|
|
# serial driver for win32
|
||
|
|
# see __init__.py
|
||
|
|
#
|
||
|
|
# (C) 2001-2008 Chris Liechti <cliechti@gmx.net>
|
||
|
|
# this is distributed under a free software license, see license.txt
|
||
|
|
|
||
|
|
import win32file # The base COM port and file IO functions.
|
||
|
|
import win32event # We use events and the WaitFor[Single|Multiple]Objects functions.
|
||
|
|
import win32con # constants.
|
||
|
|
from serialutil import *
|
||
|
|
|
||
|
|
#from winbase.h. these should realy be in win32con
|
||
|
|
MS_CTS_ON = 16
|
||
|
|
MS_DSR_ON = 32
|
||
|
|
MS_RING_ON = 64
|
||
|
|
MS_RLSD_ON = 128
|
||
|
|
|
||
|
|
def device(portnum):
|
||
|
|
"""Turn a port number into a device name"""
|
||
|
|
return 'COM%d' % (portnum+1) #numbers are transformed to a string
|
||
|
|
|
||
|
|
class Serial(SerialBase):
|
||
|
|
"""Serial port implemenation for Win32. This implemenatation requires a
|
||
|
|
win32all installation."""
|
||
|
|
|
||
|
|
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.")
|
||
|
|
self.hComPort = None
|
||
|
|
# the "\\.\COMx" format is required for devices other than COM1-COM8
|
||
|
|
# not all versions of windows seem to support this properly
|
||
|
|
# so that the first few ports are used with the DOS device name
|
||
|
|
port = self.portstr
|
||
|
|
if port.upper().startswith('COM') and int(port[3:]) > 8:
|
||
|
|
port = '\\\\.\\' + port
|
||
|
|
try:
|
||
|
|
self.hComPort = win32file.CreateFile(port,
|
||
|
|
win32con.GENERIC_READ | win32con.GENERIC_WRITE,
|
||
|
|
0, # exclusive access
|
||
|
|
None, # no security
|
||
|
|
win32con.OPEN_EXISTING,
|
||
|
|
win32con.FILE_FLAG_OVERLAPPED,
|
||
|
|
None)
|
||
|
|
except Exception, msg:
|
||
|
|
self.hComPort = None #'cause __del__ is called anyway
|
||
|
|
raise SerialException("could not open port %s: %s" % (self.portstr, msg))
|
||
|
|
# Setup a 4k buffer
|
||
|
|
win32file.SetupComm(self.hComPort, 4096, 4096)
|
||
|
|
|
||
|
|
#Save original timeout values:
|
||
|
|
self._orgTimeouts = win32file.GetCommTimeouts(self.hComPort)
|
||
|
|
|
||
|
|
self._rtsState = win32file.RTS_CONTROL_ENABLE
|
||
|
|
self._dtrState = win32file.DTR_CONTROL_ENABLE
|
||
|
|
|
||
|
|
self._reconfigurePort()
|
||
|
|
|
||
|
|
# Clear buffers:
|
||
|
|
# Remove anything that was there
|
||
|
|
win32file.PurgeComm(self.hComPort,
|
||
|
|
win32file.PURGE_TXCLEAR | win32file.PURGE_TXABORT |
|
||
|
|
win32file.PURGE_RXCLEAR | win32file.PURGE_RXABORT)
|
||
|
|
|
||
|
|
self._overlappedRead = win32file.OVERLAPPED()
|
||
|
|
self._overlappedRead.hEvent = win32event.CreateEvent(None, 1, 0, None)
|
||
|
|
self._overlappedWrite = win32file.OVERLAPPED()
|
||
|
|
#~ self._overlappedWrite.hEvent = win32event.CreateEvent(None, 1, 0, None)
|
||
|
|
self._overlappedWrite.hEvent = win32event.CreateEvent(None, 0, 0, None)
|
||
|
|
self._isOpen = True
|
||
|
|
|
||
|
|
def _reconfigurePort(self):
|
||
|
|
"""Set communication parameters on opened port."""
|
||
|
|
if not self.hComPort:
|
||
|
|
raise SerialException("Can only operate on a valid port handle")
|
||
|
|
|
||
|
|
#Set Windows timeout values
|
||
|
|
#timeouts is a tuple with the following items:
|
||
|
|
#(ReadIntervalTimeout,ReadTotalTimeoutMultiplier,
|
||
|
|
# ReadTotalTimeoutConstant,WriteTotalTimeoutMultiplier,
|
||
|
|
# WriteTotalTimeoutConstant)
|
||
|
|
if self._timeout is None:
|
||
|
|
timeouts = (0, 0, 0, 0, 0)
|
||
|
|
elif self._timeout == 0:
|
||
|
|
timeouts = (win32con.MAXDWORD, 0, 0, 0, 0)
|
||
|
|
else:
|
||
|
|
timeouts = (0, 0, int(self._timeout*1000), 0, 0)
|
||
|
|
if self._timeout != 0 and self._interCharTimeout is not None:
|
||
|
|
timeouts = (int(self._interCharTimeout * 1000),) + timeouts[1:]
|
||
|
|
|
||
|
|
if self._writeTimeout is None:
|
||
|
|
pass
|
||
|
|
elif self._writeTimeout == 0:
|
||
|
|
timeouts = timeouts[:-2] + (0, win32con.MAXDWORD)
|
||
|
|
else:
|
||
|
|
timeouts = timeouts[:-2] + (0, int(self._writeTimeout*1000))
|
||
|
|
win32file.SetCommTimeouts(self.hComPort, timeouts)
|
||
|
|
|
||
|
|
win32file.SetCommMask(self.hComPort, win32file.EV_ERR)
|
||
|
|
|
||
|
|
# Setup the connection info.
|
||
|
|
# Get state and modify it:
|
||
|
|
comDCB = win32file.GetCommState(self.hComPort)
|
||
|
|
comDCB.BaudRate = self._baudrate
|
||
|
|
|
||
|
|
if self._bytesize == FIVEBITS:
|
||
|
|
comDCB.ByteSize = 5
|
||
|
|
elif self._bytesize == SIXBITS:
|
||
|
|
comDCB.ByteSize = 6
|
||
|
|
elif self._bytesize == SEVENBITS:
|
||
|
|
comDCB.ByteSize = 7
|
||
|
|
elif self._bytesize == EIGHTBITS:
|
||
|
|
comDCB.ByteSize = 8
|
||
|
|
else:
|
||
|
|
raise ValueError("Unsupported number of data bits: %r" % self._bytesize)
|
||
|
|
|
||
|
|
if self._parity == PARITY_NONE:
|
||
|
|
comDCB.Parity = win32file.NOPARITY
|
||
|
|
comDCB.fParity = 0 # Dis/Enable Parity Check
|
||
|
|
elif self._parity == PARITY_EVEN:
|
||
|
|
comDCB.Parity = win32file.EVENPARITY
|
||
|
|
comDCB.fParity = 1 # Dis/Enable Parity Check
|
||
|
|
elif self._parity == PARITY_ODD:
|
||
|
|
comDCB.Parity = win32file.ODDPARITY
|
||
|
|
comDCB.fParity = 1 # Dis/Enable Parity Check
|
||
|
|
elif self._parity == PARITY_MARK:
|
||
|
|
comDCB.Parity = win32file.MARKPARITY
|
||
|
|
comDCB.fParity = 1 # Dis/Enable Parity Check
|
||
|
|
elif self._parity == PARITY_SPACE:
|
||
|
|
comDCB.Parity = win32file.SPACEPARITY
|
||
|
|
comDCB.fParity = 1 # Dis/Enable Parity Check
|
||
|
|
else:
|
||
|
|
raise ValueError("Unsupported parity mode: %r" % self._parity)
|
||
|
|
|
||
|
|
if self._stopbits == STOPBITS_ONE:
|
||
|
|
comDCB.StopBits = win32file.ONESTOPBIT
|
||
|
|
elif self._stopbits == STOPBITS_TWO:
|
||
|
|
comDCB.StopBits = win32file.TWOSTOPBITS
|
||
|
|
else:
|
||
|
|
raise ValueError("Unsupported number of stop bits: %r" % self._stopbits)
|
||
|
|
|
||
|
|
comDCB.fBinary = 1 # Enable Binary Transmission
|
||
|
|
# Char. w/ Parity-Err are replaced with 0xff (if fErrorChar is set to TRUE)
|
||
|
|
if self._rtscts:
|
||
|
|
comDCB.fRtsControl = win32file.RTS_CONTROL_HANDSHAKE
|
||
|
|
else:
|
||
|
|
comDCB.fRtsControl = self._rtsState
|
||
|
|
if self._dsrdtr:
|
||
|
|
comDCB.fDtrControl = win32file.DTR_CONTROL_HANDSHAKE
|
||
|
|
else:
|
||
|
|
comDCB.fDtrControl = self._dtrState
|
||
|
|
comDCB.fOutxCtsFlow = self._rtscts
|
||
|
|
comDCB.fOutxDsrFlow = self._dsrdtr
|
||
|
|
comDCB.fOutX = self._xonxoff
|
||
|
|
comDCB.fInX = self._xonxoff
|
||
|
|
comDCB.fNull = 0
|
||
|
|
comDCB.fErrorChar = 0
|
||
|
|
comDCB.fAbortOnError = 0
|
||
|
|
comDCB.XonChar = XON
|
||
|
|
comDCB.XoffChar = XOFF
|
||
|
|
|
||
|
|
try:
|
||
|
|
win32file.SetCommState(self.hComPort, comDCB)
|
||
|
|
except win32file.error, e:
|
||
|
|
raise ValueError("Cannot configure port, some setting was wrong. Original message: %s" % e)
|
||
|
|
|
||
|
|
#~ def __del__(self):
|
||
|
|
#~ self.close()
|
||
|
|
|
||
|
|
def close(self):
|
||
|
|
"""Close port"""
|
||
|
|
if self._isOpen:
|
||
|
|
if self.hComPort:
|
||
|
|
try:
|
||
|
|
# Restore original timeout values:
|
||
|
|
win32file.SetCommTimeouts(self.hComPort, self._orgTimeouts)
|
||
|
|
except win32file.error:
|
||
|
|
# ignore errors. can happen for unplugged USB serial devices
|
||
|
|
pass
|
||
|
|
# Close COM-Port:
|
||
|
|
win32file.CloseHandle(self.hComPort)
|
||
|
|
win32file.CloseHandle(self._overlappedRead.hEvent)
|
||
|
|
win32file.CloseHandle(self._overlappedWrite.hEvent)
|
||
|
|
self.hComPort = None
|
||
|
|
self._isOpen = False
|
||
|
|
|
||
|
|
def makeDeviceName(self, port):
|
||
|
|
return device(port)
|
||
|
|
|
||
|
|
# - - - - - - - - - - - - - - - - - - - - - - - -
|
||
|
|
|
||
|
|
def inWaiting(self):
|
||
|
|
"""Return the number of characters currently in the input buffer."""
|
||
|
|
flags, comstat = win32file.ClearCommError(self.hComPort)
|
||
|
|
return comstat.cbInQue
|
||
|
|
|
||
|
|
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.hComPort: raise portNotOpenError
|
||
|
|
if size > 0:
|
||
|
|
win32event.ResetEvent(self._overlappedRead.hEvent)
|
||
|
|
flags, comstat = win32file.ClearCommError(self.hComPort)
|
||
|
|
if self.timeout == 0:
|
||
|
|
n = min(comstat.cbInQue, size)
|
||
|
|
if n > 0:
|
||
|
|
rc, buf = win32file.ReadFile(self.hComPort, win32file.AllocateReadBuffer(n), self._overlappedRead)
|
||
|
|
win32event.WaitForSingleObject(self._overlappedRead.hEvent, win32event.INFINITE)
|
||
|
|
read = str(buf)
|
||
|
|
else:
|
||
|
|
read = ''
|
||
|
|
else:
|
||
|
|
rc, buf = win32file.ReadFile(self.hComPort, win32file.AllocateReadBuffer(size), self._overlappedRead)
|
||
|
|
n = win32file.GetOverlappedResult(self.hComPort, self._overlappedRead, 1)
|
||
|
|
read = str(buf[:n])
|
||
|
|
else:
|
||
|
|
read = ''
|
||
|
|
return read
|
||
|
|
|
||
|
|
def write(self, data):
|
||
|
|
"""Output the given string over the serial port."""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
if not isinstance(data, str):
|
||
|
|
raise TypeError('expected str, got %s' % type(data))
|
||
|
|
#print repr(s),
|
||
|
|
if data:
|
||
|
|
#~ win32event.ResetEvent(self._overlappedWrite.hEvent)
|
||
|
|
err, n = win32file.WriteFile(self.hComPort, data, self._overlappedWrite)
|
||
|
|
if err: #will be ERROR_IO_PENDING:
|
||
|
|
# Wait for the write to complete.
|
||
|
|
#~ win32event.WaitForSingleObject(self._overlappedWrite.hEvent, win32event.INFINITE)
|
||
|
|
n = win32file.GetOverlappedResult(self.hComPort, self._overlappedWrite, 1)
|
||
|
|
if n != len(data):
|
||
|
|
raise writeTimeoutError
|
||
|
|
|
||
|
|
|
||
|
|
def flushInput(self):
|
||
|
|
"""Clear input buffer, discarding all that is in the buffer."""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
win32file.PurgeComm(self.hComPort, win32file.PURGE_RXCLEAR | win32file.PURGE_RXABORT)
|
||
|
|
|
||
|
|
def flushOutput(self):
|
||
|
|
"""Clear output buffer, aborting the current output and
|
||
|
|
discarding all that is in the buffer."""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
win32file.PurgeComm(self.hComPort, win32file.PURGE_TXCLEAR | win32file.PURGE_TXABORT)
|
||
|
|
|
||
|
|
def sendBreak(self, duration=0.25):
|
||
|
|
"""Send break condition. Timed, returns to idle state after given duration."""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
import time
|
||
|
|
win32file.SetCommBreak(self.hComPort)
|
||
|
|
time.sleep(duration)
|
||
|
|
win32file.ClearCommBreak(self.hComPort)
|
||
|
|
|
||
|
|
def setBreak(self, level=1):
|
||
|
|
"""Set break: Controls TXD. When active, to transmitting is possible."""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
if level:
|
||
|
|
win32file.SetCommBreak(self.hComPort)
|
||
|
|
else:
|
||
|
|
win32file.ClearCommBreak(self.hComPort)
|
||
|
|
|
||
|
|
def setRTS(self, level=1):
|
||
|
|
"""Set terminal status line: Request To Send"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
if level:
|
||
|
|
self._rtsState = win32file.RTS_CONTROL_ENABLE
|
||
|
|
win32file.EscapeCommFunction(self.hComPort, win32file.SETRTS)
|
||
|
|
else:
|
||
|
|
self._rtsState = win32file.RTS_CONTROL_DISABLE
|
||
|
|
win32file.EscapeCommFunction(self.hComPort, win32file.CLRRTS)
|
||
|
|
|
||
|
|
def setDTR(self, level=1):
|
||
|
|
"""Set terminal status line: Data Terminal Ready"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
if level:
|
||
|
|
self._dtrState = win32file.DTR_CONTROL_ENABLE
|
||
|
|
win32file.EscapeCommFunction(self.hComPort, win32file.SETDTR)
|
||
|
|
else:
|
||
|
|
self._dtrState = win32file.DTR_CONTROL_DISABLE
|
||
|
|
win32file.EscapeCommFunction(self.hComPort, win32file.CLRDTR)
|
||
|
|
|
||
|
|
def getCTS(self):
|
||
|
|
"""Read terminal status line: Clear To Send"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
return MS_CTS_ON & win32file.GetCommModemStatus(self.hComPort) != 0
|
||
|
|
|
||
|
|
def getDSR(self):
|
||
|
|
"""Read terminal status line: Data Set Ready"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
return MS_DSR_ON & win32file.GetCommModemStatus(self.hComPort) != 0
|
||
|
|
|
||
|
|
def getRI(self):
|
||
|
|
"""Read terminal status line: Ring Indicator"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
return MS_RING_ON & win32file.GetCommModemStatus(self.hComPort) != 0
|
||
|
|
|
||
|
|
def getCD(self):
|
||
|
|
"""Read terminal status line: Carrier Detect"""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
return MS_RLSD_ON & win32file.GetCommModemStatus(self.hComPort) != 0
|
||
|
|
|
||
|
|
# - - platform specific - - - -
|
||
|
|
|
||
|
|
def setXON(self, level=True):
|
||
|
|
"""Platform specific - set flow state."""
|
||
|
|
if not self.hComPort: raise portNotOpenError
|
||
|
|
if level:
|
||
|
|
win32file.EscapeCommFunction(self.hComPort, win32file.SETXON)
|
||
|
|
else:
|
||
|
|
win32file.EscapeCommFunction(self.hComPort, win32file.SETXOFF)
|
||
|
|
|
||
|
|
#Nur Testfunktion!!
|
||
|
|
if __name__ == '__main__':
|
||
|
|
s = Serial(0)
|
||
|
|
print s
|
||
|
|
|
||
|
|
s = Serial()
|
||
|
|
print s
|
||
|
|
|
||
|
|
|
||
|
|
s.baudrate = 19200
|
||
|
|
s.databits = 7
|
||
|
|
s.close()
|
||
|
|
s.port = 0
|
||
|
|
s.open()
|
||
|
|
print s
|
||
|
|
|