def receivebyte(self, RDtimeout=0):
"""read num bytes from serial port"""
if not self.hComPort: raise portNotOpenError
timeouts = (win32con.MAXDWORD, win32con.MAXDWORD, int(RDtimeout * 100),
0, 0) # timeouts in 100 ms units...
win32file.SetCommTimeouts(self.hComPort, timeouts)
win32event.ResetEvent(self._overlappedRead.hEvent)
flags, comstat = win32file.ClearCommError(self.hComPort)
n = comstat.cbInQue
if n > 0: # there is data in buffer
rc, buf = win32file.ReadFile(self.hComPort,
win32file.AllocateReadBuffer(1),
self._overlappedRead)
win32event.WaitForSingleObject(self._overlappedRead.hEvent,
win32event.INFINITE)
read = buf[0]
else:
rc, buf = win32file.ReadFile(self.hComPort,
win32file.AllocateReadBuffer(1),
self._overlappedRead)
n = win32file.GetOverlappedResult(self.hComPort,
self._overlappedRead, 1)
if n > 0:
read = buf[0]
else:
read = -1
return read
def close(self):
"""close port"""
if self.hComPort:
#Restore original timeout values:
win32file.SetCommTimeouts(self.hComPort, self.orgTimeouts)
#Close COM-Port:
win32file.CloseHandle(self.hComPort)
self.hComPort = None
def _reconfigureTimeout(self):
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._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)
def sendbyte(self, byte, WRtimeout):
"""write string to serial port"""
if not self.hComPort: raise portNotOpenError
timeouts = (0, 0, 0, 0, int(WRtimeout * 100)
) # timeouts in 100 ms units...
win32file.SetCommTimeouts(self.hComPort, timeouts)
err, n = win32file.WriteFile(self.hComPort, byte,
self._overlappedWrite)
if err == 0: #will be ERROR_IO_PENDING:
# Wait for the write to complete? Or give up and return error?
# win32event.WaitForSingleObject(self._overlappedWrite.hEvent, win32event.INFINITE)
return -1
else:
return 1
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 close(self):
"""Close port"""
if self._isOpen:
if self.hComPort:
#Restore original timeout values:
win32file.SetCommTimeouts(self.hComPort, self._orgTimeouts)
#Close COM-Port:
win32file.CloseHandle(self.hComPort)
# Bugfix: #1520357. Close event handles.
win32file.CloseHandle(self._overlappedRead.hEvent)
win32file.CloseHandle(self._overlappedWrite.hEvent)
# End bugfix #1520357.
self.hComPort = None
self._isOpen = False
def __init__(self, sDevice, sMode):
try:
sDevice = '\\\\.\\' + sDevice
self._oFd = win32file.CreateFile(
sDevice, win32con.GENERIC_READ | win32con.GENERIC_WRITE, 0,
None, win32con.OPEN_EXISTING, 0, 0)
except:
print('Failed to open COM port ' + sDevice)
self._oFd = 0
raise CommException
return
tCommTimeouts = (sys.maxsize, 0, 1000, 0, 1000)
win32file.SetCommTimeouts(self._oFd, tCommTimeouts)
win32file.PurgeComm(
self._oFd, win32file.PURGE_TXABORT | win32file.PURGE_RXABORT
| win32file.PURGE_TXCLEAR | win32file.PURGE_RXCLEAR)
cCommDeviceBase.__init__(self, sDevice, sMode)
return
def readbyte(self):
"""read a byte from serial port what's in it..."""
if not self.hComPort: raise portNotOpenError
timeouts = (win32con.MAXDWORD, 0, 0, 0, 0)
win32file.SetCommTimeouts(self.hComPort, timeouts)
win32event.ResetEvent(self._overlappedRead.hEvent)
flags, comstat = win32file.ClearCommError(self.hComPort)
n = comstat.cbInQue
if n > 0:
rc, buf = win32file.ReadFile(self.hComPort,
win32file.AllocateReadBuffer(1),
self._overlappedRead)
win32event.WaitForSingleObject(self._overlappedRead.hEvent,
win32event.INFINITE)
read = buf[0]
else:
read = -1
return read
def close(self):
"""close port"""
if self.hComPort:
#Wait until data is transmitted, but not too long... (Timeout-Time)
#while 1:
# flags, comState = win32file.ClearCommError(hComPort)
# if comState.cbOutQue <= 0 or calcTimeout(startTime) > timeout:
# break
self.setRTS(0)
self.setDTR(0)
#Clear buffers:
win32file.PurgeComm(self.hComPort,
win32file.PURGE_TXCLEAR | win32file.PURGE_TXABORT |
win32file.PURGE_RXCLEAR | win32file.PURGE_RXABORT)
#Restore original timeout values:
win32file.SetCommTimeouts(self.hComPort, self.orgTimeouts)
#Close COM-Port:
win32file.CloseHandle(self.hComPort)
self.hComPort = None
def __init__(self, sDevice, sMode):
oSecurityAttributes = pywintypes.SECURITY_ATTRIBUTES()
oSecurityAttributes.bInheritHandle = 1
try:
sDevice = '\\\\.\\' + sDevice
self._oFd = win32file.CreateFile(
sDevice, win32con.GENERIC_READ | win32con.GENERIC_WRITE, 0,
oSecurityAttributes, win32con.OPEN_EXISTING,
win32file.FILE_FLAG_OVERLAPPED, 0)
except:
print('Failed to open COM port' + sDevice)
self._oFd = 0
return
win32file.SetCommMask(self._oFd, win32file.EV_RXCHAR)
win32file.SetupComm(self._oFd, 4096, 4096)
win32file.PurgeComm(
self._oFd, win32file.PURGE_TXABORT | win32file.PURGE_RXABORT
| win32file.PURGE_TXCLEAR | win32file.PURGE_RXCLEAR)
tCommTimeouts = (1000, 2, 2000, 2, 1000)
win32file.SetCommTimeouts(self._oFd, tCommTimeouts)
cCommDeviceBase.__init__(self, sDevice, sMode)
class Serial(serialutil.FileLike):
def __init__(
self,
port, #number of device, numbering starts at
#zero. if everything fails, the user
#can specify a device string, note
#that this isn't portable anymore
baudrate=9600, #baudrate
bytesize=EIGHTBITS, #number of databits
parity=PARITY_NONE, #enable parity checking
stopbits=STOPBITS_ONE, #number of stopbits
timeout=None, #set a timeout value, None for waiting forever
xonxoff=0, #enable software flow control
rtscts=0, #enable RTS/CTS flow control
):
"""initialize comm port"""
self.timeout = timeout
if type(port) == type(''): #strings are taken directly
self.portstr = port
else:
# CSS 20040528 - open wasn't working for COM10 and greater, but by
# chance the '\\.\COM10' format seems to work, yay! But, only use
# if for COM10 and greater in case it introduces some other
# incompatibility.
if port < 9:
self.portstr = 'COM%d' % (
port + 1) #numbers are transformed to a string
else:
self.portstr = '\\\\.\\COM%d' % (port + 1) #WIN NT format??
try:
self.hComPort = win32file.CreateFile(
self.portstr,
win32con.GENERIC_READ | win32con.GENERIC_WRITE,
0, # exclusive access
None, # no security
win32con.OPEN_EXISTING,
win32con.FILE_ATTRIBUTE_NORMAL | win32con.FILE_FLAG_OVERLAPPED,
None)
except Exception, msg:
self.hComPort = None #'cause __del__ is called anyway
raise serialutil.SerialException, "could not open port: %s" % msg
# Setup a 4k buffer
win32file.SetupComm(self.hComPort, 4096, 4096)
#Save original timeout values:
self.orgTimeouts = win32file.GetCommTimeouts(self.hComPort)
#Set Windows timeout values
#timeouts is a tuple with the following items:
#(ReadIntervalTimeout,ReadTotalTimeoutMultiplier,
# ReadTotalTimeoutConstant,WriteTotalTimeoutMultiplier,
# WriteTotalTimeoutConstant)
if timeout is None:
timeouts = (0, 0, 0, 0, 0)
elif timeout == 0:
timeouts = (win32con.MAXDWORD, 0, 0, 0, 0)
else:
#timeouts = (0, 0, 0, 0, 0) #timeouts are done with WaitForSingleObject
#timeouts = (win32con.MAXDWORD, 0, 0, 0, 1000) #doesn't works
#timeouts = (timeout*1000, 0, timeout*1000, 0, 0)
timeouts = (0, 0, timeout * 1000, 0, timeout * 1000)
win32file.SetCommTimeouts(self.hComPort, timeouts)
#win32file.SetCommMask(self.hComPort, win32file.EV_RXCHAR | win32file.EV_TXEMPTY |
# win32file.EV_RXFLAG | win32file.EV_ERR)
win32file.SetCommMask(
self.hComPort,
win32file.EV_RXCHAR | win32file.EV_RXFLAG | win32file.EV_ERR)
#win32file.SetCommMask(self.hComPort, win32file.EV_ERR)
# Setup the connection info.
# Get state and modify it:
comDCB = win32file.GetCommState(self.hComPort)
comDCB.BaudRate = baudrate
if bytesize == FIVEBITS:
comDCB.ByteSize = 5
elif bytesize == SIXBITS:
comDCB.ByteSize = 6
elif bytesize == SEVENBITS:
comDCB.ByteSize = 7
elif bytesize == EIGHTBITS:
comDCB.ByteSize = 8
if parity == PARITY_NONE:
comDCB.Parity = win32file.NOPARITY
comDCB.fParity = 0 # Dis/Enable Parity Check
elif parity == PARITY_EVEN:
comDCB.Parity = win32file.EVENPARITY
comDCB.fParity = 1 # Dis/Enable Parity Check
elif parity == PARITY_ODD:
comDCB.Parity = win32file.ODDPARITY
comDCB.fParity = 1 # Dis/Enable Parity Check
if stopbits == STOPBITS_ONE:
comDCB.StopBits = win32file.ONESTOPBIT
elif stopbits == STOPBITS_TWO:
comDCB.StopBits = win32file.TWOSTOPBITS
comDCB.fBinary = 1 # Enable Binary Transmission
# Char. w/ Parity-Err are replaced with 0xff (if fErrorChar is set to TRUE)
if rtscts:
comDCB.fRtsControl = win32file.RTS_CONTROL_HANDSHAKE
comDCB.fDtrControl = win32file.DTR_CONTROL_HANDSHAKE
else:
comDCB.fRtsControl = win32file.RTS_CONTROL_ENABLE
comDCB.fDtrControl = win32file.DTR_CONTROL_ENABLE
comDCB.fOutxCtsFlow = rtscts
comDCB.fOutxDsrFlow = rtscts
comDCB.fOutX = xonxoff
comDCB.fInX = xonxoff
comDCB.fNull = 0
comDCB.fErrorChar = 0
comDCB.fAbortOnError = 0
win32file.SetCommState(self.hComPort, comDCB)
# Clear buffers:
# Remove anything that was there
win32file.PurgeComm(
self.hComPort, win32file.PURGE_TXCLEAR | win32file.PURGE_TXABORT
| win32file.PURGE_RXCLEAR | win32file.PURGE_RXABORT)
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 mSetCommTimeouts(self, tCommTimeouts):
win32file.SetCommTimeouts(self._oFd, tCommTimeouts)
def __init__(self,
port, #number of device, numbering starts at
#zero. if everything fails, the user
#can specify a device string, note
#that this isn't portable anymore
baudrate=9600, #baudrate
bytesize=EIGHTBITS, #number of databits
parity=PARITY_NONE, #enable parity checking
stopbits=STOPBITS_ONE, #number of stopbits
timeout=None, #set a timeout value, None for waiting forever
xonxoff=0, #enable software flow control
rtscts=0, #enable RTS/CTS flow control
):
"""initialize comm port"""
self.timeout = timeout
if type(port) == type(''): #strings are taken directly
self.portstr = port
else:
self.portstr = 'COM%d' % (port+1) #numbers are transformed to a string
#self.portstr = '\\\\.\\COM%d' % (port+1) #WIN NT format??
self.hComPort = win32file.CreateFile(self.portstr,
win32con.GENERIC_READ | win32con.GENERIC_WRITE,
0, # exclusive access
None, # no security
win32con.OPEN_EXISTING,
win32con.FILE_ATTRIBUTE_NORMAL | win32con.FILE_FLAG_OVERLAPPED,
None)
# Setup a 4k buffer
win32file.SetupComm(self.hComPort, 4096, 4096)
#Save original timeout values:
self.orgTimeouts = win32file.GetCommTimeouts(self.hComPort)
#Set Windows timeout values
#timeouts is a tuple with the following items:
#(ReadIntervalTimeout,ReadTotalTimeoutMultiplier,
# ReadTotalTimeoutConstant,WriteTotalTimeoutMultiplier,
# WriteTotalTimeoutConstant)
if timeout:
timeouts = (timeout*1000, 0, timeout*1000, 0, 0)
else:
#timeouts = (win32con.MAXDWORD, 1, 0, 1, 0)
timeouts = (win32con.MAXDWORD, 0, 0, 0, 1000)
win32file.SetCommTimeouts(self.hComPort, timeouts)
#win32file.SetCommMask(self.hComPort, win32file.EV_RXCHAR | win32file.EV_TXEMPTY |
# win32file.EV_RXFLAG | win32file.EV_ERR)
win32file.SetCommMask(self.hComPort,
win32file.EV_RXCHAR | win32file.EV_RXFLAG | win32file.EV_ERR)
#win32file.SetCommMask(self.hComPort, win32file.EV_ERR)
# Setup the connection info.
# Get state and modify it:
comDCB = win32file.GetCommState(self.hComPort)
comDCB.BaudRate = baudrate
if bytesize == FIVEBITS:
comDCB.ByteSize = 5
elif bytesize == SIXBITS:
comDCB.ByteSize = 6
elif bytesize == SEVENBITS:
comDCB.ByteSize = 7
elif bytesize == EIGHTBITS:
comDCB.ByteSize = 8
if parity == PARITY_NONE:
comDCB.Parity = win32file.NOPARITY
comDCB.fParity = 0 # Dis/Enable Parity Check
elif parity == PARITY_EVEN:
comDCB.Parity = win32file.EVENPARITY
comDCB.fParity = 1 # Dis/Enable Parity Check
elif parity == PARITY_ODD:
comDCB.Parity = win32file.ODDPARITY
comDCB.fParity = 1 # Dis/Enable Parity Check
if stopbits == STOPBITS_ONE:
comDCB.StopBits = win32file.ONESTOPBIT
elif stopbits == STOPBITS_TWO:
comDCB.StopBits = win32file.TWOSTOPBITS
comDCB.fBinary = 1 # Enable Binary Transmission
# Char. w/ Parity-Err are replaced with 0xff (if fErrorChar is set to TRUE)
if rtscts:
comDCB.fRtsControl = win32file.RTS_CONTROL_HANDSHAKE
comDCB.fDtrControl = win32file.DTR_CONTROL_HANDSHAKE
else:
comDCB.fRtsControl = win32file.RTS_CONTROL_ENABLE
comDCB.fDtrControl = win32file.DTR_CONTROL_ENABLE
comDCB.fOutxCtsFlow = rtscts
comDCB.fOutxDsrFlow = rtscts
comDCB.fOutX = xonxoff
comDCB.fInX = xonxoff
comDCB.fNull = 0
comDCB.fErrorChar = 0
comDCB.fAbortOnError = 0
win32file.SetCommState(self.hComPort, comDCB)
# Clear buffers:
# Remove anything that was there
win32file.PurgeComm(self.hComPort,
win32file.PURGE_TXCLEAR | win32file.PURGE_TXABORT |
win32file.PURGE_RXCLEAR | win32file.PURGE_RXABORT)
#print win32file.ClearCommError(self.hComPort) #flags, comState =
self.overlapped = win32file.OVERLAPPED()
self.overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
