def _write(self, cmdString):
try:
writeString = cmdString + self.DELIM
bytesWritten = self.ser.write(writeString)
if len(writeString) != bytesWritten:
raise dae_RelayBoard_Common.Denkovi_Exception(
"Error during write")
except (serial.SerialException, serial.SerialTimeoutException):
raise dae_RelayBoard_Common.Denkovi_Exception(
"Error while writing")
def _read(self, numBytes):
try:
retString = self.ser.read(size=numBytes)
if len(retString) < numBytes:
raise dae_RelayBoard_Common.Denkovi_Exception(
"Timeout waiting for response")
return retString
except (serial.SerialException, serial.SerialTimeoutException):
raise dae_RelayBoard_Common.Denkovi_Exception(
"Error while writing")
def getState(self, relay):
self._checkInit()
if relay > self.NUMRELAYS or relay < 1:
raise dae_RelayBoard_Common.Denkovi_Exception(
"Relay Index out of bounds")
stateByte = self._readByte()
return self._getState(stateByte, relay)
def initialise(self, deviceID, baudRate, mask, bitMode):
try:
for dev in self.driver.list_devices():
if re.search(deviceID + '.+', dev[2]):
deviceID = dev[2]
print('Found device ' + deviceID)
break
if deviceID is None:
raise dae_RelayBoard_Common.Denkovi_Exception(
'No board connected')
self.bb = BitBangDevice(deviceID)
self.bb.direction = mask
self.bb.open()
except Exception as e:
raise dae_RelayBoard_Common.Denkovi_Exception(
'Could not connect to relay board: %s: %s' % (e.__class__, e))
def _prepForCmd(self):
if self.ser == None:
raise dae_RelayBoard_Common.Denkovi_Exception(
"Board Not Initialised")
else:
time.sleep(self.cmdDelay)
self.ser.flushInput()
self.ser.flushOutput()
def getState(self, relay):
if relay > self.NUMRELAYS or relay < 1:
raise dae_RelayBoard_Common.Denkovi_Exception(
"Relay Index out of bound")
else:
self._prepForCmd()
stateString = self._getStateString()
return self._getState(relay, stateString)
def setState(self, relay, on):
self._checkInit()
if relay > self.NUMRELAYS or relay < 1:
raise dae_RelayBoard_Common.Denkovi_Exception(
"Relay Index out of bounds")
stateByte = self._readByte()
toggle = 1 << self._getBitIndex(relay)
if on:
relState = stateByte | toggle
else:
relState = stateByte & ~toggle
self._writeByte(relState)
def setState(self, relay, on):
if relay > self.NUMRELAYS or relay < 1:
raise dae_RelayBoard_Common.Denkovi_Exception(
"Relay Index out of bound")
else:
self._prepForCmd()
if on:
stateString = "+"
else:
stateString = "-"
numString = "%02d" % relay
self._write(numString + stateString)
def _connectToSerial(self):
try:
return serial.Serial(
port=self.portstring,
baudrate=9600,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.EIGHTBITS,
xonxoff=0, # no software flow control
rtscts=0, # no RTS/CTS flow control
timeout=self.TIMEOUT,
writeTimeout=self.TIMEOUT)
except serial.SerialException:
raise dae_RelayBoard_Common.Denkovi_Exception(
"Could not connect to relay board")
def readByte(self):
if self.bb is None:
raise dae_RelayBoard_Common.Denkovi_Exception(
'Board non initialized')
return self.bb.port
def writeByte(self, byte):
if self.bb is None:
raise dae_RelayBoard_Common.Denkovi_Exception(
'Board non initialized')
self.bb.port = byte
def _checkInit(self):
if self.FTD2XX is None:
raise dae_RelayBoard_Common.Denkovi_Exception(
"FTD2XX module not initialised")
def _handleRet(self, ret):
if ret[0] != FTD2XXDllWrap.FT_OK:
raise dae_RelayBoard_Common.Denkovi_Exception(
self._getErrString(ret))
return ret
def _checkInit(self):
if self.handle is None:
raise dae_RelayBoard_Common.Denkovi_Exception(
"FTD2XXWindows device not initialised")
def _checkInit(self):
if self.relayHandler is None:
raise dae_RelayBoard_Common.Denkovi_Exception(
"No supported board has been successfully initialised")