class digFreqGenerator(object):
def __init__(self):
self.counter = ''
self.Task = Task()
self.initialized = False
self.initialDelay = 0
self.dutyCycle = 0.50
self.frequency = 1e6
self._numberOfPulses = 0
self.status = 0
self._startTriggerSource = ''
self.triggerType = TriggerType.Software
self.timeout = -1
def _getStartTriggerSource(self):
if self.initialized:
buffSize = uInt32(255)
buff = ctypes.create_string_buffer(buffSize.value)
self.status = self.Task.GetDigEdgeStartTrigSrc(buff, buffSize)
self._startTriggerSource = buff.value
return self._startTriggerSource
def _setStartTriggerSource(self, value):
if self.initialized:
self.status = self.Task.SetDigEdgeStartTrigSrc(value)
#value = self._getStartTriggerSource()
self._startTriggerSource = value
startTriggerSource = property(_getStartTriggerSource,
_setStartTriggerSource)
def _getNumberOfPulses(self):
if self.initialized:
sampPerChan = uInt32()
self.status = self.Task.GetSampQuantSampPerChan(sampPerChan)
self._numberOfPulses = sampPerChan.value
return self._numberOfPulses
def _setNumberOfPulses(self, value):
if self.initialized:
self.status = self.Task.SetSampQuantSampPerChan(value)
if value > 0:
self.status = self.Task.SetSampQuantSampMode(
DAQmx_Val_FiniteSamps)
else:
self.status = self.Task.SetSampQuantSampMode(
DAQmx_Val_ContSamps)
self._numberOfPulses = value
numberOfPulses = property(_getNumberOfPulses, _setNumberOfPulses)
def init(self, counter=None):
if counter is not None:
self.counter = counter
self.status = self.Task.CreateCOPulseChanFreq(self.counter, '',
DAQmx_Val_Hz, DAQmx_Val_Low,
numpy.float64(self.initialDelay),
numpy.float64(self.frequency),
numpy.float64(self.dutyCycle))
if self._numberOfPulses > 0:
self.status = self.Task.CfgImplicitTiming(DAQmx_Val_FiniteSamps,
uInt64(self._numberOfPulses))
else:
self.status = self.Task.CfgImplicitTiming(DAQmx_Val_ContSamps,
uInt64(int(1e6)))
if self.triggerType == TriggerType.Hardware:
self.status = self.Task.CfgDigEdgeStartTrig(
self._startTriggerSource, DAQmx_Val_Rising)
self.status = self.Task.SetStartTrigRetriggerable(bool32(True))
self.initialized = True
def _getOutputTerm(self):
buffSize = uInt32(255)
buff = ctypes.create_string_buffer(buffSize.value)
self.status = self.Task.GetCOPulseTerm(self.counter, buff,
buffSize)
return buff.value
def _setOutputTerm(self, term = 'PFI0'):
self.status = self.Task.SetCOPulseTerm(self.counter, term)
outputTerm = property(_getOutputTerm, _setOutputTerm)
def start(self):
self.status = self.Task.StartTask()
def waitUntilDone(self):
self.status = self.Task.WaitUntilTaskDone(self.timeout)
def stop(self):
retriggerable = bool32()
self.status = self.Task.GetStartTrigRetriggerable(retriggerable)
try:
if retriggerable == 0:
self.status = self.Task.StopTask()
except DAQError as e:
print(e.error)
print(retriggerable.value)
if e.error == 200010 and retriggerable.value == 1:
print('caught')
pass
else:
raise e
def close(self):
self.status = self.Task.ClearTask()
self.Task = Task()
self.initialized = False
