def setup_buffer(self):
'''
The following is for setting the digitizer up in a buffering mode
'''
self.checkADCOverload()
self.capture_ref = PXIDigitizer_wrapper.afDigitizerCaptureIQ_t()
self.timeout = int(1000*self.nSamples/self.bandwidth+10000)
i_ctypes = self.i_buffer.ctypes.data_as(POINTER(c_float))
q_ctypes = self.q_buffer.ctypes.data_as(POINTER(c_float))
self.buffer_ref = PXIDigitizer_wrapper.afDigitizerBufferIQ_t(
i_ctypes, q_ctypes, self.nSamples)
self.buffer_ref_pointer = pointer(self.buffer_ref)
def __init__(self, adressDigi='3036D1', adressLo='3011D1',
LoPosAB=1, LoRef=0, name='D', cfreq=4.57e9, inputlvl=30,
start=4.43e9, stop=0, pt=1, nSample=1e6, sampFreq=1e5,
buffmode=True):
self.ADCFAIL = False
self.capture_ref = None
self.ADCoverflow = 0
self.buffmode = buffmode
self.bandwidth = sampFreq
self.removeDCoff = 0
self.LoPos = LoPosAB # Lo Above (1) or Below (0)
self.freq = cfreq
self.nSamples = int(nSample) # Samples taken/trigger
self.inputLvl = inputlvl
self.Overload = 0
self.LoRef = LoRef # 0=ocxo, 1=int 2=extDaisy, 3=extTerminated
self.trig_source = 8 # 8=Star, 32=SW, 35=internal
self.adressLo = adressLo
self.adressDigi = adressDigi
self.name = name
self.start = start
self.stop = stop
self.pt = pt
self.lin = np.linspace(self.start, self.stop, self.pt)
self.digitizer = PXIDigitizer_wrapper.afDigitizer_BS()
self.prep_data()
self.performOpen()
self.set_settings()
if self.buffmode:
self.setup_buffer()
def performOpen(self):
if hasattr(self, 'digitizer'):
''' If Digitizer exists then close it first
and then reopen it '''
self.performClose()
self.digitizer = PXIDigitizer_wrapper.afDigitizer_BS()
try:
# self.digitizer.create_object()
self.digitizer.boot_instrument(self.adressLo, self.adressDigi)
print 'Digitizer ', self.name, ' started'
except PXIDigitizer_wrapper.Error as e:
print "Digitizer start failed"
self.digitizer.close_instrument()
self.digitizer.destroy_object()
raise Exception(e)
def performOpen(self, options={}):
"""Perform the operation of opening the instrument connection"""
# check communication
try:
# open connection
self.digitizer = PXIDigitizer_wrapper.afDigitizer_BS()
self.digitizer.create_object()
# get address strings
sVisaDigitizer = self.dComCfg['address']
sVisaLO = self.getValue('Local oscillator VISA')
# keep track of number of samples and old I,Q,R and theta values
self.nSamples = int(self.getValue('Number of samples'))
self.nTriggers = int(self.getValue('Number of triggers'))
self.nAverages_per_trigger = int(self.getValue('Averages per trigger'))
self.Overload = 0
self.cAvgSignal = None
self.cAvgSignal2 = None
self.cTrace = None
self.vPTrace = None
self.vPowerMeanUnAvg = None
self.MeanMag = None
self.MeanPhas = None
self.vMeanUnAvg = None
self.cRaw = None
self.dPower = None
self.bRaw = self.getValue('Retrive raw data')
self.bCollectHistogram = self.getValue('Collect IQ Histogram')
self.nAbove = 0
self.bSetBandWidth = self.getValue('Set IQ Bandwidth manually')
self.dBandWidthAim = self.getValue('IQ Bandwidth')
self.dBandWidthAcc = self.getValue('IQ Bandwidth')
self.bCutTrace = self.getValue('Cut out part of the trace')
self.nStartSample = int(self.getValue('Start Sample'))
self.nStopSample = int(self.getValue('Stop Sample'))
self.nHistPath = self.getValue('Histogram path')
self.dFreq = self.getValue('RF Frequency')
self.nBins = 0
self.sHistPath = self.getValue('Histogram path')
# boot instruments
self.digitizer.boot_instrument(sVisaLO, sVisaDigitizer)
# set modulation mode to generic
self.digitizer.modulation_mode_set(5)
except PXIDigitizer_wrapper.Error as e:
# re-cast afdigitizer errors as a generic communication error
msg = str(e)
raise InstrumentDriver.CommunicationError(msg)
