how to analogOut on ad2 in a loop with varying amplitude

[mikeyc]

Hi there,

I am trying to generate analogOut on the ad2 using the python sdk. In particular, I wish to change the amplitude and generate the waveform repeatedly. this code generates nothing, any ideas? Cheers - m

 

    channel = c_int(0)
    result = dwf.FDwfAnalogOutNodeEnableSet(hdwf, channel, AnalogOutNodeCarrier, c_int(1))
    result = dwf.FDwfAnalogOutIdleSet(hdwf, channel, c_int(1)) # DwfAnalogOutIdleOffset

    result = dwf.FDwfAnalogOutNodeFunctionSet(hdwf, channel, AnalogOutNodeCarrier, funcPlayPattern) #funcCustom funcPlayPattern)
    result = dwf.FDwfAnalogOutNodeDataSet(hdwf, channel, AnalogOutNodeCarrier, rgdSamples, int(cSamples))
    if result != 1:
        print(f'FAILED TO LOAD WAVEFORM, result = {result:d}')
        breakpoint()

    result = dwf.FDwfAnalogOutNodeFrequencySet(hdwf, channel, AnalogOutNodeCarrier, c_double(pulseParams["Fs_Hz"])) 
    result = dwf.FDwfAnalogOutWaitSet(hdwf, channel, c_double( pulseParams["delayBetweenPulses_s"])) # run for pattern duration

    result = dwf.FDwfAnalogOutRepeatTriggerSet(hdwf, channel, c_int(pulseParams["repeatTrigger"]))

    # supports value up to 32768 or use 0 for infinite repeat
    print(f'Number of pulses: {pulseParams["numPulses"]:d}')
    result = dwf.FDwfAnalogOutRepeatSet(hdwf, channel, c_int(pulseParams["numPulses"])) # repeat N times

    result = dwf.FDwfAnalogOutConfigure(hdwf, channel, c_int(3)) # auto configure 0 disabled, 1 enabled, 3 dynamic
    print("Generating trigger...")
    sts = c_ubyte(0)
    for amplitude in pulseParams["amplitude_Vpp"]:
        result = dwf.FDwfAnalogOutNodeAmplitudeSet(hdwf, channel, AnalogOutNodeCarrier, c_double(amplitude)) 
        result = dwf.FDwfAnalogOutRunSet(hdwf, channel, c_double(cSamples/pulseParams["Fs_Hz"])) # run for pattern duration
        #dwf.FDwfDeviceTriggerSet( hdwf, int idxPin, trigsrcPC) # trigsrcExternal1  trigsrcPC
        result = dwf.FDwfAnalogOutTriggerSourceSet(hdwf, channel, trigsrcExternal1 ) # 11 = trigsrcExternal1
        #result = dwf.FDwfAnalogOutConfigure(hdwf, channel, c_int(1))
        while True:
            result = dwf.FDwfAnalogOutStatus(hdwf, channel,  byref(sts))
            #print(f'result = {result:d} ; sts = {sts.value : d}')
            if sts.value == DwfStateDone.value : break # DwfStateDone, see AnalogOut_play.py example
        print(f'Amplitude {amplitude:f} complete')

[attila]

Hi @mikeyc

Uncomment your 'result = dwf.FDwfAnalogOutConfigure(hdwf, channel, c_int(1))'