Waveforms, create a wavegen script with a trigger

[jiw]

Hi,

So I want to create a script that sets the wavegen mode to trigger. 

Then I want it move to the next frequency (and turn off output), then move onto a new frequency and wait for a trigger.

So basically: 

1. Set wavegen to sine wave at 1khz

2. Wait for a trigger

3. Output sinewave for a few seconds

 

4. Set sinewave to 10khz

5. Wait for trigger

6. Output sinewave for a few seconds

What's the best way of doing this? I'm having a tough time finding examples. I don't know how to set the wavegen to trigger mode from the script editor or how to create a list of frequencies to cycle through.

Thanks

 

[jiw]

I tried using the SDK, basically I want the analog in to act as the trigger signal to start the analog output wave generator.

However the output starts immediately, before the trigger.

 

#set up acquisition
dwf.FDwfAnalogInFrequencySet(hdwf, c_double(20000000.0))
dwf.FDwfAnalogInBufferSizeSet(hdwf, c_int(8192))
dwf.FDwfAnalogInChannelEnableSet(hdwf, c_int(0), c_bool(True))
dwf.FDwfAnalogInChannelRangeSet(hdwf, c_int(0), c_double(5))

#set up trigger
dwf.FDwfAnalogInTriggerAutoTimeoutSet(hdwf, c_double(0)) # disable auto trigger
dwf.FDwfAnalogInTriggerSourceSet(hdwf, trigsrcDetectorAnalogIn) # one of the analog in channels
dwf.FDwfAnalogInTriggerTypeSet(hdwf, trigtypeEdge)
dwf.FDwfAnalogInTriggerChannelSet(hdwf, c_int(0)) # first channel
dwf.FDwfAnalogInTriggerLevelSet(hdwf, c_double(0.5)) # 0.5V
dwf.FDwfAnalogInTriggerConditionSet(hdwf, trigcondRisingPositive)

print("Getting sine wave ready...")
#                                    AWG 1     carrier
dwf.FDwfAnalogOutNodeEnableSet(hdwf, c_int(0), c_int(0), c_bool(True))
dwf.FDwfAnalogOutNodeFunctionSet(hdwf, c_int(0), c_int(0), funcSine)
dwf.FDwfAnalogOutNodeFrequencySet(hdwf, c_int(0), c_int(0), c_double(freq_test[0]))
dwf.FDwfAnalogOutNodeOffsetSet(hdwf, c_int(0), c_int(0), c_double(0.0))
dwf.FDwfAnalogOutNodeAmplitudeSet(hdwf, c_int(0), c_int(0), c_double(.09))
dwf.FDwfAnalogOutTriggerSourceSet(hdwf, trigsrcAnalogIn)
dwf.FDwfAnalogOutRunSet(hdwf, c_int(0), 3)

dwf.FDwfAnalogInConfigure(hdwf, c_bool(False), c_bool(True))
dwf.FDwfAnalogOutConfigure(hdwf, c_int(0), c_bool(True))
# wait at least 2 seconds with Analog Discovery for the offset to stabilize, before the first reading after device open or offset/range change
time.sleep(2)

 

[jiw]

Ok I got it, the issue is I had to change FDwfAnalogOutTriggerSourceSet to this:

dwf.FDwfAnalogOutTriggerSourceSet(hdwf, c_int(-1), trigsrcAnalogIn)

 

So the full code looks like:

#set up acquisition
dwf.FDwfAnalogInFrequencySet(hdwf, c_double(20000000.0))
dwf.FDwfAnalogInBufferSizeSet(hdwf, c_int(8192))
dwf.FDwfAnalogInChannelEnableSet(hdwf, c_int(0), c_bool(True))
dwf.FDwfAnalogInChannelRangeSet(hdwf, c_int(0), c_double(5))

#set up trigger
dwf.FDwfAnalogInTriggerAutoTimeoutSet(hdwf, c_double(0)) # disable auto trigger
dwf.FDwfAnalogInTriggerSourceSet(hdwf, trigsrcDetectorAnalogIn) # one of the analog in channels
dwf.FDwfAnalogInTriggerTypeSet(hdwf, trigtypeEdge)
dwf.FDwfAnalogInTriggerChannelSet(hdwf, c_int(0)) # first channel
dwf.FDwfAnalogInTriggerLevelSet(hdwf, c_double(0.5)) # 0.5V
dwf.FDwfAnalogInTriggerConditionSet(hdwf, trigcondRisingPositive)

print("Getting sine wave ready...")
#                                    AWG 1     carrier
dwf.FDwfAnalogOutNodeEnableSet(hdwf, c_int(0), c_int(0), c_bool(True))
dwf.FDwfAnalogOutNodeFunctionSet(hdwf, c_int(0), c_int(0), funcSine)
dwf.FDwfAnalogOutNodeFrequencySet(hdwf, c_int(0), c_int(0), c_double(freq_test[0]))
dwf.FDwfAnalogOutNodeOffsetSet(hdwf, c_int(0), c_int(0), c_double(0.0))
dwf.FDwfAnalogOutNodeAmplitudeSet(hdwf, c_int(0), c_int(0), c_double(.09))
dwf.FDwfAnalogOutTriggerSourceSet(hdwf, c_int(-1), trigsrcAnalogIn)
# dwf.FDwfAnalogOutRunSet(hdwf, c_int(0), 3)

dwf.FDwfAnalogInConfigure(hdwf, c_bool(False), c_bool(True))
dwf.FDwfAnalogOutConfigure(hdwf, c_int(0), c_bool(True))

for iTrigger in range(len(freq_test)):
    # reg_ack.write_reg(0x0, 0x1)
    # new acquisition is started automatically after done state 

    while True:
        dwf.FDwfAnalogInStatus(hdwf, c_int(1), byref(sts))
        # print(sts.value == DwfStateArmed.value)
        if sts.value == DwfStateDone.value:
            print("Triggered")
            freq_test_index += 1
            time.sleep(3)
            dwf.FDwfAnalogOutReset(hdwf)
            time.sleep(1)
            dwf.FDwfAnalogOutNodeEnableSet(hdwf, c_int(0), c_int(0), c_bool(True))
            dwf.FDwfAnalogOutNodeFunctionSet(hdwf, c_int(0), c_int(0), funcSine)
            dwf.FDwfAnalogOutNodeFrequencySet(hdwf, c_int(0), c_int(0), c_double(freq_test[iTrigger]))
            dwf.FDwfAnalogOutNodeOffsetSet(hdwf, c_int(0), c_int(0), c_double(0.0))
            dwf.FDwfAnalogOutNodeAmplitudeSet(hdwf, c_int(0), c_int(0), c_double(.09))
            dwf.FDwfAnalogOutTriggerSourceSet(hdwf, c_int(-1), trigsrcAnalogIn)
            dwf.FDwfAnalogOutConfigure(hdwf, c_int(0), c_bool(True))
            # dwf.FDwfAnalogOutRunSet(hdwf, c_int(0), 3)
            time.sleep(2)
            
            break

Second part of the code shows to switch to the next frequency after the trigger. Change it to your liking.

 

Edited November 15, 2021 by jiw