analogdevicesinc
Update external trigger documentation/examples
I am trying to use External Trigger Input Pin TI for initiating dual-channel analog capture in ADALM2000 using the python binding. I am unable to find the exact ways of implementing the same from the document and have the following queries.
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is this possible..?
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if yes, is the below code correct
# Get Trigger Object trig=ain.getTrigger() # Set Analog Trigger Mode as External on TI pin trig.setAnalogMode(0,libm2k.EXTERNAL) trig.setAnalogMode(1,libm2k.EXTERNAL) # set Analog Channel 1 External Trigger Condition as RISING_EDGE_DIGITAL on TI Pin trig.setAnalogExternalCondition(0,libm2k.RISING_EDGE_DIGITAL) # set Analog Channel 2 External Trigger Condition as RISING_EDGE_DIGITAL on TI Pin trig.setAnalogExternalCondition(1,libm2k.RISING_EDGE_DIGITAL) -
if not, is there an alternative way for doing the same?
Thanks in advance. :handshake:
You are missing trig.setAnalogSource(0). This may be a little confusing, but the trigger interface basically works like this: you have two TRIGGER channels - which are different from the regular analog channels. The channel's data is always acquired synchronously, but you can select one of the two TRIGGER channels to synchronize on. Therefore the code should go like this:
trig=ain.getTrigger()
trig.setAnalogMode(0, libm2k.EXTERNAL) # this will set TRIGGER channel 0 to external
trig.setAnalogExternalCondition(0,libm2k.RISING_EDGE_DIGITAL) # this will set TRIGGER channel 0
trig.setAnalogSource(0) # set TRIGGER channel 0 as the source for the analog interface
ain.enableChannel(0, True)
ain.enableChannel(1, True)
ain.getSamples(1024) # the data should only be acquired when external trigger is present
-Adrian
Thanks, @adisuciu for the prompt response, to my surprise using the previously mentioned code (without setAnalogSource()) works as expected. wondering TRIGGER channel 0 is configured as default.
Adding examples and use-cases in the documentation would remove ambiguity with the configuring Triggers
-Aananth