Digital Channel acquired and saved to TDMS file, Read then search for nth Edge: Efficient Method Recommendation

Hello LabVIEW Community,

I am currently working on a project where I need to search for the nth rising edge on a digital channel that I have acquired and saved to a TDMS file.

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MY CONTEXT:

I used a NI-MIO 6363 to acquire a digital signal. This card does not support NI-HSDIO API as I am told.

I read from the TDMS entire channel as a long 1D array of Booleans, then compute two arrays:

• One containing indexes of rising edges,
• The other containing indexes of falling edges,

then if I want the 3^rd rising edge, it’s easy: it’s element #3 in the rising array.

The above works in most cases, except if I acquire 1 minute of a 10MHz square wave, my computed transition arrays become too big and cause a computer freeze.

SOLUTION #1:

• I am about to implement this: Update the above code to do the edge index computations by reading chunks instead of the entire channel.

POSSIBLE SOLUTION #2?

• Is there a built-in feature in the TDMS API or in DAQmx that already does this?

Could anyone provide guidance?

Thank you in advance for your assistance,

With Best regards,

Rollin