Real-time - how to control speed of digital waveform

Deploying the VI attached to my RT desktop target I generate digital waveform on 8 channels on port0 and acquire data on AI [PXIe-6358].
The digital output frequency and analog input sample frequency are 10000 Hz therefore I expect that while one 8-bit digital code is active [valid] for 100us, one single analog sample is acquired. That means that I would expect one cycle of the while loop to finish in 100us x 2^8 = 100us x 256 = 25600us = 25.6ms.
However what happens is that the while loop finishes in 6ms regardless the set frequency. The loop finishes in 6ms even if I set 5/10/15kHz or if I put a 100us delay into the while loop. I also tried to set the source of the analog input sample clock to 'Dev/do/SampleClock' but nothing seemed to work so far.
How can I force the digital generation to be in correlation with the analog acquisition? I need to acquire 1 data point per channel while the respective digital code is active.
Thanks,
Krivan
Attachments:
RT_ai_dig_wave_gen.vi ‏56 KB

Hello krivan,
Thank you for your post on the forum.
Do you want the digital generation to start at the same time as the analog acquisition?
Shalini B
Applications Engineer
National Instruments UK & Ireland

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please guide me
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Real-time - how to control speed of digital waveform

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