DataAcqusitionToolbox write has a delay

9 vues (au cours des 30 derniers jours)
Kevin
Kevin le 14 Juin 2023
Commenté : Kevin le 15 Juin 2023
I am using a NI DAQ. I have code that follows this skeleton code:
dq = daq(...)
dq.addinput(...)
dq.addoutput(...)
dq.start();
tic
dq.write(some_output)
toc
The issue is that in this timer, MATLAB consistently takes ~ 0.7s longer than expected. For example, if my daq is running at a rate of 1000Hz, and my output is 3000 samples, total time to run would be ~3.7s, rather than an expected 3s.
Digging into the profiler, this seems to be due to just the delay required to start up the hardware for the daq or something related, but I would like to minimize or eliminate this delay. Any ideas?
  2 commentaires
Mario Malic
Mario Malic le 14 Juin 2023
"If the DataAcquisition has both input and output channels, the input acquisition begins and ends at the same time as the output generation, resulting in the same number of scans."
Maybe your output signal is longer?
Kevin
Kevin le 15 Juin 2023
I've confirmed that my output signal should be the exact expected amount of time.

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Mario Malic
Mario Malic le 14 Juin 2023

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