How to perform continuous sampling with DAQmx using threads?



  • Background:
    I need to continuously sample a signal at 10MHz and display each 1024*1024 chunks of data as an image. I use NI DAQmx to collect data and NI Vision to display the data on the screen, all through the QT Creator.
    The raw data is supplied from NI PCI-6259 in uInt32 format. So, after reading a chunk of data, I have to downcast it to uInt16 before displaying. Reading, downcasting and displaying the data takes long enough to miss samples.

    Problem:
    How can I implement the script to read the data continuously? I was thinking about threads, but I do not have enough knowledge to even know if this approach could work. I think that DAQmx Task must be the same (and only one) for all of the threads. Thus, if I understand correctly, I can not call the TASK in two threads simultaneously.

    If someone could give me an insight on how this could be done, I would appreciate it. Perhaps, a pseudo-code, so I could get the concept behind this approach? Any other suggestions on how the sampling could be implemented?


  • Lifetime Qt Champion

    Hi,

    How is that related to Qt ?


  • Moderators

    Hi,

    Your question is about how to use DAQmx, so your best bet is to


Log in to reply
 

Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.