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ADS131E08EVM-PDK: Capturing raw data to file

Erik Gutterud
Intellectual 270 points

Part Number: ADS131E08EVM-PDK
Other Parts Discussed in Thread: ADS131E08

Hello,

I know that the AD131EVM software has a way to save the acquired data, but i need to stream data to a file and save it there. I will be taking allan variance data and i need to run it overnight. Is there a way to do this with the evaluation software? i was unable to find an answer in the users guide.

Thanks in advance.

-Erik

  • 0
    TI__Guru 69166 points
    Hi Erik,

    Thanks for your question!

    The ADS131E08EVM has a fixed limit of samples that it can acquire, so you will not be able to stream data overnight. This was developed awhile ago, but I recall that, in theory, you could collect close to one million points. That's just a guess, but a few 100k points is all that I would reliably expect to collect. These points will be contiguous data points. After collection is complete, they are buffered and transferred to the host PC, so the EVM cannot be used for real-time data acquisition.

    Best Regards,
  • 0 in reply to Ryan Andrews
    Intellectual 270 points
    Thanks for the reply Ryan. Im assuming that you are talking about the # of samples per channel in the eval software correct? I can try that and see if it gets me enough data. Well actually after calculating it, at 2000 samples per sec, and i capture 100k samples, thats... 50 seconds of data. Not enough. Even a million is only 500 seconds.

    Is there a possibility to capture that data as it is being transmitted from the ADC to the host processor? If i cant do that, ill have to get our embedded guys to whip me up some custom firmware which is outside of my current scope on this evaluation...

    Any other ideas i may be able to try?
  • 0 in reply to Erik Gutterud
    TI__Guru 69166 points

    Hi Erik,

    That's really all you can do with the EVM. Our intention is that the evaluation boards gives our customers enough confidence in the device's features and performance to continue their evaluation in their own systems. You should be able to flywire into the daughterboard alone, supply your own power supplies, and use your own motherboard with custom firmware to collect more data directly from the ADS131E08 over longer periods of time. If you save the data to a text file, you can still import that data into the ADS131E08EVM-PDK GUI for further analysis (I don't believe there's any limit there).

    Best Regards,

  • 0 in reply to Ryan Andrews
    Intellectual 270 points

    Hello Ryan and thanks for the reply.

    I pretty much figured that i would need to get someone to whip up some custom firmware. I dont think it will be too difficult to wire up and get working. 

    In the future, you guys should always include a way to save a stream of data. I cant be the only one that wants it. But we will make due. 

    Thanks again for your assistance.

    -Erik

  • 0 in reply to Erik Gutterud
    TI__Guru 69166 points
    Understood, thanks for the feedback. :)