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ADS1262EVM-PDK: Measurement Method in LabVIEW of ADS126xEVM-PDK

user5999495
Prodigy 50 points

Part Number: ADS1262EVM-PDK

I want to collect data in LabVIEW using ADS126xEVM-PDK. Data want to record the output of the vibration acceleration sensor in sampling rate of around 200Hz. However, I do not understand a control method of the hardware on LabVIEW.

Under the present conditions, it is in following states.

1. I can acquire the data using ADCPro.

2. I can acquire data by the sample program of LabVIEW.

3. I can be connected to the hardware by my program of LabVIEW, but do not understand the note method of the register and the transmission method of the command.

Is there any good method? I am happy if you can show me it. Thank you in advance for your help.

  • 0
    TI__Mastermind 44600 points
    Hi,

    Welcome to the TI E2E Forums!

    One thing to be aware of with the ADS1263EVM-PDK, whether you use ADCPro or the stand-alone LabVIEW Driver, is that the LabVIEW application can only collect a limited number of samples within a single "block" but when continuously acquiring data with the EVM the "blocks" may not contain contiguous data (i.e. there may be some samples missing between collection blocks). You can increase the block size size (up to a point) to ensure your samples are all contiguous in time; however, for larger data sets this EVM may not be the best tool for continuous data collection.

    It sounds like the LabVIEW application is working for you; however, you'd like to collect larger data sets, is that correct?

    ...In ADCPro, you can do this using the data recorder tool (see e2e.ti.com/.../2915432 for some instructions on how to use this tools for a single acquire; however, you can also click the "Auto" button and perform continuous collections which will log to multiple files). In the LabVIEW driver, you would simply need to call the Collect subVI multiple times (in a for loop, for example).

    I hope that helps.
  • 0 in reply to Christopher Hall
    Prodigy 50 points

    Hi, Chris

    Thank you for an answer.

     

    I want to collect data by LabVIEW. The continually measurement for example 24 hours consecutive.

     

    1. When a loop handles COLLECT.vi of SUB-VI of the sample program, it takes time more than one second with 1 loop.

    Therefore what is the command (protocol) for the simplest measurement? Can you share a VI example?

    2. Is the connection at the USB-RAW level for this machine? In addition, is the USB pipe "control method “ or" bulk method " or " other “?

     

    Thank you very much for your help.

     

    Kunihiko H.

     

  • 0 in reply to user5999495
    TI__Mastermind 44600 points
    Hi Kunihiko,

    Unless you were to run the ADS1263EVM-PDK at one of its slowest data rates and configure a large block size, I doubt it will be able to collect 24 hours of consecutive data (you can collect multiple blocks of data over this time period, but likely it will have gaps of missing data between blocks).

    The MMB0 collects data into memory and then sends all of the data in memory up to the PC (I believe this done using a bulk transfer). Unfortunately, during this time, the MMB0 does not continue to collect data so between data transfers some of the ADC conversions may not get captured. This is a limitation of the EVM that it does not allow for very long-term data captures.

    The stand-alone LabVIEW driver is the example of how ADCPro captures data. I don't have any other example VIs. Perhaps you could try using a smaller block size (the LabVIEW driver enforces some minimum block size, but I'm not sure of the reason for this); however for small enough block sizes and slow data rates, the MMB0 might be able to transfer data to the PC fast enough so as not to lose any data. Unfortunately, this EVM just wasn't designed to be able to stream real-time data to the PC.
  • 0 in reply to Christopher Hall
    Prodigy 50 points

    Hi, Chris

     

    Thank you for an answer. Thank you for comment about MMB0. It was very useful.

    I check whether it is possible for the processing that I want to carry out by Lab VIEW program.

    Thank you.

     

    Kunihiko H.