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DXP Source VI

Kevin Tarrant
Prodigy 20 points
Other Parts Discussed in Thread: DAC9881, DXP

Hello,

I am using a DAC9881 with the MMB0 evaluation board. I am trying to test the DAC to see if it is appropriate for a specific application, and I wanted to modify the DXP application (or make a new VI with the plugins) to make a more contextually appropriate application. Could you provide the source VI/code for the DXP application?

Thanks,

KT

  • 0
    TI__Guru**** 181511 points

    Hi Kevin,

    Welcome to the e2e Forum!  Can you tell us a little more about what exactly it is that you want to do with the DAC9881?  The waveform generation is not actually in the LabView VI or DXP itself, it is actually done on the DSP that is on the base board (the MMB0).  The source for the MMB0 was compiled using Code Composer Studio which essentially sends a look-up table down to the TMS320VC5509 DSP on the board.  The VI simply manipulates the way the data is transferred to the DAC9881 and some GPIO functionality.

  • 0 in reply to Tom Hendrick
    Prodigy 20 points

    Hello Tom,

    The DAC is being run in bipolar mode. We want a simple interface where we can choose a voltage -5 to 5V and that is what comes out of the DAC. DXP provides this functionality, but we want it to list -5V to 5V and scale it correctly for us to get the desired output.

  • 0 in reply to Kevin Tarrant
    TI__Guru**** 181511 points

    Hi Kevin -

    OK - thanks for the added detail!  I'll see what we can do...

  • 0 in reply to Kevin Tarrant
    TI__Mastermind 43915 points

    Hi Kevin,

    Sorry for the delay as a lot of us have been on vacation the last week.

    I edited the .ini file that DXP uses to set the DAC parameters when evaluating the DAC EVM and attached it to this post. Place the file in folder located at C:\Program Files\DXP\Devices

    You can go in and edit the

    +FS=5.00
    -FS=-5.00

    parameters in the .ini file to adjust the scale as you would like. I am not sure if this fully solves what you are trying to do or not. Let me know what other questions that you may have.

    Regards,

    Tony Calabria

    dac8881Bipolar.ini