DXP Source VI

Kevin Tarrant

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,

over 14 years ago

0 Tom Hendrick over 14 years ago

TI__Guru**** 182601 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 Kevin Tarrant over 14 years ago 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 Tom Hendrick over 14 years ago in reply to Kevin Tarrant

TI__Guru**** 182601 points

Hi Kevin -

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

0 Tony Calabria over 14 years ago 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

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DXP Source VI