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DAC Exerciser Waveform Generator Format

Samuel Jaffe
Mastermind 25590 points
Other Parts Discussed in Thread: DAC8832, DXP

Hi,

I'm using the DAC8832 Rev A EVM with the DAC Exerciser software to create an arbitrary wave from a file and I think my issue is with the data format.  I'm trying to create an arbitrary waveform with the "Waveform File Converter" but the wave is not showing up.  Here's what I do.

I have a .txt file with binary (00000000,11111111,10010110...).

I go to Utilities - Waveform File Converter and select that .txt file with Delimiter=Comma, File contains=Waveform Points, Data-rate=1.00MSPS, Output Type=Unformatted File (Single-Channel)

Save file as "DAC8832_1.000MSPS_18_Oct_16.tiwu", "File Conversion Complete" - OK

Then I go back and select Waveform Type: User, and I select the file.  Data format is Straight Binary.

I click Run DAC and nothing happens on the output.  It might jump to a value but it doesn't follow the binary.

I've gotten other waves out, just not user.  Somewhere it says there's a sample file in Documents-DXP but I couldn't find it anywhere.  What's the proper format for these .txt files?  And am I doing anything else wrong?

Thanks,

-Sam

  • 0
    TI__Mastermind 46290 points

    Sam,

    It has been some time since the development of DXP, please pardon me as I attempt to recollect how things were implemented. Some of the concerns I have are just with respect to the file name containing "18_Oct_16" as the user comment since the underscore looks  to be used as the delimiter for parsing a tiwu or tiwf file. Have you tried this with a simple file name?

    The other thing I'm not so sure of, but suspect is the case, is that the file waveform points are expected to be decimal. I do not have access to an MMB0 and DAC EVM to test this out myself at the moment, but would suggest giving this a try.

  • 0 in reply to Kevin Duke
    TI__Mastermind 25590 points
    Kevin,

    Thank you for your reply. I've decided to take a different path and measure my data a different way so my issue (though not this issue) is solved.

    As for anyone who's stumbled upon this in the future with the same problem, I'll say the file name was generated by the DXP waveform generator and it put up a fuss when I changed part of it so I kept it as it was.

    And it might be that the file wants decimal, but even then it should have done something at 0, 1, 10, 11, 100... What would really be helpful is a sample file with the format but I'm not sure where we would find it.

    Thanks again for your time,
    -Sam