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DAC81404EVM: Changing the clock

Cameron Perl
Expert 4270 points
Part Number: DAC81404EVM
Other Parts Discussed in Thread: DAC81404, ENERGIA

Hi team,

Is it possible to change the clock speed of the DAC81404 through the GUI from 1MHz (seemingly default) to 25 or 50MHz?

Thanks,

Cam

  • 0
    TI__Mastermind 28828 points

    Hi Cam,

    This GUI was developed using GUI composer and I am not aware of a way for us to modify the clock speed used for the SPI communication. As far as I know, it is predetermined by GUI composer and we only have control over the interface type and the register map. However, you can use CCS to talk to the MSP Launchpad directly and you would have more control over the SPI setup. 

    You can easily use Energia through CCS cloud (dev.ti.com). Energia is very similar to Arduino and I believe there are starter projects available when you go to create a new project. 

    Best,

    Katlynne Jones 

  • 0
    TI__Guru 53183 points

    Hi Cameron,

    It is not possible to change the clock rate within the GUI.  If you or your customer are planning on creating a custom firmware image for the MSP432, then it could be modified.  Note that the Launchpad format is not very conducive to fast clock transients (due to the mating headers), so you might have some signal integrity issues when you use very high rates like 50MHz.

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    TI__Expert 4270 points

    Hi Paul, Katlynne,

    Thanks for the quick replies!

    Anything specific files or material needed to modify the firmware image? I also appreciate the note regarding the fast transients.

    Cheers,

    Cam

  • 0 in reply to Cameron Perl
    TI__Expert 4270 points

    Perhaps the source-code or project that was used for the binary they shipped with? 

  • 0 in reply to Cameron Perl
    TI__Guru 53183 points

    Hi Cameron,

    The default source code/binary is loaded with lost of hooks that allow the web-based interface to work.  It is generally not a good starting point for device evaluation.  I will check with the team to see if they have any example programs for the DAC81404.

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    TI__Expert 4270 points

    Thank you for your help Paul - we just need a starting point to modify the clocking of the device. I have my DFA pulled in who can assist as well once we have a starting point.

  • 0 in reply to Cameron Perl
    TI__Guru 53183 points

    Let me confirm with my team.

  • +1 in reply to Paul_Frost
    TI__Mastermind 28828 points

    Hi Cameron,

    Someone on our team did have this DAC81404 CCS/Energia example for the Tiva series launchpads. The implementation will be very similar to the msp430-EXP432E401Y launchpad. 

    DAC81404_Tiva.zip

    Alternatively, you can use any other SPI controller that you may have. As Paul mentioned, the launchpad headers might not be ideal for 50MHz speeds. 

    Best,

    Katlynne