• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 82 subscribers
  • Views 122 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMS320F28379D: DMA write to EALLOW protected register

Richard Spießberger
Prodigy 10 points

Part Number: TMS320F28379D

Hello,

is it possible to write to EALLOW protected registers using DMA? Specifically, I want to write to the Sdfm2Regs.SDDFPARM1.all register, which does not work at the moment. 

Best regards,
Richard

 

  • +1
    TI__Mastermind 24060 points

    Hi Richard,

    No, DMA writes are blocked by EALLOW protections to my knowledge. The DMA cannot write EALLOW protected registers unless EALLOW is called (enabling access). This is a bug we have recently discovered on a newer device. Can you try calling EALLOW before the DMA transfer and see if it works? Note that some driverlib functions call EALLOW & EDIS inside, so if your application calls any of these functions, you will need to call EALLOW after. 

    Best Regards,

    Delaney

  • 0 in reply to Delaney Woodward
    Prodigy 10 points

    Hi Delaney,

    thank you for your answer!

    It seems that this bug also exists for the F28379D because the DMA write works when EALLOW is active.

    Best regards,
    Richard