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Thread: UART and GPDMA

  1. #21
    Advanced Advanced Zain is on a distinguished road
    Join Date
    Jun 2013

    Not sure whether you can use "Linked list multi-block transfer with auto-reload DAR"? There is a simple start "XMC_HOT: XMC4500:How to do Multi BLK DMA transfer (SRC Linked list n DST contiguous)?"


  2. #22
    Quote Originally Posted by haakonsbakken View Post
    Hello Jesus,

    Well, yes. CH_SUSP does suspend a DMA channel. And, I finally found a way to solve this which involves suspending each channel until none are running, then disable the DMA IRQ (otherwise the interrupt is immediately active as there are no data to transfer, causing no other code to be reached). To be able to restart the whole thing I also need to disable the DMA channels (CHENREG), set the DAR, reset CH_SUSP, reenable DMA channels (CHENREG, MASKBLOCK, CLEARBLOCK), clear pending DMA IRQs and reenable DMA IRQ. In addition, support has suggested stopping and restarting the VADC groups as part of this procedure. Phew!

    Thanks, anyway.
    /Åse Maj

    seems to work. When "everything is down" you can change the Destination address.

  3. #23

    New Question:

    Szenario: I've got an text to put out of UART. The length is variable and >64B. The solution is GPDMA Transfer with Software Handshaking?! Is there another way to success?
    Someone got a little example code for Software Handshaking DMA->UART?

    All the examples I can find use Hardware Handshaking and a fixed Output length.

  4. #24
    Beginner Beginner olnol is on a distinguished road
    Join Date
    Nov 2014
    I am also interesting in some example code regarding the question above? Please could anyone help?

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