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TM4C1294XL dma gpio trigger

Huseyin Buyukesmeli2
Prodigy 120 points

Hi All,

I am very new to DMA and I want to use uDMA to read from GPIO with rising edge of an other GPIO. For example at every rising edge of PD2 i want to write PK(0-7) to a RAM address. All examples that I encountered, trigger the DMA channel with software. But I couldn't able to trigger with GPIO.

Thanks for your help.

huseyin

  • 0
    TI__Guru**** 244380 points

    Hello Huseyin,

    To use the GPIO as a DMA Trigger, you need to first select the edge of the GPIO that you have to trigger on and then enable the DMA capability for the pin in the GPIODMAEN register.

    Just like the other examples the uDMA structure needs to be initialized and the only difference now is that instead of using software dma trigger use the uDMAChannelAssign(...) with the Macro value mentioning the GPIO and DMA Channel as given in udma.h

    Regards

    Amit

  • 0 in reply to Amit Ashara
    Guru 20670 points

    For a example for DMA GPIO trigger, check:

    https://sites.google.com/site/luiselectronicprojects/tutorials/tiva-tutorials/tiva-dma

  • 0 in reply to Luis Afonso
    Prodigy 120 points

    Luis,

    "Understanding dma part" of the site  was my starting point. But I missed the GPIO example. Thanks again. It seemed very confusing at first sight I managed to trigger dma. 

    Amit,

    You are like super-hero, thank you.

    huseyin