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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Nios II Uart with DMA

In my Nios II system I want to use Uart with DMA. Are there some tutorials or example projects about this topic.

I'm using Quartus 13.0.

Thanks.

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    9 years ago

    It doesn't really make sense to use DMA with a UART. A DMA engine doesn't have a mechanism to stop sending and wait for characters to go out, or wait for input characters to be present before transferring data. The FIFO in a standard UART is so small that the time taken to set up a DMA transfer would be greater than the time to fill the FIFO with a sofware loop.

    • praveenkumar's avatar
      praveenkumar
      Icon for Occasional Contributor rankOccasional Contributor
      5 years ago

      can u help me receiving 24 bytes with uart @2mbps speed.

      i tried but it was receiving like first byte at last and last byte at first like that.

      how can i overcome this problem