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A DMA-driven driver differs from an interrupt-driven one in that the processor is involved

  • A.once per item
  • B.only when the transfer fails
  • C.once per buffer rather than once per item
  • D.not at all

Answer: C

The controller moves every byte and raises one interrupt when the block is done, so a thousand samples cost one handler entry rather than a thousand. Setting up the descriptor and handling the completion are what remain for the processor.

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