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Mike Hooper
Mike Hooper
Associate III
July 28, 2017
Solved

Is DMA Double Buffer Mode only Peripheral to Memory?

  • July 28, 2017
  • 5 replies
  • 1284 views
Posted on July 28, 2017 at 14:40

It appears from the (rather lacking) documentation that the DMA Double Buffer Mode is only a Peripheral to Memory transaction. Is this correct? Or can I use double buffering from memory to peripheral?

    This topic has been closed for replies.
    Best answer by waclawek.jan
    Posted on July 29, 2017 at 10:13

    Please specify, which part are you using.

    AFAIK, the single-port DMA (F1/F0/L1/L4/L0) does not feature double-buffer mode.

    I am trying to find a RM with the 'F2/'F4/'F7-style double/triple-port DMA, where textual search for ''double'' would not stumble upon several mentions of both direction being available, including the following table:

    0690X00000607gxQAA.png

    JW

    PS. Amel, RM0090 of 'F0xx, RM0360 of 'F030 and possibly others contain a mention of ''double buffer mode'' in the ADC chapter, which probably ought to be removed.

    5 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    July 28, 2017
    Posted on July 28, 2017 at 15:07

    On what part?

    I'd assume the implementation will be highly symmetrical. The mechanics are there to ping-pong between two buffers whether the transfer is to or from is a separate and independent step in the sequence.

    Not single memory to multiple peripherals.

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    Amel NASRI
    Amel NASRI
    ST Technical Moderator
    July 28, 2017
    Posted on July 28, 2017 at 19:01

    Hi

    Hooper.Mike

    ‌,

    In

    http://www.st.com/content/ccc/resource/technical/document/application_note/27/46/7c/ea/2d/91/40/a9/DM00046pdf/files/DM00046pdf/jcr:content/translations/en.DM00046pdf

    we say 'A double-buffer stream works as a regular (single-buffer) stream, with the difference that it has two memory pointers. '

    So both directions can be used.

    -Amel

    To give better visibility on the answered topics, please click on "Best Answer" on the reply which solved your issue or answered your question.
    waclawek.jan
    waclawek.janBest answer
    Super User
    July 29, 2017
    Posted on July 29, 2017 at 10:13

    Please specify, which part are you using.

    AFAIK, the single-port DMA (F1/F0/L1/L4/L0) does not feature double-buffer mode.

    I am trying to find a RM with the 'F2/'F4/'F7-style double/triple-port DMA, where textual search for ''double'' would not stumble upon several mentions of both direction being available, including the following table:

    0690X00000607gxQAA.png

    JW

    PS. Amel, RM0090 of 'F0xx, RM0360 of 'F030 and possibly others contain a mention of ''double buffer mode'' in the ADC chapter, which probably ought to be removed.

    Amel NASRI
    Amel NASRI
    ST Technical Moderator
    July 30, 2017
    Posted on July 30, 2017 at 01:16

    Ok

    Waclawek.Jan

    ‌, I'll take care to check this.

    -Amel

    To give better visibility on the answered topics, please click on "Best Answer" on the reply which solved your issue or answered your question.
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