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stmhal: Add DMA support for sdcard #1625

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stmhal: Add DMA support for sdcard #1625

wants to merge 3 commits into from

Commits on Nov 16, 2015

  1. stmhal: Put IRQs into priority order. 

    - added some comments to explain the priority/sub-priority.
- adds an entry for SDIO (to be used in a later patch)
- increases DMA priority above USB so that DMA can be used
  for sdcard I/O when using USB Mass Storage.
    @dhylands
    dhylands committed Nov 16, 2015
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  2. stmhal: Turn off DMA clocks when idle for 100 msec 

    Turning on each DMA block increases the current consumption
by about 8 mA. This code adds an idle timer for each DMA
block and turns off the clocks when no streams are in use
for 128 msec. Having a small timeout allows for improved
performance when back-to-back transfers are being performed.

The 128 msec is basically a guess.
    @dhylands
    dhylands committed Nov 16, 2015
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  3. stmhal: Add dma support for sdcard. 

    This started out using IgorLektorovEpam work in PR micropython#1389
and reworked it.
    @dhylands
    dhylands committed Nov 16, 2015
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