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DMA abort #722

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9ary opened this issue Nov 16, 2023 · 0 comments · Fixed by #803

Contributor

9ary commented Nov 16, 2023 •

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I'm implementing an SPI-like slave for a project, and I would like to be able to abort the DMA transfer if CS is de-asserted before completion.

Currently it looks like the HAL doesn't implement this feature at all.

Reading section 2.5.5.3. Channel Abort of the datasheet, the sequence is fairly simple (including the errata workarounds):

save and disable the channel's IRQ
set the corresponding bit in the CHAN_ABORT register
poll the busy flag until it clears
clear the spurious interrupt
restore the channel's IRQ enable

I'll probably PR this, just opening a tracking issue for now.

EliseZeroTwo mentioned this issue

Add support for aborting DMA transfers #803

Merged

jannic closed this as completed in #803

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