DMA API

[hargoniX]

During today's embedded WG meeting James mentioned that:

If you see anyone working on DMA stuff, ping them and see if they could move their work over to the new APIs :)

Referring to these https://github.com/ra-kete/dma-poc APIs.

So @Jan561 should maybe try and look into directing his efforts towards getting DMA running towards these APIs, if enough succesul implementations show up they might be added to embedded-hal soon ™️ which would be a big plus embedded Rust.

[mtthw-meyer]

I except I'll end up with an implementation of DMA for #90.

[hargoniX]

Since embedded-dma has been taken over by the embedded wg the new way to go is going to be to implement that!

[mtthw-meyer]

Ok. Is there a issue I can track for that?

[richardeoin]

Yup! This is led by the working group, so you need to look there rust-embedded/wg#486

[ryan-summers]

embedded-dma is now officially supported by the HAL team, so I think it would be safe to use. I have a project that's looking to use memory -> peripheral for QSPI transactions, so I may have some time to devote to this.

[mtthw-meyer]

Nice. Having a working use case would make it easier to implement for SAI.

[richardeoin]

Agreed! A small dma module was merged as part of #99, but I think that can just be overwritten with an embedded-dma implementation.

[mtthw-meyer]

Yeah, that was me taking a stab at getting some basic DMA stuff in. I was originally going to support DMA in the SAI implementation but it proved to be too much at once.

[antoinevg]

I also mentioned this on #153 but for reference here's a link to my proof-of-concept example using the SAI peripheral with DMA:

https://github.com/antoinevg/stm32h7xx-hal/blob/sai-dma/examples/sai-dma-passthru.rs

[richardeoin]

Closed by #153