embassy Add octospim support for octospi

This PR adds initial support for OCTOSPIM peripheral of octospi. Current implementation just adds OCTOSPIM to octospi, and enables corresponding pins of OCTOSPIM.

Closes https://github.com/embassy-rs/embassy/issues/3097

Jun 21 '24 06:06 HaoboGu

I've tested this PR on stm32h7b0 + w25q64 qspi flash, worked well. But there are still limitations of current implementation:

Current implementation supports OCTOSPI1 only. Different octospim register value should be configured for OCTOSPI1/2, but Ospi struct has no information about it.
In build.rs, I also hardcoded OCTOSPI1 for pin_trait_impl.

Jun 23 '24 11:06 HaoboGu

Did more testing on a rm67162 qspi screen, worked too.

Demo project: https://github.com/HaoboGu/eg-demo

Jun 25 '24 16:06 HaoboGu

Hi @HaoboGu, I managed to use your branch on an stm32h735g-dk to communicate with PSRAM through the hyperbus. However, I had to use OCTOSPI2 because of how the dev kit is wired up so I think it's worth trying to figure out how to support OCTOSPI2 as well. Are you still working on this branch?

Jul 03 '24 14:07 ninjasource

@ninjasource Yeah, OCTOSPI2 is not support now. I had some problems when implementing it for both OCTOSPI1 and OCTOSPI2. For a temporary solution, you can change here and here to make it work for OCTOSPI2

Jul 03 '24 16:07 HaoboGu

I've pushed a commit making it possible to support both OCTOSPI1 and OCTOSPI2. But

Different octospim register value should be configured for OCTOSPI1/2, but Ospi struct has no information about it.

This problem is still there. @Dirbaio Do you have any suggestions on solving it?

Jul 04 '24 02:07 HaoboGu

Added a way to support both OCTOSPI1 and OCTOSPI2

Oct 12 '24 07:10 HaoboGu

This PR can be merged now.

Oct 12 '24 16:10 HaoboGu

Hi @HaoboGu, thanks for your work on octospim. However, I cannot find any examples I can test and your eg-demo linked above is a broken link. Do you have any examples for us to look at?

Oct 15 '24 16:10 ninjasource

Hi @HaoboGu, thanks for your work on octospim. However, I cannot find any examples I can test and your eg-demo linked above is a broken link. Do you have any examples for us to look at?

Hey @ninjasource I just made the project public

Oct 15 '24 17:10 HaoboGu

Hi @HaoboGu, thanks for your work on octospim. However, I cannot find any examples I can test and your eg-demo linked above is a broken link. Do you have any examples for us to look at?

Hey @ninjasource I just made the project public

Thanks!

I have raised an issue I encountered in your repo so as not to add noise to this closed repo.

Oct 15 '24 17:10 ninjasource