stm32/i2c: slave mode support

[Dirbaio]

No description provided.

[jrmoulton]

I'm interested in implementing stm32 i2c slave mode. I see there was a PR opened a while ago in #2118 but that there were some changes that needed to be made and the PR was marked as a draft. Would it be better to use that PR as a starting point or start from scratch and use the rp implementation as a reference?

[bsodmike]

Any update on this? Cc @Dirbaio

[jrmoulton]

I've started implementing it but haven't finished. Will probably get back around to it in a few weeks

[jrmoulton]

@bsodmike I have a draft PR open in #2909

Not quite finished but will likely be finished soon

[barafael]

@Dirbaio looks like this is implemented meanwhile and can be closed

[bsodmike]

Agreed, this issue can be closed as the PR should be merged soon post CI failures