Embedded-sdhost

[jkristell]

I created, and @richardeoin contributed a lot of code, to a library called sdio-host that implements the split that are discussed in embedded-sdmmc repo in issue. Sdio-host contains code for parsing and creating commands. Right now it is feature complete enough for supporting the stm32f4xx and stm32h7xx hal drivers.

As there seems to be a momentum around creating sd/mmc host drivers right now we should probably move this or another library to embedded-rust-community for discoverability.

When doing this I would also like to rename it to something like embedded-sdhost or embedded-sdhost-support to make it clearer what it actually does.

[jkristell]

Edit:

And recently @mvniekerk created another library mci-rs that also looks like it would do the job :)

[mvniekerk]

O hai!

[thejpster]

I would welcome this coming into REC.