Switch to embedded-hal 1.0.0

[Rahix]

Not sure when is a good time to do this but it would be great to be an early adopter of the new traits :) They bring a lot of improvements to ergnomics and usability which would help the readability of downstream code a lot.

We do, however, have to consider that most drivers won't have updated yet so we have to be careful as to not become 100% incompatible. Maybe there is a possibility for a compat-shim layer or a cargo-feature to allow using the older version in parallel?

[Rahix]

For reference, some other HALs have gone the route of supporting both the release and alpha versions of embedded-hal at the same time:

https://github.com/lpc-rs/lpc8xx-hal/blob/6e787f8e26d908b3cea13c3c47f04695f4112837/Cargo.toml#L40-L46

If done carefully, I could see this bringing nice benefits. We could have the HAL API look nice because of the alpha traits but still keep compatibility with 'old' drivers through the release version.

[mjhouse]

@Rahix, what's the status on this? I've written a little lcd 16x2 library and I'd like to publish it, but it relies on avr-hal which isn't on crates.io.

EDIT: nevermind- avr-hal-generic has embedded-hal traits for pins.

[stappersg]

For what it is worth, merge request #621 is titled "[arduino-hal] remove embedded-hal-v0 dependency".

[Rahix]

This issue was mostly taken care of in #488 which unfortunately never got linked back here. There were some additional PRs like #517, but I think by now the transition can be considered completed.