Move heavylifting to the user, relief us from updating over 40k files

[michalfita]

As suggested by @tmplt in #21, this is about harnessing power of build.rs to manage PAC crates.

[michalfita]

@tmplt I have good news: I've hacked my way to get PAC crate where build.rs handles generation via svd2rust. Some long standing unresolved problems in Rust itself stand in opposition to do it in a clean way, but in overall this works with some tradeoffs:

• All attributes have to be in the static src/lib.rs, so cannot be generated by the tool; there's flag controlling this, so not a big deal apart keeping eye if that changes in the future.
• Regardless of the flag svd2rust leaves #![doc = ...] attribute in the generated ${OUT}/lib.rs what causes error on inclusion; the workaround is to filter that out from the output, what's memory inefficient.

I'll work on this more and PR some draft, but for now I need to move back to issues that require closing ASAP.

[michalfita]

It took some time, but most things seem to be in place. I've published some alpha releases, if anyone is willing to test using them from crates.io. FYI @tmplt

BTW. I've noticed atsam-rs now publish PACs for SAME70 with -pac suffix. I wonder if that competition makes any sense.

[tmplt]

On 02/20/2023 22:33, Michał Fita wrote: It took some time, but most things seem to be in place. I've published some alpha releases <https://crates.io/crates/atsame70n19b/0.28.0-alpha0>, if anyone is willing to test using them from crates.io. FYI @tmplt <https://github.com/tmplt>

I'll take a look once a PR is ready.

BTW. I've noticed |atsam-rs| now publish PACs for SAME70 with |-pac| suffix. I wonder if that competition makes any sense.

Looks like a side-effect of other PAC generation.

[michalfita]

Looks like a side-effect of other PAC generation.

They responded to my request.

I'll take a look once a PR is ready.

That's going to be separate repository (actually is, but not publicized yet).

[michalfita]

This is addressed in atsamx7x-pac repository and issue #56 / PR #61.