Create a etherbone+litex rust library

[mithro]

It would be nice if the etherbone+litex functionality in wishbone tool was extracted into a library (crate?) that other tools could build on the top of.

Functionality which makes sense to me;

• Reading & Writing to wishbone busses
• Reading & Writing to LiteX CSR registers, including loading the CSR names and info from .csv or .json files.
• Setting up triggers, watching the triggering and reading the data from LiteScope.

[mithro]

@xobs - What do you think?

[xobs]

That does make sense.

The basic wishbone peek/poke functionality should be pulled out into its own crate. This will also require separating configuration data out -- right now config is one big giant struct that individual bridges refer to.

[xobs]

We now have a new crate called wishbone-bridge that is documented on docs.rs. This supports the first point.

Is there a specification for how a .json file looks? Right now the csr.csv parsing is mostly hand-rolled in https://docs.rs/wishbone-bridge/1.0.0/wishbone_bridge/ and I think it could be improved. Support for json could be added at the same time.

For LiteScope support, I'd need to know what triggers look like.

[mithro]

@xobs - Maybe we should create https://json-schema.org/ for the csr.json file or something?