Porting to G0x1

[dzarda]

I reckon the upcoming G0C1/G0B1 ought to be successful. We should add support for their USB cell.

They call it USB full-speed host/device interface, and it appears that they extended the existing dev/fs with backwards compatibility. Host bits seem to be a simple addition in register description, occupying the high halfword. (We should probably ignore the host functionality...?)

G4 map for comparison:

One notable change is the 32-bit PMA access:

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Which of our implementation files would be an appropriate starting point?

Cheers

[dmitrystu]

I think it's close to L052. Unfortunately, there is no proper G0 on the local suppliers stock.

[dzarda]

Yeah patient we must be

[dzarda]

Mouser has a few pieces stocked.

[ghent360]

G0s a widely available now, you can get several nucleo G0 kits from mouser.

[GrantMTG]

That's good news!

[ghent360]

The PMA on the G0 is 32-bit access only. The rest is more or less the same with some reg names changed.

Created PR #123.