Add atmega328pb as a extension to atmega328p

[jkristell]

I think it makes sense to make atmega328pb a "feature" of atmega328p. And it looks okayish this way. We could tweak the the device a bit so that the first i2c and spi device doesn't have a 0-suffix so that the second device would just be an addition, like for the Usart.

Remarks and questions

• This depends on the Spi macro fix in Remove type defines #95
• And I noticed I have a couple of todos left in the timer setup I need to take a look at.
• Is there a clever way to select just one of the devices from avr-device?

[jkristell]

As always, Only compile tested :-)

[Rahix]

Looks good now! Thanks for working on this!

[jkristell]

Did a rebase to clean up the history. I think this could be merged now. Thanks for all your patience with this unexpectedly complicated add of a device :)

[Rahix]

Did a rebase to clean up the history.

Much appreciated! I've given up asking people to do it by now ...

[jkristell]

Thanks for the merge. Github should add the squash feature that gitlab has, that's really handy.

Also want you to know that this is actually tested on hardware now, and the things I tested so far works great. You have done a fantastic job with all of the avr-crates. Thanks!