Add 10M MAC+PHY for the CH32V208 #89
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The CH32V208 has a MAC that's unique to itself, but relatively simple.
I was able to make the demo work on some custom HW of mine.
While this is functional, it's not the 'cleanest' implementation.
Feedback welcome.
This PR depends on ch32-rs/ch32-data#16 for the registers definitions.
Once merged, the dependency yo ch3é-metapac should be updated here.
Note: This is incompatible with the MAC inside the CH32V30x.
While there is no support for the CH32V30x MAC, the basic infrastructure to include the correct ETH driver is present.
Also, the CH32V30x has a MAC that's very close to STM32's 'v1a' so embassy-stm32 should be a good starting point for future work.