RFC on STM32 Ethernet driver

Erwin Rol


I made an initial STM32F4 Ethernet driver. It is based on the HAL
version, and doesn't try to be smart with DMA and packet buffer memory,
it just does memcpy to/from the DMA buffers. But it works.

It can be found at github;

Since it is for the olimex_stm32_e407 board (which is still pending to
be merged) I didn't want to create a pull request yet.

The driver use the STM32 HAL (or at least parts of it), and as I
mentioned "it works" but I am very uncertain about if I like the HAL
thing or not.

For example the ISR uses this __weak callbacks, but you will not have
access to your device structure anymore, and it is very unclear what is
happening. So I pretty much copied the whole ISR to only have the
possibility to access my network device structure passed to the ISR.

With the use of macros like "ETH" naming collisions are bound to happen
sooner or later.

The CamelCase naming convention of the HAL just gives me a headache, but
that's a matter of taste I guess.

I know I am opening a can of worms, but I really could use some guidance
on if using the HAL for more complex drivers like Ethernet is the way to
go or if just making a clean implementation is better.

- Erwin

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