Subvariants

[strom-und-spiele]

Acts on the discussions in #67

[strom-und-spiele]

Travis fails b.c. it's running rustc […] --cfg 'feature="stm32f303"' which is what this PR is about…

[Sh3Rm4n]

As this is a breaking change (users which use the stm32f303 feature would not be able to compile there project anymore) I would introduce this change more gracefully.
I would like to see the use of th e deprecated attribute. I don't know how to apply it on features, though.

My thought is, that we have to give the user some time. So introduce a deprecation note in v0.5.0 and remove the features in v0.6.0. This would prevent the breaking of the code for users, which blindly update to v0.5.0 and give them some time to adjust there code.

[Sh3Rm4n]

I really like the graphic included in the summary from stm (middle of the page)

I would not include this image in the README, but maybe an explanation about the code?

There is a perfect graphic in the datasheet (page 142 section 8) Not every information is relevant.

But on this part, I'm currently a bit confused. The Flash memory size letter is the one, which is referenced in the reference manual, on which distinction are made, which we replicate in the crate currently.

But I would think that the pin count [C, R, V] does determine how many gpio banks are available. I've to think about this part a little bit more.

[strom-und-spiele]

There is a perfect graphic in the datasheet (page 142 section 8)[…]
But on this part, I'm currently a bit confused. The Flash memory size letter is the one, which is referenced in the reference manual, on which distinction are made, which we replicate in the crate currently.

This list does not seem to be exhaustive. It only helps you specifying the STM32F303x[BCDE] type of chips.
As far as I was involved, we discriminated between stm32f303x[BCDE] and stm32f303x[68].

[Sh3Rm4n]

I really like your description / documentation of the avaliabe features and how to choose them. I think this will greatly help newcomers.

So here is the (hopfully last) request for changes! :)

Thanks for your great work.

[Sh3Rm4n]

Thank you for this PR! :)

[strom-und-spiele]

Should have "fixed" #81 by disallowing to select stm32f303