Commits on Nov 2, 2020

1. Clean up the way USART pins are defined …

   Replaces the combinatorial explosion of the previous pin macro with a
   more targeted approach. The new macro implements one trait for each kind
   of pin. The `Pins` trait is then implemented using blanked
   implementations using the pin-traits.

   

   hannobraun committed Nov 2, 2020
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2. Simplify use statements in serial

   

   hannobraun committed Nov 2, 2020
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3. Re-export pin types from gpio …

   Now pins can be accessed using, for example, `crate::gpio::PA1` instead
   of `crate::gpio::gpioa::PA1`. The names are already unambigous, and not
   only can this make all imports slighly more convenient, it can also help
   cut down a lot on use statements required for macro-generated code.

   

   hannobraun committed Nov 2, 2020
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4. Further simplify use statements in serial

   

   hannobraun committed Nov 2, 2020
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5. Further simplify use statements in serial

   

   hannobraun committed Nov 2, 2020
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