Merge pull request #161 from braun-embedded/usart-pins

Clean up `serial` module

Author: korken89

src/gpio.rs

@@ -731,6 +731,10 @@ macro_rules! gpio {
                 }
             )+
         }
+
+        pub use $gpiox::{
+            $($PXi,)*
+        };
     }
 }