Macro circuit_playground_express::define_pins

macro_rules! define_pins {
    (
$ ( # [ $ topattr : meta ] ) * struct $ Type : ident , target_device : $
target_device : ident , $ (
$ ( # [ $ attr : meta ] ) * pin $ name : ident = $ pin_ident : ident ) , + , ) => { ... };
}

This macro is a helper for defining a Pins type in a board support crate. This type is used to provide more meaningful aliases for the various GPIO pins for a given board.