NEWAPI.txt

-type unsigned() :: non_neg_integer().
-type posix() :: atom().

-spec gpio:init(Pin :: unsigned()) -> ok | {error,Reason::posix()}.
-spec gpio:set(Pin :: unsigned())  -> ok | {error,Reason::posix()}.
-spec gpio:clr(Pin :: unsigned())  -> ok | {error,Reason::posix()}.
-spec gpio:get(Pin) -> boolean().

-spec gpio:input(Pin) -> ok | {error,Reason::posix()}
-spec gpio:output(Pin) -> ok | {error,Reason::posix()}

%% extended api

-spec gpio:set_pin(Pin, Level::boolean()) -> ok | {error,Reason::posix()}.
-spec gpio:set_mask(Mask :: unsigned()) -> ok | {error,Reason::posix()}.
-spec gpio:clr_mask(Mask :: unsigned()) -> ok | {error,Reason::posix()}.
-spec gpio:set_mask(Set::unsigned(), Mask :: unsigned()) ->
			        ok | {error,Reason::posix()}.
-spec gpio:clr_mask(Set::unsigned(), Mask :: unsigned()) ->
			       ok | {error,Reason::posix()}.