> I thought this should work:
>
> // In main.c
> #define WIDGIT_OUT LATC1
> #include "widgit.h"
>
> // In widgit.h
> #ifndef WIDGIT_OUT
> #warning Output pin not defined!
> #endif
> /* #define WIDGIT_OUT LATC1 <-- Now in main.c */
>
> But it appears that this doesn't work.  I get errors from widgit.c about
> WIDGIT_OUT being an undefined identifier, using #ifndef/#warning in
> widgit.h also prints the message.

This approach should work. Did you include widgit.h in widgit.c?

> 2) What ways people use to write reusable code.

Another trick (that is somewhat compiler-dependent) is to have widgit.h=20
include widgit-pins.h, which is in the project directory. This how it is=20
done in Jal.

This configuration problem is one of the reasons I like using C++, where=20
I can create a pin class, and pass objects to the widget constructor.

--=20

Wouter van Ooijen

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--=20
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