I have a bunch of .c/.h files which make up libraries for different=20
devices.  So in my main code, I can #include "widgit.h".

To allow changing pins around easily I #define WIDGIT_OUT LATC1 in the=20
header file.  Right now I just include copies of the .c/.h in the=20
project and modify the widgit header file to move pins.

I am trying to get to a point where I can store all libraries in one=20
folder and change pins in my main code.  This allows easier source=20
control and sharing of libraries between projects.

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=20
WIDGIT_OUT being an undefined identifier, using #ifndef/#warning in=20
widgit.h also prints the message.

So I'd like to know if:

1) The above should work, but I'm doing something wrong.

2) What ways people use to write reusable code.

David
--=20
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