David wrote:
> 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".
>=20
> 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.
>=20
> 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.
>=20
> I thought this should work:
>=20
> // In main.c
> #define WIDGIT_OUT LATC1
> #include "widgit.h"
>=20
> // In widgit.h
> #ifndef WIDGIT_OUT
> #warning Output pin not defined!
> #endif
> /* #define WIDGIT_OUT LATC1 <-- Now in main.c */
>=20
> 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.
>=20
> So I'd like to know if:
>=20
> 1) The above should work, but I'm doing something wrong.
>=20
> 2) What ways people use to write reusable code.

That works for compiling main.c (or at least it should), but when you compi=
le
widgit.c, the symbol won't be defined. You need to put the symbol definitio=
n
in another header file that gets included for both compiles.

-- Dave Tweed
--=20
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