On 27/08/2012 17:13, Wouter van Ooijen wrote:
>> 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?

Yes, widgit.h is also included here.  The header can only be included=20
once with the usual trick of #ifndef _WIDGIT_H ... #endif

I have checked the compile order and main.c comes before widgit.c.

>> 2) What ways people use to write reusable code.
>
> Another trick (that is somewhat compiler-dependent) is to have widgit.h
> include widgit-pins.h, which is in the project directory. This how it is
> done in Jal.

That's a neat idea, I will try this and see if I can get it to work.=20
MPLABX and HiTech (I've not moved to XC8 yet) do some things I need to=20
understand better when you add files from multiple folders into one project=
..

Thanks,

David

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