defs.h

[guest]

When a register is in a #define instruction in header.h file, may I define the same register with another name in my program (with #define instruction) and use the two labels as I want?

Thank you

[Ttelmah]

Yes.
The '#define', is effectively a macro expansion. If you have:

#define fred (12345)

Then when the word 'fred' is seen in the code, '(12345)' is substituted. There is nothing at all to stop you having 'fred', and 'harry', both defining the same thing. You can even be 'evil', and have something defining another define, so:

#define harry fred
#define fred (12345)

Then if you type:

value=harry, value will be set to 12345.

However you must be very carefull about the _order_ of the declarations. They are executed 'as met', so as shown, 'harry' gets replaced with 'fred', and then 'fred' gets replaced with '(12345)'. However if the declarations are the other way round, 'harry' will be replaced with the text 'fred', and not the numeric value...

Best Wishes