John De Villiers wrote:

> I need help with MPLAB.
>
> Im busy with a cicuit design and at the same time im writing the code for
> it. With some of the i/o lines i havent decided on what ports they should go
> yet.
>
> At the moment my code looks something to the effect of
>
>         bsf     porta,0
>         bcf     porta,1
>
> Is there a way i can define names for porta,0 and porta,1 so that in the
> code i can use the names, instead of the pin names?

Sure!

Declare constants for the pin numbers.

Plug1    EQU    0
Plug2    EQU    1
Plug3    EQU    2
etc....
Then you code can be:

    BSF    PORTA,Plug1
    BCF    PORTA,Plug2

> Then if i move something
> around, all i need to do is change the name -> pin assignment and recompile,
> instead of searching all the code for porta,0 etc.
>
> Regards
>    John
>
> PS - does anyone know off-hand what the length (time) of a spark is in a
> vehicle with electronic ignition ?

--
Thomas C. Sefranek  WA1RHP
ARRL Instructor, Technical Specialist, VE Contact.
http://www.harvardrepeater.org
http://hamradio.cmcorp.com/inventory/Inventory.html