On October 16, 2005 10:52 pm, scott larson wrote:
> hi,
> i'm not very experienced with assembler directives, so i don't know
> if this is achievable.
> i have an asm program that has many subroutines, each lights a
> different letter on a 5x7 LED display. In my main program, i call
> whatever subroutine I want, for example, to display "HELLO" :
>  start
> call HHH ; light up H
> call Pause;
> call EEE; light up E
> call Pause;
> call LLL; light up L
> call Pause;
>  call LLL; light up L
> call Pause;
> call OOO; light up O
> call Pause;
> goto start
>  i have programmed the whole alphabet and other characters, but they
> do not all fit on the PIC.
> what i want to do is program only the ones that get called, and have
> the assembler ignore the rest.
>  i have been looking at #DEFINE, IFDEF, and IF statements, but i
> can't seem to figure this out.
>  can somebody point me in the right direction?
>  i'm using MPLAB.

create a small asm program with this in it:

#define EXAMPLE 1

#ifdef EXAMPLE
  #define HI 1
  #define LO 0
#else
  #define HI 0
  #define LO 1
#endif

#ifndef EXAMPLE
 #define X 1
 #define Y 2
#else
 #define X 3
 #define Y 4
#endif

in the code section, insert this:
	retlw HI
	retlw	 LO
	retlw X
	retlw Y
you can also insert this in the code section:
	#ifdef EXAMPLE
	movlw	5
	movlw	HI
	#else
	movlw	10
	movlw	HI+Y
	#endif
try the above with and without "#define EXAMPLE"
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist