At 12:51 PM 5/16/97 +0100, you wrote:
>hi all,
>
>a couple of quick questions...
>
>1> when i use 'retlw TRUE/FALSE'- how does one commonly check
>        what happened after the return? do you check the LSB of W
>        i.e. btfss      W,0

Does that even assemble?

I use
        call    routine
        xorlw   FALSE
        btfss   Z
        goto    WasTrue
WasFalse
        ...

WasTrue
        ...

routine
        ...
        retlw   FALSE
        ...
        retlw   TRUE

Another way I've done it is to have:

FLAGS   ds      1
RETFLG  equ     FLAGS.0

        call    routine
        btfsc   RETFLG
        goto    WasTrue
WasFalse
        ...

WasTrue
        ...

routine
        bcf     RETFLG          ; Default to FALSE
        ...
        ...
        return                  ; No change if false return needed
        ...
        bsf     RETFLG          ; Flag TRUE state
        return

This costs a little, but makes coding simpler sometimes.  Multiple routines
can use RETFLG, just so long as you keep track of who owns it at any
particular time.


> now i'm getting into a mess trying to keep track of where i put
> which CBLOCK- i.e. either i have to define the CBLOCK in bank1
> last, or i have to give an address to the next CBLOCK- which i
> don't want to calculate...
>
> what's usually done in these cases?

I would use a different assembler, that doesn't support CBLOCKs.

Andy

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Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
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