I'd like to see a syntax something like this:


portb = ...whatever the address is...

    bitmap    portb
        B0
        B1
        ...
        B6
        B7
    endb

fire_torpedoes = B7

    bsf    B3
    bsf    fire_torpedoes

    bsf    shadow.b3
    bsf    shadow.fire_torpedoes

The bitmap symbols would be stored in the symbol table as both a file
address and a bit number, along with an indication that it was a bitmap
symbol.

The syntax shadow.b3 would replace the file address with that of 'shadow'.

The only places these symbols could be used is:

1: with or without 'shadow.' as the only argument to BSF/BCF/BTFSS/BTFSC

2: without 'shadow.' as arguments to builtin functions:

    bitnum(b7)
    fileaddr(b6)
    bitmask(b3)

3: with or without 'shadow.' as a value to be assigned to another symbol,
which will then also be marked as a bitmap symbol.

shadow_fire = shadow.fire_torpedoes

Bob Ammerman
RAm Systems



----- Original Message -----
From: "Alan B. Pearce" <A.B.Pearce@RL.AC.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, April 02, 2003 5:34 AM
Subject: Re: [PIC]: Configuration bits


> >Also, while it would be nice to have some sort of type checking
> >on bit number symbols, let's no loose sight of the fact that
> >these kinds of errors are quite rare.  I've written tens of
> >thousands of lines of PIC assembler of dozens of projects, and I
> >have no recollection of ever using a named bit with the wrong
> >special function register.
>
> I have not managed to make that mistake yet either, but in the process of
> debugging a portion, some reasonable time after writing it, and having
been
> sidetracked into other hardware issues, have been through the loop of
being
> certain I have the correct bit name, but not sure if the register is
really
> the correct one, and had to double check to make sure.
>
> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
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>

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