Bob Ammerman wrote:
> 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.

Check out my /INBIT and /OUTBIT preprocessor directives.  See the PREPIC
documentation file at http://www.embedinc.com/pic.  You write a
declaration in the project include file like this:

/outbit  fire_torpedoes portb 3 0

This automatically (in my standard PORT module) causes RB3 to be set as an
output, in this case initialized low (last parameter).  It also defines
FIRE_TORPEDOES_REG, FIRE_TORPEDOES_TRIS, FIRE_TORPEDOES_BIT, and
FIRE_TORPEDOES_PIN.  You can write code like:

    dbankif  fire_torpedoes_reg ;set banks
    bsf      fire_torpedoes_pin ;bombs away

or:

    dbankif  shadow   ;set banks for access to shadow reg
    bsf      shadow, fire_torpedoes_bit ;set shadow reg bit
    movf     shadow, w ;get new port register value
    dbankif  fire_torpedoes_reg ;set banks for port reg access
    movwf    fire_torpedoes_reg ;bombs away

I haven't yet added support for the 18 family LAT registers, but will Real
Soon Now (tm).


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