Dale,

So do I need to use #byte port_b=6  and  #use fast IO(port_b) at the top of the program and then after the set_tris_b(0); type in port_b=value in the main program?

Dean Matthews

-----Original Message-----
From: Dale Botkin [mailto:dale@BOTKIN.ORG]
Sent: 06 November 2001 17:00
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]:help using CCS C code


On Tue, 6 Nov 2001, D Lloyd wrote:

> Is it not because of the upper case "P"/also? Presumably (uh-oh, out rolls
> the "presumably"), the compiler knows about "port_b" because it is used in
> the "#use fast_IO"  but knows zippo about the "Port_b".

Nope, CCS is case insensitive by default, so that's most likely not the
problem.  And oddly enough, though port_b is used in the preprocessor
directive #use fast_io, it's not actually defined in th sense that you can
use it as a variable.  And I think there's a reason for that:  I may want
to define port_b as a variable, which is treated like any other variable
and can be stored anywhere in RAM.  I may instead want to use the #byte
directive to specify *where* in memory port_b is located.  So in this case
port_b is local to the #use fast_io preprocessor directive.  Confusing
enough?  8-)

Dale

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