gnupic: gpasm: res and equates and bitfields
Subject:
RE: gpasm: res and equates and bitfields
From:
Craig Franklin ####@####.####
Date:
27 Mar 2004 01:41:50 +0000
Message-Id: <1080351676.2145.1.camel@r2d2>
On Fri, 2004-03-26 at 08:30, Scott Dattalo wrote:
> (ps. you're qmail setup doesn't properly demarcate your replies from the
> quoted text.)
>
> On the discussion of an alternative way for abstractly accessing
> bitfields, scx31114 wrote:
>
> > Try this
> >
> > bitfield0 res 1
> > bitfield1 res 1
> >
> > _bit0 EQU 0
> > _bit1 EQU 1
> > _bit2 EQU 2
> > ....
> > _bit12 EQU 12
> >
> > to access the byte
> > bitfield#v( (_bitN ) /8 )
> >
> > _bitN = _bit0 - _bit999
> >
> > to access the bit
> > (_bitN%8)
> > or
> > (_bitN&7)
>
> Yes, This works!
>
> For SDCC, it makes sense to write code like:
>
> BCF bitfield#v( (_bit4 ) /8 ), (_bit4 & 7)
> MOVLW 1 << (_bit10 & 7)
> XORWF bitfield#v( (_bit10 ) /8 ),F
>
> For hand written assembly, it'd be nicer to write:
>
> BCF bitfield(_bit4), (_bit4 & 7)
>
> Where bitfield is defined to be:
>
> #define bitfield(_bit) bitfield#v( (_bit ) /8 )
>
> This doesn't work (with gpasm at least). As far as I can tell, gpasm
> doesn't fully support the #define directive.
>
Your right it doesn't. There is a bug report on Sourceforge.
> Scott
>
>
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