Re: [Sdcc-user] addressing bits

[Steve P. <wb...@ma...>]

Guilherme,

P1_1 gets you to P1.1, and likewise to other P#.# sbits.  Search for it i=
n the=20
sdcc header file mcs51reg.h, which is included with sdcc.  Referring to t=
hat=20
header has helped me with several porting issues.=20

Thanks, Steve

On Thursday 04 December 2003 10:18 am, Guilherme Neuman wrote:
> Hi,
>
> I'm new to sdcc, I've used keil for some months and I'm trying to find =
out
> the main differences in writing code for each other.
> The first thing I noticed is that I'm not able to address a bit of a
> register unless I explicitly declare it. Let me make it clear:
> In the keil compiler if I had a sfr declared
> sfr P1 =3D 0x90;
> I could address it's first bit
> P1^0 =3D 0;
> In avcase compiler (an old vrsion in my school) I would do
> P1.1 =3D 0;
> I've tried both ways in sdcc, but none seem to work:
> sfr at 0x90 P1;
> P1.1 =3D 0; gives a parse error
> P1^1 seems to be like P1 XOR 1, so doesn't work for me either.
>
> Does anybody know how to do that or can you tell me if I simply can't d=
o
> that?
> And do you know anything else I should take care of while migrating? So=
 far
> the only thing I've found is that I must declare sfr and sbit in a
> different way.
> Also in keil I have to set up the chip I'm working with. I don't know i=
f
> it's mandatory, but do you know how should I do it in sdcc? The chip I'=
m
> using is the Philips p89c557e4.
>
> Thank you very much for any help you can provide me.
> Guilherme
>
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