Fw: [Sdcc-user] How to define port lines as extern?

[Royce & S. P. <be...@im...>]

Hi,
This means that I have to compile my max187.c file again for every project?
Also do I need different  max187_def.h file for each project?

This will defeat my purpose as I wanted to make my max187 function a library
function, i.e permanently define the bits as global in the max187 module &
initialise them with the required port bits in the main C file.

Again, can be this done?

Thanks to all,

--Royce.

----- Original Message -----
From: Rod Boyce <rod...@st...>
To: SDCC list <sdc...@li...>
Sent: Thursday, April 11, 2002 1:13 AM
Subject: RE: [Sdcc-user] How to define port lines as extern?


> Have you not heard of header files this is one of their many exact
purposes
> I have done this on many occasion.  You define in the header file what
port
> pins to use how else does the linker know where to find the port pins for
> that module.  I have even used a separate include file for definable items
> like this when the project required it.
>
> Example:
>
> File max187_def.h
>
> #ifndef MAX187_DEF_H
> #define MAX187_DEF_H
>
> #define P3_5 cs_adc
> #define P3_6 clk_adc
> #define P3_7 data_adc
>
> #endif
> part of file max187.c
>
> #include "max187_def.h"
>
>
> It really is that simple.
>
>
> Regards,
> Rod Boyce.
>
>  -----Original Message-----
> From: Royce & Sharal Pereira [mailto:be...@im...]
> Sent: Thursday, 11 April 2002 12:02 a.m.
> To: SDCC list
> Subject: Re: [Sdcc-user] How to define port lines as extern?
>
> Hi,
> Even after doing:
>     #define P3_5 cs_adc
> in my main C file, the linker still says
>      " undefined global "_cs_adc"  in module max187"
>
> Right now I'm cut-pasting the max187 function in my main C file for every
> project,  which I want to avoid!
>
> Is there a way?
>
> Thanks,
> --Royce.
>
> ----- Original Message -----
> From: Gernot.Fink <ger...@ne...>
> To: SDCC list <sdc...@li...>
> Sent: Tuesday, April 09, 2002 8:01 PM
> Subject: Re: [Sdcc-user] How to define port lines as extern?
>
>
> > On Tue, 09 Apr 2002, you wrote:
> > >
> > >extern bit cs_adc, ck_adc, dat_adc; (also tried sbit).
> > >
> > >In my main C file I tried:
> > >
> > >sbit at P3_5 cs_adc;   & got " constant expected variable found".
> > >
> > >Tried:      sbit at 0xb5 cs_adc;
> >
> >
> > You can use :
> >
> > #define  cs_adc  P3_5
> >
> > The Variable P3_5 is in the headerfile for your uc declared.
> >
> > --
> > MFG Gernot
> >
> > _______________________________________________
> > Sdcc-user mailing list
> > Sdc...@li...
> > https://lists.sourceforge.net/lists/listinfo/sdcc-user
>
>
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