topic Re: Cosmic Compiler Port in CodeWarrior for MCU

Cosmic Compiler Port

Ken32 — Sun, 30 Mar 2008 04:00:44 GMT

Hi,
I'm trying to port a MicroC OS II project from Cosmic CrapPiler to Codewarrior. I'm getting like 51 L1818 errors.
Here's an example of one...
Link Error : L1818: Symbol 241 - PORTA duplicated in OS_FLAG.C.o and OS_CORE.C.o

I have no idea why its doing this. I have PORTA defined in iosc32.h which is a Cosmic include file.

Here's part of the source:
/*    IO DEFINITIONS FOR MCS912C32
*    Copyright (c) 2003 by COSMIC Software
*/
#ifndef _BASE
#define _BASE    0
#endif
#define _IO(x)    @(_BASE)+(x)

typedef unsigned char __uchar;
typedef unsigned int __uint;

/*    MEBI Module
*/
volatile __uchar PORTA       _IO(0x00);   /* port A */
volatile __uchar PORTB       _IO(0x01);   /* port B */
volatile __uchar DDRA        _IO(0x02);   /* data direction port A */
volatile __uchar DDRB        _IO(0x03);   /* data direction port B */
volatile __uchar PORTE       _IO(0x08);   /* port E */
volatile __uchar DDRE        _IO(0x09);   /* data direction port E */
.
.
.

So PortA is defined here...and not in OS_FLAG.c.o or that other file. Infact its not even used in any of those files? Anyone know what this is?
Also I have not set any linker settings...not sure how that's done here. I heard that Codewarrior links for you?

Re: Cosmic Compiler Port

CompilerGuru — Sun, 30 Mar 2008 09:18:51 GMT

CW wants for every variable one definition, but your header is
currently defining all the variables (and not just declares them). Basically
absolute allocated variables with @ are behaving not different from any other variable (or function).
To fix your case, the simplest is to add an extern, which is disabled for all but a single use case.
E.g. something like:

Code:

// header.h#ifndef DEFINE_VARS_IO#define EXT_IO extern#else#define EXT_IO#endif...EXT_IO volatile __uchar PORTA       _IO(0x00);   /* port A */EXT_IO volatile __uchar PORTB       _IO(0x01);   /* port B */....and in  one C file, or in a new dedicated one:#define DEFINE_VARS_IO#include "header.h"

Daniel

Re: Cosmic Compiler Port

Stephen — Fri, 11 Apr 2008 07:51:22 GMT

Hi Ken

Just looked at your code - happens to be very similar to an issue I have been sorting out with a colleague who has previously used a different compiler. Can I suggest the following change:

Here's part of the source:
/*    IO DEFINITIONS FOR MCS912C32
*    Copyright (c) 2003 by COSMIC Software
*/
#ifndef _BASE
#define _BASE    0
~~#endif~~    <- MOVE THIS STATEMENT to the end of the file

#define _IO(x)    @(_BASE)+(x)

typedef unsigned char __uchar;
typedef unsigned int __uint;

/*    MEBI Module
*/
volatile __uchar PORTA       _IO(0x00);   /* port A */
volatile __uchar PORTB       _IO(0x01);   /* port B */
volatile __uchar DDRA        _IO(0x02);   /* data direction port A */
volatile __uchar DDRB        _IO(0x03);   /* data direction port B */
volatile __uchar PORTE       _IO(0x08);   /* port E */
volatile __uchar DDRE        _IO(0x09);   /* data direction port E */
.
.
.
#endif /* _BASE */   <- put the statement here

Now the first time the compiler goes through the file, it will define _BASE and process the rest of the header. The second time the compiler opens the header file, it sees _BASE is defined and skips everything else.

IMHO the CodeWarrior compiler is more strict (sensitive) about stuff like this.

Good luck with your coding

Steve

Re: Cosmic Compiler Port

CompilerGuru — Fri, 11 Apr 2008 09:33:32 GMT

Hi Steve,

I think you misunderstood here what _BASE is for.
I dont think this is the multiple time inclusion guard, instead for the S12's, the register block is moveable and this _BASE is a way an user could adapt this library to use an alterative base address.

Daniel