Lpc2000

Make sure the identifier from your error message is exactly the same as 
the identifier after the .global. I used to code x86 assembler in masm 
or tasm and there you had to prefix the identifier with an underscore ( 
_ ). When I started with ARM also did this and it gave the same errors 
you are getting now.

Make sure you use extern "C" { ..... } if you are coding in c++, 
otherwise the identifiers are decorated (to make overloading possible 
and add some extra error checking).

Regards,
Richard.


dgaydou wrote:
> i\ufffdm afraid, i\ufffdve already done it, as you tell me in your example. It
> must be something else... another idea, please.
> Thanks for your help
>
> --- In lpc2000@yahoogroups.com, "brendanmurphy37"
> <brendanmurphy37@...> wrote:
> >
> > --- In lpc2000@yahoogroups.com, "dgaydou" <dgaydou@> wrote:
> > >
> > > Hi group,
> > > i`m doing my first steps with LPC2114 and gnuarm. I\ufffdve found a
> > trouble
> > > when i try to link the objects files from c-sources and as-
> sources
> > with
> > > arm-elf-ld and the following parameters : -Map main.map -
> > TPruebaLPC.ld -
> > > t. The linker tell me: Undefined reference to `THOSE FUNCTIONS
> > THAT ARE
> > > WROTE IN ASSEMBLER`; although i\ufffdve declared those functions in my
> > > headers files and properly included. Hope someone can help me.
> > Thanks.
> > >
> >
> > Do you have the assembler directive ".global" in the assembler
> > source file? Without it the function name is not visible to the
> > linker. This behaviour is different from 'C' in that the default is
> > NOT to make function names visible.
> >
> > Example:
> >
> > /* list functions exported from this file */
> >
> > .global      GetCPSR, SomeOtherFunction
> >
> > /* implementation of GetCPSR */
> >
> > GetCPSR:
> >     mrs  r0, cpsr  /* Get CPSR */
> >     bx   lr        /* return to caller */
> >
> > This can be declared in 'C' as:
> >
> > unsigned int GetCPSR(void);
> >
> > and used as:
> >
> > unsigned int cpsr = GetCPSR();
> >
> > My guess is that this is your problem.
> >
> > Brendan
> >
>
>
>
>
>
>
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