AVR-Chat

Hi Folks,

This is probably something I'm overlooking but can somebody point me
in the right way concerning this?

I need to add this to one of the header files:

#define  SPIF     7  // bit position for the SPIF bit in the SPSR 

If I add this I get 8 warnings complaining 
"Unreferenced function 'Function1'"
"Unreferenced function 'Function2'"
"Unreferenced function 'Function3'"
"Unreferenced function 'Function4'"
"Unreferenced function 'Function5'"
"Unreferenced function 'Function6'"
"Unreferenced function 'Function7'"
"Unreferenced function 'Function8'"

I have properly (I think) defined these functions as prototypes in the
Header file.  If I remove the #define SPIF  7 line the warnings all go
away but then the compiler gives me two errors complaining that SPIF
is undefined.  

I'm using the latest CodeVision.

Any ideas?

Thanks,

Richard Cooke

Yes, they are called from the C file.  It was a very late night last
night and I finished (at least I thought I had) part of the code.  I
didn't actually add the C file into the project until this morning.  A
s soon as I actually called the functions the warnings went away.

Thanks for jogging my brain awake.

Richard

--- In AVR-Chat@yahoogroups.com, Ralph Hilton <ralph@...> wrote:

>
> On Tue, 17 Apr 2007 16:03:56 -0000 you wrote:
> 
> Are you actually calling the functions somewhere?
> 
> >Hi Folks,
> >
> >This is probably something I'm overlooking but can somebody point me
> >in the right way concerning this?
> >
> >I need to add this to one of the header files:
> >
> >#define  SPIF     7  // bit position for the SPIF bit in the SPSR 
> >
> >If I add this I get 8 warnings complaining 
> >"Unreferenced function 'Function1'"
> >"Unreferenced function 'Function2'"
> >"Unreferenced function 'Function3'"
> >"Unreferenced function 'Function4'"
> >"Unreferenced function 'Function5'"
> >"Unreferenced function 'Function6'"
> >"Unreferenced function 'Function7'"
> >"Unreferenced function 'Function8'"
> >
> >I have properly (I think) defined these functions as prototypes in the
> >Header file.  If I remove the #define SPIF  7 line the warnings all go
> >away but then the compiler gives me two errors complaining that SPIF
> >is undefined.  
> >
> >I'm using the latest CodeVision.
> >
> >Any ideas?
> >
> >Thanks,
> >
> >Richard Cooke
> 
> --
> Ralph Hilton
> http://www.ralphhilton.org
> C-Meter: http://www.cmeter.org
> FZAOINT http://www.fzaoint.net
>

Watch out how you comment defines. SPIF will be replaced with a "7" and
the rest of the line will be commented out. If you must comment inline,
use a block comment:

    #define  SPIF     7  /* bit position for the SPIF bit in the SPSR */

to preserve the rest of the line.

Bruce 


--- In AVR-Chat@yahoogroups.com, "Richard Cooke" <rcooke@...> wrote:

>
> Hi Folks,
> 
> This is probably something I'm overlooking but can somebody point me
> in the right way concerning this?
> 
> I need to add this to one of the header files:
> 
> #define  SPIF     7  // bit position for the SPIF bit in the SPSR 
> 
> If I add this I get 8 warnings complaining 
> "Unreferenced function 'Function1'"
> "Unreferenced function 'Function2'"
> "Unreferenced function 'Function3'"
> "Unreferenced function 'Function4'"
> "Unreferenced function 'Function5'"
> "Unreferenced function 'Function6'"
> "Unreferenced function 'Function7'"
> "Unreferenced function 'Function8'"
> 
> I have properly (I think) defined these functions as prototypes in the
> Header file.  If I remove the #define SPIF  7 line the warnings all go
> away but then the compiler gives me two errors complaining that SPIF
> is undefined.  
> 
> I'm using the latest CodeVision.
> 
> Any ideas?
> 
> Thanks,
> 
> Richard Cooke
>

On Tue, 17 Apr 2007 16:03:56 -0000 you wrote:

Are you actually calling the functions somewhere?

>Hi Folks,
>
>This is probably something I'm overlooking but can somebody point me
>in the right way concerning this?
>
>I need to add this to one of the header files:
>
>#define  SPIF     7  // bit position for the SPIF bit in the SPSR 
>
>If I add this I get 8 warnings complaining 
>"Unreferenced function 'Function1'"
>"Unreferenced function 'Function2'"
>"Unreferenced function 'Function3'"
>"Unreferenced function 'Function4'"
>"Unreferenced function 'Function5'"
>"Unreferenced function 'Function6'"
>"Unreferenced function 'Function7'"
>"Unreferenced function 'Function8'"
>
>I have properly (I think) defined these functions as prototypes in the
>Header file.  If I remove the #define SPIF  7 line the warnings all go
>away but then the compiler gives me two errors complaining that SPIF
>is undefined.  
>
>I'm using the latest CodeVision.
>
>Any ideas?
>
>Thanks,
>
>Richard Cooke

--
Ralph Hilton
http://www.ralphhilton.org
C-Meter: http://www.cmeter.org
FZAOINT http://www.fzaoint.net

Excellent catch about using comments in defines, it has caught me out
in the past because:

#define max 100 //largest value  

in the line 

for (count = 0; count < max; count++)

will turn into something like:

for (count = 0; count < 100 //largest value; count++)

which obviously wouldnt work.

Good Catch Bruce !

Cheers
Hein B
Auckland, New Zealand

--- In AVR-Chat@yahoogroups.com, "Bruce Parham" <obparham@...> wrote:

>
> Watch out how you comment defines. SPIF will be replaced with a "7" and
> the rest of the line will be commented out. If you must comment inline,
> use a block comment:
> 
>     #define  SPIF     7  /* bit position for the SPIF bit in the SPSR */
> 
> to preserve the rest of the line.
> 
> Bruce 
> 
> 
> --- In AVR-Chat@yahoogroups.com, "Richard Cooke" <rcooke@> wrote:
> >
> > Hi Folks,
> > 
> > This is probably something I'm overlooking but can somebody point me
> > in the right way concerning this?
> > 
> > I need to add this to one of the header files:
> > 
> > #define  SPIF     7  // bit position for the SPIF bit in the SPSR 
> > 
> > If I add this I get 8 warnings complaining 
> > "Unreferenced function 'Function1'"
> > "Unreferenced function 'Function2'"
> > "Unreferenced function 'Function3'"
> > "Unreferenced function 'Function4'"
> > "Unreferenced function 'Function5'"
> > "Unreferenced function 'Function6'"
> > "Unreferenced function 'Function7'"
> > "Unreferenced function 'Function8'"
> > 
> > I have properly (I think) defined these functions as prototypes in the
> > Header file.  If I remove the #define SPIF  7 line the warnings all go
> > away but then the compiler gives me two errors complaining that SPIF
> > is undefined.  
> > 
> > I'm using the latest CodeVision.
> > 
> > Any ideas?
> > 
> > Thanks,
> > 
> > Richard Cooke
> >
>

Hi guys,

On 4/17/07, kernels_nz <kernels@slingshot.co.nz> wrote:
> Excellent catch about using comments in defines, it has caught me out
> in the past because:
>
> #define max 100 //largest value
>
> in the line
>
> for (count = 0; count < max; count++)
>
> will turn into something like:
>
> for (count = 0; count < 100 //largest value; count++)
>
> which obviously wouldnt work.

Actually, that should work just fine. Because according to the
language specification comments are supposed to be treated as white
space.

I know that GCC will actually replace comments with whitespace prior
to passing the code onto the compiler. Perhaps other compilers aren't
doing the right thing...

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/