1.      The Linker error that I get is:
"The target "C:\Develop\Controller.o" is already up to date.
Executing: "C:\mcc18\bin\mcc18.exe" -p=18F6720 "graphics.c" -fo="graphics.o"
/i"C:\mcc18\h" -Ou- -Ot- -Ob- -Op- -Or- -Od- -Opa-
C:\Develop\graphics.c:26:Warning [2058] call of function without prototype
C:\Develop\graphics.c:29:Warning [2054] suspicious pointer conversion
Executing: "C:\mcc18\bin\mplink.exe" /l"C:\mcc18\lib"
"..\..\mcc18\lkr\18f6720.lkr" "C:\Develop\Controller.o"
"C:\Develop\graphics.o" /o"CR900Controller.cof"
MPLINK 3.20.01, Linker
Copyright (c) 2002 Microchip Technology Inc.
Error - could not find definition of symbol 'sprintf' in file
'C:\Develop\graphics.o'.
Errors    : 1

BUILD FAILED"

2.      Unfortunately I do need most of the functionalities of the sprintf
command.  Below is a cut down of what I am trying to achieve, for now.  itoa
will not be enough for what I need in the long run.

int stringLength;
char tempChar[20], tempChar[20];
float fullPixelMove = 2.57;

sprintf(tempChar,"%.2f", fullPixelMove);
stringLength = strlen(tempChar);
sprintf(tempChar2,"0.%c%c",tempChar[stringLength-2],tempChar[stringLength-1]
);

Regards

Richard .O.


> -----Original Message-----
> From: Richard Osborne [SMTP:richard.osborne@CIRRUSRESEARCH.CO.UK]
> Sent: Monday, March 17, 2003 11:51 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [PIC] Sprintf commands on the C18 compiler
>
> Hi all
>
> I am using the PIC18F8720 and need to use the "sprintf" command which is
> included in the standard C header file "stdio.h".  Unfortunately the
> compiler does not recognise the sprintf command and does not allow you to
> link the header file without syntax errors.
>
When you say syntax errors, is the actual linker error something like
"undefined symbol"?  A few more details on the actual errors and an example
of a (small) piece of code that displays the symptoms would help a great
deal.

>   Is it a case that the compiler
> has been optimised so much that standard C header files such as stdio does
> not work?
>
Optimisation should have no impact on what library functions you can or
cannot use, unless something is badly broken.

> To get it to work is there any setup changes needed or is there a
> different function that could be used that has all the capabilities of
> sprintf?
>
Do you need to use all the capabilities of sprintf?  It's one of a larger
library functions and tends to use a significant amount of memory on small
devices such as PIC's.  You may find some of the simpler functions such as
'itoa' may be suitable for your application.

Regards

Mike

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