CodeWarrior for QorIQのトピックatof

atof

Emoretti — Wed, 09 Sep 2009 05:31:54 GMT

Hi, i write this simple code for mcf51jm128 and the compiler send this error

please help

" Link Error : Undefined : "atof" Referenced from "main" in main.c "

and

Link Error : Undefined : "atoi" Referenced from "main" in main.c "

#include <stdlib.h>
static char s[] = "-49.3";

static char t[]= "125";

float f;

int i;

void main(void) {

f = atof(s);
i = atoi(t);

Re: atof

CompilerGuru — Wed, 09 Sep 2009 11:43:37 GMT

This means that you do not link the corresponding library.

Create a new project with the wizard to see which libraries to use

or read

Help\PDF\ColdFireV1_Build_Tools_Reference.pdf, chapter 20, ColdFire Runtime Libraries.

Daniel

Re: atof

Emoretti — Thu, 10 Sep 2009 01:14:42 GMT

helo

i ´am create a new project with the wizard and load this libraries, I´am uninstal and instal codwarrior and send Link Error : Undefined : "atof"

plese help

fp_coldfire_nodiv.a

C_4i_CF_RegABI_MATH_MSL.a

C_4i_CF_RegABI_Runtime.a

or read

Help\PDF\ColdFireV1_Build_Tools_Reference.pdf, chapter 20, ColdFire Runtime Libraries.

Daniel

Re: atof

CompilerGuru — Fri, 11 Sep 2009 04:55:56 GMT

Hmm,

not sure why those methods are not defined.

atoi can easely be implemented based on strtol:

int atoi(const char * str){  return(strtol(str, NULL, 10));}

For atof all the source code is available, not sure why it is not built into the library.

You can add those files to your project to get a working atof implementation:

ColdFire_Support\msl\MSL_C\MSL_Common\Src\strtold.c

ColdFire_Support\msl\MSL_C\MSL_ColdFire\Src\math_cf.c

ColdFire_Support\msl\MSL_C\MSL_Common\Src\scanf.c

ColdFire_Support\msl\MSL_C\MSL_Common_Embedded\Src\ansi_fp.c

As alternative a simple special purpose atof might save a bit of flash space.

Daniel

Re: atof

jky — Wed, 28 Oct 2009 07:22:57 GMT

Hello,

I have Codewarrior 6.2 and am compiling for a coldfire V1 chip.

I solved this problem:

1. Libraries in project

fp_coldfire_ieee_nodiv.a

C_4i_CF_RegABI_Runtime.a

C_4i_CF_RegABI_MATH_MSL.a

2. Open up MSL_C.CF.v1.mcp project file.

a. Set target to MATH 4i ColdFire RegABI

b. Open ansi_prefix.CF.v1.h

1. add #define __CF_USE_FULL_LIBS__ 1

at the start of file

2. change #define _MSL_HIWARE_COMP 1 to

#define _MSL_HIWARE_COMP 0

3. change #define _MSL_C99 0 to

#define _MSL_C99 1

c. add ansi_fp.c to to project it is in directory

<wherever Codewarrior instaled>\Coldfire_Support\msl\MSL_C\MSL_Common_Embedded\Src

d. build MATH 4i ColdFire RegABI target

If we did everything right it should build fine. And a check mark will appear next to C_4i_CF_RegABI_MATH_MSL.a library in your application project.

Then viola atof will link.

When I did this my binary image grew about 6K

Oh before I did this I had already done the fix for %f format

working FAQ 28628

Don't know if you have to this first to wore out to undo and

see if it matters.. But if you want to print floats you will have

to follow FAQ 28628

Hope this helps

John