topic ATOF doesn't work in Classic/Legacy CodeWarrior

ATOF doesn't work

TroyCorser — Thu, 29 Nov 2007 21:30:28 GMT

The function ATOF and also ATOI and ATOL don't works.

this is the sample code I take from CW help System:

#include <stdlib.h>
#include <stdio.h>

int main(void)
{
   int i;
   long int j;
   float f;
   static char si[] = "-493", sli[] = "63870";
   static char sf[] = "1823.4034";

   f = atof(sf);
   i = atoi(si);
   j = atol(sli);

   return 0;
}

The Output I get on debug mode on DSP56F8367 is :

72659.2

WTF??

Re: ATOF doesn't work

CrasyCat — Thu, 29 Nov 2007 23:35:20 GMT

Hello

- Which CPU are you targeting (HC08, HC12, Coldfire, ..)
- Which version of CodeWarrior are you using?
To retrieve that info:
- Start CodeWarrior
- Select Help -> About Freescale CodeWarrior
- Click on "Install Products"
- CodeWarrior version used is displayed on top in the Installed Products dialog.

CrasyCat

Re: ATOF doesn't work

TroyCorser — Fri, 30 Nov 2007 15:28:45 GMT

Hi CrasyCat,

with a little change to the example ATOI and ATOL now works

I've changed this :

" static char si[] = "-493", sli[] = "63870";
static char sf[] = "1823.4034";
"

with this:

" char si[] = "-493", sli[] = "63870";
char sf[] = "1823.4034";
"

The Output I get on debug mode on DSP56F8367 is :

72659.2

-493

63870

but ATOF the main function that I need to use, as you can see in the output results, still doesn't work!

The CPU I'm using is : DSP56F8367

CodeWarrior 56800/E Hybrid Controller version 7.3

ROHS USBTAP Update v1.0, build 60405

Re: ATOF doesn't work

J2MEJediMaster — Fri, 30 Nov 2007 23:33:38 GMT

The function atof() is supposed to return the values as a double. I'd try changing the type declaration of f from float to double and see what happens.

---Tom

Re: ATOF doesn't work

TroyCorser — Mon, 03 Dec 2007 15:36:08 GMT

I've tryed to change from float to double.. but I get the same result... wrong output!!

I see that the wrong value I get sometimes don't change with the input data,

indipendently of the input type, float or double:

now with this input in sf the output is:

sf = "1823.4034" output= -2.346737e-19

sf = "-23.4" output= -2.346737e-19

sf = 22.4" output= -2.346737e-19

always the same output...

I need to use this function... how can it be that I can't use it with CodeWarrior ?!?

I'm going carzy!

Re: ATOF doesn't work

TroyCorser — Mon, 03 Dec 2007 16:17:21 GMT

I've cheked the global variable "errno" that returns always 34: "ERANGE" after the call to ATOF with any value of input...

Overflow bit of the __strtold is high (1)

Message Edited by Troy Corser on 2007-12-03 08:43 AM

Re: ATOF doesn't work

TroyCorser — Mon, 03 Dec 2007 18:18:43 GMT

Problem solved!!!

Now it works!

The point was:

on the "Idm internal memory with pRom-to-xRAM copy Settings"

in the sub-menu:

M56800E Target settings

the field processor was setted on "generic"

now I've setted it on my specific processor M56F8367

Thanks to all who partecipate to this discussion!

Re: ATOF doesn't work

J2MEJediMaster — Tue, 04 Dec 2007 00:52:00 GMT

Thanks for telling us how you solved the problem. And I'm sorry our suggestions didn't work.

---Tom

Re: ATOF doesn't work

TroyCorser — Mon, 10 Dec 2007 17:52:23 GMT

I'm here again...

What I thought It worked now don't!..

The first tests was going well...but some time later...

atof didn't work...

In the first step It look likes as atof work on numbers >1.0 and didn't work with number <1.0

for example atof(0.02) = 0.0

but after a big number of attempts I see that also atof(X) with x > 1.0 sometimes don't work...

So I'm stiil losing time tring to solve this problem!

Example : atof("1.7")

atof call the function strtod => return(strtod(str, NULL));

strtod call => __strtold(INT_MAX, &__StringRead, (void *)&isc, &count, &overflow);

after the execution of __strtold

overflow = 1 , count =3, value = -1.173368e-19

Any help.. how can happen this...?!

Added information : the sistem I'm using is integrated with microC/OS-II RTOS

I've already tried the atof function with OS interrupt enabled and disabled.

Message Edited by Troy Corser on 2007-12-10 10:09 AM

Re: ATOF doesn't work

TroyCorser — Mon, 10 Dec 2007 20:01:50 GMT

Example : atof("1.7")

atof call the function strtod => return(strtod(str, NULL));

strtod call => __strtold(INT_MAX, &__StringRead, (void *)&isc, &count, &overflow);

after the execution of __strtold

overflow = 1 , count =3, value = -1.173368e-19

inside the function __strtoold there is a tree that entered without a resonable reason :

else if (result > LDBL_MAX)
  {
   *overflow = 1;
   result    = HUGE_VAL;
  }
  "

result is "1.70000"

LDBL_MAX is defined in cfloat in this way:

#if _MSL_DOUBLE_SIZE == 32

#if _MSL_FLOAT_HEX
#define DBL_MAX 0x1.fffffeP127

#elif _MSL_DOUBLE_SIZE == 64

#if _MSL_FLOAT_HEX
#define DBL_MAX 0x1.fffffffffffffP1023

Re: ATOF doesn't work

J2MEJediMaster — Tue, 11 Dec 2007 23:10:11 GMT

Looks like it's time for you to enter a service request for this problem. Click here to do so. You may want to send them an archived version of your project so that they can examine the code in detail.

---Tom