ColdFire/68K Microcontrollers and ProcessorsのトピックRe: sprintf problem in MCF51QE128 and Codewarrior.

sprintf problem in MCF51QE128 and Codewarrior.

erooll — Sun, 13 Jul 2008 13:56:37 GMT

Hi all.

I'm trying to use sprintf function to convert a float value to a string, but it doesn't work, this function with integer values works fine.
an example of use is this:

int   valueInteger;
float valueFloat;
char str[32];

valueInteger = 420;
valueFloat = 4.20;

sprintf(str,"%d",valueInteger);   //works fine
sprintf(str,"%f",valueFloat);     //Doesn't work

I read help of CodeWarrior about sprintf function and this note at the end of page could be the way to fix my problem

NOTE

Floating point support increases the sprintf size considerably, and therefore the define LIBDEF_PRINTF_FLOATING exists. Set LIBDEF_PRINTF_FLOATING if no floating point support is used. Some targets contain special libraries without floating point support.
The IEEE64 floating point implementation only supports printing numbers with up to nine decimal digits. This limitation occurs because the implementation is using unsigned long internally, which cannot hold more digits. Supporting more digits increases the printf size still more and also causes the application to run considerably slower.

How I set LIBDEF_PRINTF_FLOATING in order to sprintf works?

Re: sprintf problem in MCF51QE128 and Codewarrior.

kef — Sun, 13 Jul 2008 22:02:20 GMT

Try if this helps

http://forums.freescale.com/freescale/board/message?board.id=CW816COMM&message.id=3734&query.id=48098#M3734

Re: sprintf problem in MCF51QE128 and Codewarrior.

alfredogualdron — Wed, 15 Jan 2014 16:35:11 GMT

Same problem,

But the link is broken

Re: sprintf problem in MCF51QE128 and Codewarrior.

TomE — Wed, 15 Jan 2014 22:30:12 GMT

The link is broken because the forum is now running different software to what it was in 2008.

Cut/paste "LIBDEF_PRINTF_FLOATING" into the Search Bar at upper right, read the 9 or so matches, and then update this thread with the best answer to your problem.

Tom

Re: sprintf problem in MCF51QE128 and Codewarrior.

alfredogualdron — Thu, 23 Jan 2014 16:40:32 GMT

I found a place in codewarrior where we can configure which variable types are allowed for printf

here is the pic

after select the int_FP in the print formats option, the printf function started to work fine..

hope it helps

Re: sprintf problem in MCF51QE128 and Codewarrior.

orlandozapata — Tue, 28 Jan 2014 17:07:30 GMT

Alfredo´s solution works perfect !! thanks man.

Re: sprintf problem in MCF51QE128 and Codewarrior.

PO220 — Thu, 10 Sep 2015 22:03:32 GMT

Can you run your application without BDM with ewl_hosted option ?

With my Kinetis KL run without multilink is not possible in "ewl_hosted", only possible with "ewl". But in "ewl" sprintf, printf, scanf don't work.

(I do not understand the "ewl_hosted" mode interest if you can not operate without programmer connexion. The fate of a microcontroller is to live without debug connexion, is not it ?)

thanks

Re: sprintf problem in MCF51QE128 and Codewarrior.

TomE — Fri, 11 Sep 2015 00:30:54 GMT

This is a Kinetis and/or Codewarrior question. You should be searching those forums for answers, and then posting in them if you don't find anything.

Tom

Re: sprintf problem in MCF51QE128 and Codewarrior.

PO220 — Fri, 11 Sep 2015 07:55:55 GMT

I do that... searching and don't finding..