topic Floating problem in KDS3.0.0 with KL03. in Kinetis Design Studio

Floating problem in KDS3.0.0 with KL03.

syedidris — Mon, 07 Dec 2015 12:13:19 GMT

I am a beginner using KL03 processor trying to learn with demo codes provided with KDS3.0.0 IDE.

when I am printing the float value like,

float a=2.4;

PRINTF("%f",a);

I am getting output as ' f ' only.

How to overcome with this floating problem.

Re: Floating problem in KDS3.0.0 with KL03.

marek_neuzil — Wed, 09 Dec 2015 15:18:14 GMT

Hello,

The support of float numbers in printf can be enabled by using linker options. For example, when you create a new Kinetis Project in KDS 3.0.0 (with KSDK 1.3.0 and Processor Expert) you can find the option in the Properties of the project, see the following screenshot:

Please note that when this options is enabled the target code (memory footprint) is significantly increased.

Best Regards,

Marek Neuzil

Re: Floating problem in KDS3.0.0 with KL03.

syedidris — Thu, 10 Dec 2015 11:45:15 GMT

Hi Marek,

Thanks for your reply,

I am not using processor expert, I am just editing in the Hello_world demo example with this float print.

I tried as per your suggestion, but I am not getting "Cross ARM C++ linker" option, I did in "Cross ARM C linker" but problem is not solved,

can you please do something.

Re: Floating problem in KDS3.0.0 with KL03.

ZhangJennie — Fri, 11 Dec 2015 07:47:36 GMT

hello,

please refer this article for how to use printf to print floating value in KDS3.0

Semihosting for Kinetis Design Studio V3.0.0 and GNU ARM Embedded (launchpad) | MCU on Eclipse

I also made a demo code on this related. see attached video, can this help you?

Have a great day,
Jennie Zhang

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: Floating problem in KDS3.0.0 with KL03.

syedidris — Fri, 11 Dec 2015 12:38:38 GMT

I am not getting "Cross ARM C++ linker" option.:smileyconfused:

Re: Floating problem in KDS3.0.0 with KL03.

ZhangJennie — Mon, 14 Dec 2015 02:51:45 GMT

are you sure you use KDS3.0?

please send me:

1. your KDS build ID.

2. your demo project

3. your KDS properties' screenshot.

thanks!

Have a great day,

Jennie Zhang

Re: Floating problem in KDS3.0.0 with KL03.

syedidris — Mon, 14 Dec 2015 10:26:44 GMT

Yes, I am using KDS 3.0.0.

In sample code of Hello_world example I just commented the statement

PRINTF("\r\nHello World!\n");

and replaced with statement

PRINTF("%f",1.23);

I am attaching my project file and also screenshot of my KDS properties.

Re: Floating problem in KDS3.0.0 with KL03.

DavidS — Mon, 14 Dec 2015 22:08:18 GMT

Hi Syed,

Please review following post: Re: Floating Point on KDS

Regards,

David

Re: Floating problem in KDS3.0.0 with KL03.

syedidris — Wed, 23 Dec 2015 10:16:24 GMT

Hi,

As a beginner I am just trying to understand the basic examples provided with the KDS 3.0.0 (with KL03 processor).

I was going through the "adc_lptmr_trigger" code. I just tried float value printing in this program but it is not printing, I followed the steps given by DavidS it was working good in hello_world example but not working here.

1. what should I do to get float value result?

2. Is there any way by which I can print float value in any code?