topic Float value printing issue in PE in Kinetis Design Studio

Float value printing issue in PE

syed_idris — Tue, 30 Aug 2016 13:37:28 GMT

Hi,
I know this issue is already discussed in another questions, but when I follow the steps to get float value I am unable to get that.
using KDS3.1.0 + PE

chip: KL03

there is nothing special in my code I am just writing

while(1)
{
PRINTF("\r\n %f",1.234);
OSA_TimeDelay(1000);
}

and it is giving me output as: f

I got two solutions after reading previous questions.

SOLUTION-1: Adding symbol for float in Cross ARM C Compiler>>Preprocessor

After adding this "PRINTF_FLOAT_ENABLE" symbol when I build my code, it is showing error as follows

SOLUTION-2: checking for "-u_printf_float" in Cross ARM C++ Linker>>Miscellaneous

It is printing the output as 'f' only.

I am also attaching here my project file,

why the float value is not getting printed?

Original Attachment has been moved to: float_30082016.zip

Re: Float value printing issue in PE

DavidS — Tue, 30 Aug 2016 18:34:37 GMT

Hi Syed,

Attached is updated project that I got to work on my FRDM-KL03Z4 Freedom board to output floating point using printf as in your case #1 above.

I did have to change UART pinout to switch the RX/TX to make it work but I did not have the errors you indicate when I added the "PRINTF_FLOAT_ENABLE" to the Preprocessor Defined symbols. Note I used "" around the define. Your picture does not. My would compile fine without it but maybe it makes a difference on your system...

I did alter your code to have OS_Task Component so that more tasks could be added to the PE project. Just look for "//DES" to see where I made code changes.

My Terminal Output:

1.234000
1.234000
1.234000
1.234000
1.234000
1.234000

Regards,

David

Please make sure your KDS has had updates applied.

Re: Float value printing issue in PE

syed_idris — Wed, 31 Aug 2016 10:41:17 GMT

Thanks David,
you are correct I forgot to use Quotation marks " " while adding "PRINTF_FLOAT_ENABLE" to the Preprocessor Defined symbols.

Idris