Kinetis Microcontrollers中的主题 Re: TWR-K21F120M float Data types

TWR-K21F120M float Data types

黃佑煊 — Fri, 20 Mar 2015 02:14:09 GMT

Dear sir, I have a TWR-K21F120M

But, when I want to use floating-point operations, there will be an error

Thank you very much ~~

ivadorazinova — Fri, 20 Mar 2015 13:27:36 GMT

Hello 佑煊黃,

Please, check settings in KDS.

these documents could help you solve your problem:

I hope it helps,

Best Regards,

Iva

黃佑煊 — Mon, 30 Mar 2015 10:00:10 GMT

Dear sir,

Sorry! I do not understand how to set this.

Thank you very much ~~

ivadorazinova — Tue, 31 Mar 2015 11:48:06 GMT

Dear 佑煊黃,

Never mind. Please, try do it by this way:

Change std_prv.h to following:

#ifndef STD_FP_IO		//DES added #ifndef
#define STD_FP_IO 0

#endif

and change the value in Preprocessor STD_FP_IO = 1

Best Regards,

Iva

黃佑煊 — Wed, 01 Apr 2015 01:21:16 GMT

Dear sir,

I can not find the preprocessor options

Alice_Yang — Wed, 01 Apr 2015 02:59:43 GMT

Hi 佑煊，

Do you use CW10.6 ?

In you screenshot , where show the float error ?

And about the float configuration on CodeWarrior, you can select on here :

And i have test on my side (mk21fn1m0 - CW10.6), when define like your code (float tt; tt = 2.0f), it can work well.

So could you show detail the float error .

Best Regards,

Alice

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