How to make Embedded coder use isnan C-API than implementing custom code?

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Ritesh Rajore
Ritesh Rajore 2019-5-24
编辑： Ritesh Rajore 2019-5-24
My Simulink model uses NaN and some places there is check of same using matlab function isnan().
When I am genertaing C-code using embedded coder, i see generated code has custom implementation of isnan function like below
/* Test if value is not a number */
boolean_T rtIsNaN(real_T value)
{
return (boolean_T)((value!=value) ? 1U : 0U);
}
How can I avoid this and allow EC to use isnan API from math.h from my toolchain. If I use above implementation, it doesnot work as expected in some of my cores which doesnt have FPU. Replacing this and Calling isnan() from math.h works fine for me.
I did web-search but couldnt find any help on this topic.

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回答（2 个）

Naman Bhaia
Naman Bhaia 2019-5-24
I believe Code Replacement Customization can be the possible solution. To implement that, you could develop a code replacement library by referring to this link.
Ritesh Rajore
Ritesh Rajore 2019-5-24
编辑：Ritesh Rajore 2019-5-24
I tried this but it is not reflecting. I defined replacemnet function of rtIsNaN as isnan but I see EC is generating the code as earlier.
In my model, piece of code where nan and its validation is done is in m-file. Not sure if code replacement is applicable for m-file code.

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