TMS320F280049: Question about IQmath and COFF/EABI

Jenson said:

Result:I thought I should get p->ftheta=0.25 but it didn't. Why is this? How should I modify.

What is the initial itheta value? f theta will be itheta / 2^15. 

Jenson said:

2.And I found that there will be format conflicts. I wonder if this Lib is used in COFF, but we need to run under EABI, so there are the following problems.How should we avoid this problem?

Please affix a 'f' at the end of all float values. The EABI compiler will treat all float values without an 'f' as a double.

Jenson said:

 I think maybe this Lib is setup under COFF and I am running EABI. If I need to run under EABI, how should I solve this problem so that I can run IQmath.lib and PM_SINCOS.LIB smoothly? (BTW, I use IQmath.lib as shown in the picture).

IQMath.lib is a symbols library which will choose the correct library based on project configurations. If you are directly using the appropriate IQMath library, remove IQMath.ib and use either IQMath_Eabi.lib or IQMath_fpu32_eabi.lib depending on whether or not you have enabled fpu32 in your project.

-Shantanu

Hi Shantanu,

Sorry for late!

The only problem I'm currently having is that _IQ15toF doesn't work.

My code is as follows ：

p->itheta = coarseAngle + fineAngle; // IQ15
p->ftheta = _IQ15toF(p->itheta); // floating-point

If the code works, the ftheta should show 0.25, but it doesn't turn out like that.

Do you have any comments on this？

Thanks

Jenson

Jenson,

The result should be 0.00000762939453125. Can you verify if the IQTables and IQMath lib are properly allocated? Can you share the .map file of your project that is generated post compilation?

-Shantanu

Hi Shanty,

I will send you an email via email pls check it!

Thanks

Jenson