TMS320F28377S: 28XX CLA function call in CLA task

thanks for your reply.

I'm using CCS 8.3.1,I change the compiler for V18 to  22.6.0.LTS.  it  still didn't work. dan it come out several warnings(below)

in my clatask1 prog , it calls  VgPLLCal(&alg_data_grid, &VgPLL); the prog runs to VgPLLCal(&alg_data_grid, &VgPLL), but it fleet 

I put pData->Vgab = 10X.0 symbols to get where the prog runs, then  i can see pData->Vgab = 103.0(means it runs to  the line before calling abc_to_d(p->Vga_pu, p->Vgb_pu, p->Vgc_pu, p->Theta_grid,p->Vgpd_pu0);)

considering the warning(related to sin cos sqrt ...  mathlib),  and the  abc_to_d()func used sin cos func , is it possible the reason is using sin cos funcs, so the prog fleet?  and how to solve the warning related to mathlib(sin cos sqrt)?

wish to get your reply.

It looks like the code is making calls to the C28x math routines which is not allowed. For CLA there is a math library located in this directory:

C:\ti\c2000\C2000Ware_<version>\libraries\math\CLAmath

Regards

Lori

Yes, I use CLAsin cos and inclueded CLAmath.h,then it works.  but func CLAsqrt() still don‘t work.  i open the CLAmath.h  and found that sqrt() don’t have a table(just sqrt func prototype), unlike sincos funcs.   

I refer to the docu  CLA Math Library USER’S GUIDE,but  i still fail to cope with it.

Freeman Wu said:

but func CLAsqrt() still don‘t work. 

Please provide more detail on how it is not working.

Does the compiler issue an error/warning? If so, what is the error/warning?

or is the result incorrect?

Does the example project work as expected?

C:\ti\c2000\C2000Ware<version>\libraries\math\CLAmath\c28\examples\sqrt\ccs

Freeman Wu said:

i open the CLAmath.h  and found that sqrt() don’t have a table(just sqrt func prototype)

The CLAsqrt routine does not use a lookup table. You can view the algorithm in the source code comments. 

C:\ti\c2000\C2000Ware<version>\libraries\math\CLAmath\c28\source

in the clatask1() interrupt func, I call VgPLLCal(), and in VgPLLCal() I use CLAsin\ CALcos and CLAsqrt,  CLAsin\ CALcos works well,but when calling  CLAsqrt, the prog fleet. in the VgPLLCal() below:

I can see in the watch expression   pData->Vgab = 138.0,  which prove that the prog runs to  Line1340 and then fleet,. if not if it runs to L1342,then  pData->Vgab = 128.0

when build the project, there are warnings(fig below1 ): clamath .h and lib used(fig below2)  , cms file (fig below3)

Hello Freeman,

By 'fleet' do you mean 'stops' ?

Here are some debug suggestions. 

1 - Try the example project as provided and see if it works as expected

• C:\ti\c2000\C2000Ware<version>\libraries\math\CLAmath\c28\examples\sqrt\ccs

2 - Modify the input values in the example function to be similar to yours - does it still work?

3 - Modify the inputs to the CLA sqrt function to something simple to see if your code continues to line L1342. This will help narrow down the problem.

4 - View the CLA PC when the project stops and view the assembly at that location.

5 - Single step through the CLA sqrt function to determine where things go wrong. 

Regards

Lori