TMS320F28388D: Something is missing in the CLAmath library in C2000Ware 4.01 - the CLA FFT routines don't work in EABI

Hi Andy,

Thank you for catching this, indeed the EABI symbols are missing. Here are the steps to get you unblocked.

1. Add the following to the CLAeabi.asm:

;
; FFT
;
.asg CLA_CFFT_run256Pt, _CLA_CFFT_run256Pt
.asg cla_twiddleFactors, _cla_twiddleFactors
.asg cla_bitReversalTable, _cla_bitReversalTable
.asg CLA_CFFT_unpack256Pt, _CLA_CFFT_unpack256Pt
.asg IOBuffer, _IOBuffer
.asg IOBuffer2, _IOBuffer2

2. Import the CLAmath library project: <C2000Ware>\libraries\math\CLAmath\c28\ccs\cla_type2\cla2_math_library.projectspec

3. Right click on cla2_math_library, Build Configurations -> Set Active -> CLAMATHLIB_STD_EABI

4. Right click on cla2_math_library, Properties -> General. Change output format from legacy COFF to EABI

5. Build project. This will update the library in <C2000Ware>\libraries\math\CLAmath\c28\lib

6. Rebuild your application while linking to "cla2_math_library_eabi/lib".

Let me know if you are still facing issues. We will get this fixed in the next C2000Ware release.

AndyP said:

And also, I forgot to mention, in the CLAmath manual there are no usage instructions for RFFT and Unpack routines

Regarding this question, what specific information are you looking for?

Thanks,

Ashwini

Hi Ashwini,

I tried with the steps you give, but still the error remains. Maybe I do something wrong. I tried compiling the examples in C2000Ware (there are five of them, all for F2837x and CLA type 1) in EABI mode, but with no success. There appear also some new warnings that needs fixes. I think TI have to test all of the examples in EABI mode and when it will be working update all the files in the new C2000Ware. 

Regarding the manual question: the remaining routines (RFFT and unpack) should be included just like the rest. Not only for completeness, but to decribe the requirements for input and output buffers (for example: there is no mention in the manual of the IOBuffer2, no mention that the unpack is off-place routine, etc.) This information is given in the assembly source files only.

Regards,
Andy

Hi Andy,

AndyP said:

I tried with the steps you give, but still the error remains. Maybe I do something wrong. I tried compiling the examples in C2000Ware (there are five of them, all for F2837x and CLA type 1) in EABI mode, but with no success. There appear also some new warnings that needs fixes. I think TI have to test all of the examples in EABI mode and when it will be working update all the files in the new C2000Ware. 

The E2E was tagged with TMS320F28388D, which uses a CLA type 2. For F2837x its CLA Type 1. In the steps above, please use the projectspec: <C2000Ware>\libraries\math\CLAmath\c28\ccs\cla_type1\cla1_math_library.projectspec.

AndyP said:

Regarding the manual question: the remaining routines (RFFT and unpack) should be included just like the rest. Not only for completeness, but to decribe the requirements for input and output buffers (for example: there is no mention in the manual of the IOBuffer2, no mention that the unpack is off-place routine, etc.) This information is given in the assembly source files only.

Thanks for the good feedback. We will add this to our documentation.

Thanks,
Ashwini

Hi Ashwini,

Ashwini Athalye said:

In the steps above, please use the projectspec: <C2000Ware>\libraries\math\CLAmath\c28\ccs\cla_type1\cla1_math_library.projectspec.

Off course I've selected the appropriate project and library. I tried all five examples and different build configurations.
Did you manage the compile one of the examples in EABI? 

Regards,
Andy

One more question regarding alignment requirements for IOBuffer and IOBuffer2.
1. The manual states:

"The FFT buffer must be aligned to a 12-bit address, usually the starting address of one of
the CLA data RAMs."

But the comment in the main.c of the cla_rfft_xxx example says something different:

"The input is placed in a section IOBuffer that needs to be aligned to the size of the input in words to allow the
bit reverse addressing in stage 1 of the FFT to work properly."

Which one is correct?

2. Is there any alignment requirement for IOBuffer2 ?

Regards,
Andy

Hi Andy, I will ask the experts and get back to you.

Thanks,
Ashwini

AndyP said:

The missing piece was adding the line:

Fullscreen

Ah yes, I apologize, I missed listing this step in my post above.

Hi Andy,

The Expert is out of office for a week. I looked at the map file of the example and IOBuffer2 does not seem to have a 12-bit alignment requirement, it only needs to be word aligned as it is an array of 32-bit floats. For example I looked at, in the map file, IOBuffer2 starts at address 0x9404.

For now, please consider that the IOBuffer needs to be aligned to 12-bit address. I will confirm again next week once the expert is back.

Thanks,

Ashwini