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Original question:

Compiler/TMS320F280049: Call to cosf() crashes in CLA

Compiler/TMS320F280049: CLACos/sin erroneous results

DTruex
Intellectual 790 points
Part Number: TMS320F280049
Other Parts Discussed in Thread: C2000WARE

Tool/software: TI C/C++ Compiler

CLACos() and CLASin() functions are both returning results along the line of +-1.0e+9.  The values do change slightly depending on the input but a stay in the same order of magnitude for all inputs -2pi to +2pi.

I'm assuming I don't have something loaded correctly.

The CLAcos/sin location along with the tables are shown below from the .map file:

And here is the search path:

not sure what I am overlooking.  

Thanks

  • 0
    Intellectual 790 points

    Here is the code snippet that is running in CLATask2.  Task 2 is triggered in c2000 software at 1kHz.

    And a plot of the results:

  • 0 in reply to DTruex
    Intellectual 790 points

    FWIW the CLAsincos() function works as expected.

    generates this output:

  • 0 in reply to DTruex
    TI__Guru* 92230 points

    DTruex,

    Have you tried running the C2000Ware example for CLACos on the F28004x?  There is a FLASH build configuration as well as a RAM build configuration.  Comparing this to your implementation would provide clues as to where things have gone wrong. 

    C:\ti\c2000\C2000Ware_<version>\libraries\math\CLAmath\c28\examples\cos

    Regards

    Lori

  • 0 in reply to Lori Heustess
    TI__Guru* 92230 points

    Note: due to holidays in the US next week, responses may be delayed. 

    Hi Dtruex,

    I haven’t heard from you for a few days, so I hope this helped answer your question or you were able to resolve the issue.  

    Please click the green "Verified Answer" button if the issue is resolved.

    If this isn’t the case, please click the "This did NOT resolve my issue" button and reply to this thread with more information.

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    Regards,
    Lori

  • 0 in reply to Lori Heustess
    Intellectual 790 points

    Lori,

    Since the CLAsincos() function works in my firmware this has lost a bit of urgency.  I did confirm the example CLAcos() function provided works as expected running from RAM or FLASH.  There are a number of differences in the xx_lnk.cmd files in need to sort through (this project is based on an example from an earlier revision of  C2000Ware), I just haven't had time.

    Given that I have a project that works as expected I should be able to track down the problem.  Thanks for your help.  

  • 0 in reply to DTruex
    TI__Guru* 92230 points

    Thank you for the feedback!  I will close this thread.