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TMS320F28379D: Array definition in CLA

MUKUL CHOUDHURY
Intellectual 530 points
Part Number: TMS320F28379D


hi ,

I am defining an array in CLA  file. However, when I debug through ccs, the variable reads 0 in the watch window.

 float x[] = {1,2};

The x size is correct in CCS watch window but the values are 0.

Can we not use arrays inside CLA?

Thanks,

Mukul

  • 0
    TI__Mastermind 32655 points

    Hi Mukul,

    You can use arrays in CLA. I believe the issue is with the Expressions window, All the local variables in CLA tasks seems to be read as 0.

    Thank you for reporting it. I will report the issue to the CCS team

    As a workaround, please view the memory contents through the memory browser view

    Regards,

    Veena

  • +1
    Intellectual 690 points

    Hi Mukul,

    in CLA it is not possible to initialize a variable when declaring it (there is no memory section for initialized variables).
    The initialization must be done in a task that is called during system initialization, preferably in task 8 as it has the lowest priority.

    Regards,
    Jan

  • 0 in reply to jawe477
    Intellectual 530 points

    I was able to see array values in CLA when I declared and initialized arrays separately. But the same thing didn't hold true for single numbers. 

    Note, I am using local variables inside CLA task.

    For example , For the code below in CLA 

    float a = 5.6; // This worked and I was able to read value in CCS watch window correctly

    In case of arrays initialization at the time declaration didn't work.

    What is the reason for the above observation?

  • 0 in reply to MUKUL CHOUDHURY
    TI__Mastermind 32655 points

    Hi Mukul,

    Are you talking about global variables or local variables?

    In case of global variables, as Jan mentioned, it cannot be initialized during the declaration. But local variables can be initialized along with declaration

    For some reason, I am unable to reproduce the issue now. I am able to read the local variables under Expressions window

    Regards,

    Veena

  • 0 in reply to Veena Kamath
    Intellectual 530 points

    Hi Veena,

    I am talking about local variables. I tried using the array in one of the examples from TI. When I boot  from RAM, the initialization works during declaration. However , it does not work when I boot from flash.

    Thanks,

    Mukul

  • 0
    Intellectual 690 points

    Hi Mukul,

    maybe an error in your linker-command-file for flash?

    Regards,
    Jan

  • 0 in reply to jawe477
    Intellectual 530 points

    Hi,

    I am using TI example cla_ex1_asin. I didn't make any change in the command linker file . I had just added a dummy code in the cla task.

    here are the reproduction steps:

    1) Working Configuration: 

    Set in build configuration  CPU1_RAM as active and deploy code in hardware. I could see the array values in the ccs watch window.

    2) Not working Configuration

    Set in build configuration  CPU1_Flash as active and deploy code in hardware. I could not see the array values in the ccs watch window.

    Let me know if you need any more information to reproduce the issue, or is there something that I am dong wrong.

    Thanks,

    Mukul

  • +1 in reply to MUKUL CHOUDHURY
    TI__Mastermind 32655 points

    Hi Mukul,

    I think I found the issue. In case of Flash configuration, we are loading CLA const section in Flash and later copied to RAM. This copying is missing in the example.

    The following copies the CLAProg section. Similarly, you need to do the same for const_cla section as well.

    memcpy((uint32_t *)&Cla1funcsRunStart, (uint32_t *)&Cla1funcsLoadStart,
    (uint32_t)&Cla1funcsLoadSize);

    Regards,

    Veena