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DLOG_4CH_buff1 cannot load from non-primitive location

Jingzhe Wu
Intellectual 720 points

Hi,

I am using F28027 Piccollo Launchpad for a motor application. I now wish to observe the data I stored in data log by plotting in the CCS graph tool. However, from the watch window, it says *(DLOG_4CH_buff1)  cannot load from non-primitive location. What does this mean? How can I solve this?

Thank you.

Jingzhe

  • 0
    Genius 4925 points

    Hi,

    This message means, that you are trying to display a non primitive variable. What data type did you attach to the DLOG module? is it a struct maybe?

    BR Andreas

  • 0 in reply to andreas von kaenel
    Intellectual 720 points

    Hi Andeas,

    I indeed try to output a structure member to data log. The data type of the structure member is _iq. Before entering data log, it is converted to suit data log data type by (unit16)_IQtoIQ15. I think it is proper data log type. Can't see why it is not a primitive data type.

    Thanks.

    Jingzhe

  • 0 in reply to Jingzhe Wu
    Genius 4925 points

    How did you assign the data to the log module? did you just cast the struct member? I would recommend to cast the data into a suitable variable first and then attach this variable to the log module.

    Andreas

  • 0 in reply to andreas von kaenel
    Intellectual 720 points

    Hi Andreas,

    You are right. I just cast the structure member to data log. Probably I should cast the value to a variable and then data log it.

    My solution is to create a buffer array myself and store relevant values into array during every interrupt, and it works fine.

    Thank you.

    Jingzhe