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TMS320F280049: About register protections during CLA tasks execution

Pengyuan Chen
Prodigy 10 points
Part Number: TMS320F280049

Hello, 

        I have a general question regarding register protections when low priority CLA tasks got interrupts by other CLA tasks. The chip is F28004x/F28003x series. Is there some examples how to protect registers when CLA tasks alternates. Just try to avoid malfunction of CLA. Please advise. Thank you. 

Best regards,

Pengyuan

  • 0
    TI__Mastermind 32375 points

    Hi,

    Do you mean the CLA core registers or peripheral registers?

    Regards,

    Veena

  • 0 in reply to Veena Kamath
    Prodigy 10 points

    Hello Veena,

    Thank you for following up. I mean the CLA core registers. For a scenario, I am using task 8 as background task. If any other task (1~7) interrupt the background task 8, will calculation results or status of task 8 (prior to the interrupt) will be automatically stored in CLA core registers or somewhere else? Will those parameters will be automatically restored after the interruption complete. Or, it has to be manually operate (store/load).  In this case, do you have any example? Thank you.

    Best regards,

    Pengyuan

  • 0 in reply to Pengyuan Chen
    TI__Mastermind 32375 points

    Please make sure you have enabled CLA background task in the project compiler settings.

    This will make compiler insert the required register context and save and restore instructions

    Regards,

    Veena

  • 0 in reply to Veena Kamath
    Prodigy 10 points

    Hello Veena,

    Thank you for the information. I am trying to understand precisely. So assuming that I enable the CLA background task in settings, the temporary information in registers used by task 8 (background task) will be automatically stored and restored when other tasks (1~7) interrupt the task 8 or complete the executions. Is that correct? Thank you again.

    Best regards,

    Pengyuan 

  • 0 in reply to Veena Kamath
    Prodigy 10 points

    Hello Veena,

    Thank you for the information. I am trying to understand precisely. So assuming that I enable the CLA background task in settings, the temporary information in registers used by task 8 (background task) will be automatically stored and restored when other tasks (1~7) interrupt the task 8 or complete the executions. Is that correct? Thank you again.

    Best regards,

    Pengyuan 

  • +1 in reply to Pengyuan Chen
    TI__Mastermind 32375 points

    Yes, Compiler inserts the register save and restore instructions at the start and end of the tasks.

    Reagrds,

    Veena

  • 0 in reply to Veena Kamath
    Prodigy 10 points

    Hello Veena,

    Thank you so much for the confirmation.

    Best regards,

    Pengyuan

  • 0 in reply to Veena Kamath
    Prodigy 10 points

    Hello Kamath,

    May I have another question? Is there any disassembly code/examples can show what happens when the CLA restores resistors used by task8 after the interrupt (task1~7 for example) is completed. Just try to understand the mechanism since the CLA does not have stack. Thank you so much.

    Best regards,

    Pengyuan

  • 0 in reply to Pengyuan Chen
    TI__Mastermind 32375 points

    Hi,

    You can enable the following compiler flag which will retain the generated assembly file in the build folder

    You may find the .asm file corresponding to every .c and .cla file

    CLA tasks also has stack and is part of scratchpad section

    Regards,

    Veena