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MCF8329RRYEVM: Motorstudio: Read Register either not displayed or not working correctly

Manuel Deuerling
Prodigy 50 points
Part Number: MCF8329RRYEVM
Other Parts Discussed in Thread: MOTORSTUDIO

Tool/software:

Dear TI-experts,

I have the issue that the read register for e.g. the CURRENT_LOOP_KP are not displaying what I am writing. For other values, e.g. CSA_GAIN_FEEDBACK it works.

I dont know if it is a display error in Motorstudio or if the read registers do not work or if the write registers do not work. Do you know what the issue is or what I am doing wrong?

Best regards,

Manuel

  • +1
    TI__Expert 3025 points

    Hi Manuel,

    Current loop constants (CURRENT_LOOP_KP and CURRENT_LOOP_KI) displayed in CURRENT_PI register are automatically calculated by device using motor phase resistance and inductance that are mentioned in the CLOSED_LOOP2->MOTOR_IND and CLOSED_LOOP2->MOTOR_RES register bits field.

    After you change the motor resistance/inductance value, please click on read register button to get the updated value from CURRENT_PI register.

    Current loop constants bit field that are present in CLOSED_LOOP3 register provided for user configurability; you can change those values based on your loop bandwidth requirements. 

    Thanks,

    Dhinesh

  • 0 in reply to Dhinesh
    Prodigy 50 points

    Thanks Dhinesh.

    This works. I did not know these buttons and up to now I did not need to click read/write but CURRENT_LOOP_KP and CURRENT_LOOP_KI were the only not updated automatically.