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CCS/TMS320F280041C: Set Action Qualifier SW Force Action

Luis Alfonso Fernandez Serantes
Prodigy 170 points
Part Number: TMS320F280041C

Tool/software: Code Composer Studio

Hello,

I want to many PWM signals and at one point I just want to disable or set the output of one of them to low, both A and B, and after a while turn them on again. I was trying to do it with the following function to set them to low state:

EPWM_setActionQualifierContSWForceAction(PSFB2_DRV_EPWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_SW_OUTPUT_LOW);

EPWM_setActionQualifierContSWForceAction(PSFB2_DRV_EPWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_SW_OUTPUT_LOW);

And the "EPWM_AQ_SW_DISABLED" parameter to restore the operation. As far as I have done, it is working but I have a problem with setting them to low...

The PWM_A goes to low but the PWM_B goes to high, so they work kind of inverted... could you help me to solve this?

Thank you very much.

BR,

Luis

  • 0
    TI__Guru 52020 points

    Is the deadband module with complimentary output enabled?

    Is there any other actions you have for the SW force somewhere else in the code?

  • 0 in reply to Nima Eskandari
    Prodigy 170 points

    Hi Nima,

    Yes, you are right, the deadband is creating a complementary PWM. When I disable the deadband, the PWM is working fine. How can I do so this doesn´t happen and I still can keep the deadband...?

    The deadband is configured as following:

    EPWM_setDeadBandDelayMode(PWMbase, EPWM_DB_RED, true);
    EPWM_setDeadBandDelayMode(PWMbase, EPWM_DB_FED, true);

    EPWM_setRisingEdgeDeadBandDelayInput(PWMbase, EPWM_DB_INPUT_EPWMA);
    EPWM_setFallingEdgeDeadBandDelayInput(PWMbase, EPWM_DB_INPUT_EPWMA);

    EPWM_setDeadBandDelayPolarity(PWMbase, EPWM_DB_FED, EPWM_DB_POLARITY_ACTIVE_LOW);
    EPWM_setDeadBandDelayPolarity(PWMbase, EPWM_DB_RED, EPWM_DB_POLARITY_ACTIVE_HIGH);

    EPWM_setFallingEdgeDelayCount(PWMbase, PSFB_EPWM_DEADBAND_FED);
    EPWM_setRisingEdgeDelayCount(PWMbase, PSFB_EPWM_DEADBAND_RED);


    And no, there aren't any other actions on the SW force, just the way to set the shadow more:

    EPWM_setActionQualifierContSWForceShadowMode(PWMbase , EPWM_AQ_SW_IMMEDIATE_LOAD);


    Thank you!

  • 0 in reply to Luis Alfonso Fernandez Serantes
    TI__Guru 52020 points

    Can you use the TripZone module/DC module? I believe they take affect AFTER the deadband module.