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LAUNCHXL-F2800137: SYSCONFIG

HONGTAO WANG
Prodigy 20 points
Part Number: LAUNCHXL-F2800137
Other Parts Discussed in Thread: SYSCONFIG

Hi,

I get two problems when I use SYSCONFIG to develop firmware for LAUNCHXL-F2800137. One is there is no EPWM pulse on the PWMA/B pins when I use SYSCONFIG to add an EPWM in my new project. Another is, in an existing example project, I set the EPWM event-trigger, but the interrupt is just executed once. Could you guide how to use SYSCONFIG to set an EPWM event-trigger so that the interrupt is performed for each EPWM pulse?

Thanks and regards,

Hongtao

  • 0
    TI__Genius 17571 points

    Hi Hongtao,

    Can you provide the configuration you are using to which you are not seeing the PWM signals being output? Then I can try to debug it.

    For the interrupt, please ensure you are properly acknowledging the interrupt and clearing any interrupt flags

    Regards,

    Peter 

  • 0 in reply to Peter Luong1
    Prodigy 20 points

    Hi Peter,

    The EPWM_Init() in the generated source 'board.c' is listed as the following.

    void EPWM_init(){
    EPWM_setClockPrescaler(theDriverPulsePWM_BASE, EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);
    EPWM_setTimeBasePeriod(theDriverPulsePWM_BASE, 120);
    EPWM_setTimeBaseCounter(theDriverPulsePWM_BASE, 0);
    EPWM_setTimeBaseCounterMode(theDriverPulsePWM_BASE, EPWM_COUNTER_MODE_UP_DOWN);
    EPWM_disablePhaseShiftLoad(theDriverPulsePWM_BASE);
    EPWM_setPhaseShift(theDriverPulsePWM_BASE, 0);
    EPWM_setCounterCompareValue(theDriverPulsePWM_BASE, EPWM_COUNTER_COMPARE_A, 60);
    EPWM_setCounterCompareShadowLoadMode(theDriverPulsePWM_BASE, EPWM_COUNTER_COMPARE_A, EPWM_COMP_LOAD_ON_CNTR_ZERO);
    EPWM_setCounterCompareValue(theDriverPulsePWM_BASE, EPWM_COUNTER_COMPARE_B, 0);
    EPWM_setCounterCompareShadowLoadMode(theDriverPulsePWM_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_CNTR_ZERO);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);
    EPWM_setDeadBandDelayMode(theDriverPulsePWM_BASE, EPWM_DB_RED, true);
    EPWM_setRisingEdgeDelayCount(theDriverPulsePWM_BASE, 20);
    EPWM_setDeadBandDelayMode(theDriverPulsePWM_BASE, EPWM_DB_FED, true);
    EPWM_setFallingEdgeDelayCount(theDriverPulsePWM_BASE, 20);
    }

    Best regards,

    Hongtao

  • 0 in reply to HONGTAO WANG
    TI__Genius 17571 points

    Hi Hongtao,

    Thank you for providing your specific configuration. 

    HONGTAO WANG said:
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);
    EPWM_setActionQualifierAction(theDriverPulsePWM_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);

    Upon inspecting the code, it appears you are not configuring any of the action qualifiers. You will need to configure the action qualifier depending on what you want the EPWM output to be.

    Assuming you are wanting a 50% duty cycle output on EPWMA, you should configure the A output to set high on CMPA on count up and clear low on CMPA on count down.

    Regards,

    Peter