TMS320F280049: Count up_down problem with EPWMB

Luis,

I've assigned your post to the subject matter expert, but due to US Holiday, please expect our response by the end of day Monday.

Best,
Matthew

This should be due to ACTION PRIORITY. Can you check the table in the TRM for the actions with different priorities.

Alternatively you can set all of the actions for: EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO and EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD to be the
DO NOTHING action option.

Hi Nima,

thanks for your reply, but this does not solve the problem:

    // ePWMA High when TBCTR=0
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_A,
     EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    // ePWMA Low when up count TBCTR=CMPA
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_A,
     EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

    // ePWMA High when down count TBCTR=CMPA
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_A,
     EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

    // ePWMB Low when TBCTR=0
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_B,
     EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    // ePWMB High when up count TBCTR=CMPA
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_B,
     EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

    // ePWMB Low when down count TBCTR=CMPA
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_B,
     EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

    ///////////// check this out!!!!! if this helps!!!
    // ePWMB Low when down count TBCTR=PERIOD
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_B,
      EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);

I´m not sure what can it be... Even I was thinking on the Deadtime but this has higher value as specified, so it´s not.

Thanks!

BR,

Luis

Sorry, I missundertood.

Do you mean like this?

    // ePWMA NO CHANGE when TBCTR=0
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_A,
      EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    // ePWMA Low when up count TBCTR=CMPA
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_A,
     EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

    // ePWMA High when down count TBCTR=CMPA
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_A,
     EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

    // ePWMB NO CHANGE when TBCTR=0
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_B,
      EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    // ePWMB High when up count TBCTR=CMPA
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_B,
     EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

    // ePWMB Low when down count TBCTR=CMPA
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_B,
     EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

    // ePWMB NO CHANGE when down count TBCTR=PERIOD
    EPWM_setActionQualifierAction(EPWM_BASE[pwm], EPWM_AQ_OUTPUT_B,
      EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);

I will try it on Monday :) 

Thanks

Yes! Try that!

Nima

Also Luis, if you have C2000Ware 4.01, then use the SysConfig Tool!

www.ti.com/.../spracx3.pdf

Sorry, but the problem persists... 

Can you try setting CMPB actions for OUTPUT_A to NO change and vice versa?

Nima

Hello Nima,

I was doing several tests and then I realized that the problem is when I use the HRPWM module and not with normal EPWM...

  // Calibrate MEP_ScaleFactor
  do {
      sfoStatus = SFO();
  } while(sfoStatus == SFO_INCOMPLETE);

  //#MEP steps per coarse step at 180ps(10n/180ps) MEP_scaleFactor=55
  HRPWM_setMEPStep(base, MEP_ScaleFactor);

  // HRCAL uses the EPWM1 clock
  SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM1);

  // Turn off high-resolution period control, as we do only duty control.
  HRPWM_disablePhaseShiftLoad(base); //--> Enable this for Phase shift load (DAB)

  HRPWM_setMEPControlMode(base, HRPWM_CHANNEL_A,
    HRPWM_MEP_DUTY_PERIOD_CTRL);
  // MEP control on both edges. For channel A
  HRPWM_setMEPEdgeSelect(base, HRPWM_CHANNEL_A,
    HRPWM_MEP_CTRL_RISING_AND_FALLING_EDGE);
  HRPWM_setCounterCompareShadowLoadEvent(base,
    HRPWM_CHANNEL_A, HRPWM_LOAD_ON_CNTR_ZERO_PERIOD);

  //Setting of comparator, phase and deadband HR-modes
  HRPWM_setCounterCompareValue(base, HRPWM_COUNTER_COMPARE_A, 0);

  HRPWM_enableAutoConversion(base);

  HRPWM_enablePeriodControl(base); //-->Enable this for Duty cycle load (Buck/AC/DC)

  //synchronization pulse input
  HRPWM_setSyncPulseSource(base, HRPWM_PWMSYNC_SOURCE_ZERO);

When I initialize the HRPWM in this way, then I get that problem...

Are you using the SFO library?

Hello, 

Yes, I´m using it.