TMS320F280049C: PHASE SHIFT BETWEEN TWO PULSES

Hello,

You need to enable phase shift using the EPWM_enablePhaseShiftLoad function for phase shifting to be used.

I don't see anything in your code that would configure dead-band, are you wanting to use dead-band on your EPWM outputs?

Thank you,

Luke

/*
 * pwm.h
 *
 *  Created on: 03-Jun-2023
 *      Author: Deepti
 */

#ifndef PWM_H_
#define PWM_H_
#include "driverlib.h"
#include "device.h"
//#include "board.h"

// Declaration
#define EPWM4_TIMER_TBPRD    5000UL
#define EPWM5_TIMER_TBPRD    5000UL
#define EPWM6_TIMER_TBPRD    5000UL
#define EPWM8_TIMER_TBPRD    5000UL


// function prototype
void initEPWM4(void);
void initEPWM5(void);
void initEPWM6(void);
void initEPWM8(void);

// PWM4 FUNCTION CALLED
void initEPWM4()
{
    // Set-up TBCLK

    EPWM_setTimeBasePeriod(EPWM4_BASE, EPWM4_TIMER_TBPRD);

    // SYNC OUT EVENT

   EPWM_setSyncOutPulseMode(EPWM4_BASE,EPWM_SYNC_OUT_PULSE_ON_COUNTER_ZERO);
    //EPWM_setPhaseShift(EPWM4_BASE, 0U);
    EPWM_setTimeBaseCounter(EPWM4_BASE, 0U);


    // SYNC EVENT
    //EPWM_setCountModeAfterSync(EPWM4_BASE, EPWM_COUNT_MODE_DOWN_AFTER_SYNC);

        // Set Compare values
        EPWM_setCounterCompareValue(EPWM4_BASE,EPWM_COUNTER_COMPARE_A,2500);
        EPWM_setCounterCompareValue(EPWM4_BASE, EPWM_COUNTER_COMPARE_B,0);

    // Set up counter mode

    EPWM_setTimeBaseCounterMode(EPWM4_BASE, EPWM_COUNTER_MODE_UP_DOWN);
    EPWM_disablePhaseShiftLoad(EPWM4_BASE);
    EPWM_setClockPrescaler(EPWM4_BASE,EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);

        // Set up shadowing

    EPWM_setCounterCompareShadowLoadMode(EPWM4_BASE, EPWM_COUNTER_COMPARE_A,EPWM_COMP_LOAD_ON_CNTR_ZERO);
    EPWM_setCounterCompareShadowLoadMode(EPWM4_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_CNTR_ZERO);

       // Set actions

    EPWM_setActionQualifierAction(EPWM4_BASE,EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_HIGH,EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(EPWM4_BASE,EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

}

      // PWM5 FUNCTION CALLED
void initEPWM5()
{
      // Set-up TBCLK

    EPWM_setTimeBasePeriod(EPWM5_BASE, EPWM5_TIMER_TBPRD);
    EPWM_setTimeBaseCounter(EPWM5_BASE, 0U);

    // SYNC EVENT
    EPWM_setCountModeAfterSync(EPWM5_BASE, EPWM_COUNT_MODE_DOWN_AFTER_SYNC);

    // PHASE SHIFT VALUE

    EPWM_setPhaseShift(EPWM5_BASE, 2000U);
    EPWM_enablePhaseShiftLoad(EPWM5_BASE);

    //
  //  EPWM_setSyncOutPulseMode(EPWM5_BASE,EPWM_SYNC_OUT_PULSE_ON_EPWMxSYNCIN);

     // Set Compare values

    EPWM_setCounterCompareValue(EPWM5_BASE,EPWM_COUNTER_COMPARE_A,2500U);
    EPWM_setCounterCompareValue(EPWM5_BASE, EPWM_COUNTER_COMPARE_B,0U);

    // Set up counter mode

    EPWM_setTimeBaseCounterMode(EPWM5_BASE, EPWM_COUNTER_MODE_UP_DOWN);
    EPWM_setClockPrescaler(EPWM5_BASE,EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);

   // Set up shadowing

    EPWM_setCounterCompareShadowLoadMode(EPWM5_BASE, EPWM_COUNTER_COMPARE_A,EPWM_COMP_LOAD_ON_CNTR_ZERO);
    EPWM_setCounterCompareShadowLoadMode(EPWM5_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_CNTR_ZERO);

   // Set actions

    EPWM_setActionQualifierAction(EPWM5_BASE,EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_HIGH,EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(EPWM5_BASE,EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW,EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
}

   // PWM6 FUNCTION CALLED

void initEPWM6()
{

    // Set-up TBCLK

    EPWM_setTimeBasePeriod(EPWM6_BASE, EPWM6_TIMER_TBPRD);

    // SYNC OUT EVENT

    EPWM_setSyncOutPulseMode(EPWM4_BASE,EPWM_SYNC_OUT_PULSE_ON_COUNTER_ZERO);
    //EPWM_setPhaseShift(EPWM6_BASE, 0U);
    EPWM_setTimeBaseCounter(EPWM6_BASE, 0U);

    // Set Compare values

    EPWM_setCounterCompareValue(EPWM6_BASE,EPWM_COUNTER_COMPARE_A,2500);
    EPWM_setCounterCompareValue(EPWM6_BASE, EPWM_COUNTER_COMPARE_B,0);

    // Set up counter mode

    EPWM_setTimeBaseCounterMode(EPWM6_BASE, EPWM_COUNTER_MODE_UP_DOWN);
    EPWM_disablePhaseShiftLoad(EPWM6_BASE);
    EPWM_setClockPrescaler(EPWM6_BASE,EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);

    // Set up shadowing

    EPWM_setCounterCompareShadowLoadMode(EPWM6_BASE, EPWM_COUNTER_COMPARE_A,EPWM_COMP_LOAD_ON_CNTR_ZERO);
    EPWM_setCounterCompareShadowLoadMode(EPWM6_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_CNTR_ZERO);

    // Set actions

    EPWM_setActionQualifierAction(EPWM6_BASE,EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_HIGH,EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(EPWM6_BASE,EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW,EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

}

   // PWM7 FUNCTION CALLED
void initEPWM8()
{
      // Set-up TBCLK

    EPWM_setTimeBasePeriod(EPWM8_BASE, EPWM8_TIMER_TBPRD);
    EPWM_setTimeBaseCounter(EPWM8_BASE, 0U);

    // SYNC EVENT
    EPWM_setCountModeAfterSync(EPWM8_BASE, EPWM_COUNT_MODE_DOWN_AFTER_SYNC);

    // PHASE SHIFT VALUE

    EPWM_setPhaseShift(EPWM8_BASE, 2000U);
    EPWM_enablePhaseShiftLoad(EPWM8_BASE);

    //
  //  EPWM_setSyncOutPulseMode(EPWM5_BASE,EPWM_SYNC_OUT_PULSE_ON_EPWMxSYNCIN);

     // Set Compare values

    EPWM_setCounterCompareValue(EPWM8_BASE,EPWM_COUNTER_COMPARE_A,2500U);
    EPWM_setCounterCompareValue(EPWM8_BASE, EPWM_COUNTER_COMPARE_B,0U);

    // Set up counter mode

    EPWM_setTimeBaseCounterMode(EPWM8_BASE, EPWM_COUNTER_MODE_UP_DOWN);
    EPWM_setClockPrescaler(EPWM8_BASE,EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);

   // Set up shadowing

    EPWM_setCounterCompareShadowLoadMode(EPWM8_BASE, EPWM_COUNTER_COMPARE_A,EPWM_COMP_LOAD_ON_CNTR_ZERO);
    EPWM_setCounterCompareShadowLoadMode(EPWM8_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_CNTR_ZERO);

   // Set actions

    EPWM_setActionQualifierAction(EPWM8_BASE,EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_HIGH,EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
    EPWM_setActionQualifierAction(EPWM8_BASE,EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW,EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
}


#endif  PWM_H_

as per the program i am getting the phase shift for EPWM5, but EPWM 8 is coming in phase with EPWM4,6 eventhough phase shift function is given. i had enclosed the code for the same.