Original question:
如图所示可能会出现下管全置高的情况，且在计数值切换过程中也会存在问题
void DAB_SetupPWM_UpDownCount(const uint32_t base,
const uint32_t count_period,
const EPWM_SyncInPulseSource syncmode,
const uint32_t TBPHS,
const uint32_t CMPA,
const uint32_t CMPB,
const uint32_t red,
const uint32_t fed)
{
SysCtl_disablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);
EPWM_setPeriodLoadMode(base, EPWM_PERIOD_SHADOW_LOAD);
EPWM_setClockPrescaler(base, EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);
EPWM_setTimeBasePeriod(base, count_period);
EPWM_setTimeBaseCounter(base, 0U);
EPWM_setTimeBaseCounterMode(base, EPWM_COUNTER_MODE_UP_DOWN);
if(syncmode == EPWM_SYNC_IN_PULSE_SRC_DISABLE)
{
EPWM_disablePhaseShiftLoad(base);
SysCtl_setSyncOutputConfig(SYSCTL_SYNC_OUT_SRC_EPWM4SYNCOUT);
EPWM_setSyncOutPulseMode(base, EPWM_SYNC_OUT_PULSE_ON_COUNTER_ZERO);
SysCtl_setSyncInputConfig(SYSCTL_SYNC_IN_EPWM7, SYSCTL_SYNC_IN_SRC_EPWM4SYNCOUT);
}
else
{
EPWM_setSyncOutPulseMode(base, EPWM_SYNC_OUT_PULSE_ON_EPWMxSYNCIN);
EPWM_setCountModeAfterSync(base, EPWM_COUNT_MODE_DOWN_AFTER_SYNC);
EPWM_enablePhaseShiftLoad(base);
EPWM_setPhaseShift(base, TBPHS);
}
EPWM_setCounterCompareValue(base, EPWM_COUNTER_COMPARE_A, CMPA);
EPWM_setCounterCompareValue(base, EPWM_COUNTER_COMPARE_B, CMPB);
EPWM_setCounterCompareShadowLoadMode(base, EPWM_COUNTER_COMPARE_A, EPWM_COMP_LOAD_ON_SYNC_CNTR_ZERO);
EPWM_setCounterCompareShadowLoadMode(base, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_SYNC_CNTR_ZERO);
//EPWM_setCounterCompareShadowLoadMode(base, EPWM_COUNTER_COMPARE_A, EPWM_COMP_LOAD_ON_SYNC_CNTR_ZERO);
//EPWM_setCounterCompareShadowLoadMode(base, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_SYNC_CNTR_ZERO);
EPWM_setTripZoneAction(base, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW);
EPWM_setTripZoneAction(base, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW);
EPWM_forceTripZoneEvent(base, EPWM_TZ_FLAG_OST);
// EPWM_setActionQualifierShadowLoadMode(base, EPWM_ACTION_QUALIFIER_A, EPWM_AQ_LOAD_ON_CNTR_ZERO);
// EPWM_setActionQualifierShadowLoadMode(base, EPWM_ACTION_QUALIFIER_B, EPWM_AQ_LOAD_ON_CNTR_ZERO);
EPWM_setActionQualifierAction(base,EPWM_AQ_OUTPUT_A,
EPWM_AQ_OUTPUT_HIGH,
EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
EPWM_setActionQualifierAction(base,EPWM_AQ_OUTPUT_A,
EPWM_AQ_OUTPUT_LOW,
EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
EPWM_setActionQualifierAction(base,EPWM_AQ_OUTPUT_B,
EPWM_AQ_OUTPUT_HIGH,
EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);
EPWM_setActionQualifierAction(base,EPWM_AQ_OUTPUT_B,
EPWM_AQ_OUTPUT_LOW,
EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);
EPWM_setRisingEdgeDeadBandDelayInput(base, EPWM_DB_INPUT_EPWMA);
EPWM_setFallingEdgeDeadBandDelayInput(base, EPWM_DB_INPUT_EPWMB);
EPWM_setDeadBandDelayMode(base, EPWM_DB_RED, true);
EPWM_setDeadBandDelayMode(base, EPWM_DB_FED, true);
EPWM_setDeadBandDelayPolarity(base, EPWM_DB_RED, EPWM_DB_POLARITY_ACTIVE_HIGH);
EPWM_setDeadBandDelayPolarity(base, EPWM_DB_FED, EPWM_DB_POLARITY_ACTIVE_LOW);
EPWM_setRisingEdgeDelayCountShadowLoadMode(base, EPWM_RED_LOAD_ON_CNTR_PERIOD);
EPWM_setFallingEdgeDelayCountShadowLoadMode(base, EPWM_FED_LOAD_ON_CNTR_PERIOD);
EPWM_setRisingEdgeDelayCount(base, red);
EPWM_setFallingEdgeDelayCount(base, fed);
SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);
}
在有移相时会出现下管全置高的情况
