TMS320F280049: TIDM-02000例程中EPWM设置问题

    // CTR = PRD , set to 1
    //
    EPWM_setActionQualifierAction(base2, EPWM_AQ_OUTPUT_A ,
            EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);

    //
    // CTR = ZERO , set to 0
    //
    EPWM_setActionQualifierAction(base2, EPWM_AQ_OUTPUT_A ,
            EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    //
    // CTR = T1U , set to 1
    //
    EPWM_setActionQualifierAction(base2, EPWM_AQ_OUTPUT_A ,
            EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_T1_COUNT_UP);

    //
    // CTR = T1D , set to 0
    //
    EPWM_setActionQualifierAction(base2, EPWM_AQ_OUTPUT_A ,
            EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_T1_COUNT_DOWN);

    //设置EPWMB
    // CTR = PRD , set to 1
    //
    EPWM_setActionQualifierAction(base2, EPWM_AQ_OUTPUT_B ,
            EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);

    //
    // CTR = ZERO , set to 0
    //
    EPWM_setActionQualifierAction(base2, EPWM_AQ_OUTPUT_B ,
            EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    //
    // CTR = T1U , set to 1
    //
    EPWM_setActionQualifierAction(base2, EPWM_AQ_OUTPUT_B ,
            EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_T1_COUNT_UP);

    //
    // CTR = T1D , set to 0
    //
    EPWM_setActionQualifierAction(base2, EPWM_AQ_OUTPUT_B ,
            EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_T1_COUNT_DOWN);

    //
    // Set DCEVTFILT as the trigger source for Channel A设置DCEVT经过滤波后的事件作为触发源
    //
    EPWM_setActionQualifierT1TriggerSource(base2,
                                           EPWM_AQ_TRIGGER_EVENT_TRIG_DC_EVTFILT);

    //
    // Digital Compare and Comparator-X-Bar Configuration
    // Disable all the muxes first首先禁用trip5连接到MUX0上
    //
    XBAR_enableEPWMMux(XBAR_TRIP5, 0x00);//

    //
    // Setup PWM TRIP 5 as the destination for CMPSS1H output (PCMC)
    // Trip5 will be active if CMPSSH is active
    //
    XBAR_setEPWMMuxConfig(XBAR_TRIP5, XBAR_EPWM_MUX00_CMPSS1_CTRIPH);//设置复用器输入为CMPSS1H
    XBAR_enableEPWMMux(XBAR_TRIP5, XBAR_MUX00);//启用复用器

    //
    // DCAH = TRIP5 = Comparator 1H output
    //
    EPWM_selectDigitalCompareTripInput(base2, EPWM_DC_TRIP_TRIPIN5,
                                        EPWM_DC_TYPE_DCAH);//将trip5连接到DCAH上

    //
    // DCAH = high
    //
    EPWM_setTripZoneDigitalCompareEventCondition(base2, EPWM_TZ_DC_OUTPUT_A2,
                                                  EPWM_TZ_EVENT_DCXH_HIGH);//当输入为高时DCAH有效

    //
    // Set the source for digital compare filter as DCAEVT2设置DCAH连接到DCAECT2并经过滤波输出
    //
    EPWM_setDigitalCompareEventSource(base2, EPWM_DC_MODULE_A, EPWM_DC_EVENT_2,
                                       EPWM_DC_EVENT_SOURCE_FILT_SIGNAL);

    //
    // Allow ASYNC DCAEVT2 for trip zone actions设置DCAEVT2是否为同步信号
    //
    EPWM_setDigitalCompareEventSyncMode(base2, EPWM_DC_MODULE_A,
                                        EPWM_DC_EVENT_2,
                                        EPWM_DC_EVENT_INPUT_NOT_SYNCED);//设置为不同步

    //
    // Select DCAEVT2 cycle by cycle trip设置DCAEVT2为周期脱开信号
    //
    EPWM_enableTripZoneSignals(base2, EPWM_TZ_SIGNAL_DCAEVT2);

    //
    // Event Filtering Configuration (inside digital compare)事件滤波设置
    // Enable DC filter blanking window
    //
    EPWM_enableDigitalCompareBlankingWindow(base2);//使能消隐窗口

    //
    // Set the signal source that will be filtered.
    //
    EPWM_setDigitalCompareFilterInput(base2, EPWM_DC_WINDOW_SOURCE_DCAEVT2);//使能滤波

    //
    // Set the Digital Compare filter blanking pulse.
    //
    EPWM_setDigitalCompareBlankingEvent(base2,
                                     EPWM_DC_WINDOW_START_TBCTR_ZERO_PERIOD);//当计数为0或者PRD时进行消隐

    //
    // Set the blanking window offset in TBCLK counts
    //
    EPWM_setDigitalCompareWindowOffset(base2, pwm_period_ticks - 5);//设置消隐窗口延时

    //
    // Set the blanking window length in TBCLK counts
    //
    EPWM_setDigitalCompareWindowLength(base2, 10);//设置消隐窗口长度

    //
    // Trip-zone event actions
    // What do we want the CBC events to do?
    // TZAx events can force EPWMxA
    // TZBx events can force EPWMxB
    //
    EPWM_setTripZoneAdvAction(base2, EPWM_TZ_ADV_ACTION_EVENT_TZA_D,
                              EPWM_TZ_ADV_ACTION_LOW);
    EPWM_setTripZoneAdvAction(base2, EPWM_TZ_ADV_ACTION_EVENT_TZA_U,
                              EPWM_TZ_ADV_ACTION_DISABLE);
    EPWM_setTripZoneAdvAction(base2, EPWM_TZ_ADV_ACTION_EVENT_TZB_U,
                              EPWM_TZ_ADV_ACTION_LOW);
    EPWM_setTripZoneAdvAction(base2, EPWM_TZ_ADV_ACTION_EVENT_TZB_D,
                              EPWM_TZ_ADV_ACTION_DISABLE);
    EPWM_setTripZoneAction(base2, EPWM_TZ_ACTION_EVENT_TZA,
                           EPWM_TZ_ACTION_DISABLE);
    EPWM_setTripZoneAction(base2, EPWM_TZ_ACTION_EVENT_TZB,
                           EPWM_TZ_ACTION_DISABLE);

    //
    // Select CBC clear event设置周期脱开事件标志位清除
    //
    EPWM_selectCycleByCycleTripZoneClearEvent(base2,
                           EPWM_TZ_CBC_PULSE_CLR_CNTR_ZERO_PERIOD);//计数为0以及PRD时清除

    //
    // Clear any spurious trip清除脱开标志位
    //
    EPWM_clearTripZoneFlag(base1, (EPWM_TZ_INTERRUPT_OST |
            EPWM_TZ_INTERRUPT_DCAEVT2 | EPWM_TZ_SIGNAL_DCBEVT1));
    EPWM_clearTripZoneFlag(base2, (EPWM_TZ_INTERRUPT_OST |
            EPWM_TZ_INTERRUPT_DCAEVT2 | EPWM_TZ_SIGNAL_DCBEVT1));