你好，我在配置PWM时发现一个问题，模式是UP_DOWN,只用了CMPA确定上升沿及下降沿，我需要在占空比0-95%之间都需要开启PWM，目前使用示波器观测发现当占空比为0%的时候没有发波的我想问一下原因，及如何更改可以在占空比为0时也可以发波
EPWM_setPeriodLoadMode(base1, EPWM_PERIOD_SHADOW_LOAD);
EPWM_setTimeBasePeriod(base1, 750);
EPWM_setTimeBaseCounter(base1, 0);
EPWM_setPhaseShift(base1, 0);
EPWM_setTimeBaseCounterMode(base1, EPWM_COUNTER_MODE_UP_DOWN);
EPWM_setClockPrescaler(base1, EPWM_CLOCK_DIVIDER_1, EPWM_HSCLOCK_DIVIDER_1);
//
// Counter Compare Submodule Registers
//
EPWM_setCounterCompareValue(base1, EPWM_COUNTER_COMPARE_A,
375);
// EPWM_setCounterCompareValue(base1, EPWM_COUNTER_COMPARE_B,
// 188);
EPWM_setCounterCompareShadowLoadMode(base1, EPWM_COUNTER_COMPARE_A,
EPWM_COMP_LOAD_ON_CNTR_ZERO);
// EPWM_setCounterCompareShadowLoadMode(base1, EPWM_COUNTER_COMPARE_B,
// EPWM_COMP_LOAD_ON_CNTR_ZERO);
//
// to start don't configure the PWM to do anything
//
HWREGH(base1 + EPWM_O_AQCTLA) = 0;
//****PWMA ACTR output
//
// CTR = ZERO , set to 0
//
EPWM_setActionQualifierAction(base1, EPWM_AQ_OUTPUT_B ,
EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);
//
// CTR = PRD , set to 1
//
EPWM_setActionQualifierAction(base1, EPWM_AQ_OUTPUT_B ,
EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);
//
// CTR = PRD , set to 1
//
EPWM_setActionQualifierAction(base1, EPWM_AQ_OUTPUT_B ,
EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);
//
// CTR = ZERO , set to 0
//
EPWM_setActionQualifierAction(base1, EPWM_AQ_OUTPUT_B ,
EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);
