The codes below are placed in ePWM1 ISR since ePWM1 provides the driving signals for PFC MOSFET. ePWM1 ISR occurs every TB counter=0.

//Set bit 1 (VCAPSTART), software trigger source of edge filter
EPWM_startValleyCapture(EPWM1_BASE);
//DCCAP
capturedPeriod = EPWM_getDigitalCompareCaptureCount(EPWM1_BASE);
// blankingWindowLength=50~70 ticks margin + duty*DCCAP (MOSFET on-time)
blankingWindowLength = blankingBsuffer+ePwm1Cmpb;
EPWM_setDigitalCompareWindowLength(EPWM1_BASE, blankingWindowLength);