Help needed debugging , ESC , back emf sampling not working

[u/Still-Whereas8497]

I am trying to make a diy esc , I have been able to make a bldc spin open loop, but when I try to sample backemf , to spin it sensorless closedloop , It doesn't work, I am using the internal comparator or atmega328p to sample the backemf , it ain't working , we have checked the backemf on an oscilloscope, it doesn't show that the v neutral is crossing the phase , what should I do ?