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TMS320F28035: How to aquire Back EMF signals with ADC

Part Number: TMS320F28035
Other Parts Discussed in Thread: CONTROLSUITE

hi guys,

I was doing my experiment with F28035 and TMDSHVMTRPFCKIT.

I have a question while reading "Trapezoidal Control of BLDC Motors Using Hall Effect Sensors".

It seems that we can aquire the BEMF signasl through the ADC HW and ADC CONV, but I'm not quite understand how it works.

Besides I was wondering about how can I aquire the BEMF signals without telling the MCU what my motor's Ke is.

Could someone please lend me a hand?

Thank you for your time.