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DRV8312 BLDC_Sensored example

I have a couple of questions about 3 variables in the BLDC_Sensored example code.

How were the CmtnPeriod values determined or calculated?

Why is Ramp3Delay set to 4?

 

#if (BUILDLEVEL <= LEVEL2)
Uint32 CmtnPeriodTarget = 168;
Uint32 CmtnPeriodSetpt = 1024;
#else
Uint32 CmtnPeriodTarget = 848;
Uint32 CmtnPeriodSetpt = 1280;
#endif
Uint32 Ramp3Delay = 4;