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eQEP encoder unstable period latch QCPRDLAT values

Shahid Atiq
Intellectual 305 points

Other Parts Discussed in Thread: TMS320F28335

Hi

I am using 1000 lines eQEP encoder for PMSM speed measurement using TMS320f28335 with 150MHz clock. I have configured to latch the values on every UPEVENT. I am generating interrupt at unit time out of 100usec to read these latched values. Problem is that capture period values are not stable. I think at constant speed value is latched at every upevent, so  QCPRDLAT value should remain constant for constant speed. But in my case these vary much. I have checked through scope that all the signals entering DSP are fine. Anybody help please.

Regards

Shahid