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getting Qei position value problem in LPC-1768

Hi every one

i want to get the exact position alue of the quadrature encoder , in the QEI example of the CMSIS
but when i want to use the QEI_Getposition function the returned value is still zero , so the calculated speed in this example is correct, and i can get the RPM value.

please help me , how i can get the position??

Regards

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