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USB-6210 2ch frequency measurement synchronization

I am driving ultrasonic motor.


Motor driving signal is about 30kHz square wave.
Position sensor is magnetic sensor, which outputs A phase and B phase signals.
Sensor signal is much like optical encoder.

 

I want to measure driving frequency and sensor count.
Frequency is measured with one counter(USB-6210-counter0: Counter Input_Frequency mode)
Encoder count value is increaed with the other counter(USB-6210-counter1: Counter Input_Angular Encoder mode)

 

How I can synchronize these two values?


I want to have values every one-period of driving frequency pulse.
But I had to read the frequency values in arrays because of data processing speed in Windows.
How can I get the encoder count value every time frequency is measured?


Thank you.

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