software signal lock example in C++

Hello,

I'm new to NI and DAQ. Just posted this question before http://forums.ni.com/t5/Signal-Conditioning/usb-6211-DAQ-frequency-question/td-p/3202422  and found out that the signal can't be locked on a hardware level.

Can anyone provide an example in C / C++ to lock a 400 hz signal. I've used the ContAcq-IntClk.c example to read data from one resolver (sind and cosine) and a reference signal. However since the signal shifts to the right (in this case) it becomes difficult to determine the resolver's position.

Thank you in advance.

Regards,

Gerhard