Can anyone check out where exactly I am going wrong

[irfan789]

I am doing this task using sbRIO9642 and sound and vibration signal simulator box  (in search of manual) on FPGA

using "TACH OUT " signal from the box so measure the speed  to the on board ports of sbrio

I am trying to measure the speed of the fan and here is the code for this 

everytime when i run this code 

RPM is starting from zero but I want the final value to be displaying....

So that I can use this as a process variable to control the speed of the fan using pid

[altenbach · Accepted solution]

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@irfan789 wrote:

RPM is starting from zero but I want the final value to be displaying....

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What if you would leave the shift register uninitialized?

[Yamaeda]

As Altenbach is implying, since you initialize the shift register it'll start from 0 every time. To start from the last achieved value, use an uninitialized register.

/Y

[irfan789]

ya got that and error rectified 

thanks a lot...