CRC sub vi

[epiz]

I have a sub vi that I have used to calculate the CRC for a set of data. It works perfectly, as the data stays the same the crc stays the same. I have run into this issue where once I implement the sub vi into the main Vi the CRC value will change every time I hit run when the data has not changed. 

 

If there is a reason why it is happening or if anyone knows how to fix it that would be great

 

thank you 

[Neil Pate]

17 hours ago, epiz said:

I have a sub vi that I have used to calculate the CRC for a set of data. It works perfectly, as the data stays the same the crc stays the same. I have run into this issue where once I implement the sub vi into the main Vi the CRC value will change every time I hit run when the data has not changed. 

 

If there is a reason why it is happening or if anyone knows how to fix it that would be great

 

thank you 

Can you post your code?

[ShaunR]

Uninitialised shift register.

[epiz]

Here is the CRC conversion that I used in one of the sub vi. This works properly. In my main VI, everything is within an event structure in a while loop. Would that be why the CRC updates every time?

[epiz]

@ShaunR how do you initialize a shift register?

[crossrulz]

Wire a value into the shift register on the left side of the loop.