fixed point math with shift register on FPGA

[GregFreeman]

This would be easy, but it's on FPGA.

I would essentially like to do what is shown, but with Fixed Point data. I also need my output from the add function to be <+,32,0> because it is going into a sine wave generation VI as the frequency. Basically I just want the frequency to slowly increase by "step size" at some predefined rate. Is it possible to do this? There must be some way I can do number to boolean array then boolean array to number, do some bitwise manipulation and convert back to the fixed point type I want. But, I can't figure it out. I have also read some of the fixed point articles on NI.com but with no luck getting it to work. Frankly, fixed-point math still eludes me.

Any suggestions?

[GregFreeman · Accepted solution]

Ah, what the method of trial and error will do for you.

This seems to work.

 

[Donovan_B]

You can also configure the output of the Add function by right-clicking and specifying the output type.  LabVIEW automatically changes the output to a double to account for overflow of the fixed-point value, but you can override this and you will see a blue dot at the output to notify you that the output configuration has been coerced, similar to the red input coercion dot.

[GregFreeman]

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@Donovan B wrote:

You can also configure the output of the Add function by right-clicking and specifying the output type.  LabVIEW automatically changes the output to a double to account for overflow of the fixed-point value, but you can override this and you will see a blue dot at the output to notify you that the output configuration has been coerced, similar to the red input coercion dot.

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That sure is cleaner!