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Allow Type Cast in FPGA

We need a way to simply reinterpret the bits in our FPGAs.  I currently have a situation where I need to change my SGL values into U32 for the sake of sending data up to the host.  Currently, the only way is to make an IP node.  That is just silly.  We should be able to use the Type Cast simply for the purpose of reinterpreting the bits.

Trusted Enthusiast Trusted Enthusiast
Trusted Enthusiast

I use the To boolean array and back. To boolean array and back is basically free on FPGA if the bits match.

Knight of NI Knight of NI
Knight of NI

I will have to try that, but when I looked at it before, the To Boolean Array coerced my SGL.  I was left to assume this would drop my decimal points and just leave my rounded off integer value.

Member djclark

Unfortunately Number To Boolean Array coerces floating point data to U32, rather than flattening it. Everything after the decimal gets truncated.

Trusted Enthusiast Trusted Enthusiast
Trusted Enthusiast

I don't use SGL on FPGA so that's something I've never seen.


I think fixing this bug would be the best approach because that behaviour is wierd.

Member A_Tish

I will have to look into this, but try typecasting the SGL as FXP and then use Boolean array to number to typecast to U32.  


I will try and find where I had to accomplish this, very long time ago though.


I think that is the trick though, would be so much nicer to directly typecast though.  Not sure why the compiler cannot figure it out given they implemented the single already.  

Member heel

Yes the lack of typecasting in FPGA is a nuissance. Hope this will get fixed. I dont see any reason why not to support typecasting.

Member MrJackHamilton

I'm not sure about this, FPGA space is precious, and high-level implementations are often inefficient, this would consume FPGA space at the expense of coding convenience.


As my main concern in coding FPGA is fabric space, I prefer more low-level tools than high-level abstraction tools.

Member JHE

To boolean array and its opposite are typecast. They just cannot handle SGL, they get converted to I32 before boolean array.


Now, if someone would do some IP Nodes for SGL to U32 cast and back, and share it, I would be one happy camper :-)



Knight of NI Knight of NI
Knight of NI

They are out there.  I would have to search to find it again.  That is what I ended up doing.  But the issue with using IP nodes is you have to recompile them when you go to a new LabVIEW version and/or change hardware.  The type cast should just happen natively.

Active Participant T-REX$
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