Dividing 2 anologue input variables FPGA

[Rayden]

Hi for all,

i wana implement shematic controller 2 loop

the inner loop  need  to explain set point expression

the probléme its wiring  types because variable are note similar type so i used different converter blocs but don't function what type of convert i must use to set point with division of 2 analog input from FPGA

[mikeporter]

Just when you were thinking that nothing could be more more useless for troubleshooting than a screenshot... A picture from your phone? Really? And with the flash on yet...

Mike...

PS: CODE. We need to see code.

[Rayden]

my problem is conformity of types after division of 2 input 16 bits integer to set point  type f regulator thanks

[James_McN]

You will need to convert to fixed point numbers to perform the divide.

If you drop a to fixed point on each of the inputs it "should" (but check) convert it to a 16,16 fixed point number which means you don't lose any data but the divide will work.

[Rayden]

please some precision in your responce  i'am not expert so you want to say i add 2 converter to fixed point before dividing opération !

for your second solution  after dividing i integrate converter ?!! thanks.

[LDob]

Hi Rayden,

I believe James Mc was suggesting that you should try to convert each input (Ubus and Ucapa) to fixed point before dividing, instead of converting after division.

Try that and let us know how it works out.

Thanks,

Lauren

Applications Engineer

National Instruments

[James_McN]

Hi Rayden,

Yes exactly as Lauren said.

We need a number type that can have a fractional part for divide since even if you start with integers you can get a non-integer result. By converting to fixed point before the divide then the output will automatically be a fixed point number which can store the result.

Cheers,

James