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CubeMX CRC polynomial can't be entered

Question asked by frackers on Aug 20, 2016
Latest reply on Nov 7, 2016 by Jeanne Joly
Running 4.15 and as a programmer I really don't need this Xa+Xb rubbish.  Can we just have a decimal (or preferably) an hex field?
If it is going to have something clever like this then at least make sure it works. There are just so many things wrong with the implementation.
The CRC16 CCITT poly is x16+x15+x5+1 but according to the help, for a 16 bit poly the highest value must be LESS than 16. 
So I tried entering x15+x14+x4+1 (and without the +1) thinking that the bits were numbered differently but still no go. In fact it doesn't accept any values :(