HP-35 style trig functions

[Dan]

I used BCD and CORDIC algorithms in the firmware I wrote for the AriCalculator. There are CORDIC algorithms for sine and cosine but I didn't use them, instead I used a CORDIC algorithm to find tan and then the identities to find sine and cosine, as you mentioned.

Keep in mind that if you are using BCD your multiplication and division routines will be slowed by the conversion to and from binary if you use shift and add algorithms or the processor's hardware instructions for multiplication and division.

What hardware and software are you using for your project?