martinstokroos / fastcordic Goto Github PK

Hi. I managed to bash sine CORDIC algo which is a little bit faster than built-in sin.
I did it by using bingAI/copilot so it's difficult to say who is the author of the code or the license. property is theft.
It runs and can be learned from :)

https://github.com/piotrcurious/sintaylor/blob/main/sincordic_pure_32bit/sincordic_pure_32bit.ino

In the junkbox above there are other iterations, many not functioning but can still be used to learn something.
The code was tested on ESP8266 with SPI OLED display.

Most of the time accounted goes to pixel plotting, fmap conversions and float to interger and back conversions. I wanted the function to be quick drop-in replacement for sine for f.e. various graphic routines for things like angle gauges where one could really go by using look up tables or something else but it would make code less readable and arbitrary iteration option to CORDIC gives user ability to quickly choose sine approximator resolution without wasting time on recomputing look up tables etc. - one just chooses resolution by passing n to the function and can see consequences.