Indeed, I have used CORDIC for rectangular-to-polar on a little micro without multiply (and power-constrained by a coin cell). I made a code-generator for this,

Indeed, I have used CORDIC for rectangular-to-polar on a little micro without multiply (and power-constrained by a coin cell). I made a code-generator for this, see https://github.com/markrages/cordic_polar https://github.com/markrages/cordic_polar