Invert Interpolation

I have a ring that rotates using RInterp To Constant, in the current I get relative rotation and in the target, I create a rotation that is where I must get. I need the ring to rotate once in each direction. However, the ring rotates to the closest direction, is there a way to change this interpolation from IHaveToGetToThisRotation to IHaveToMoveXRotationsToYDirection.

Ill post photos soon to explain.

Thanks,
Alanzote.