add angle correction force, and auto center set (with mechanical stop present)

[nhy6iii]

I'm making FFB to rudder pedals.
and freedom of movement is +-43degree.

from construction of my pedals I need angle correction force to:
force applied = force request x Cos (current angle of deflection)
table with degree deflection on X axis and force correction on Y axis (0-100%) would be good too.

and because Z pulse from ABZ encoder can never be find. (through only ~90degree of full movement)
automatic finding center at start, would be good option (and separate setting for calibration amperage/force)

in my personal situation Z pulse can be seen 1x or 2x in range of motion, because encoder is driven by timing belt with 6x reduction/speedup ratio,