component fakeencoder;
pin in float velocity;
pin out float position;
pin io bit index-enable;
function _;
license "GPL";
;;
#include <rtapi_math.h>
FUNCTION(_) {
    double old_position = position;
    double new_position = old_position + velocity * fperiod;
    if(index_enable) {
        if(floor(new_position) != floor(old_position)) {
            index_enable = false;
            if(velocity > 0)
                // turning forward, position after reset should be positive
                new_position = new_position - floor(new_position);
            else
                // turning backward, position after reset should be negative
                new_position = new_position - ceil(new_position);
            index_enable = 0;
        }
    }
    position = new_position;
}