Problem with toggle2nist component

# --- SPINDLE-BUTTON ---
net spindle-button toggle2nist.0.in <= hm2_7i76e.0.7i76.0.0.input-25
net spindle-enable => toggle2nist.0.is-on
net spindle-manual-start toggle2nist.0.on
net spindle-manual-stop toggle2nist.0.off

# --- SPINDLE-BUTTON ---
net spindle-button toggle2nist.0.in <= hm2_7i76e.0.7i76.0.0.input-25
net spindle-enable => timedelay.0.in
net spindle-enable-delayed toggle2nist.0.is-on <= timedelay.0.out
net spindle-manual-start toggle2nist.0.on
net spindle-manual-stop toggle2nist.0.off

net spindle-enable        =>  pid.s.enable
net spindle-enable      => hm2_7i76e.0.7i76.0.0.spinena
net spindle-enable             <=  spindle.0.on

net spindle-manual-stop   halui.spindle.0.stop
net spindle-manual-start  halui.spindle.0.start

addf hm2_7i76e.0.read          servo-thread
addf motion-command-handler   servo-thread
addf motion-controller        servo-thread
addf pid.x.do-pid-calcs       servo-thread
addf pid.y.do-pid-calcs       servo-thread
addf pid.z.do-pid-calcs       servo-thread
addf pid.s.do-pid-calcs       servo-thread
addf ratio_select             servo-thread
addf scale.gear               servo-thread
addf hm2_7i76e.0.write         servo-thread
setp hm2_7i76e.0.dpll.01.timer-us -50
setp hm2_7i76e.0.stepgen.timer-number 1
addf and2.0                   servo-thread
addf and2.1                   servo-thread
addf spindle-scale            servo-thread
addf conv-float-s32.0         servo-thread
addf feed-scale               servo-thread
addf conv-float-s32.1         servo-thread
addf rapid-scale              servo-thread
addf conv-float-s32.2         servo-thread
addf toggle.0                 servo-thread
addf toggle2nist.0            servo-thread
addf timedelay.0              servo-thread

component toggle2nist "toggle button to nist logic";

description
"""
toggle2nist can be used with a momentary push button connected to a
toggle component to control a device that has separate on and off inputs
and has an is-on output. 
If in changes states via the toggle output
  If is-on is true then on is false and off is true. 
  If is-on is false the on true and off is false.
""";

pin in  bit in;
pin in  bit is_on;
pin out bit on;
pin out bit off;
variable int old_in;
variable int to_state=0;
function _ nofp;
license "GPL";
;;
FUNCTION(_)  {
if (in!=old_in) /* a toggle has occurred */ {
    if (is_on) {   /* turn OFF if it's on */
        on=0;
        off=1;
        to_state=0;
    }
    else if (!is_on) { /* turn ON if it's off */
        on=1;
        off=0;
        to_state=1;
    }
}
else {
/* reset pins when we see the desired state */
    if (to_state==is_on) {
        on=0;
        off=0;
    }
}
old_in=in;
}

variable int old_in;