component comp "Two input comparator with hysteresis";
pin in float in0 "Inverting input to the comparator";
pin in float in1 "Non-inverting input to the comparator";
pin out bit out "Output of the comparator.";
pin out bit equal "Equal within hysteresis.";

param rw float hyst=0.0 """Hysteresis of the comparator (default 0.0)

With zero hysteresis, the output is true when in1 > in0.  With nonzero
hysteresis, the output switches on and off at two different values,
separated by distance hyst around the point where in1 = in0.
Keep in mind that floating point calculations are never absalute
and it is wise to always set hist if you intend to use equal """;

function _ fp "Update the comparator";
license "GPL";
;;
FUNCTION(_) {
    float tmp = in1 - in0;
    float halfhyst = 0.5 * hyst;

    if(tmp < -halfhyst) {
	out = 0;
	equal = 0;
    } else if(tmp > halfhyst){
	out = 1;
	equal = 0;
    } else {
	equal = 1;
    }
}