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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 "Normal output. True when \\fBin1\\fR > \\fBin0\\fR (see parameter \\fBhyst\\fR for details)";
pin out bit equal "Match output. True when difference between \\fBin1\\fR and \\fBin0\\fR is less than \\fBhyst\\fR/2";
param rw float hyst=0.0 """Hysteresis of the comparator (default 0.0)
With zero hysteresis, the output is true when \\fBin1\\fR > \\fBin0\\fR. With nonzero
hysteresis, the output switches on and off at two different values,
separated by distance \\fBhyst\\fR around the point where \\fBin1\\fR = \\fBin0\\fR.
Keep in mind that floating point calculations are never absolute
and it is wise to always set \\fBhyst\\fR if you intend to use equal """;
function _ fp "Update the comparator";
license "GPL";
;;
FUNCTION(_) {
double tmp = in1 - in0;
double halfhyst = 0.5 * hyst;
if(tmp < -halfhyst) {
out = 0;
equal = 0;
} else if(tmp > halfhyst){
out = 1;
equal = 0;
} else {
equal = 1;
}
}
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