//   This is a component for LinuxCNC HAL
//   Copyright 2023 The LinuxCNC Project
//
//   This program is free software; you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation; either version 2 of the License, or
//   (at your option) any later version.
//
//   This program is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//   GNU General Public License for more details.
//
//   You should have received a copy of the GNU General Public License
//   along with this program; if not, write to the Free Software
//   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
component dsmono "Double-sided monoflop";

// Credits: This is very loosely based on edge.comp by Jeff Epler

pin in bit in "Input signal";
pin out bit out "Filtered output signal, tracking 'in' with a deadtime component";
pin out bit out_invert "Negative of 'out'";

param rw signed deadtime_ns = 0 "Time to be insensitive after an edge on 'in'.";
param r signed time_left_ns = 0 "Time left in this output pulse";

function _ nofp "Filter input with a deadtime component";
license "GPL";
author "ok";
;;

FUNCTION(_){
    static char old_in;
    if (time_left_ns > 0) {
        time_left_ns -= period;
    } else if (old_in != in) {
        time_left_ns = deadtime_ns;
        old_in = in;
        out = in;
        out_invert = !in;
    }
}