461 lines
14 KiB
C++
461 lines
14 KiB
C++
// kr-87.cxx -- class to impliment the King KR 87 Digital ADF
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//
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// Written by Curtis Olson, started April 2002.
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//
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// Copyright (C) 2002 Curtis L. Olson - curt@flightgear.org
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h> // snprintf
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#include <simgear/compiler.h>
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#include <simgear/math/sg_random.h>
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#include <Aircraft/aircraft.hxx>
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#include <Navaids/navlist.hxx>
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#include <Time/FGEventMgr.hxx>
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#include "kr_87.hxx"
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#include <string>
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SG_USING_STD(string);
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static int play_count = 0;
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static time_t last_time = 0;
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/**
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* Boy, this is ugly! Make the VOR range vary by altitude difference.
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*/
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static double kludgeRange ( double stationElev, double aircraftElev,
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double nominalRange)
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{
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// Assume that the nominal range (usually
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// 50nm) applies at a 5,000 ft difference.
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// Just a wild guess!
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double factor = ((aircraftElev*SG_METER_TO_FEET) - stationElev) / 5000.0;
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double range = fabs(nominalRange * factor);
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// Clamp the range to keep it sane; for
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// now, never less than 25% or more than
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// 500% of nominal range.
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if (range < nominalRange/4.0) {
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range = nominalRange/4.0;
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} else if (range > nominalRange*5.0) {
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range = nominalRange*5.0;
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}
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return range;
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}
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// Constructor
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FGKR_87::FGKR_87() :
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lon_node(fgGetNode("/position/longitude-deg", true)),
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lat_node(fgGetNode("/position/latitude-deg", true)),
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alt_node(fgGetNode("/position/altitude-ft", true)),
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need_update(true),
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valid(false),
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freq(0.0),
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stby_freq(0.0),
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on_off_vol_btn(0.5),
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adf_btn(true),
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bfo_btn(false),
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frq_btn(false),
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last_frq_btn(false),
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flt_et_btn(false),
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last_flt_et_btn(false),
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set_rst_btn(false),
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last_set_rst_btn(false),
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goal_needle_deg(0.0),
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needle_deg(0.0),
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flight_timer(0.0),
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elapsed_timer(0.0),
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tmp_timer(0.0),
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ant_mode(0),
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stby_mode(0),
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timer_mode(0),
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count_mode(0)
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{
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SGPath path( globals->get_fg_root() );
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SGPath term = path;
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term.append( "Navaids/range.term" );
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SGPath low = path;
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low.append( "Navaids/range.low" );
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SGPath high = path;
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high.append( "Navaids/range.high" );
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term_tbl = new SGInterpTable( term.str() );
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low_tbl = new SGInterpTable( low.str() );
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high_tbl = new SGInterpTable( high.str() );
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}
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// Destructor
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FGKR_87::~FGKR_87()
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{
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delete term_tbl;
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delete low_tbl;
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delete high_tbl;
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}
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void
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FGKR_87::init ()
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{
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morse.init();
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update(0); // FIXME: use dt
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}
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void
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FGKR_87::bind ()
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{
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// User inputs
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fgTie("/radios/adf/frequencies/selected-khz", this,
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&FGKR_87::get_freq, &FGKR_87::set_freq);
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fgSetArchivable("/radios/adf/frequencies/selected-khz");
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fgTie("/radios/adf/frequencies/standby-khz", this,
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&FGKR_87::get_stby_freq, &FGKR_87::set_stby_freq);
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fgSetArchivable("/radios/adf/frequencies/standby-khz");
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fgTie("/radios/adf/rotation-deg", this,
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&FGKR_87::get_rotation, &FGKR_87::set_rotation);
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fgSetArchivable("/radios/adf/rotation-deg");
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fgTie("/radios/adf/needle-deg", this,
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&FGKR_87::get_needle_deg);
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fgTie("/radios/adf/on-off-volume", this,
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&FGKR_87::get_on_off_vol_btn,
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&FGKR_87::set_on_off_vol_btn);
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fgSetArchivable("/radios/adf/on-off-volume");
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fgTie("/radios/adf/adf-btn", this,
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&FGKR_87::get_adf_btn,
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&FGKR_87::set_adf_btn);
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fgTie("/radios/adf/bfo-btn", this,
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&FGKR_87::get_bfo_btn,
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&FGKR_87::set_bfo_btn);
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fgTie("/radios/adf/frq-btn", this,
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&FGKR_87::get_frq_btn,
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&FGKR_87::set_frq_btn);
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fgTie("/radios/adf/flt-et-btn", this,
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&FGKR_87::get_flt_et_btn,
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&FGKR_87::set_flt_et_btn);
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fgTie("/radios/adf/set-rst-btn", this,
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&FGKR_87::get_set_rst_btn,
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&FGKR_87::set_set_rst_btn);
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fgTie("/radios/adf/stby-mode", this,
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&FGKR_87::get_stby_mode);
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fgTie("/radios/adf/timer-mode", this,
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&FGKR_87::get_timer_mode);
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fgTie("/radios/adf/count-mode", this,
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&FGKR_87::get_count_mode);
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fgTie("/radios/adf/ident", this,
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&FGKR_87::get_ident_btn,
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&FGKR_87::set_ident_btn);
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fgSetArchivable("/radios/adf/ident");
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// calculated values
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fgTie("/radios/adf/inrange", this, &FGKR_87::get_inrange);
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fgTie("/radios/adf/heading", this, &FGKR_87::get_heading);
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fgTie("/radios/adf/flight-timer", this, &FGKR_87::get_flight_timer);
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fgTie("/radios/adf/elapsed-timer", this,
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&FGKR_87::get_elapsed_timer,
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&FGKR_87::set_elapsed_timer);
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}
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void
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FGKR_87::unbind ()
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{
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fgUntie("/radios/adf/frequencies/selected-khz");
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fgUntie("/radios/adf/frequencies/standby-khz");
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fgUntie("/radios/adf/rotation-deg");
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fgUntie("/radios/adf/needle-deg");
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fgUntie("/radios/adf/on-off-volume");
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fgUntie("/radios/adf/adf-btn");
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fgUntie("/radios/adf/bfo-btn");
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fgUntie("/radios/adf/frq-btn");
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fgUntie("/radios/adf/flt-et-btn");
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fgUntie("/radios/adf/set-rst-btn");
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fgUntie("/radios/adf/timer-mode");
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fgUntie("/radios/adf/count-mode");
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fgUntie("/radios/adf/ident");
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fgUntie("/radios/adf/inrange");
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fgUntie("/radios/adf/heading");
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fgUntie("/radios/adf/flight-timer");
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fgUntie("/radios/adf/elapsed-timer");
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}
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// Update the various nav values based on position and valid tuned in navs
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void
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FGKR_87::update(double dt)
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{
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double acft_lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
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double acft_lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
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double acft_elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
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need_update = false;
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Point3D aircraft = sgGeodToCart( Point3D( acft_lon, acft_lat, acft_elev ) );
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Point3D station;
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double az1, az2, s;
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////////////////////////////////////////////////////////////////////////
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// Radio
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////////////////////////////////////////////////////////////////////////
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if ( on_off_vol_btn >= 0.01 ) {
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// buttons
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if ( adf_btn == 0 ) {
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ant_mode = 1;
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} else {
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ant_mode = 0;
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}
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if ( frq_btn && frq_btn != last_frq_btn && stby_mode == 0 ) {
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double tmp = freq;
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freq = stby_freq;
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stby_freq = tmp;
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} else if ( frq_btn ) {
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stby_mode = 0;
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count_mode = 0;
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}
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last_frq_btn = frq_btn;
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if ( flt_et_btn && flt_et_btn != last_flt_et_btn ) {
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if ( stby_mode == 0 ) {
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timer_mode = 0;
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} else {
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timer_mode = !timer_mode;
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}
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stby_mode = 1;
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}
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last_flt_et_btn = flt_et_btn;
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if ( set_rst_btn == 1 && set_rst_btn != last_set_rst_btn ) {
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// button depressed
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tmp_timer = 0.0;
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}
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if ( set_rst_btn == 1 && set_rst_btn == last_set_rst_btn ) {
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// button depressed and was last iteration too
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tmp_timer += dt;
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cout << "tmp_timer = " << tmp_timer << endl;
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}
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if ( set_rst_btn == 0 && set_rst_btn != last_set_rst_btn ) {
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// button released
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if ( tmp_timer > 2.0 ) {
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// button held depressed for 2 seconds
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cout << "entering elapsed count down mode" << endl;
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timer_mode = 1;
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count_mode = 2;
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elapsed_timer = 0.0;
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} else if ( count_mode == 2 ) {
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count_mode = 1;
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} else {
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count_mode = 0;
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elapsed_timer = 0.0;
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}
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}
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last_set_rst_btn = set_rst_btn;
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// timers
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flight_timer += dt;
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if ( set_rst_btn == 0 ) {
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// only count if set/rst button not depressed
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if ( count_mode == 0 ) {
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elapsed_timer += dt;
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} else if ( count_mode == 1 ) {
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elapsed_timer -= dt;
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if ( elapsed_timer < 1.0 ) {
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count_mode = 0;
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elapsed_timer = 0.0;
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}
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}
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}
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if ( valid ) {
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// staightline distance
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station = Point3D( x, y, z );
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dist = aircraft.distance3D( station );
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// wgs84 heading
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geo_inverse_wgs_84( acft_elev,
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acft_lat * SGD_RADIANS_TO_DEGREES,
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acft_lon * SGD_RADIANS_TO_DEGREES,
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stn_lat, stn_lon,
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&az1, &az2, &s );
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heading = az1;
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// cout << " heading = " << heading
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// << " dist = " << dist << endl;
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effective_range = kludgeRange(stn_elev, acft_elev, range);
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if ( dist < effective_range * SG_NM_TO_METER ) {
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inrange = true;
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} else if ( dist < 2 * effective_range * SG_NM_TO_METER ) {
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inrange = sg_random() <
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( 2 * effective_range * SG_NM_TO_METER - dist ) /
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(effective_range * SG_NM_TO_METER);
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} else {
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inrange = false;
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}
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if ( inrange ) {
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goal_needle_deg = heading
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- fgGetDouble("/orientation/heading-deg");
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}
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} else {
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inrange = false;
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}
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if ( ant_mode ) {
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goal_needle_deg = 90.0;
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}
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} else {
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goal_needle_deg = 0.0;
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flight_timer = 0.0;
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elapsed_timer = 0.0;
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}
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// cout << "goal = " << goal_needle_deg << "actual = " << needle_deg
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// << endl;
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double diff = goal_needle_deg - needle_deg;
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while ( diff < -180.0 ) { diff += 360.0; }
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while ( diff > 180.0 ) { diff -= 360.0; }
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needle_deg += diff * dt * 4;
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// cout << "flt = " << flight_timer << " et = " << elapsed_timer
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// << " needle = " << needle_deg << endl;
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#ifdef ENABLE_AUDIO_SUPPORT
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if ( valid && inrange ) {
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// play station ident via audio system if on + ident,
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// otherwise turn it off
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if ( on_off_vol_btn >= 0.01 && ident_btn ) {
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FGSimpleSound *sound;
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sound = globals->get_soundmgr()->find( "adf-ident" );
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if ( sound != NULL ) {
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sound->set_volume( on_off_vol_btn );
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} else {
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SG_LOG( SG_COCKPIT, SG_ALERT, "Can't find adf-ident sound" );
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}
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if ( last_time <
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globals->get_time_params()->get_cur_time() - 30 ) {
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last_time = globals->get_time_params()->get_cur_time();
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play_count = 0;
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}
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if ( play_count < 4 ) {
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// play ADF ident
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if ( !globals->get_soundmgr()->is_playing("adf-ident") ) {
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globals->get_soundmgr()->play_once( "adf-ident" );
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++play_count;
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}
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}
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} else {
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globals->get_soundmgr()->stop( "adf-ident" );
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}
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}
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#endif
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}
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// Update current nav/adf radio stations based on current postition
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void FGKR_87::search()
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{
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double acft_lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
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double acft_lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
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double acft_elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
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// FIXME: the panel should handle this
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FGNav nav;
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static string last_ident = "";
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////////////////////////////////////////////////////////////////////////
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// ADF.
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////////////////////////////////////////////////////////////////////////
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if ( current_navlist->query( acft_lon, acft_lat, acft_elev, freq, &nav ) ) {
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char sfreq[128];
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snprintf( sfreq, 10, "%.0f", freq );
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ident = sfreq;
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ident += nav.get_ident();
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cout << "adf ident = " << ident << endl;
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valid = true;
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if ( last_ident != ident ) {
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last_ident = ident;
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trans_ident = nav.get_trans_ident();
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stn_lon = nav.get_lon();
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stn_lat = nav.get_lat();
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stn_elev = nav.get_elev();
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range = nav.get_range();
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effective_range = kludgeRange(stn_elev, acft_elev, range);
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x = nav.get_x();
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y = nav.get_y();
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z = nav.get_z();
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#ifdef ENABLE_AUDIO_SUPPORT
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if ( globals->get_soundmgr()->exists( "adf-ident" ) ) {
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globals->get_soundmgr()->remove( "adf-ident" );
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}
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FGSimpleSound *sound;
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sound = morse.make_ident( trans_ident, LO_FREQUENCY );
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sound->set_volume( 0.3 );
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globals->get_soundmgr()->add( sound, "adf-ident" );
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int offset = (int)(sg_random() * 30.0);
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play_count = offset / 4;
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last_time = globals->get_time_params()->get_cur_time() -
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offset;
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// cout << "offset = " << offset << " play_count = "
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// << play_count << " last_time = "
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// << last_time << " current time = "
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// << globals->get_time_params()->get_cur_time() << endl;
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#endif
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// cout << "Found an adf station in range" << endl;
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// cout << " id = " << nav.get_ident() << endl;
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}
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} else {
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valid = false;
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ident = "";
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trans_ident = "";
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#ifdef ENABLE_AUDIO_SUPPORT
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globals->get_soundmgr()->remove( "adf-ident" );
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#endif
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last_ident = "";
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// cout << "not picking up adf. :-(" << endl;
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}
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}
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double FGKR_87::get_stby_freq() const {
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if ( stby_mode == 0 ) {
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return stby_freq;
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} else {
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if ( timer_mode == 0 ) {
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return flight_timer;
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} else {
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return elapsed_timer;
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}
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}
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}
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