obsolete through changes to Instrumentation/{instrument_mgr,altimeter}.?xx
and Systems/static.?xx, and addition of Environment/atmosphere.?xx
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// encoder.cxx -- class to impliment an altitude encoder
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//
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// Written by Roy Vegard Ovesen, started September 2004.
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//
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// Copyright (C) 2004 Roy Vegard Ovesen - rvovesen@tiscali.no
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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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 "encoder.hxx"
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// Altitude based on pressure difference from sea level.
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// pressure difference inHG, altitude ft
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static double altitude_data[][2] = {
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{ -8.41, -8858.27 },
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{ 0.00, 0.00 },
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{ 3.05, 2952.76 },
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{ 5.86, 5905.51 },
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{ 8.41, 8858.27 },
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{ 10.74, 11811.02 },
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{ 12.87, 14763.78 },
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{ 14.78, 17716.54 },
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{ 16.55, 20669.29 },
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{ 18.13, 23622.05 },
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{ 19.62, 26574.80 },
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{ 20.82, 29527.56 },
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{ 21.96, 32480.31 },
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{ 23.01, 35433.07 },
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{ 23.91, 38385.83 },
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{ 24.71, 41338.58 },
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{ 25.40, 44291.34 },
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{ 26.00, 47244.09 },
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{ 26.51, 50196.85 },
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{ 26.96, 53149.61 },
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{ 27.35, 56102.36 },
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{ 27.68, 59055.12 },
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{ 27.98, 62007.87 },
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{ 29.62, 100000.00 }, // just to fill it in
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{ -1, -1 }
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};
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int round (double value, int nearest=1)
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{
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return ((int) (value/nearest + 0.5)) * nearest;
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}
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Encoder::Encoder(SGPropertyNode *node)
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:
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_name(node->getStringValue("name", "encoder")),
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_num(node->getIntValue("number", 0)),
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_static_pressure(node->getStringValue("static-pressure", "/systems/static/pressure-inhg")),
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altitudeTable(new SGInterpTable)
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{
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int i;
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for ( i = 0; altitude_data[i][0] != -1; i++ )
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altitudeTable->addEntry(altitude_data[i][0], altitude_data[i][1]);
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}
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Encoder::~Encoder()
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{
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delete altitudeTable;
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}
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void Encoder::init()
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{
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string branch;
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branch = "/instrumentation/" + _name;
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SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
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// Inputs
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staticPressureNode = fgGetNode(_static_pressure.c_str(), true);
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busPowerNode = fgGetNode("/systems/electrical/outputs/encoder", true);
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serviceableNode = node->getChild("serviceable", 0, true);
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// Outputs
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pressureAltitudeNode = node->getChild("pressure-alt-ft", 0, true);
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modeCAltitudeNode = node->getChild("mode-c-alt-ft", 0, true);
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}
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void Encoder::update(double dt)
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{
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if (serviceableNode->getBoolValue())
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{
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double staticPressure = staticPressureNode->getDoubleValue();
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double pressureAltitude =
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altitudeTable->interpolate(29.92 - staticPressure);
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int pressureAlt = round(pressureAltitude, 10);
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int modeCAltitude = round(pressureAltitude, 100);
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pressureAltitudeNode->setIntValue(pressureAlt);
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modeCAltitudeNode->setIntValue(modeCAltitude);
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}
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}
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@ -1,61 +0,0 @@
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// encoder.hxx -- class to impliment an altitude encoder
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//
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// Written by Roy Vegard Ovesen, started September 2004.
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//
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// Copyright (C) 2004 Roy Vegard Ovesen - rvovesen@tiscali.no
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#ifndef ENCODER_HXX
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#define ENCODER_HXX 1
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <Main/fg_props.hxx>
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#include <simgear/math/interpolater.hxx>
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#include <simgear/structure/subsystem_mgr.hxx>
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class Encoder : public SGSubsystem
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{
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public:
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Encoder(SGPropertyNode *node);
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~Encoder();
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void init ();
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void update (double dt);
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private:
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// Inputs
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SGPropertyNode_ptr staticPressureNode;
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SGPropertyNode_ptr busPowerNode;
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SGPropertyNode_ptr serviceableNode;
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// Outputs
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SGPropertyNode_ptr pressureAltitudeNode;
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SGPropertyNode_ptr modeCAltitudeNode;
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// Internal
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string _name;
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int _num;
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string _static_pressure;
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SGInterpTable* altitudeTable;
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};
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#endif // ENCODER_HXX
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