// TODO:
// - better spin-up
+#include <simgear/compiler.h>
+
+#include <iostream>
+#include <string>
+#include <sstream>
+
#include <math.h> // fabs()
#include "attitude_indicator.hxx"
#include <Main/util.hxx>
-AttitudeIndicator::AttitudeIndicator ()
+AttitudeIndicator::AttitudeIndicator ( SGPropertyNode *node )
+ :
+ _name(node->getStringValue("name", "attitude-indicator")),
+ _num(node->getIntValue("number", 0)),
+ _suction(node->getStringValue("suction", "/systems/vacuum/suction-inhg")),
+ spin_thresh(0.8),
+ max_roll_error(40.0),
+ max_pitch_error(12.0)
{
}
void
AttitudeIndicator::init ()
{
- // TODO: allow index of pump and AI
- // to be configured.
+ string branch;
+ branch = "/instrumentation/" + _name;
+
+ SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
+ SGPropertyNode *n;
+
_pitch_in_node = fgGetNode("/orientation/pitch-deg", true);
_roll_in_node = fgGetNode("/orientation/roll-deg", true);
- _suction_node = fgGetNode("/systems/vacuum[0]/suction-inhg", true);
- _tumble_flag_node =
- fgGetNode("/instrumentation/attitude-indicator/config/tumble-flag",
- true);
- _caged_node =
- fgGetNode("/instrumentation/attitude-indicator/caged-flag", true);
- _tumble_node =
- fgGetNode("/instrumentation/attitude-indicator/tumble-norm", true);
- _pitch_out_node =
- fgGetNode("/instrumentation/attitude-indicator/indicated-pitch-deg",
- true);
- _roll_out_node =
- fgGetNode("/instrumentation/attitude-indicator/indicated-roll-deg",
- true);
+ _suction_node = fgGetNode(_suction.c_str(), true);
+ SGPropertyNode *cnode = node->getChild("config", 0, true);
+ _tumble_flag_node = cnode->getChild("tumble-flag", 0, true);
+ _caged_node = node->getChild("caged-flag", 0, true);
+ _tumble_node = node->getChild("tumble-norm", 0, true);
+ if( ( n = cnode->getChild("spin-thresh", 0, false ) ) != NULL )
+ spin_thresh = n->getDoubleValue();
+ if( ( n = cnode->getChild("max-roll-error-deg", 0, false ) ) != NULL )
+ max_roll_error = n->getDoubleValue();
+ if( ( n = cnode->getChild("max-pitch-error-deg", 0, false ) ) != NULL )
+ max_pitch_error = n->getDoubleValue();
+ _pitch_int_node = node->getChild("internal-pitch-deg", 0, true);
+ _roll_int_node = node->getChild("internal-roll-deg", 0, true);
+ _pitch_out_node = node->getChild("indicated-pitch-deg", 0, true);
+ _roll_out_node = node->getChild("indicated-roll-deg", 0, true);
}
void
AttitudeIndicator::bind ()
{
- fgTie("/instrumentation/attitude-indicator/serviceable",
+ std::ostringstream temp;
+ string branch;
+ temp << _num;
+ branch = "/instrumentation/" + _name + "[" + temp.str() + "]";
+
+ fgTie((branch + "/serviceable").c_str(),
&_gyro, &Gyro::is_serviceable, &Gyro::set_serviceable);
- fgTie("/instrumentation/attitude-indicator/spin",
+ fgTie((branch + "/spin").c_str(),
&_gyro, &Gyro::get_spin_norm, &Gyro::set_spin_norm);
}
void
AttitudeIndicator::unbind ()
{
- fgUntie("/instrumentation/attitude-indicator/serviceable");
- fgUntie("/instrumentation/attitude-indicator/spin");
+ std::ostringstream temp;
+ string branch;
+ temp << _num;
+ branch = "/instrumentation/" + _name + "[" + temp.str() + "]";
+
+ fgUntie((branch + "/serviceable").c_str());
+ fgUntie((branch + "/spin").c_str());
}
void
{
// If it's caged, it doesn't indicate
if (_caged_node->getBoolValue()) {
- _roll_out_node->setDoubleValue(0.0);
- _pitch_out_node->setDoubleValue(0.0);
+ _roll_int_node->setDoubleValue(0.0);
+ _pitch_int_node->setDoubleValue(0.0);
return;
}
_tumble_node->setDoubleValue(tumble);
}
- roll = fgGetLowPass(_roll_out_node->getDoubleValue(), roll,
+ roll = fgGetLowPass(_roll_int_node->getDoubleValue(), roll,
responsiveness);
- pitch = fgGetLowPass(_pitch_out_node->getDoubleValue(), pitch,
+ pitch = fgGetLowPass(_pitch_int_node->getDoubleValue(), pitch,
responsiveness);
// Assign the new values
- _roll_out_node->setDoubleValue(roll);
- _pitch_out_node->setDoubleValue(pitch);
+ _roll_int_node->setDoubleValue(roll);
+ _pitch_int_node->setDoubleValue(pitch);
+
+ // add in a gyro underspin "error" if gyro is spinning too slowly
+ double roll_error;
+ double pitch_error;
+ if ( spin <= spin_thresh ) {
+ double roll_error_factor = (spin_thresh - spin) / spin_thresh;
+ double pitch_error_factor = (spin_thresh - spin) / spin_thresh;
+ roll_error = roll_error_factor * roll_error_factor * max_roll_error;
+ pitch_error = pitch_error_factor * pitch_error_factor * max_pitch_error;
+ } else {
+ roll_error = 0.0;
+ pitch_error = 0.0;
+ }
+
+ _roll_out_node->setDoubleValue(roll + roll_error);
+ _pitch_out_node->setDoubleValue(pitch + pitch_error);
}
// end of attitude_indicator.cxx