388 lines
10 KiB
Text
388 lines
10 KiB
Text
## FLARM
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## Version 08/2021
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## by Benedikt Wolf (D-ECHO)
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## References:
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## [1] https://flarm.com/wp-content/uploads/man/FLARM_OperatingManual_E.pdf (FLARM Technology and traditional/main instrument)
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## [2] https://swiss-bat.ch/.cm4all/iproc.php/flarm/Handbuch_V3%2B_FW571_DV100-a-EN.pdf?cdp=a (for v3 display, the one described there additionally has a numerical distance indicator)
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# Initialize necessary properties
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var flarm_base = props.globals.initNode("/instrumentation/flarm");
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var play_newcontact = flarm_base.initNode("new-contact", 0, "BOOL");
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var play_warn = flarm_base.initNode("warn", 0, "INT"); # two warning levels: 0 = off; 1 = warning level 1; 2 = warning level 2
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var receive_flag = flarm_base.initNode("receive", 0, "BOOL");
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var ub_leds = [
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flarm_base.initNode("ub-LED[0]", 0, "BOOL"),
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flarm_base.initNode("ub-LED[1]", 0, "BOOL"),
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flarm_base.initNode("ub-LED[2]", 0, "BOOL"),
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flarm_base.initNode("ub-LED[3]", 0, "BOOL"), ];
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var leds_green = [];
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var leds_red = [];
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for( var i = 0; i <= 11; i = i + 1 ){
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append(leds_green, flarm_base.initNode("LED["~i~"]", 0, "BOOL"));
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append(leds_red, flarm_base.initNode("LED-red["~i~"]", 0, "BOOL"));
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}
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var volts = props.globals.initNode("systems/electrical/outputs/flarm", 0.0, "DOUBLE");
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var track = props.globals.getNode("/orientation/track-deg");
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var ai_models = props.globals.getNode("/ai/models");
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var elapsed_sec = props.globals.getNode("/sim/time/elapsed-sec");
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# Initialize Arrays to internally store targets and warnings
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var targets = [];
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var warnings = [];
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var targets_tracked = [];
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# Initialize internal variables
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var max_dist = 4; # according to [1] typically 3-5km, depending on installation of antenna
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var running = 0;
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#Set properties
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for(var f=0; f<=30; f=f+1){
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append(targets, nil);
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append(warnings, nil);
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append(targets_tracked, 0);
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}
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# Helper function to return relative bearing towards target
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var relative = func (brg, heading) {
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brg = brg - heading;
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return geo.normdeg(brg);
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}
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# Helper function to play sound for new contact
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var new_contact = func () { #Sound message for new contact
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play_newcontact.setBoolValue( !play_newcontact.getBoolValue() );
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}
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# Target class
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#var target1 = Target.new(n,scnd);
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var Target = {
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new : func(n,scnd){
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m = { parents : [Target] };
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m.id=n;
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m.lat = ai_models.getNode("multiplayer["~n~"]/position/latitude-deg");
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m.lon = ai_models.getNode("multiplayer["~n~"]/position/longitude-deg");
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m.alt = ai_models.getNode("multiplayer["~n~"]/position/altitude-ft");
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m.pos = geo.Coord.new().set_latlon( m.lat.getDoubleValue(),
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m.lon.getDoubleValue(),
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m.alt.getDoubleValue() );
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m.second=0.0;
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var ac = geo.aircraft_position();
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m.last_dist = m.pos.direct_distance_to( ac );
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new_contact();
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return m;
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},
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update_data : func(){
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me.pos.set_latlon( me.lat.getDoubleValue(),
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me.lon.getDoubleValue(),
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me.alt.getDoubleValue() );
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},
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update_LED : func( scnd ) {
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var ac = geo.aircraft_position();
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#Time difference
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var delta_time = scnd - me.second;
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me.second = scnd;
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var actual_dist_now = me.pos.direct_distance_to( ac );
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#Delta Distance
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var delta_dist = ( me.last_dist - actual_dist_now ) / delta_time;
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#(Theoretical) time to collision
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if( delta_dist == 0 ){
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ttc=999;
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}else{
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var ttc = actual_dist_now / delta_dist;
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}
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if( ttc <= 0 ){
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ttc = 999;
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}
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var LED = [0,0,0,0,0,0,0,0,0,0,0,0];
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var bearing = ac.course_to( me.pos );
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var relative_bearing = relative( bearing, track.getDoubleValue() );
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var alt_diff = math.abs( ( me.pos.alt() * FT2M ) - ac.alt() ); #Altitude difference in meters
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if( ttc < 6 and alt_diff < 150){
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#Warn 1: all LEDs red
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warnings[me.id]=2;
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forindex(var key; LED){
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LED[key]=2;
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}
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}else if(ttc<14 and alt_diff < 300){
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#Warn 2: corresponding LED red
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warnings[me.id]=1;
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LED[int(relative_bearing/30+1)-1] = 2;
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}else{
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#Normal: corresponding LED green
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warnings[me.id]=0;
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LED[int(relative_bearing/30+1)-1] = 1;
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}
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me.last_dist=actual_dist_now;
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return LED;
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},
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update_ub : func(){
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var ac = geo.aircraft_position();
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var alt_diff = ( me.pos.alt() * FT2M ) - ac.alt(); #Altitude difference in meters
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var distance = ac.distance_to(me.pos);
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var angle = ( math.atan( alt_diff/distance ) )*R2D;
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return angle;
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},
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get_distance : func() {
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return me.pos.alt();
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},
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};
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setlistener("/sim/signals/fdm-initialized", func{
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phase1_timer = maketimer( 0.2, flarm_start_phase2 );
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phase2_timer = maketimer( 5, flarm_start_phase3 );
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phase3_timer = maketimer( 2, flarm_start_phase4 );
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startup_loop_timer = maketimer( 0, startup_loop );
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phase1_timer.singleShot = 1;
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phase2_timer.singleShot = 1;
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phase3_timer.singleShot = 1;
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});
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var update_FLARM = func{
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for(var f=0; f<=30; f=f+1){
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if(getprop("/ai/models/multiplayer["~f~"]/position/latitude-deg") != nil){
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var temp_pos = geo.Coord.set_latlon( getprop("/ai/models/multiplayer["~f~"]/position/latitude-deg"),
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getprop("/ai/models/multiplayer["~f~"]/position/longitude-deg"),
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getprop("/ai/models/multiplayer["~f~"]/position/altitude-ft"));
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#Check whether in range and target not already existing
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var distance_km = temp_pos.distance_to(geo.aircraft_position())/1000;
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if(distance_km<max_dist and targets_tracked[f] == 0){
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#Now generate a target
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targets[f]=Target.new( f, elapsed_sec.getDoubleValue() );
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targets_tracked[f] = 1;
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}else if(distance_km>max_dist and targets_tracked[f] == 1){
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#Target existing, but has moved meanwhile out of range
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targets[f] = nil;
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targets_tracked[f] = 0;
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}
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} else if ( targets_tracked[f] == 1){
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#Target existing, but has meanwhile logged out
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targets[f]=nil;
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targets_tracked[f] = 0;
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}
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}
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receive = 0;
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forindex(var key; targets){
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if(targets[key] != nil){
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targets[key].update_data();
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receive=1;
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}
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}
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#Check LEDs
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#12 LEDS, each cover 30 degrees
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var stored_distance=9999;
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var used_angle=nil;
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var LEDs=[0,0,0,0,0,0,0,0,0,0,0,0];
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forindex(var key; targets){
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if(targets[key]!=nil){
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var LED=targets[key].update_LED( elapsed_sec.getDoubleValue() ); #Get the value each time again because it should be precisely the current time
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forindex(var f; LED){
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if(LED[f]==1){
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LEDs[f]=1;
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}else if(LED[f]==2){
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LEDs[f]=2;
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}
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}
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var angle=targets[key].update_ub();
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var distance=targets[key].get_distance();
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if(distance<stored_distance){
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used_angle=angle;
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stored_distance=distance;
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}
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}
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}
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if(used_angle!=nil){
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if(used_angle > 14){
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ub_leds[0].setBoolValue(1);
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ub_leds[1].setBoolValue(0);
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ub_leds[2].setBoolValue(0);
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ub_leds[3].setBoolValue(0);
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}else if(used_angle > 0){
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ub_leds[0].setBoolValue(0);
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ub_leds[1].setBoolValue(1);
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ub_leds[2].setBoolValue(0);
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ub_leds[3].setBoolValue(0);
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}else if(used_angle < -14){
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ub_leds[0].setBoolValue(0);
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ub_leds[1].setBoolValue(0);
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ub_leds[2].setBoolValue(0);
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ub_leds[3].setBoolValue(1);
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}else if(used_angle < 0){
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ub_leds[0].setBoolValue(0);
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ub_leds[1].setBoolValue(0);
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ub_leds[2].setBoolValue(1);
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ub_leds[3].setBoolValue(0);
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}else{
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ub_leds[0].setBoolValue(0);
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ub_leds[1].setBoolValue(0);
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ub_leds[2].setBoolValue(0);
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ub_leds[3].setBoolValue(0);
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}
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}else{
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ub_leds[0].setBoolValue(0);
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ub_leds[1].setBoolValue(0);
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ub_leds[2].setBoolValue(0);
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ub_leds[3].setBoolValue(0);
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}
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forindex(var key; LEDs){
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if(LEDs[key]<=1){
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leds_green[key].setBoolValue(LEDs[key]);
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leds_red[key].setBoolValue(0);
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}else if(LEDs[key]==2){
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leds_green[key].setBoolValue(0);
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leds_red[key].setBoolValue(1);
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}
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}
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#Check Warning sounds
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warn=0;
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forindex(var key; warnings){
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if(warnings[key]==2 and warn<2){
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warn=2;
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}else if(warnings[key]==1 and warn<1){
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warn=1;
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}
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}
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play_warn.setValue(warn);
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if ( volts.getDoubleValue() > 9){
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receive_flag.setBoolValue(receive);
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if( running == 0 ){
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running = 1;
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}
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} else {
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running = 0;
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foreach(var led; leds_green){
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led.setBoolValue(0);
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}
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foreach(var led; leds_red){
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led.setBoolValue(0);
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}
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foreach(var led; ub_leds){
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led.setBoolValue(0);
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}
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receive_flag.setBoolValue(0);
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flarm_update.stop();
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}
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}
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var flarm_update = maketimer( 1, func() { update_FLARM(); } );
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# Startup as described in [1], p.6
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var phase1_timer = nil;
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var phase2_timer = nil;
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var phase3_timer = nil;
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var startup_loop_timer = nil;
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var starting = 0;
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var leds_startup = {
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green: [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
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red: [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
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};
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var startup_loop = func {
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if( !starting ){
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startup_loop_timer.stop();
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}
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if( volts.getDoubleValue() > 9 ){
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forindex( var key; leds_startup.green ){
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leds_green[key].setBoolValue( leds_startup.green[ key ] );
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leds_red[key].setBoolValue( leds_startup.red[ key ] );
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}
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} else {
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foreach( var el; leds_startup.green ){
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el = 0;
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}
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foreach( var el; leds_startup.red ){
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el = 0;
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}
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forindex(var key; leds_green){
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leds_green[key].setBoolValue(0);
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leds_red[key].setBoolValue(0);
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}
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starting = 0;
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}
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}
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flarm_start_phase1 = func () {
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if( volts.getDoubleValue() <= 9 ){
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return;
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}
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# 1. Short beep, all LEDs light up
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forindex(var key; leds_startup.green ){
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leds_startup.green[ key ] = 1;
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leds_startup.red[ key ] = 1;
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}
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play_warn.setIntValue(1);
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phase1_timer.restart(0.2);
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}
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flarm_start_phase2 = func () {
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if( volts.getDoubleValue() <= 9 ){
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return;
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}
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# beep and LEDs off except to show hardware version (here: show green LEDs 0 and 1)
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play_warn.setIntValue(0);
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forindex(var key; leds_startup.green){
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if( key > 1 ){
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leds_startup.green[key] = 0;
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}
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leds_startup.red[key] = 0;
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}
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phase2_timer.restart(5);
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}
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flarm_start_phase3 = func () {
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if( volts.getDoubleValue() <= 9 ){
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return;
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}
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# Show firmware version ( emit green LEDs 7 and 8 as well as 2 and 3 )
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leds_startup.green[0]= 0;
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leds_startup.green[1]= 0;
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leds_startup.green[2]= 1;
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leds_startup.green[3]= 1;
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leds_startup.green[7]= 1;
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leds_startup.green[8]= 1;
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phase3_timer.restart(2);
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}
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flarm_start_phase4 = func () {
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if( volts.getDoubleValue() <= 9 ){
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return;
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}
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# Go to normal operation
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starting = 0;
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running = 1;
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flarm_update.restart(1);
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}
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setlistener(volts, func{
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if( running == 0 and starting == 0 and volts.getDoubleValue() > 9) {
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starting = 1;
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flarm_start_phase1();
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startup_loop_timer.restart( 0 );
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}
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});
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