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1 // native_ctrls.cxx -- FGFS "Native" controls I/O class
2 //
3 // Written by Curtis Olson, started July 2001.
4 //
5 // Copyright (C) 2001  Curtis L. Olson - curt@flightgear.org
6 //
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
11 //
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 // General Public License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 //
21 // $Id$
22
23
24 #ifdef HAVE_CONFIG_H
25 #  include <config.h>
26 #endif
27
28 #include <simgear/debug/logstream.hxx>
29 #include <simgear/io/iochannel.hxx>
30 #include <simgear/io/lowlevel.hxx> // endian tests
31
32 #include <FDM/flight.hxx>
33 #include <Main/fg_props.hxx>
34 #include <Scenery/scenery.hxx>  // ground elevation
35
36 #include "native_ctrls.hxx"
37
38 // FreeBSD works better with this included last ... (?)
39 #if defined(WIN32) && !defined(__CYGWIN__)
40 #  include <windows.h>
41 #else
42 #  include <netinet/in.h>       // htonl() ntohl()
43 #endif
44
45
46 FGNativeCtrls::FGNativeCtrls() {
47 }
48
49 FGNativeCtrls::~FGNativeCtrls() {
50 }
51
52
53 // open hailing frequencies
54 bool FGNativeCtrls::open() {
55     if ( is_enabled() ) {
56         SG_LOG( SG_IO, SG_ALERT, "This shouldn't happen, but the channel " 
57                 << "is already in use, ignoring" );
58         return false;
59     }
60
61     SGIOChannel *io = get_io_channel();
62
63     if ( ! io->open( get_direction() ) ) {
64         SG_LOG( SG_IO, SG_ALERT, "Error opening channel communication layer." );
65         return false;
66     }
67
68     set_enabled( true );
69
70     return true;
71 }
72
73
74 // The function htond is defined this way due to the way some
75 // processors and OSes treat floating point values.  Some will raise
76 // an exception whenever a "bad" floating point value is loaded into a
77 // floating point register.  Solaris is notorious for this, but then
78 // so is LynxOS on the PowerPC.  By translating the data in place,
79 // there is no need to load a FP register with the "corruped" floating
80 // point value.  By doing the BIG_ENDIAN test, I can optimize the
81 // routine for big-endian processors so it can be as efficient as
82 // possible
83 static void htond (double &x)   
84 {
85     if ( sgIsLittleEndian() ) {
86         int    *Double_Overlay;
87         int     Holding_Buffer;
88     
89         Double_Overlay = (int *) &x;
90         Holding_Buffer = Double_Overlay [0];
91     
92         Double_Overlay [0] = htonl (Double_Overlay [1]);
93         Double_Overlay [1] = htonl (Holding_Buffer);
94     } else {
95         return;
96     }
97 }
98
99
100 // Populate the FGNetCtrls structure from the property tree.
101 void FGProps2NetCtrls( FGNetCtrls *net, bool net_byte_order ) {
102     int i;
103     SGPropertyNode * node;
104     SGPropertyNode * tempnode;
105
106     // fill in values
107     node  = fgGetNode("/controls/flight", true);
108     net->version = FG_NET_CTRLS_VERSION;
109     net->aileron = node->getDoubleValue( "aileron" );
110     net->elevator = node->getDoubleValue( "elevator" );
111     net->elevator_trim = node->getDoubleValue( "elevator-trim" );
112     net->rudder = node->getDoubleValue( "rudder" );
113     net->flaps = node->getDoubleValue( "flaps" );
114     node = fgGetNode("/controls", true); 
115     net->flaps_power
116             = node->getDoubleValue( "/systems/electrical/outputs/flaps",
117                                     1.0 ) >= 1.0;
118     net->num_engines = FGNetCtrls::FG_MAX_ENGINES;
119     for ( i = 0; i < FGNetCtrls::FG_MAX_ENGINES; ++i ) {
120         node = fgGetNode("/controls/engines/engine", i );
121         net->throttle[i] = node->getDoubleValue( "throttle", 0.0 );
122         net->mixture[i] = node->getDoubleValue( "mixture", 0.0 );
123         net->prop_advance[i] = node->getDoubleValue( "propeller-pitch", 0.0 );
124         net->magnetos[i] = node->getIntValue( "magnetos", 0 );
125         if ( i == 0 ) {
126           // cout << "Magnetos -> " << node->getIntValue( "magnetos", 0 );
127         }
128         if ( i == 0 ) {
129           // cout << "Starter -> " << node->getIntValue( "starter", false )
130           //      << endl;
131         }
132         node = fgGetNode("/controls", true);
133         net->fuel_pump_power[i]
134             = node->getDoubleValue( "/systems/electrical/outputs/fuel-pump",
135                                     1.0 ) >= 1.0;
136
137         net->starter_power[i]
138             = node->getDoubleValue( "/systems/electrical/outputs/starter",
139                                     1.0 ) >= 1.0;
140     }
141     net->num_tanks = FGNetCtrls::FG_MAX_TANKS;
142     for ( i = 0; i < FGNetCtrls::FG_MAX_TANKS; ++i ) {
143         node = fgGetNode("/controls/fuel/tank", i);
144         if ( node->getChild("fuel_selector") != 0 ) {
145             net->fuel_selector[i]
146                 = node->getChild("fuel_selector")->getBoolValue();
147         } else {
148             net->fuel_selector[i] = false;
149         }
150     }
151     net->num_wheels = FGNetCtrls::FG_MAX_WHEELS;
152     tempnode = fgGetNode("/controls/gear", true);
153     for ( i = 0; i < FGNetCtrls::FG_MAX_WHEELS; ++i ) {
154         node = fgGetNode("/controls/gear/wheel", i);
155         if ( node->getChild("brake") != NULL ) {
156             if ( tempnode->getChild("parking-brake")->getDoubleValue() > 0.0 ) {
157                 net->brake[i] = 1.0;
158            } else {
159                 net->brake[i]
160                     = node->getChild("brake")->getDoubleValue();
161             }
162         } else {
163             net->brake[i] = 0.0;
164         }
165     }
166
167     node = fgGetNode("/controls/switches", true);
168     tempnode = node->getChild("master-bat");
169     if ( tempnode != NULL ) {
170         net->master_bat = tempnode->getBoolValue();
171     }
172     tempnode = node->getChild("master-alt");
173     if ( tempnode != NULL ) {
174         net->master_alt = tempnode->getBoolValue();
175     }
176     tempnode = node->getChild("master-avionics");
177     if ( tempnode != NULL ) {
178         net->master_avionics = tempnode->getBoolValue();
179     }
180
181     net->wind_speed_kt = fgGetDouble("/environment/wind-speed-kt");
182     net->wind_dir_deg = fgGetDouble("/environment/wind-from-heading-deg");
183     net->turbulence_norm = fgGetDouble("/environment/turbulence-norm");
184
185     // cur_fdm_state->get_ground_elev_ft() is what we want ... this
186     // reports the altitude of the aircraft.
187     // "/environment/ground-elevation-m" reports the ground elevation
188     // of the current view point which could change substantially if
189     // the user is switching views.
190     net->hground = cur_fdm_state->get_ground_elev_ft() * SG_FEET_TO_METER;
191     net->magvar = fgGetDouble("/environment/magnetic-variation-deg");
192     net->speedup = fgGetInt("/sim/speed-up");
193     net->freeze = 0;
194     if ( fgGetBool("/sim/freeze/master") ) {
195         net->freeze |= 0x01;
196     }
197     if ( fgGetBool("/sim/freeze/position") ) {
198         net->freeze |= 0x02;
199     }
200     if ( fgGetBool("/sim/freeze/fuel") ) {
201         net->freeze |= 0x04;
202     }
203
204     if ( net_byte_order ) {
205         // convert to network byte order
206         net->version = htonl(net->version);
207         htond(net->aileron);
208         htond(net->elevator);
209         htond(net->elevator_trim);
210         htond(net->rudder);
211         htond(net->flaps);
212         net->flaps_power = htonl(net->flaps_power);
213         for ( i = 0; i < FGNetCtrls::FG_MAX_ENGINES; ++i ) {
214             htond(net->throttle[i]);
215             htond(net->mixture[i]);
216             net->fuel_pump_power[i] = htonl(net->fuel_pump_power[i]);
217             htond(net->prop_advance[i]);
218             net->magnetos[i] = htonl(net->magnetos[i]);
219             net->starter_power[i] = htonl(net->starter_power[i]);
220         }
221         net->num_engines = htonl(net->num_engines);
222         for ( i = 0; i < FGNetCtrls::FG_MAX_TANKS; ++i ) {
223             net->fuel_selector[i] = htonl(net->fuel_selector[i]);
224         }
225         net->num_tanks = htonl(net->num_tanks);
226         for ( i = 0; i < FGNetCtrls::FG_MAX_WHEELS; ++i ) {
227             htond(net->brake[i]);
228         }
229         net->num_wheels = htonl(net->num_wheels);
230         net->gear_handle = htonl(net->gear_handle);
231         net->master_bat = htonl(net->master_bat);
232         net->master_alt = htonl(net->master_alt);
233         net->master_avionics = htonl(net->master_avionics);
234         htond(net->wind_speed_kt);
235         htond(net->wind_dir_deg);
236         htond(net->turbulence_norm);
237         htond(net->hground);
238         htond(net->magvar);
239         net->speedup = htonl(net->speedup);
240         net->freeze = htonl(net->freeze);
241     }
242 }
243
244
245 // Update the property tree from the FGNetCtrls structure.
246 void FGNetCtrls2Props( FGNetCtrls *net, bool net_byte_order ) {
247     int i;
248
249     SGPropertyNode * node;
250
251     if ( net_byte_order ) {
252         // convert from network byte order
253         net->version = htonl(net->version);
254         htond(net->aileron);
255         htond(net->elevator);
256         htond(net->elevator_trim);
257         htond(net->rudder);
258         htond(net->flaps);
259         net->flaps_power = htonl(net->flaps_power);
260         net->num_engines = htonl(net->num_engines);
261         for ( i = 0; i < net->num_engines; ++i ) {
262             net->magnetos[i] = htonl(net->magnetos[i]);
263             net->starter_power[i] = htonl(net->starter_power[i]);
264             htond(net->throttle[i]);
265             htond(net->mixture[i]);
266             net->fuel_pump_power[i] = htonl(net->fuel_pump_power[i]);
267             htond(net->prop_advance[i]);
268         }
269         net->num_tanks = htonl(net->num_tanks);
270         for ( i = 0; i < net->num_tanks; ++i ) {
271             net->fuel_selector[i] = htonl(net->fuel_selector[i]);
272         }
273         net->num_wheels = htonl(net->num_wheels);
274         for ( i = 0; i < net->num_wheels; ++i ) {
275             htond(net->brake[i]);
276         }
277         net->gear_handle = htonl(net->gear_handle);
278         net->master_bat = htonl(net->master_bat);
279         net->master_alt = htonl(net->master_alt);
280         net->master_avionics = htonl(net->master_avionics);
281         htond(net->wind_speed_kt);
282         htond(net->wind_dir_deg);
283         htond(net->turbulence_norm);
284         htond(net->hground);
285         htond(net->magvar);
286         net->speedup = htonl(net->speedup);
287         net->freeze = htonl(net->freeze);
288     }
289
290     if ( net->version != FG_NET_CTRLS_VERSION ) {
291         SG_LOG( SG_IO, SG_ALERT,
292                 "Version mismatch with raw controls packet format." );
293         SG_LOG( SG_IO, SG_ALERT,
294                 "FlightGear needs version = " << FG_NET_CTRLS_VERSION
295                 << " but is receiving version = "  << net->version );
296     }
297     node = fgGetNode("/controls/flight", true);
298     node->setDoubleValue( "aileron", net->aileron );
299     node->setDoubleValue( "elevator", net->elevator );
300     node->setDoubleValue( "elevator-trim", net->elevator_trim );
301     node->setDoubleValue( "rudder", net->rudder );
302     node->setDoubleValue( "flaps", net->flaps );
303
304     fgSetBool( "/systems/electrical/outputs/flaps", net->flaps_power );
305
306     for ( i = 0; i < FGNetCtrls::FG_MAX_ENGINES; ++i ) {
307         node = fgGetNode("/controls/engines/engine", i);
308         node->getChild( "throttle" )->setDoubleValue( net->throttle[i] );
309         node->getChild( "mixture" )->setDoubleValue( net->mixture[i] );
310         node->getChild( "propeller-pitch" )
311             ->setDoubleValue( net->prop_advance[i] );
312         node->getChild( "magnetos" )->setDoubleValue( net->magnetos[i] );
313     }
314
315     fgSetBool( "/systems/electrical/outputs/fuel-pump",
316                net->fuel_pump_power[0] );
317     fgSetBool( "/systems/electrical/outputs/starter",
318                net->starter_power[0] );
319
320     for ( i = 0; i < FGNetCtrls::FG_MAX_TANKS; ++i ) {
321         node = fgGetNode( "/controls/fuel/tank", i );
322         node->getChild( "fuel_selector" )
323             ->setBoolValue( net->fuel_selector[i] );
324     }
325     for ( i = 0; i < FGNetCtrls::FG_MAX_WHEELS; ++i ) {
326         node = fgGetNode( "/controls/gear/wheel", i );
327         node->getChild( "brake" )->setDoubleValue( net->brake[i] );
328     }
329
330     node = fgGetNode( "/controls/gear", true );
331     node->setBoolValue( "gear-down", net->gear_handle );
332
333     node = fgGetNode( "/controls/switches", true );
334     node->setBoolValue( "master-bat", net->master_bat );
335     node->setBoolValue( "master-alt", net->master_alt );
336     node->setBoolValue( "master-avionics", net->master_avionics );
337     
338     node = fgGetNode( "/environment", true );
339     node->setDoubleValue( "wind-speed-kt", net->wind_speed_kt );
340     node->setDoubleValue( "wind-from-heading-deg", net->wind_dir_deg );
341     node->setDoubleValue( "turbulence-norm", net->turbulence_norm );
342     node->setBoolValue( "magnetic-variation-deg", net->magvar );
343
344     // ground elevation ???
345
346     fgSetInt( "/sim/speed-up", net->speedup );
347
348     node = fgGetNode( "/sim/freeze", true );
349     node->setBoolValue( "master", net->freeze & 0x01 );
350     node->setBoolValue( "position", net->freeze & 0x02 );
351     node->setBoolValue( "fuel", net->freeze & 0x04 );
352 }
353
354
355 // process work for this port
356 bool FGNativeCtrls::process() {
357     SGIOChannel *io = get_io_channel();
358     int length = sizeof(FGNetCtrls);
359
360     if ( get_direction() == SG_IO_OUT ) {
361         // cout << "size of cur_fdm_state = " << length << endl;
362
363         FGProps2NetCtrls( &net_ctrls );
364
365         if ( ! io->write( (char *)(& net_ctrls), length ) ) {
366             SG_LOG( SG_IO, SG_ALERT, "Error writing data." );
367             return false;
368         }
369     } else if ( get_direction() == SG_IO_IN ) {
370         if ( io->get_type() == sgFileType ) {
371             if ( io->read( (char *)(& net_ctrls), length ) == length ) {
372                 SG_LOG( SG_IO, SG_DEBUG, "Success reading data." );
373                 FGNetCtrls2Props( &net_ctrls );
374             }
375         } else {
376             while ( io->read( (char *)(& net_ctrls), length ) == length ) {
377                 SG_LOG( SG_IO, SG_DEBUG, "Success reading data." );
378                 FGNetCtrls2Props( &net_ctrls );
379             }
380         }
381     }
382
383     return true;
384 }
385
386
387 // close the channel
388 bool FGNativeCtrls::close() {
389     SGIOChannel *io = get_io_channel();
390
391     set_enabled( false );
392
393     if ( ! io->close() ) {
394         return false;
395     }
396
397     return true;
398 }