1 // native_ctrls.cxx -- FGFS "Native" controls I/O class
3 // Written by Curtis Olson, started July 2001.
5 // Copyright (C) 2001 Curtis L. Olson - curt@flightgear.org
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.
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.
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.
28 #include <simgear/debug/logstream.hxx>
29 #include <simgear/io/iochannel.hxx>
30 #include <simgear/io/lowlevel.hxx> // endian tests
32 #include <FDM/flight.hxx>
33 #include <Main/fg_props.hxx>
34 #include <Scenery/scenery.hxx> // ground elevation
36 #include "native_ctrls.hxx"
38 // FreeBSD works better with this included last ... (?)
39 #if defined(WIN32) && !defined(__CYGWIN__)
42 # include <netinet/in.h> // htonl() ntohl()
46 FGNativeCtrls::FGNativeCtrls() {
49 FGNativeCtrls::~FGNativeCtrls() {
53 // open hailing frequencies
54 bool FGNativeCtrls::open() {
56 SG_LOG( SG_IO, SG_ALERT, "This shouldn't happen, but the channel "
57 << "is already in use, ignoring" );
61 SGIOChannel *io = get_io_channel();
63 if ( ! io->open( get_direction() ) ) {
64 SG_LOG( SG_IO, SG_ALERT, "Error opening channel communication layer." );
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
83 static void htond (double &x)
85 if ( sgIsLittleEndian() ) {
89 Double_Overlay = (int *) &x;
90 Holding_Buffer = Double_Overlay [0];
92 Double_Overlay [0] = htonl (Double_Overlay [1]);
93 Double_Overlay [1] = htonl (Holding_Buffer);
100 // Populate the FGNetCtrls structure from the property tree.
101 void FGProps2NetCtrls( FGNetCtrls *net, bool net_byte_order ) {
104 SGPropertyNode * node;
105 SGPropertyNode * tempnode;
108 node = fgGetNode("/controls/flight", true);
109 net->version = FG_NET_CTRLS_VERSION;
110 net->aileron = node->getDoubleValue( "aileron" );
111 net->elevator = node->getDoubleValue( "elevator" );
112 net->elevator_trim = node->getDoubleValue( "elevator-trim" );
113 net->rudder = node->getDoubleValue( "rudder" );
114 net->flaps = node->getDoubleValue( "flaps" );
115 node = fgGetNode("/controls", true);
117 = node->getDoubleValue( "/systems/electrical/outputs/flaps",
119 net->num_engines = FGNetCtrls::FG_MAX_ENGINES;
120 for ( i = 0; i < FGNetCtrls::FG_MAX_ENGINES; ++i ) {
121 node = fgGetNode("/controls/engines/engine", i );
122 net->throttle[i] = node->getDoubleValue( "throttle", 0.0 );
123 net->mixture[i] = node->getDoubleValue( "mixture", 0.0 );
124 net->prop_advance[i] = node->getDoubleValue( "propeller-pitch", 0.0 );
125 net->magnetos[i] = node->getIntValue( "magnetos", 0 );
127 // cout << "Magnetos -> " << node->getIntValue( "magnetos", 0 );
130 // cout << "Starter -> " << node->getIntValue( "starter", false )
133 node = fgGetNode("/controls", true);
134 net->fuel_pump_power[i]
135 = node->getDoubleValue( "/systems/electrical/outputs/fuel-pump",
138 net->starter_power[i]
139 = node->getDoubleValue( "/systems/electrical/outputs/starter",
142 net->num_tanks = FGNetCtrls::FG_MAX_TANKS;
143 for ( i = 0; i < FGNetCtrls::FG_MAX_TANKS; ++i ) {
144 node = fgGetNode("/controls/fuel/tank", i);
145 if ( node->getChild("fuel-selector") != 0 ) {
146 net->fuel_selector[i]
147 = node->getChild("fuel-selector")->getBoolValue();
149 net->fuel_selector[i] = false;
152 net->num_wheels = FGNetCtrls::FG_MAX_WHEELS;
153 tempnode = fgGetNode("/controls/gear", true);
154 for ( i = 0; i < FGNetCtrls::FG_MAX_WHEELS; ++i ) {
155 node = fgGetNode("/controls/gear/wheel", i);
156 if ( node->getChild("brake") != 0 ) {
157 if ( tempnode->getChild("parking-brake")->getDoubleValue() > 0.0 ) {
161 = node->getChild("brake")->getDoubleValue();
168 node = fgGetNode("/controls/switches", true);
169 net->master_bat = node->getChild("master-bat")->getBoolValue();
170 net->master_alt = node->getChild("master-alt")->getBoolValue();
171 net->master_avionics = node->getChild("master-avionics")->getBoolValue();
173 net->wind_speed_kt = fgGetDouble("/environment/wind-speed-kt");
174 net->wind_dir_deg = fgGetDouble("/environment/wind-from-heading-deg");
176 // cur_fdm_state->get_ground_elev_ft() is what we want ... this
177 // reports the altitude of the aircraft.
178 // "/environment/ground-elevation-m" reports the ground elevation
179 // of the current view point which could change substantially if
180 // the user is switching views.
181 net->hground = cur_fdm_state->get_ground_elev_ft() * SG_FEET_TO_METER;
182 net->magvar = fgGetDouble("/environment/magnetic-variation-deg");
183 net->speedup = fgGetInt("/sim/speed-up");
185 if ( fgGetBool("/sim/freeze/master") ) {
188 if ( fgGetBool("/sim/freeze/position") ) {
191 if ( fgGetBool("/sim/freeze/fuel") ) {
195 if ( net_byte_order ) {
196 // convert to network byte order
197 net->version = htonl(net->version);
199 htond(net->elevator);
200 htond(net->elevator_trim);
203 net->flaps_power = htonl(net->flaps_power);
204 for ( i = 0; i < FGNetCtrls::FG_MAX_ENGINES; ++i ) {
205 htond(net->throttle[i]);
206 htond(net->mixture[i]);
207 net->fuel_pump_power[i] = htonl(net->fuel_pump_power[i]);
208 htond(net->prop_advance[i]);
209 net->magnetos[i] = htonl(net->magnetos[i]);
210 net->starter_power[i] = htonl(net->starter_power[i]);
212 net->num_engines = htonl(net->num_engines);
213 for ( i = 0; i < FGNetCtrls::FG_MAX_TANKS; ++i ) {
214 net->fuel_selector[i] = htonl(net->fuel_selector[i]);
216 net->num_tanks = htonl(net->num_tanks);
217 for ( i = 0; i < FGNetCtrls::FG_MAX_WHEELS; ++i ) {
218 htond(net->brake[i]);
220 net->num_wheels = htonl(net->num_wheels);
221 net->gear_handle = htonl(net->gear_handle);
222 net->master_bat = htonl(net->master_bat);
223 net->master_alt = htonl(net->master_alt);
224 net->master_avionics = htonl(net->master_avionics);
225 htond(net->wind_speed_kt);
226 htond(net->wind_dir_deg);
229 net->speedup = htonl(net->speedup);
230 net->freeze = htonl(net->freeze);
235 // Update the property tree from the FGNetCtrls structure.
236 void FGNetCtrls2Props( FGNetCtrls *net, bool net_byte_order ) {
239 SGPropertyNode * node;
241 if ( net_byte_order ) {
242 // convert from network byte order
243 net->version = htonl(net->version);
245 htond(net->elevator);
246 htond(net->elevator_trim);
249 net->flaps_power = htonl(net->flaps_power);
250 net->num_engines = htonl(net->num_engines);
251 for ( i = 0; i < net->num_engines; ++i ) {
252 net->magnetos[i] = htonl(net->magnetos[i]);
253 net->starter_power[i] = htonl(net->starter_power[i]);
254 htond(net->throttle[i]);
255 htond(net->mixture[i]);
256 net->fuel_pump_power[i] = htonl(net->fuel_pump_power[i]);
257 htond(net->prop_advance[i]);
259 net->num_tanks = htonl(net->num_tanks);
260 for ( i = 0; i < net->num_tanks; ++i ) {
261 net->fuel_selector[i] = htonl(net->fuel_selector[i]);
263 net->num_wheels = htonl(net->num_wheels);
264 for ( i = 0; i < net->num_wheels; ++i ) {
265 htond(net->brake[i]);
267 net->gear_handle = htonl(net->gear_handle);
268 net->master_bat = htonl(net->master_bat);
269 net->master_alt = htonl(net->master_alt);
270 net->master_avionics = htonl(net->master_avionics);
271 htond(net->wind_speed_kt);
272 htond(net->wind_dir_deg);
275 net->speedup = htonl(net->speedup);
276 net->freeze = htonl(net->freeze);
279 if ( net->version != FG_NET_CTRLS_VERSION ) {
280 SG_LOG( SG_IO, SG_ALERT,
281 "Version mismatch with raw controls packet format." );
282 SG_LOG( SG_IO, SG_ALERT,
283 "FlightGear needs version = " << FG_NET_CTRLS_VERSION
284 << " but is receiving version = " << net->version );
286 node = fgGetNode("/controls/flight", true);
287 node->setDoubleValue( "aileron", net->aileron );
288 node->setDoubleValue( "elevator", net->elevator );
289 node->setDoubleValue( "elevator-trim", net->elevator_trim );
290 node->setDoubleValue( "rudder", net->rudder );
291 node->setDoubleValue( "flaps", net->flaps );
293 fgSetBool( "/systems/electrical/outputs/flaps", net->flaps_power );
295 for ( i = 0; i < FGNetCtrls::FG_MAX_ENGINES; ++i ) {
296 node = fgGetNode("/controls/engines/engine", i);
297 node->getChild( "throttle" )->setDoubleValue( net->throttle[i] );
298 node->getChild( "mixture" )->setDoubleValue( net->mixture[i] );
299 node->getChild( "propeller-pitch" )
300 ->setDoubleValue( net->prop_advance[i] );
301 node->getChild( "magnetos" )->setDoubleValue( net->magnetos[i] );
304 fgSetBool( "/systems/electrical/outputs/fuel-pump",
305 net->fuel_pump_power[0] );
306 fgSetBool( "/systems/electrical/outputs/starter",
307 net->starter_power[0] );
309 for ( i = 0; i < FGNetCtrls::FG_MAX_TANKS; ++i ) {
310 node = fgGetNode( "/controls/fuel/tank", i );
311 node->getChild( "fuel-selector" )
312 ->setBoolValue( net->fuel_selector[i] );
314 for ( i = 0; i < FGNetCtrls::FG_MAX_WHEELS; ++i ) {
315 node = fgGetNode( "/controls/gear/wheel", i );
316 node->getChild( "brake" )->setDoubleValue( net->brake[i] );
319 node = fgGetNode( "/controls/gear", true );
320 node->setBoolValue( "gear-down", net->gear_handle );
322 node = fgGetNode( "/controls/switches", true );
323 node->setBoolValue( "master-bat", net->master_bat );
324 node->setBoolValue( "master-alt", net->master_alt );
325 node->setBoolValue( "master-avionics", net->master_avionics );
327 node = fgGetNode( "/environment", true );
328 node->setBoolValue( "wind-speed-kt", net->wind_speed_kt );
329 node->setBoolValue( "wind-from-heading-deg", net->wind_dir_deg );
330 node->setBoolValue( "magnetic-variation-deg", net->magvar );
332 // ground elevation ???
334 fgSetInt( "/sim/speed-up", net->speedup );
336 node = fgGetNode( "/sim/freeze", true );
337 node->setBoolValue( "master", net->freeze & 0x01 );
338 node->setBoolValue( "position", net->freeze & 0x02 );
339 node->setBoolValue( "fuel", net->freeze & 0x04 );
343 // process work for this port
344 bool FGNativeCtrls::process() {
345 SGIOChannel *io = get_io_channel();
346 int length = sizeof(FGNetCtrls);
348 if ( get_direction() == SG_IO_OUT ) {
349 // cout << "size of cur_fdm_state = " << length << endl;
351 FGProps2NetCtrls( &net_ctrls );
353 if ( ! io->write( (char *)(& net_ctrls), length ) ) {
354 SG_LOG( SG_IO, SG_ALERT, "Error writing data." );
357 } else if ( get_direction() == SG_IO_IN ) {
358 if ( io->get_type() == sgFileType ) {
359 if ( io->read( (char *)(& net_ctrls), length ) == length ) {
360 SG_LOG( SG_IO, SG_DEBUG, "Success reading data." );
361 FGNetCtrls2Props( &net_ctrls );
364 while ( io->read( (char *)(& net_ctrls), length ) == length ) {
365 SG_LOG( SG_IO, SG_DEBUG, "Success reading data." );
366 FGNetCtrls2Props( &net_ctrls );
376 bool FGNativeCtrls::close() {
377 SGIOChannel *io = get_io_channel();
379 set_enabled( false );
381 if ( ! io->close() ) {