FlightGear Forum
I'm trying to interface FlightGear and Simulink. Essentially, I want to use FlightGear to calculate flight dynamics, and I want Simulink to send control inputs (such as thrust and elevator position) and receive air data back.
Unfortunately, the Simulink Aerospace blockset seems to be built for the exact opposite purpose: Calculating flight dynamics in Simulink and using FlightGear just for visuals. The weirdest thing is that the "Pack net_fdm Packet for FlightGear" block (https://www.mathworks.com/help/aeroblks/packnet_fdmpacketforflightgear.html) forces me to specify even parameters such as longitude, latitude, roll, pitch, yaw and altitude, otherwise it sends zero values for those parameters and the airplane ends up teleporting underwater somewhere at the equator. Which is ridiculous. As a result, it is unusable for control input.
So I was able to get Simulink to receive UDP output from FG using a separate solution, but sending input isn't working. I'm using the UDP Send, Byte Reversal and Byte Pack blocks and I'm getting a Warning: read() not enough bytes error.
Here's my batch file:
- Code: Select all
@C:
@cd "C:\Program Files\FlightGear 2016.3.1"
@SET FG_ROOT=data
.\\bin\fgfs ^
--httpd=5400 ^
--aircraft=777-200ER ^
--airport=SBGL ^
--disable-random-objects ^
--prop:/sim/rendering/random-vegetation=false ^
--disable-specular-highlight ^
--disable-ai-models ^
--disable-real-weather-fetch ^
--disable-clouds ^
--prop:/sim/frame-rate-throttle-hz=60 ^
--fog-disable ^
--geometry=1024x768 ^
--bpp=32 ^
--offset-distance=0 ^
--altitude=0 ^
--heading=100 ^
--offset-azimuth=0 ^
--log-level=debug ^
--prop:/sim/rendering/multithreading-mode=DrawThreadPerContext ^
--native-fdm=socket,out,30,127.0.0.1,5502,udp ^
--generic=socket,in,30,127.0.0.1,5500,udp,control
And here's my protocol file (in data/Protocol):
- Code: Select all
<?xml version="1.0"?>
<PropertyList>
<generic>
<input>
<binary_mode>true</binary_mode>
<!--binary_footer>magic,0x12345678</binary_footer-->
<chunk>
<name>throttleright</name>
<type>double</type>
<node>/controls/engines/engine</node>
</chunk>
<chunk>
<name>throttleleft</name>
<type>double</type>
<node>/controls/engines/engine[1]</node>
</chunk>
<chunk>
<name>elevator</name>
<type>double</type>
<node>/controls/flight/elevator</node>
</chunk>
<chunk>
<name>aileron</name>
<type>double</type>
<node>/controls/flight/aileron</node>
</chunk>
<chunk>
<name>flaps</name>
<type>double</type>
<node>/controls/flight/flaps</node>
</chunk>
<chunk>
<name>AP</name>
<type>bool</type>
<node>/instrumentation/afds/inputs/AP</node>
</chunk>
<chunk>
<name>actual-target-altitude</name>
<type>double</type>
<node>/autopilot/settings/actual-target-altitude-ft</node>
</chunk>
<chunk>
<name>counter-set-altitude</name>
<type>double</type>
<node>/autopilot/settings/counter-set-altitude-ft</node>
</chunk>
<binary_footer>none</binary_footer>
</input>
</generic>
</PropertyList>
Has anyone managed to get this to work before?
