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1 | [![Build Status](https://travis-ci.org/ibnfirnas/erlang-x_plane_data.svg?branch=master)](https://travis-ci.org/ibnfirnas/erlang-x_plane_data) |
2 | ||
3 | X-Plane UDP data parser | |
4 | ======================= | |
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6 | Examples |
7 | -------- | |
8 | ||
9 | ### Receive data packet | |
10 | ||
11 | ```erlang | |
12 | {ok, Socket} = gen_udp:open(Port, [binary, {active, false}]), | |
13 | {ok, {_, _, <<XPlaneDataPacket/binary>>}} = gen_udp:recv(Socket, 0), | |
14 | ``` | |
15 | ||
16 | ### Parse data packet | |
17 | ||
18 | ```erlang | |
84fa8ccb | 19 | {ok, {64=Index, GroupsRaw}=DataRaw} = x_plane_data_raw:of_bin(XPlaneDataPacket), |
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20 | ``` |
21 | ||
22 | ### Access parsed data | |
64c0d81f | 23 | |
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24 | #### Raw |
25 | ||
26 | At this stage, only the structure of the packet was parsed. No attempt at | |
27 | interpreting the values have been made: | |
28 | ||
64c0d81f | 29 | ```erlang |
25c95554 | 30 | % Speeds are in group 3 |
84fa8ccb | 31 | {3, Speeds} = lists:keyfind(3, 1, GroupsRaw), |
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32 | { VindKias |
33 | , VindKeas | |
34 | , VtrueKtas | |
35 | , VtrueKtgs | |
36 | , _ | |
37 | , VindMph | |
38 | , VtrueMphas | |
39 | , VtrueMphgs | |
40 | } = Speeds, | |
41 | ||
42 | % Pitch roll and headings values are in group 17 | |
84fa8ccb | 43 | {17, PitchRollHeadings} = lists:keyfind(17, 1, GroupsRaw), |
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44 | { PitchDeg |
45 | , RollDeg | |
46 | , HdingTrue | |
47 | , HdingMag | |
48 | , _ | |
49 | , _ | |
50 | , _ | |
51 | , _ | |
52 | } = PitchRollHeadings, | |
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53 | ``` |
54 | ||
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55 | #### Named |
56 | ||
57 | Here we identify what each of the numbered groups mean in a given X-Plane | |
58 | version. Right now only X-Plane 10 is supported and I only identified 3 groups | |
59 | so far: | |
60 | ||
61 | - index: `3` , name: `speeds` | |
62 | - index: `17`, name: `pitch_roll_heading` | |
63 | - index: `20`, name: `lat_lon_alt` | |
64 | ||
65 | Unidentified groups (with index other than what is listed above) will be | |
66 | absent from the list of named groups (think of `x_plane_data_named:of_raw/1` as | |
67 | a filter), so you'll have to access their raw version, if needed. | |
68 | ||
69 | ##### Identify | |
70 | ```erlang | |
71 | {ok, {x_plane_data_v10, GroupsNamed}} = x_plane_data_named:of_raw(DataRaw), | |
72 | ``` | |
73 | ||
74 | ##### Access | |
75 | ```erlang | |
76 | -include_lib("x_plane_data_group_lat_lon_alt.hrl"). | |
77 | -include_lib("x_plane_data_group_pitch_roll_heading.hrl"). | |
78 | -include_lib("x_plane_data_group_speeds.hrl"). | |
79 | ||
80 | ... | |
81 | ||
82 | {speeds, #x_plane_data_group_speeds | |
83 | { vind_kias = VindKias | |
84 | , vind_keas = VindKeas | |
85 | , vtrue_ktas = VtrueKtas | |
86 | , vtrue_ktgs = VtrueKtgs | |
87 | , vind_mph = VindMph | |
88 | , vtrue_mphas = VtrueMphas | |
89 | , vtrue_mphgs = VtrueMphgs | |
90 | } | |
91 | } = lists:keyfind(speeds, 1, GroupsNamed), | |
92 | ||
93 | {pitch_roll_heading, #x_plane_data_group_pitch_roll_heading | |
94 | { pitch_deg = PitchDeg | |
95 | , roll_deg = RollDeg | |
96 | , hding_true = HdingTrue | |
97 | , hding_mag = HdingMag | |
98 | } | |
99 | } = lists:keyfind(pitch_roll_heading, 1, GroupsNamed), | |
100 | ``` | |
101 | ||
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102 | Data format references |
103 | ---------------------- | |
104 | ||
105 | - http://b58.svglobe.com/data.html | |
106 | - http://www.nuclearprojects.com/xplane/xplaneref.html |