1 // net_fdm.hxx -- defines a common net I/O interface to the flight 2 // dynamics model 3 // 4 // Written by Curtis Olson - http://www.flightgear.org/~curt 5 // Started September 2001. 6 // 7 // This file is in the Public Domain, and comes with no warranty. 8 // 9 // $Id: net_fdm.hxx,v 1.6 2013/11/09 14:06:36 bcoconni Exp $ 10 11 12 #ifndef _NET_FDM_HXX 13 #define _NET_FDM_HXX 14 15 16 #include <time.h> // time_t 17 #include <simgear/misc/stdint.hxx> 18 19 // NOTE: this file defines an external interface structure. Due to 20 // variability between platforms and architectures, we only used fixed 21 // length types here. Specifically, integer types can vary in length. 22 // I am not aware of any platforms that don't use 4 bytes for float 23 // and 8 bytes for double. 24 25 const uint32_t FG_NET_FDM_VERSION = 24; 26 27 28 // Define a structure containing the top level flight dynamics model 29 // parameters 30 31 class FGNetFDM { 32 33 public: 34 35 enum { 36 FG_MAX_ENGINES = 4, 37 FG_MAX_WHEELS = 3, 38 FG_MAX_TANKS = 4 39 }; 40 41 uint32_t version; // increment when data values change 42 uint32_t padding; // padding 43 44 // Positions 45 double longitude; // geodetic (radians) 46 double latitude; // geodetic (radians) 47 double altitude; // above sea level (meters) 48 float agl; // above ground level (meters) 49 float phi; // roll (radians) 50 float theta; // pitch (radians) 51 float psi; // yaw or true heading (radians) 52 float alpha; // angle of attack (radians) 53 float beta; // side slip angle (radians) 54 55 // Velocities 56 float phidot; // roll rate (radians/sec) 57 float thetadot; // pitch rate (radians/sec) 58 float psidot; // yaw rate (radians/sec) 59 float vcas; // calibrated airspeed 60 float climb_rate; // feet per second 61 float v_north; // north velocity in local/body frame, fps 62 float v_east; // east velocity in local/body frame, fps 63 float v_down; // down/vertical velocity in local/body frame, fps 64 float v_body_u; // ECEF velocity in body axis 65 float v_body_v; // ECEF velocity in body axis 66 float v_body_w; // ECEF velocity in body axis 67 68 // Accelerations 69 float A_X_pilot; // X accel in body frame ft/sec^2 70 float A_Y_pilot; // Y accel in body frame ft/sec^2 71 float A_Z_pilot; // Z accel in body frame ft/sec^2 72 73 // Stall 74 float stall_warning; // 0.0 - 1.0 indicating the amount of stall 75 float slip_deg; // slip ball deflection 76 77 // Pressure 78 79 // Engine status 80 uint32_t num_engines; // Number of valid engines 81 uint32_t eng_state[FG_MAX_ENGINES];// Engine state (off, cranking, running) 82 float rpm[FG_MAX_ENGINES]; // Engine RPM rev/min 83 float fuel_flow[FG_MAX_ENGINES]; // Fuel flow gallons/hr 84 float fuel_px[FG_MAX_ENGINES]; // Fuel pressure psi 85 float egt[FG_MAX_ENGINES]; // Exhuast gas temp deg F 86 float cht[FG_MAX_ENGINES]; // Cylinder head temp deg F 87 float mp_osi[FG_MAX_ENGINES]; // Manifold pressure 88 float tit[FG_MAX_ENGINES]; // Turbine Inlet Temperature 89 float oil_temp[FG_MAX_ENGINES]; // Oil temp deg F 90 float oil_px[FG_MAX_ENGINES]; // Oil pressure psi 91 92 // Consumables 93 uint32_t num_tanks; // Max number of fuel tanks 94 float fuel_quantity[FG_MAX_TANKS]; 95 96 // Gear status 97 uint32_t num_wheels; 98 uint32_t wow[FG_MAX_WHEELS]; 99 float gear_pos[FG_MAX_WHEELS]; 100 float gear_steer[FG_MAX_WHEELS]; 101 float gear_compression[FG_MAX_WHEELS]; 102 103 // Environment 104 uint32_t cur_time; // current unix time 105 // FIXME: make this uint64_t before 2038 106 int32_t warp; // offset in seconds to unix time 107 float visibility; // visibility in meters (for env. effects) 108 109 // Control surface positions (normalized values) 110 float elevator; 111 float elevator_trim_tab; 112 float left_flap; 113 float right_flap; 114 float left_aileron; 115 float right_aileron; 116 float rudder; 117 float nose_wheel; 118 float speedbrake; 119 float spoilers; 120 }; 121 122 123 #endif // _NET_FDM_HXX 124