ardupilot/libraries/AP_HAL_SITL/SITL_State.h

#ifndef __AP_HAL_SITL_STATE_H__
#define __AP_HAL_SITL_STATE_H__

#include <AP_HAL/AP_HAL.h>

#if CONFIG_HAL_BOARD == HAL_BOARD_SITL

#include "AP_HAL_SITL.h"
#include "AP_HAL_SITL_Namespace.h"
#include "HAL_SITL_Class.h"
#include "RCInput.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/udp.h>
#include <arpa/inet.h>

#include <AP_Baro/AP_Baro.h>
#include <AP_InertialSensor/AP_InertialSensor.h>
#include <AP_Compass/Compass.h>
#include <AP_OpticalFlow/AP_OpticalFlow.h>
#include <AP_Terrain/AP_Terrain.h>
#include <SITL/SITL.h>
#include <SITL/SIM_Gimbal.h>
#include <SITL/SIM_ADSB.h>
#include <AP_HAL/utility/Socket.h>

class HAL_SITL;

class HALSITL::SITL_State {
    friend class HALSITL::SITLScheduler;
    friend class HALSITL::SITLUtil;
public:
    void init(int argc, char * const argv[]);

    enum vehicle_type {
        ArduCopter,
        APMrover2,
        ArduPlane
    };

    int gps_pipe(void);
    int gps2_pipe(void);
    ssize_t gps_read(int fd, void *buf, size_t count);
    uint16_t pwm_output[SITL_NUM_CHANNELS];
    uint16_t last_pwm_output[SITL_NUM_CHANNELS];
    uint16_t pwm_input[SITL_RC_INPUT_CHANNELS];
    bool new_rc_input;
    void loop_hook(void);
    uint16_t base_port(void) const {
        return _base_port;
    }

    // simulated airspeed, sonar and battery monitor
    uint16_t sonar_pin_value;    // pin 0
    uint16_t airspeed_pin_value; // pin 1
    uint16_t voltage_pin_value;  // pin 13
    uint16_t current_pin_value;  // pin 12

    // return TCP client address for uartC
    const char *get_client_address(void) const { return _client_address; }

    // paths for UART devices
    const char *_uart_path[5] {
        "tcp:0:wait",
        "GPS1",
        "tcp:2",
        "tcp:3",
        "GPS2"
    };
    
private:
    void _parse_command_line(int argc, char * const argv[]);
    void _set_param_default(const char *parm);
    void _usage(void);
    void _sitl_setup(const char *home_str);
    void _setup_fdm(void);
    void _setup_timer(void);
    void _setup_adc(void);

    float height_agl(void);
    void _update_barometer(float height);
    void _update_compass(float rollDeg, float pitchDeg, float yawDeg);
    void _update_flow(void);

    struct gps_data {
        double latitude;
        double longitude;
        float altitude;
        double speedN;
        double speedE;
        double speedD;
        bool have_lock;
    };

#define MAX_GPS_DELAY 100
    gps_data _gps_data[MAX_GPS_DELAY];

    bool _gps_has_basestation_position;
    gps_data _gps_basestation_data;
    void _gps_write(const uint8_t *p, uint16_t size);
    void _gps_send_ubx(uint8_t msgid, uint8_t *buf, uint16_t size);
    void _update_gps_ubx(const struct gps_data *d);
    void _update_gps_mtk(const struct gps_data *d);
    void _update_gps_mtk16(const struct gps_data *d);
    void _update_gps_mtk19(const struct gps_data *d);
    uint16_t _gps_nmea_checksum(const char *s);
    void _gps_nmea_printf(const char *fmt, ...);
    void _update_gps_nmea(const struct gps_data *d);
    void _sbp_send_message(uint16_t msg_type, uint16_t sender_id, uint8_t len, uint8_t *payload);
    void _update_gps_sbp(const struct gps_data *d);
    void _update_gps_file(const struct gps_data *d);

    void _update_gps(double latitude, double longitude, float altitude,
                     double speedN, double speedE, double speedD, bool have_lock);

    void _update_ins(float roll, 	float pitch, 	float yaw,		// Relative to earth
                     double rollRate, 	double pitchRate,double yawRate,	// Local to plane
                     double xAccel, 	double yAccel, 	double zAccel,		// Local to plane
                     float airspeed,	float altitude);
    void _fdm_input(void);
    void _fdm_input_local(void);
    void _output_to_flightgear(void);
    void _simulator_servos(SITL::Aircraft::sitl_input &input);
    void _simulator_output(bool synthetic_clock_mode);
    void _apply_servo_filter(float deltat);
    uint16_t _airspeed_sensor(float airspeed);
    uint16_t _ground_sonar();
    float _rand_float(void);
    Vector3f _rand_vec3f(void);
    void _fdm_input_step(void);

    void wait_clock(uint64_t wait_time_usec);

    // internal state
    enum vehicle_type _vehicle;
    uint16_t _framerate;
    uint8_t _instance;
    uint16_t _base_port;
    struct sockaddr_in _rcout_addr;
    pid_t _parent_pid;
    uint32_t _update_count;

    AP_Baro *_barometer;
    AP_InertialSensor *_ins;
    SITLScheduler *_scheduler;
    Compass *_compass;
    OpticalFlow *_optical_flow;
    AP_Terrain *_terrain;

    SocketAPM _sitl_rc_in{true};
    SITL::SITL *_sitl;
    uint16_t _rcout_port;
    uint16_t _simin_port;
    float _current;

    bool _synthetic_clock_mode;

    const char *_fdm_address;

    // delay buffer variables
    static const uint8_t mag_buffer_length = 250;
    static const uint8_t wind_buffer_length = 50;
    static const uint8_t baro_buffer_length = 50;

    // magnetometer delay buffer variables
    struct readings_mag {
        uint32_t time;
        Vector3f data;
    };
    uint8_t store_index_mag;
    uint32_t last_store_time_mag;
    VectorN<readings_mag,mag_buffer_length> buffer_mag;
    uint32_t time_delta_mag;
    uint32_t delayed_time_mag;

    // airspeed sensor delay buffer variables
    struct readings_wind {
        uint32_t time;
        float data;
    };
    uint8_t store_index_wind;
    uint32_t last_store_time_wind;
    VectorN<readings_wind,wind_buffer_length> buffer_wind;
    uint32_t time_delta_wind;
    uint32_t delayed_time_wind;

    // barometer delay buffer variables
    struct readings_baro {
        uint32_t time;
        float data;
    };
    uint8_t store_index_baro;
    uint32_t last_store_time_baro;
    VectorN<readings_baro,baro_buffer_length> buffer_baro;
    uint32_t time_delta_baro;
    uint32_t delayed_time_baro;

    // internal SITL model
    SITL::Aircraft *sitl_model;

    // simulated gimbal
    bool enable_gimbal;
    SITL::Gimbal *gimbal;

    // simulated gimbal
    bool enable_ADSB;
    SITL::ADSB *adsb;

    // output socket for flightgear viewing
    SocketAPM fg_socket{true};
    
    // TCP address to connect uartC to
    const char *_client_address;

    const char *defaults_path = HAL_PARAM_DEFAULTS_PATH;
};

#endif // CONFIG_HAL_BOARD == HAL_BOARD_SITL
#endif // __AP_HAL_SITL_STATE_H__