ardupilot/libraries/AP_WindVane/AP_WindVane.h

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/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <AP_Param/AP_Param.h>
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#include <AP_AHRS/AP_AHRS.h>
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#include <AP_SerialManager/AP_SerialManager.h>
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#define WINDVANE_DEFAULT_PIN 15 // default wind vane sensor analog pin
#define WINDSPEED_DEFAULT_SPEED_PIN 14 // default pin for reading speed from ModernDevice rev p wind sensor
#define WINDSPEED_DEFAULT_TEMP_PIN 13 // default pin for reading temperature from ModernDevice rev p wind sensor
#define WINDSPEED_DEFAULT_VOLT_OFFSET 1.346f // default voltage offset between speed and temp pins from ModernDevice rev p wind sensor
#define TACK_FILT_CUTOFF 0.1f // cutoff frequency in Hz used in low pass filter to determine the current tack
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class AP_WindVane_Backend;
class AP_WindVane
{
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friend class AP_WindVane_Backend;
friend class AP_WindVane_Home;
friend class AP_WindVane_Analog;
friend class AP_WindVane_SITL;
friend class AP_WindVane_ModernDevice;
friend class AP_WindVane_Airspeed;
friend class AP_WindVane_RPM;
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friend class AP_WindVane_NMEA;
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public:
AP_WindVane();
/* Do not allow copies */
AP_WindVane(const AP_WindVane &other) = delete;
AP_WindVane &operator=(const AP_WindVane&) = delete;
static AP_WindVane *get_singleton();
// return true if wind vane is enabled
bool enabled() const;
// return true if wind speed is enabled
bool wind_speed_enabled() const;
// Initialize the Wind Vane object and prepare it for use
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void init(const AP_SerialManager& serial_manager);
// update wind vane
void update();
// get the apparent wind direction in body-frame in radians, 0 = head to wind
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float get_apparent_wind_direction_rad() const {
return wrap_PI(_direction_apparent_ef - AP::ahrs().yaw);
}
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// get the true wind direction in radians, 0 = wind coming from north
float get_true_wind_direction_rad() const { return _direction_true; }
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// Return apparent wind speed
float get_apparent_wind_speed() const { return _speed_apparent; }
// Return true wind speed
float get_true_wind_speed() const { return _speed_true; }
// enum defining current tack
enum Sailboat_Tack {
TACK_PORT,
TACK_STARBOARD
};
// return the current tack
Sailboat_Tack get_current_tack() const { return _current_tack; }
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// record home heading for use as wind direction if no sensor is fitted
void record_home_heading() { _home_heading = AP::ahrs().yaw; }
// start calibration routine
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bool start_direction_calibration();
bool start_speed_calibration();
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// send mavlink wind message
void send_wind(mavlink_channel_t chan);
// parameter block
static const struct AP_Param::GroupInfo var_info[];
private:
// parameters
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AP_Int8 _direction_type; // type of windvane being used
AP_Int8 _rc_in_no; // RC input channel to use
AP_Int8 _dir_analog_pin; // analog pin connected to wind vane direction sensor
AP_Float _dir_analog_volt_min; // minimum voltage read by windvane
AP_Float _dir_analog_volt_max; // maximum voltage read by windvane
AP_Float _dir_analog_bearing_offset; // angle offset when windvane is indicating a headwind, ie 0 degress relative to vehicle
AP_Float _dir_analog_deadzone; // analog pot deadzone in degrees
AP_Float _dir_filt_hz; // vane Low pass filter frequency
AP_Int8 _calibration; // enter calibration
AP_Float _dir_speed_cutoff; // vane cutoff wind speed
AP_Int8 _speed_sensor_type; // wind speed sensor type
AP_Int8 _speed_sensor_speed_pin; // speed sensor analog pin for reading speed
AP_Float _speed_sensor_temp_pin; // speed sensor analog pin for reading temp, -1 if disable
AP_Float _speed_sensor_voltage_offset; // analog speed zero wind voltage offset
AP_Float _speed_filt_hz; // speed sensor low pass filter frequency
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AP_WindVane_Backend *_direction_driver;
AP_WindVane_Backend *_speed_driver;
// update wind speed sensor
void update_apparent_wind_speed();
// update apparent wind direction
void update_apparent_wind_direction();
// calculate true wind speed and direction from apparent wind
void update_true_wind_speed_and_direction();
// wind direction variables
float _direction_apparent_ef; // wind's apparent direction in radians (0 = ahead of vehicle) in earth frame
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float _direction_true; // wind's true direction in radians (0 = North)
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// wind speed variables
float _speed_apparent; // wind's apparent speed in m/s
float _speed_true; // wind's true estimated speed in m/s
// current tack
Sailboat_Tack _current_tack;
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// heading in radians recorded when vehicle was armed
float _home_heading;
enum WindVaneType {
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WINDVANE_NONE = 0,
WINDVANE_HOME_HEADING = 1,
WINDVANE_PWM_PIN = 2,
WINDVANE_ANALOG_PIN = 3,
WINDVANE_NMEA = 4,
WINDVANE_SITL_TRUE = 10,
WINDVANE_SITL_APPARENT = 11,
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};
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enum Speed_type {
WINDSPEED_NONE = 0,
WINDSPEED_AIRSPEED = 1,
WINDVANE_WIND_SENSOR_REV_P = 2,
WINDSPEED_RPM = 3,
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WINDSPEED_NMEA = 4,
WINDSPEED_SITL_TRUE = 10,
WINDSPEED_SITL_APPARENT = 11,
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};
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static AP_WindVane *_singleton;
};
namespace AP {
AP_WindVane *windvane();
};