135 lines
8.1 KiB
C++
135 lines
8.1 KiB
C++
// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
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/// @file AP_Motors_Multirotor.h
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/// @brief Motor control class for Multirotors
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#ifndef __AP_MOTORS_MULTIROTOR_H__
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#define __AP_MOTORS_MULTIROTOR_H__
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#include "AP_Motors_Class.h"
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#define AP_MOTORS_SPIN_WHEN_ARMED 70 // spin motors at this PWM value when armed
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#define AP_MOTORS_YAW_HEADROOM_DEFAULT 200
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#define AP_MOTORS_THR_LOW_CMP_DEFAULT 0.5f // ratio controlling the max throttle output during competing requests of low throttle from the pilot (or autopilot) and higher throttle for attitude control. Higher favours Attitude over pilot input
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#define AP_MOTORS_THST_EXPO_DEFAULT 0.5f // set to 0 for linear and 1 for second order approximation
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#define AP_MOTORS_THST_MAX_DEFAULT 0.95f // throttle which produces the maximum thrust. (i.e. 0 ~ 1 ) of the full throttle range
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#define AP_MOTORS_THST_BAT_MAX_DEFAULT 0.0f
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#define AP_MOTORS_THST_BAT_MIN_DEFAULT 0.0f
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#define AP_MOTORS_CURR_MAX_DEFAULT 0.0f // current limiting max default
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#define AP_MOTORS_BATT_VOLT_FILT_HZ 0.5f // battery voltage filtered at 0.5hz
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#define AP_MOTORS_THR_MIX_MIN_DEFAULT 0.1f // minimum throttle mix
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#define AP_MOTORS_THR_MIX_MID_DEFAULT 0.5f // manual throttle mix
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#define AP_MOTORS_THR_MIX_MAX_DEFAULT 0.9f // maximum throttle mix
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// To-Do: replace this hard coded counter with a timer
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#if HAL_CPU_CLASS < HAL_CPU_CLASS_75 || CONFIG_HAL_BOARD == HAL_BOARD_SITL || CONFIG_HAL_BOARD == HAL_BOARD_LINUX
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// slow start increments - throttle increase per (100hz) iteration. i.e. 5 = full speed in 2 seconds
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#define AP_MOTOR_SLOW_START_INCREMENT 10 // max throttle ramp speed (i.e. motors can reach full throttle in 1 second)
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#define AP_MOTOR_SLOW_START_LOW_END_INCREMENT 2 // min throttle ramp speed (i.e. motors will speed up from zero to _spin_when_armed speed in about 1 second)
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#else
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// slow start increments - throttle increase per (400hz) iteration. i.e. 1 = full speed in 2.5 seconds
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#define AP_MOTOR_SLOW_START_INCREMENT 3 // max throttle ramp speed (i.e. motors can reach full throttle in 0.8 seconds)
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#define AP_MOTOR_SLOW_START_LOW_END_INCREMENT 1 // min throttle ramp speed (i.e. motors will speed up from zero to _spin_when_armed speed in about 0.3 second)
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#endif
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/// @class AP_Motors_Multirotor
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class AP_Motors_Multirotor :public AP_Motors {
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public:
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// Constructor
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AP_Motors_Multirotor(uint16_t loop_rate, uint16_t speed_hz = AP_MOTORS_SPEED_DEFAULT);
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// output - sends commands to the motors
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virtual void output();
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// get_hover_throttle_as_pwm - converts hover throttle to pwm (i.e. range 1000 ~ 2000)
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int16_t get_hover_throttle_as_pwm() const;
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// set_yaw_headroom - set yaw headroom (yaw is given at least this amount of pwm)
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virtual void set_yaw_headroom(int16_t pwm) { _yaw_headroom = pwm; }
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// set_throttle_thr_mix - set desired throttle_thr_mix (actual throttle_thr_mix is slewed towards this value over 1~2 seconds)
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// low values favour pilot/autopilot throttle over attitude control, high values favour attitude control over throttle
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// has no effect when throttle is above hover throttle
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void set_throttle_mix_min() { _throttle_thr_mix_desired = _thr_mix_min; }
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void set_throttle_mix_mid() { _throttle_thr_mix_desired = AP_MOTORS_THR_MIX_MID_DEFAULT; }
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void set_throttle_mix_max() { _throttle_thr_mix_desired = AP_MOTORS_THR_MIX_MAX_DEFAULT; }
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// get_throttle_thr_mix - get low throttle compensation value
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bool is_throttle_mix_min() { return (_throttle_thr_mix < 1.25f*_thr_mix_min); }
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// returns warning throttle
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float get_throttle_warn() { return rel_pwm_to_thr_range(_spin_when_armed); }
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int16_t throttle_min() const { return _min_throttle;}
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int16_t throttle_max() const { return _max_throttle;}
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// set_throttle_range - sets the minimum throttle that will be sent to the engines when they're not off (i.e. to prevents issues with some motors spinning and some not at very low throttle)
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// also sets throttle channel minimum and maximum pwm
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void set_throttle_range(uint16_t min_throttle, int16_t radio_min, int16_t radio_max);
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// set_hover_throttle - sets the mid throttle which is close to the hover throttle of the copter
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// this is used to limit the amount that the stability patch will increase the throttle to give more room for roll, pitch and yaw control
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void set_hover_throttle(uint16_t hov_thr) { _hover_out = hov_thr; }
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// slow_start - set to true to slew motors from current speed to maximum
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// Note: this must be set immediately before a step up in throttle
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void slow_start(bool true_false);
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// throttle_pass_through - passes provided pwm directly to all motors - dangerous but used for initialising ESCs
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// pwm value is an actual pwm value that will be output, normally in the range of 1000 ~ 2000
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void throttle_pass_through(int16_t pwm);
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// var_info for holding Parameter information
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static const struct AP_Param::GroupInfo var_info[];
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protected:
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// update the throttle input filter
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virtual void update_throttle_filter();
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// update_max_throttle - updates the limits on _max_throttle for slow_start and current limiting flag
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void update_max_throttle();
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// current_limit_max_throttle - current limit maximum throttle (called from update_max_throttle)
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void current_limit_max_throttle();
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// apply_thrust_curve_and_volt_scaling - thrust curve and voltage adjusted pwm value (i.e. 1000 ~ 2000)
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int16_t apply_thrust_curve_and_volt_scaling(int16_t pwm_out, int16_t pwm_min, int16_t pwm_max) const;
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// update_lift_max_from_batt_voltage - used for voltage compensation
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void update_lift_max_from_batt_voltage();
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// update_battery_resistance - calculate battery resistance when throttle is above hover_out
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void update_battery_resistance();
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// update_throttle_thr_mix - updates thr_low_comp value towards the target
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void update_throttle_thr_mix();
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// return gain scheduling gain based on voltage and air density
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float get_compensation_gain() const;
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float rel_pwm_to_thr_range(float pwm) const;
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float thr_range_to_rel_pwm(float thr) const;
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// parameters
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AP_Int16 _spin_when_armed; // used to control whether the motors always spin when armed. pwm value above radio_min
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AP_Int16 _yaw_headroom; // yaw control is given at least this pwm range
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AP_Float _thrust_curve_expo; // curve used to linearize pwm to thrust conversion. set to 0 for linear and 1 for second order approximation
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AP_Float _thrust_curve_max; // throttle which produces the maximum thrust. (i.e. 0 ~ 1 ) of the full throttle range
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AP_Float _batt_voltage_max; // maximum voltage used to scale lift
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AP_Float _batt_voltage_min; // minimum voltage used to scale lift
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AP_Float _batt_current_max; // current over which maximum throttle is limited
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AP_Float _thr_mix_min; // current over which maximum throttle is limited
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// internal variables
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float _throttle_thr_mix_desired; // desired throttle_low_comp value, actual throttle_low_comp is slewed towards this value over 1~2 seconds
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float _throttle_thr_mix; // mix between throttle and hover throttle for 0 to 1 and ratio above hover throttle for >1
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int16_t _min_throttle; // the minimum throttle to be sent to the motors when they're on (prevents motors stalling while flying)
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int16_t _max_throttle; // the maximum throttle to be sent to the motors (sometimes limited by slow start)
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int16_t _hover_out; // the estimated hover throttle as pct * 10 (i.e. 0 ~ 1000)
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};
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#endif // __AP_MOTORS_MULTIROTOR_H__
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