// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- /// @file AP_MotorsMulticopter.h /// @brief Motor control class for Multicopters #ifndef __AP_MOTORS_MULTICOPTER_H__ #define __AP_MOTORS_MULTICOPTER_H__ #include "AP_Motors_Class.h" #define AP_MOTORS_DEFAULT_MIN_THROTTLE 130 #define AP_MOTORS_DEFAULT_MID_THROTTLE 500 #define AP_MOTORS_DEFAULT_MAX_THROTTLE 1000 #define AP_MOTORS_SPIN_WHEN_ARMED 70 // spin motors at this PWM value when armed #define AP_MOTORS_YAW_HEADROOM_DEFAULT 200 #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 #define AP_MOTORS_THST_EXPO_DEFAULT 0.5f // set to 0 for linear and 1 for second order approximation #define AP_MOTORS_THST_MAX_DEFAULT 0.95f // throttle which produces the maximum thrust. (i.e. 0 ~ 1 ) of the full throttle range #define AP_MOTORS_THST_BAT_MAX_DEFAULT 0.0f #define AP_MOTORS_THST_BAT_MIN_DEFAULT 0.0f #define AP_MOTORS_CURR_MAX_DEFAULT 0.0f // current limiting max default #define AP_MOTORS_BATT_VOLT_FILT_HZ 0.5f // battery voltage filtered at 0.5hz #define AP_MOTORS_THR_MIX_MIN_DEFAULT 0.1f // minimum throttle mix #define AP_MOTORS_THR_MIX_MID_DEFAULT 0.5f // manual throttle mix #define AP_MOTORS_THR_MIX_MAX_DEFAULT 0.9f // maximum throttle mix // To-Do: replace this hard coded counter with a timer #if HAL_CPU_CLASS < HAL_CPU_CLASS_75 || CONFIG_HAL_BOARD == HAL_BOARD_SITL || CONFIG_HAL_BOARD == HAL_BOARD_LINUX // slow start increments - throttle increase per (100hz) iteration. i.e. 5 = full speed in 2 seconds #define AP_MOTOR_SLOW_START_INCREMENT 10 // max throttle ramp speed (i.e. motors can reach full throttle in 1 second) #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) #else // slow start increments - throttle increase per (400hz) iteration. i.e. 1 = full speed in 2.5 seconds #define AP_MOTOR_SLOW_START_INCREMENT 3 // max throttle ramp speed (i.e. motors can reach full throttle in 0.8 seconds) #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) #endif /// @class AP_MotorsMulticopter class AP_MotorsMulticopter : public AP_Motors { public: // Constructor AP_MotorsMulticopter(uint16_t loop_rate, uint16_t speed_hz = AP_MOTORS_SPEED_DEFAULT); // output - sends commands to the motors virtual void output(); // set_yaw_headroom - set yaw headroom (yaw is given at least this amount of pwm) void set_yaw_headroom(int16_t pwm) { _yaw_headroom = pwm; } // set_throttle_thr_mix - set desired throttle_thr_mix (actual throttle_thr_mix is slewed towards this value over 1~2 seconds) // low values favour pilot/autopilot throttle over attitude control, high values favour attitude control over throttle // has no effect when throttle is above hover throttle void set_throttle_mix_min() { _throttle_thr_mix_desired = _thr_mix_min; } void set_throttle_mix_mid() { _throttle_thr_mix_desired = AP_MOTORS_THR_MIX_MID_DEFAULT; } void set_throttle_mix_max() { _throttle_thr_mix_desired = AP_MOTORS_THR_MIX_MAX_DEFAULT; } // get_throttle_thr_mix - get low throttle compensation value bool is_throttle_mix_min() const { return (_throttle_thr_mix < 1.25f*_thr_mix_min); } // returns warning throttle float get_throttle_warn() const { return rel_pwm_to_thr_range(_spin_when_armed); } int16_t throttle_min() const { return rel_pwm_to_thr_range(_min_throttle); } // 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) // also sets throttle channel minimum and maximum pwm void set_throttle_range(uint16_t min_throttle, int16_t radio_min, int16_t radio_max); // set_hover_throttle - sets the mid throttle which is close to the hover throttle of the copter // 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 void set_hover_throttle(uint16_t hov_thr) { _hover_out = hov_thr; } // slow_start - set to true to slew motors from current speed to maximum // Note: this must be set immediately before a step up in throttle void slow_start(bool true_false); // throttle_pass_through - passes provided pwm directly to all motors - dangerous but used for initialising ESCs // pwm value is an actual pwm value that will be output, normally in the range of 1000 ~ 2000 void throttle_pass_through(int16_t pwm); // get_lift_max - get maximum lift ratio - for logging purposes only float get_lift_max() { return _lift_max; } // get_batt_voltage_filt - get battery voltage ratio - for logging purposes only float get_batt_voltage_filt() const { return _batt_voltage_filt.get(); } // get_batt_resistance - get battery resistance approximation - for logging purposes only float get_batt_resistance() const { return _batt_resistance; } // get_throttle_limit - throttle limit ratio - for logging purposes only float get_throttle_limit() const { return _throttle_limit; } // var_info for holding Parameter information static const struct AP_Param::GroupInfo var_info[]; protected: // update the throttle input filter virtual void update_throttle_filter(); // update_max_throttle - updates the limits on _max_throttle for slow_start and current limiting flag void update_max_throttle(); // current_limit_max_throttle - current limit maximum throttle (called from update_max_throttle) void current_limit_max_throttle(); // apply_thrust_curve_and_volt_scaling - thrust curve and voltage adjusted pwm value (i.e. 1000 ~ 2000) int16_t apply_thrust_curve_and_volt_scaling(int16_t pwm_out, int16_t pwm_min, int16_t pwm_max) const; // update_lift_max_from_batt_voltage - used for voltage compensation void update_lift_max_from_batt_voltage(); // update_battery_resistance - calculate battery resistance when throttle is above hover_out void update_battery_resistance(); // update_throttle_thr_mix - updates thr_low_comp value towards the target void update_throttle_thr_mix(); // return gain scheduling gain based on voltage and air density float get_compensation_gain() const; // get_hover_throttle_as_pwm - converts hover throttle to pwm (i.e. range 1000 ~ 2000) int16_t get_hover_throttle_as_pwm() const; float rel_pwm_to_thr_range(float pwm) const; float thr_range_to_rel_pwm(float thr) const; // convert RPY and Throttle servo ranges from legacy controller scheme back into PWM values // RPY channels typically +/-45 degrees servo travel between +/-400 PWM // Throttle channel typically 0-1000 range converts to 1100-1900 PWM for final output signal to motors // ToDo: this should all be handled as floats +/- 1.0 instead of PWM and fake angle ranges float calc_roll_pwm() { return (_roll_control_input * _rpy_pwm_scalar); } float calc_pitch_pwm() { return (_pitch_control_input * _rpy_pwm_scalar); } float calc_yaw_pwm() { return (_yaw_control_input * _rpy_pwm_scalar); } int16_t calc_throttle_radio_output() { return (_throttle_control_input * _throttle_pwm_scalar) + _throttle_radio_min;} // flag bitmask struct { uint8_t slow_start : 1; // 1 if slow start is active uint8_t slow_start_low_end : 1; // 1 just after arming so we can ramp up the spin_when_armed value } _multicopter_flags; // parameters AP_Int16 _spin_when_armed; // used to control whether the motors always spin when armed. pwm value above radio_min AP_Int16 _yaw_headroom; // yaw control is given at least this pwm range AP_Float _thrust_curve_expo; // curve used to linearize pwm to thrust conversion. set to 0 for linear and 1 for second order approximation AP_Float _thrust_curve_max; // throttle which produces the maximum thrust. (i.e. 0 ~ 1 ) of the full throttle range AP_Float _batt_voltage_max; // maximum voltage used to scale lift AP_Float _batt_voltage_min; // minimum voltage used to scale lift AP_Float _batt_current_max; // current over which maximum throttle is limited AP_Float _thr_mix_min; // current over which maximum throttle is limited // internal variables bool motor_enabled[AP_MOTORS_MAX_NUM_MOTORS]; // true if motor is enabled int16_t _spin_when_armed_ramped; // equal to _spin_when_armed parameter but slowly ramped up from zero float _throttle_thr_mix_desired; // desired throttle_low_comp value, actual throttle_low_comp is slewed towards this value over 1~2 seconds float _throttle_thr_mix; // mix between throttle and hover throttle for 0 to 1 and ratio above hover throttle for >1 int16_t _min_throttle; // the minimum throttle to be sent to the motors when they're on (prevents motors stalling while flying) int16_t _max_throttle; // the maximum throttle to be sent to the motors (sometimes limited by slow start) int16_t _hover_out; // the estimated hover throttle as pct * 10 (i.e. 0 ~ 1000) // battery voltage, current and air pressure compensation variables float _batt_voltage_resting; // battery voltage reading at minimum throttle LowPassFilterFloat _batt_voltage_filt; // filtered battery voltage expressed as a percentage (0 ~ 1.0) of batt_voltage_max float _batt_current_resting; // battery's current when motors at minimum float _batt_resistance; // battery's resistance calculated by comparing resting voltage vs in flight voltage int16_t _batt_timer; // timer used in battery resistance calcs float _lift_max; // maximum lift ratio from battery voltage float _throttle_limit; // ratio of throttle limit between hover and maximum }; #endif // __AP_MOTORS_MULTICOPTER_H__