#pragma once // Gyro and Accelerometer calibration criteria #define AP_INERTIAL_SENSOR_ACCEL_TOT_MAX_OFFSET_CHANGE 4.0f #define AP_INERTIAL_SENSOR_ACCEL_MAX_OFFSET 250.0f #define AP_INERTIAL_SENSOR_ACCEL_CLIP_THRESH_MSS (15.5f*GRAVITY_MSS) // accelerometer values over 15.5G are recorded as a clipping error #define AP_INERTIAL_SENSOR_ACCEL_VIBE_FLOOR_FILT_HZ 5.0f // accel vibration floor filter hz #define AP_INERTIAL_SENSOR_ACCEL_VIBE_FILT_HZ 2.0f // accel vibration filter hz #define AP_INERTIAL_SENSOR_ACCEL_PEAK_DETECT_TIMEOUT_MS 500 // peak-hold detector timeout /** maximum number of INS instances available on this platform. If more than 1 then redundant sensors may be available */ #define INS_MAX_INSTANCES 3 #define INS_MAX_BACKENDS 6 #define INS_VIBRATION_CHECK_INSTANCES 2 #include #include #include #include #include #include class AP_InertialSensor_Backend; class AuxiliaryBus; /* forward declare DataFlash class. We can't include DataFlash.h because of mutual dependencies */ class DataFlash_Class; /* AP_InertialSensor is an abstraction for gyro and accel measurements * which are correctly aligned to the body axes and scaled to SI units. * * Gauss-Newton accel calibration routines borrowed from Rolfe Schmidt * blog post describing the method: http://chionophilous.wordpress.com/2011/10/24/accelerometer-calibration-iv-1-implementing-gauss-newton-on-an-atmega/ * original sketch available at http://rolfeschmidt.com/mathtools/skimetrics/adxl_gn_calibration.pde */ class AP_InertialSensor : AP_AccelCal_Client { friend class AP_InertialSensor_Backend; public: AP_InertialSensor(); static AP_InertialSensor *get_instance(); enum Gyro_Calibration_Timing { GYRO_CAL_NEVER = 0, GYRO_CAL_STARTUP_ONLY = 1 }; /// Perform startup initialisation. /// /// Called to initialise the state of the IMU. /// /// Gyros will be calibrated unless INS_GYRO_CAL is zero /// /// @param style The initialisation startup style. /// void init(uint16_t sample_rate_hz); /// Register a new gyro/accel driver, allocating an instance /// number uint8_t register_gyro(uint16_t raw_sample_rate_hz, uint32_t id); uint8_t register_accel(uint16_t raw_sample_rate_hz, uint32_t id); bool calibrate_trim(float &trim_roll, float &trim_pitch); /// calibrating - returns true if the gyros or accels are currently being calibrated bool calibrating() const { return _calibrating; } /// Perform cold-start initialisation for just the gyros. /// /// @note This should not be called unless ::init has previously /// been called, as ::init may perform other work /// void init_gyro(void); /// Fetch the current gyro values /// /// @returns vector of rotational rates in radians/sec /// const Vector3f &get_gyro(uint8_t i) const { return _gyro[i]; } const Vector3f &get_gyro(void) const { return get_gyro(_primary_gyro); } // set gyro offsets in radians/sec const Vector3f &get_gyro_offsets(uint8_t i) const { return _gyro_offset[i]; } const Vector3f &get_gyro_offsets(void) const { return get_gyro_offsets(_primary_gyro); } //get delta angle if available bool get_delta_angle(uint8_t i, Vector3f &delta_angle) const; bool get_delta_angle(Vector3f &delta_angle) const { return get_delta_angle(_primary_gyro, delta_angle); } float get_delta_angle_dt(uint8_t i) const; float get_delta_angle_dt() const { return get_delta_angle_dt(_primary_accel); } //get delta velocity if available bool get_delta_velocity(uint8_t i, Vector3f &delta_velocity) const; bool get_delta_velocity(Vector3f &delta_velocity) const { return get_delta_velocity(_primary_accel, delta_velocity); } float get_delta_velocity_dt(uint8_t i) const; float get_delta_velocity_dt() const { return get_delta_velocity_dt(_primary_accel); } /// Fetch the current accelerometer values /// /// @returns vector of current accelerations in m/s/s /// const Vector3f &get_accel(uint8_t i) const { return _accel[i]; } const Vector3f &get_accel(void) const { return get_accel(_primary_accel); } uint32_t get_gyro_error_count(uint8_t i) const { return _gyro_error_count[i]; } uint32_t get_accel_error_count(uint8_t i) const { return _accel_error_count[i]; } // multi-device interface bool get_gyro_health(uint8_t instance) const { return (instance<_gyro_count) ? _gyro_healthy[instance] : false; } bool get_gyro_health(void) const { return get_gyro_health(_primary_gyro); } bool get_gyro_health_all(void) const; uint8_t get_gyro_count(void) const { return _gyro_count; } bool gyro_calibrated_ok(uint8_t instance) const { return _gyro_cal_ok[instance]; } bool gyro_calibrated_ok_all() const; bool use_gyro(uint8_t instance) const; Gyro_Calibration_Timing gyro_calibration_timing() { return (Gyro_Calibration_Timing)_gyro_cal_timing.get(); } bool get_accel_health(uint8_t instance) const { return (instance<_accel_count) ? _accel_healthy[instance] : false; } bool get_accel_health(void) const { return get_accel_health(_primary_accel); } bool get_accel_health_all(void) const; uint8_t get_accel_count(void) const { return _accel_count; } bool accel_calibrated_ok_all() const; bool use_accel(uint8_t instance) const; // get accel offsets in m/s/s const Vector3f &get_accel_offsets(uint8_t i) const { return _accel_offset[i]; } const Vector3f &get_accel_offsets(void) const { return get_accel_offsets(_primary_accel); } // get accel scale const Vector3f &get_accel_scale(uint8_t i) const { return _accel_scale[i]; } const Vector3f &get_accel_scale(void) const { return get_accel_scale(_primary_accel); } // return a 3D vector defining the position offset of the IMU accelerometer in metres relative to the body frame origin const Vector3f &get_imu_pos_offset(uint8_t instance) const { return _accel_pos[instance]; } const Vector3f &get_imu_pos_offset(void) const { return _accel_pos[_primary_accel]; } // return the temperature if supported. Zero is returned if no // temperature is available float get_temperature(uint8_t instance) const { return _temperature[instance]; } /* get_delta_time returns the time period in seconds * overwhich the sensor data was collected */ float get_delta_time() const { return _delta_time; } // return the maximum gyro drift rate in radians/s/s. This // depends on what gyro chips are being used float get_gyro_drift_rate(void) const { return ToRad(0.5f/60); } // update gyro and accel values from accumulated samples void update(void); // wait for a sample to be available void wait_for_sample(void); // class level parameters static const struct AP_Param::GroupInfo var_info[]; // set overall board orientation void set_board_orientation(enum Rotation orientation) { _board_orientation = orientation; } // return the selected sample rate uint16_t get_sample_rate(void) const { return _sample_rate; } // return the main loop delta_t in seconds float get_loop_delta_t(void) const { return _loop_delta_t; } uint16_t error_count(void) const { return 0; } bool healthy(void) const { return get_gyro_health() && get_accel_health(); } uint8_t get_primary_accel(void) const { return _primary_accel; } uint8_t get_primary_gyro(void) const { return _primary_gyro; } // enable HIL mode void set_hil_mode(void) { _hil_mode = true; } // get the gyro filter rate in Hz uint8_t get_gyro_filter_hz(void) const { return _gyro_filter_cutoff; } // get the accel filter rate in Hz uint8_t get_accel_filter_hz(void) const { return _accel_filter_cutoff; } // pass in a pointer to DataFlash for raw data logging void set_dataflash(DataFlash_Class *dataflash) { _dataflash = dataflash; } // enable/disable raw gyro/accel logging void set_raw_logging(bool enable) { _log_raw_data = enable; } // calculate vibration levels and check for accelerometer clipping (called by a backends) void calc_vibration_and_clipping(uint8_t instance, const Vector3f &accel, float dt); // retrieve latest calculated vibration levels Vector3f get_vibration_levels() const { return get_vibration_levels(_primary_accel); } Vector3f get_vibration_levels(uint8_t instance) const; // retrieve and clear accelerometer clipping count uint32_t get_accel_clip_count(uint8_t instance) const; // check for vibration movement. True when all axis show nearly zero movement bool is_still(); /* HIL set functions. The minimum for HIL is set_accel() and set_gyro(). The others are option for higher fidelity log playback */ void set_accel(uint8_t instance, const Vector3f &accel); void set_gyro(uint8_t instance, const Vector3f &gyro); void set_delta_time(float delta_time); void set_delta_velocity(uint8_t instance, float deltavt, const Vector3f &deltav); void set_delta_angle(uint8_t instance, const Vector3f &deltaa, float deltaat); AuxiliaryBus *get_auxiliary_bus(int16_t backend_id) { return get_auxiliary_bus(backend_id, 0); } AuxiliaryBus *get_auxiliary_bus(int16_t backend_id, uint8_t instance); void detect_backends(void); // accel peak hold detector void set_accel_peak_hold(uint8_t instance, const Vector3f &accel); float get_accel_peak_hold_neg_x() const { return _peak_hold_state.accel_peak_hold_neg_x; } //Returns accel calibrator interface object pointer AP_AccelCal* get_acal() const { return _acal; } // Returns body fixed accelerometer level data averaged during accel calibration's first step bool get_fixed_mount_accel_cal_sample(uint8_t sample_num, Vector3f& ret) const; // Returns primary accelerometer level data averaged during accel calibration's first step bool get_primary_accel_cal_sample_avg(uint8_t sample_num, Vector3f& ret) const; // Returns newly calculated trim values if calculated bool get_new_trim(float& trim_roll, float &trim_pitch); // initialise and register accel calibrator // called during the startup of accel cal void acal_init(); // update accel calibrator void acal_update(); bool accel_cal_requires_reboot() const { return _accel_cal_requires_reboot; } private: // load backend drivers bool _add_backend(AP_InertialSensor_Backend *backend); void _start_backends(); AP_InertialSensor_Backend *_find_backend(int16_t backend_id, uint8_t instance); // gyro initialisation void _init_gyro(); // Calibration routines borrowed from Rolfe Schmidt // blog post describing the method: http://chionophilous.wordpress.com/2011/10/24/accelerometer-calibration-iv-1-implementing-gauss-newton-on-an-atmega/ // original sketch available at http://rolfeschmidt.com/mathtools/skimetrics/adxl_gn_calibration.pde bool _calculate_trim(const Vector3f &accel_sample, float& trim_roll, float& trim_pitch); // save gyro calibration values to eeprom void _save_gyro_calibration(); // backend objects AP_InertialSensor_Backend *_backends[INS_MAX_BACKENDS]; // number of gyros and accel drivers. Note that most backends // provide both accel and gyro data, so will increment both // counters on initialisation uint8_t _gyro_count; uint8_t _accel_count; uint8_t _backend_count; // the selected sample rate uint16_t _sample_rate; float _loop_delta_t; // Most recent accelerometer reading Vector3f _accel[INS_MAX_INSTANCES]; Vector3f _delta_velocity[INS_MAX_INSTANCES]; float _delta_velocity_dt[INS_MAX_INSTANCES]; bool _delta_velocity_valid[INS_MAX_INSTANCES]; // delta velocity accumulator Vector3f _delta_velocity_acc[INS_MAX_INSTANCES]; // time accumulator for delta velocity accumulator float _delta_velocity_acc_dt[INS_MAX_INSTANCES]; // Low Pass filters for gyro and accel LowPassFilter2pVector3f _accel_filter[INS_MAX_INSTANCES]; LowPassFilter2pVector3f _gyro_filter[INS_MAX_INSTANCES]; Vector3f _accel_filtered[INS_MAX_INSTANCES]; Vector3f _gyro_filtered[INS_MAX_INSTANCES]; bool _new_accel_data[INS_MAX_INSTANCES]; bool _new_gyro_data[INS_MAX_INSTANCES]; // Most recent gyro reading Vector3f _gyro[INS_MAX_INSTANCES]; Vector3f _delta_angle[INS_MAX_INSTANCES]; float _delta_angle_dt[INS_MAX_INSTANCES]; bool _delta_angle_valid[INS_MAX_INSTANCES]; // time accumulator for delta angle accumulator float _delta_angle_acc_dt[INS_MAX_INSTANCES]; Vector3f _delta_angle_acc[INS_MAX_INSTANCES]; Vector3f _last_delta_angle[INS_MAX_INSTANCES]; Vector3f _last_raw_gyro[INS_MAX_INSTANCES]; // product id AP_Int16 _old_product_id; // IDs to uniquely identify each sensor: shall remain // the same across reboots AP_Int32 _accel_id[INS_MAX_INSTANCES]; AP_Int32 _gyro_id[INS_MAX_INSTANCES]; // accelerometer scaling and offsets AP_Vector3f _accel_scale[INS_MAX_INSTANCES]; AP_Vector3f _accel_offset[INS_MAX_INSTANCES]; AP_Vector3f _gyro_offset[INS_MAX_INSTANCES]; // accelerometer position offset in body frame AP_Vector3f _accel_pos[INS_MAX_INSTANCES]; // accelerometer max absolute offsets to be used for calibration float _accel_max_abs_offsets[INS_MAX_INSTANCES]; // accelerometer and gyro raw sample rate in units of Hz uint16_t _accel_raw_sample_rates[INS_MAX_INSTANCES]; uint16_t _gyro_raw_sample_rates[INS_MAX_INSTANCES]; // temperatures for an instance if available float _temperature[INS_MAX_INSTANCES]; // filtering frequency (0 means default) AP_Int8 _accel_filter_cutoff; AP_Int8 _gyro_filter_cutoff; AP_Int8 _gyro_cal_timing; // use for attitude, velocity, position estimates AP_Int8 _use[INS_MAX_INSTANCES]; // control enable of fast sampling AP_Int8 _fast_sampling_mask; // board orientation from AHRS enum Rotation _board_orientation; // per-sensor orientation to allow for board type defaults at runtime enum Rotation _gyro_orientation[INS_MAX_INSTANCES]; enum Rotation _accel_orientation[INS_MAX_INSTANCES]; // calibrated_ok/id_ok flags bool _gyro_cal_ok[INS_MAX_INSTANCES]; bool _accel_id_ok[INS_MAX_INSTANCES]; // primary accel and gyro uint8_t _primary_gyro; uint8_t _primary_accel; // has wait_for_sample() found a sample? bool _have_sample:1; // are we in HIL mode? bool _hil_mode:1; // are gyros or accels currently being calibrated bool _calibrating:1; // should we log raw accel/gyro data? bool _log_raw_data:1; bool _backends_detected:1; // the delta time in seconds for the last sample float _delta_time; // last time a wait_for_sample() returned a sample uint32_t _last_sample_usec; // target time for next wait_for_sample() return uint32_t _next_sample_usec; // time between samples in microseconds uint32_t _sample_period_usec; // health of gyros and accels bool _gyro_healthy[INS_MAX_INSTANCES]; bool _accel_healthy[INS_MAX_INSTANCES]; uint32_t _accel_error_count[INS_MAX_INSTANCES]; uint32_t _gyro_error_count[INS_MAX_INSTANCES]; // vibration and clipping uint32_t _accel_clip_count[INS_MAX_INSTANCES]; LowPassFilterVector3f _accel_vibe_floor_filter[INS_VIBRATION_CHECK_INSTANCES]; LowPassFilterVector3f _accel_vibe_filter[INS_VIBRATION_CHECK_INSTANCES]; // peak hold detector state for primary accel struct PeakHoldState { float accel_peak_hold_neg_x; uint32_t accel_peak_hold_neg_x_age; } _peak_hold_state; // threshold for detecting stillness AP_Float _still_threshold; /* state for HIL support */ struct { float delta_time; } _hil {}; // Trim options AP_Int8 _acc_body_aligned; AP_Int8 _trim_option; DataFlash_Class *_dataflash; static AP_InertialSensor *_s_instance; AP_AccelCal* _acal; AccelCalibrator *_accel_calibrator; //save accelerometer bias and scale factors void _acal_save_calibrations(); void _acal_event_failure(); // Returns AccelCalibrator objects pointer for specified acceleromter AccelCalibrator* _acal_get_calibrator(uint8_t i) { return i