PX4-Autopilot/src/modules/commander/calibration_routines.h

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/// @file calibration_routines.h
///	@author Don Gagne <don@thegagnes.com>

#pragma once

#include <drivers/drv_hrt.h>

/**
 * Least-squares fit of a sphere to a set of points.
 *
 * Fits a sphere to a set of points on the sphere surface.
 *
 * @param x point coordinates on the X axis
 * @param y point coordinates on the Y axis
 * @param z point coordinates on the Z axis
 * @param size number of points
 * @param max_iterations abort if maximum number of iterations have been reached. If unsure, set to 100.
 * @param sphere_x coordinate of the sphere center on the X axis
 * @param sphere_y coordinate of the sphere center on the Y axis
 * @param sphere_z coordinate of the sphere center on the Z axis
 * @param sphere_radius sphere radius
 *
 * @return 0 on success, 1 on failure
 */
int run_lm_sphere_fit(const float x[], const float y[], const float z[],
		      float &fitness, float &sphere_lambda, unsigned int size,
		      float *offset_x, float *offset_y, float *offset_z,
		      float *sphere_radius,
		      float *diag_x, float *diag_y, float *diag_z,
		      float *offdiag_x, float *offdiag_y, float *offdiag_z);

int run_lm_ellipsoid_fit(const float x[], const float y[], const float z[],
			 float &fitness, float &sphere_lambda, unsigned int size,
			 float *offset_x, float *offset_y, float *offset_z,
			 float *sphere_radius,
			 float *diag_x, float *diag_y, float *diag_z,
			 float *offdiag_x, float *offdiag_y, float *offdiag_z);

// The order of these cannot change since the calibration calculations depend on them in this order
enum detect_orientation_return {
	ORIENTATION_TAIL_DOWN,
	ORIENTATION_NOSE_DOWN,
	ORIENTATION_LEFT,
	ORIENTATION_RIGHT,
	ORIENTATION_UPSIDE_DOWN,
	ORIENTATION_RIGHTSIDE_UP,
	ORIENTATION_ERROR
};
static constexpr unsigned detect_orientation_side_count = 6;

/// Wait for vehicle to become still and detect it's orientation
///	@return Returns detect_orientation_return according to orientation when vehicle
///		and ready for measurements
enum detect_orientation_return detect_orientation(orb_advert_t *mavlink_log_pub,	///< uORB handle to write output to
		bool lenient_still_detection);	///< true: Use more lenient still position detection

/// Returns the human readable string representation of the orientation
///	@param orientation Orientation to return string for, "error" if buffer is too small
const char *detect_orientation_str(enum detect_orientation_return orientation);

enum calibrate_return {
	calibrate_return_ok,
	calibrate_return_error,
	calibrate_return_cancelled
};

typedef calibrate_return(*calibration_from_orientation_worker_t)(detect_orientation_return
		orientation,	///< Orientation which was detected
		void *worker_data);	///< Opaque worker data

/// Perform calibration sequence which require a rest orientation detection prior to calibration.
///	@return OK: Calibration succeeded, ERROR: Calibration failed
calibrate_return calibrate_from_orientation(orb_advert_t *mavlink_log_pub,	///< uORB handle to write output to
		bool side_data_collected[detect_orientation_side_count],	///< Sides for which data still needs calibration
		calibration_from_orientation_worker_t calibration_worker,	///< Worker routine which performs the actual calibration
		void *worker_data,						///< Opaque data passed to worker routine
		bool lenient_still_detection);					///< true: Use more lenient still position detection

/// Used to periodically check for a cancel command
bool calibrate_cancel_check(orb_advert_t *mavlink_log_pub, const hrt_abstime &calibration_started);


// TODO FIXME: below are workarounds for QGC. The issue is that sometimes
// a mavlink log message is overwritten by the following one. A workaround
// is to wait for some time after publishing each message and hope that it
// gets sent out in the meantime.

#define calibration_log_info(_pub, _text, ...)			\
	do { \
		mavlink_log_info(_pub, _text, ##__VA_ARGS__); \
		px4_usleep(10000); \
	} while(0);

#define calibration_log_critical(_pub, _text, ...)			\
	do { \
		mavlink_log_critical(_pub, _text, ##__VA_ARGS__); \
		px4_usleep(10000); \
	} while(0);

#define calibration_log_emergency(_pub, _text, ...)			\
	do { \
		mavlink_log_emergency(_pub, _text, ##__VA_ARGS__); \
		px4_usleep(10000); \
	} while(0);