view Small_CPU/Src/compass.c @ 186:f11f0bf6ef2d cleanup-2

cleanup: remove obsolete code, make static, etc. Some rather trivial cleanup things like putting demo code into ifdefs, making functions static where possible, and against my normal policy of hard removing unused code, commenting it out at this point in time. Somehow, I think that this commented code might be useful in the near future as a new pressure sensor is coming. And finally, fixed some typo's in comment. Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
author Jan Mulder <jlmulder@xs4all.nl>
date Fri, 15 Mar 2019 12:39:28 +0100
parents 9baecc0c24b2
children a61b46a5265b
line wrap: on
line source

/**
  ******************************************************************************
  * @file    compass.c 
  * @author  heinrichs weikamp gmbh
  * @date    27-March-2014
  * @version V0.2.0
  * @since   21-April-2016
  * @brief   for Honeywell Compass and ST LSM303D
  *           
  @verbatim                 
  ============================================================================== 
                        ##### How to use #####
  ============================================================================== 
	V0.1.0		09-March-2016
	V0.2.0		21-April-2016	Orientation fixed for LSM303D,
													roll and pitch added to calibration output,
													orientation double checked with datasheets and layout
													as well as with value output during calibration
	V0.2.1		19-May-2016		New date rate config and full-scale selection
	
	@endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 heinrichs weikamp</center></h2>
  *
  ******************************************************************************
  */ 

#include <math.h>
#include <string.h>

#include "compass.h"
#include "compass_LSM303D.h"
#include "compass_LSM303DLHC.h"

#include "i2c.h"
#include "RTE_FlashAccess.h" // to store compass_calib_data

#include "stm32f4xx_hal.h"

#define	TEST_IF_HMC5883L
//#define COMPASS_DEACTIVATE

/// split byte to bits
typedef struct{ 
uint8_t bit0:1; ///< split byte to bits
uint8_t bit1:1; ///< split byte to bits
uint8_t bit2:1; ///< split byte to bits
uint8_t bit3:1; ///< split byte to bits
uint8_t bit4:1; ///< split byte to bits
uint8_t bit5:1; ///< split byte to bits
uint8_t bit6:1; ///< split byte to bits
uint8_t bit7:1; ///< split byte to bits
} ubit8_t;


/// split byte to bits
typedef union{ 
ubit8_t ub; ///< split byte to bits
uint8_t uw; ///< split byte to bits
} bit8_Type;
	

/// split word to 2 bytes
typedef struct{
uint8_t low; ///< split word to 2 bytes
uint8_t hi; ///< split word to 2 bytes
} two_byte; 
	

/// split word to 2 bytes
typedef union{
two_byte Byte; ///< split word to 2 bytes
uint16_t Word; ///< split word to 2 bytes
} tword; 


/// split signed word to 2 bytes
typedef union{
two_byte Byte; ///< split signed word to 2 bytes
int16_t Word; ///< split signed word to 2 bytes
} signed_tword; 


/// split full32 to 2 words
typedef struct{
uint16_t low16; ///< split word to 2 bytes
uint16_t hi16; ///< split word to 2 bytes
} two_word; 

typedef union{
two_word Word16; ///< split word to 2 bytes
uint32_t Full32; ///< split word to 2 bytes
} tfull32; 


/// crazy compass calibration stuff
typedef struct
{
unsigned short int compass_N;							
float Su, Sv, Sw;													
float Suu, Svv, Sww, Suv, Suw, Svw;				
float Suuu, Svvv, Swww;										
float Suuv, Suuw, Svvu, Svvw, Swwu, Swwv;	
} SCompassCalib; 


#define Q_PI    (18000)
#define Q_PIO2  (9000)

#define HMC5883L (1)	///< id used with hardwareCompass 
#define LSM303D  (2)	///< id used with hardwareCompass
#define COMPASS_NOT_RECOGNIZED  (4)	///< id used with hardwareCompass


//////////////////////////////////////////////////////////////////////////////
// fifth order of polynomial approximation of atan(), giving 0.05 deg max error
//
#define K1  (5701)  // Needs K1/2**16
#define K2  (1645)  // Needs K2/2**48  WAS NEGATIV
#define K3  ( 446)  // Needs K3/2**80

const float PI = 3.14159265;	///< pi, used in compass_calc()

typedef short int Int16;
typedef signed char Int8;
typedef Int16 Angle;


/// The (filtered) components of the magnetometer sensor
int16_t compass_DX_f; ///< output from sensor
int16_t compass_DY_f; ///< output from sensor
int16_t compass_DZ_f; ///< output from sensor


/// Found soft-iron calibration values, deduced from already filtered values
int16_t compass_CX_f; ///< calibration value
int16_t compass_CY_f; ///< calibration value
int16_t compass_CZ_f; ///< calibration value


/// The (filtered) components of the accelerometer sensor
int16_t accel_DX_f; ///< output from sensor
int16_t accel_DY_f; ///< output from sensor
int16_t accel_DZ_f; ///< output from sensor


/// The compass result values
float compass_heading;	///< the final result calculated in compass_calc()
float compass_roll;			///< the final result calculated in compass_calc()
float compass_pitch;		///< the final result calculated in compass_calc()


uint8_t compass_gain; ///< 7 on start, can be reduced during calibration

uint8_t  hardwareCompass = 0;	///< either  HMC5883L or LSM303D or not defined yet ( = 0 )

/// LSM303D variables
uint8_t magDataBuffer[6];	///< here raw data from LSM303D is stored, can be local
uint8_t accDataBuffer[6];	///< here raw data from LSM303D is stored, can be local

//uint16_t velMag = 0;
//uint16_t velAcc = 0;

//uint16_t magODR[] = {31,62,125,250,500,1000,2000};
//uint16_t accODR[] = {0,31,62,125,250,500,1000,2000,4000,8000,16000};
//uint8_t fastest = 10; //no sensor is the fastest
//uint8_t datas1 = 0;
//uint8_t zoffFlag = 0;
//uint8_t sendFlag = 0;


// all by pixhawk code:

//	struct accel_scale	_accel_scale;
unsigned		_accel_range_m_s2;
float			_accel_range_scale;
unsigned		_accel_samplerate;
unsigned		_accel_onchip_filter_bandwith;

//	struct mag_scale	_mag_scale;
unsigned		_mag_range_ga;
float			_mag_range_scale;
unsigned		_mag_samplerate;

// default scale factors
float _accel_scale_x_offset = 0.0f;
float _accel_scale_x_scale  = 1.0f;
float _accel_scale_y_offset = 0.0f;
float _accel_scale_y_scale  = 1.0f;
float _accel_scale_z_offset = 0.0f;
float _accel_scale_z_scale  = 1.0f;

float _mag_scale_x_offset = 0.0f;
float _mag_scale_x_scale = 1.0f;
float _mag_scale_y_offset = 0.0f;
float _mag_scale_y_scale = 1.0f;
float _mag_scale_z_offset = 0.0f;
float _mag_scale_z_scale = 1.0f;


/* External function prototypes ----------------------------------------------*/

extern void copyCompassDataDuringCalibration(int16_t dx, int16_t dy, int16_t dz);

/* Private function prototypes -----------------------------------------------*/

void compass_reset_calibration(SCompassCalib *g);
void compass_add_calibration(SCompassCalib *g);
void compass_solve_calibration(SCompassCalib *g);

void compass_init_HMC5883L(uint8_t fast, uint8_t gain);
void compass_sleep_HMC5883L(void);
void compass_read_HMC5883L(void);

void accelerator_init_MMA8452Q(void);
void accelerator_sleep_MMA8452Q(void);
void acceleration_read_MMA8452Q(void);

void compass_init_LSM303D(uint8_t fast, uint8_t gain);
void compass_sleep_LSM303D(void);
void compass_read_LSM303D(void);
void acceleration_read_LSM303D(void);

int LSM303D_accel_set_onchip_lowpass_filter_bandwidth(unsigned bandwidth);
int compass_calib_common(void);

void compass_calc_roll_pitch_only(void);

void rotate_mag_3f(float *x, float *y, float *z);
void rotate_accel_3f(float *x, float *y, float *z);


/* Exported functions --------------------------------------------------------*/


//  ===============================================================================
//	compass_init
/// @brief	This might be called several times with different gain values during calibration
/// 				On first call it figures out which hardware is integrated
///
/// @param 	gain: 7 is max gain, compass_calib() might reduce it
//  ===============================================================================

uint8_t testCompassTypeDebug = 0xFF;

void compass_init(uint8_t fast, uint8_t gain)
{
// quick off
#ifdef COMPASS_DEACTIVATE
	hardwareCompass = COMPASS_NOT_RECOGNIZED;
#endif

// don't call again with fast, gain in calib mode etc.
// if unknown
	if(hardwareCompass == COMPASS_NOT_RECOGNIZED)
	{
		return;
	}
	
// old code but without else
	if(hardwareCompass == 0)
	{
		uint8_t data = WHO_AM_I;
		I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
		I2C_Master_Receive(  DEVICE_COMPASS_303D, &data, 1);
		if(data == WHOIAM_VALUE)
			hardwareCompass = LSM303D;
		else
			hardwareCompass = HMC5883L;
	}

/* No compass identified => Retry */
	if(hardwareCompass == 0)
	{
		uint8_t data = WHO_AM_I;
		I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
		I2C_Master_Receive(  DEVICE_COMPASS_303D, &data, 1);
		if(data == WHOIAM_VALUE)
			hardwareCompass = LSM303D;
		else
			hardwareCompass = HMC5883L;
	}

/* Assume that a HMC5883L is equipped by default if detection still failed */
	if(hardwareCompass == 0)
		hardwareCompass = HMC5883L;	
	
#ifdef TEST_IF_HMC5883L
	HAL_StatusTypeDef resultOfOperationHMC_MMA = HAL_TIMEOUT;

	if(hardwareCompass == HMC5883L)
	{
		uint8_t data = 0x2A; // CTRL_REG1 of DEVICE_ACCELARATOR_MMA8452Q
		resultOfOperationHMC_MMA = I2C_Master_Transmit( DEVICE_ACCELARATOR_MMA8452Q, &data, 1);
		if(resultOfOperationHMC_MMA == HAL_OK)
		{
			hardwareCompass = HMC5883L; // all fine, keep it
		}
		else
		{
			hardwareCompass = COMPASS_NOT_RECOGNIZED;
			testCompassTypeDebug = 0xEC;
		}
	}
#endif
	
	if(hardwareCompass == LSM303D)
	{
		compass_init_LSM303D(fast, gain);
	}
	else
	if(hardwareCompass == HMC5883L)
	{
		compass_init_HMC5883L(fast, gain);
	}
	
		tfull32 dataBlock[4];
		if(BFA_readLastDataBlock((uint32_t *)dataBlock) == BFA_OK)
		{
			compass_CX_f = dataBlock[0].Word16.low16;
			compass_CY_f = dataBlock[0].Word16.hi16;
			compass_CZ_f = dataBlock[1].Word16.low16;
		}

}


//  ===============================================================================
//	compass_calib
/// @brief with onchip_lowpass_filter configuration for accelerometer of LSM303D
//  ===============================================================================
int compass_calib(void)
{
	if(hardwareCompass == LSM303D)
	{
		LSM303D_accel_set_onchip_lowpass_filter_bandwidth(773);
		int out = compass_calib_common();
		LSM303D_accel_set_onchip_lowpass_filter_bandwidth(LSM303D_ACCEL_DEFAULT_ONCHIP_FILTER_FREQ);
		return out;
	}
	else
	if(hardwareCompass == HMC5883L)
	{
		return compass_calib_common();
	}
	else
	{
		return 0; // standard answer of compass_calib_common();
	}


}


//  ===============================================================================
//	compass_sleep
/// @brief	low power mode
//  ===============================================================================
void compass_sleep(void)
{
	if(hardwareCompass == LSM303D)
	{
		compass_sleep_LSM303D();
	}
	else
	if(hardwareCompass == HMC5883L)
	{
		compass_sleep_HMC5883L();
	}
}


//  ===============================================================================
//	compass_read
/// @brief	reads magnetometer and accelerometer for LSM303D,
///					otherwise magnetometer only
//  ===============================================================================
void compass_read(void)
{
	if(hardwareCompass == LSM303D)
	{
		compass_read_LSM303D();
	}
	else
	if(hardwareCompass == HMC5883L)
	{
		compass_read_HMC5883L();
	}
}


//  ===============================================================================
//	accelerator_init
/// @brief	empty for for LSM303D
//  ===============================================================================
void accelerator_init(void)
{
	if(hardwareCompass == HMC5883L)
		accelerator_init_MMA8452Q();
}


//  ===============================================================================
//	accelerator_sleep
/// @brief	empty for for LSM303D
//  ===============================================================================
void accelerator_sleep(void)
{
	if(hardwareCompass == HMC5883L)
		accelerator_sleep_MMA8452Q();
}


//  ===============================================================================
//	acceleration_read
/// @brief	empty for for LSM303D
//  ===============================================================================
void  acceleration_read(void)
{
	if(hardwareCompass == LSM303D)
	{
		acceleration_read_LSM303D();
	}
	else
	if(hardwareCompass == HMC5883L)
	{
		acceleration_read_MMA8452Q();
	}
}


/* Private functions ---------------------------------------------------------*/

//  ===============================================================================
//	LSM303D_read_reg
/// @brief	tiny helpers by pixhawk
//  ===============================================================================
uint8_t LSM303D_read_reg(uint8_t addr)
{
  uint8_t data;

	I2C_Master_Transmit( DEVICE_COMPASS_303D, &addr, 1);
	I2C_Master_Receive(  DEVICE_COMPASS_303D, &data, 1);
	return data;
}


//  ===============================================================================
//	LSM303D_write_reg
/// @brief	tiny helpers by pixhawk
//  ===============================================================================
void LSM303D_write_reg(uint8_t addr, uint8_t value)
{
  uint8_t data[2];
	
	/* enable accel*/
	data[0] = addr;
	data[1] = value;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, data, 2);
}


//  ===============================================================================
//	LSM303D_write_checked_reg
/// @brief	tiny helpers by pixhawk. This runs unchecked at the moment.
//  ===============================================================================
void LSM303D_write_checked_reg(uint8_t addr, uint8_t value)
{
	LSM303D_write_reg(addr, value);
}


//  ===============================================================================
//	LSM303D_modify_reg
/// @brief	tiny helpers by pixhawk
//  ===============================================================================
void LSM303D_modify_reg(unsigned reg, uint8_t clearbits, uint8_t setbits)
{
	uint8_t	val;

	val = LSM303D_read_reg(reg);
	val &= ~clearbits;
	val |= setbits;
	LSM303D_write_checked_reg(reg, val);
}

/*
//  ===============================================================================
//	LSM303D_accel_set_range
/// @brief	tiny helpers by pixhawk
//  ===============================================================================
int LSM303D_accel_set_range(unsigned max_g)
{
	uint8_t setbits = 0;
	uint8_t clearbits = REG2_FULL_SCALE_BITS_A;
	float new_scale_g_digit = 0.0f;

	if (max_g == 0) {
		max_g = 16;
	}

	if (max_g <= 2) {
		_accel_range_m_s2 = 2.0f * LSM303D_ONE_G;
		setbits |= REG2_FULL_SCALE_2G_A;
		new_scale_g_digit = 0.061e-3f;

	} else if (max_g <= 4) {
		_accel_range_m_s2 = 4.0f * LSM303D_ONE_G;
		setbits |= REG2_FULL_SCALE_4G_A;
		new_scale_g_digit = 0.122e-3f;

	} else if (max_g <= 6) {
		_accel_range_m_s2 = 6.0f * LSM303D_ONE_G;
		setbits |= REG2_FULL_SCALE_6G_A;
		new_scale_g_digit = 0.183e-3f;

	} else if (max_g <= 8) {
		_accel_range_m_s2 = 8.0f * LSM303D_ONE_G;
		setbits |= REG2_FULL_SCALE_8G_A;
		new_scale_g_digit = 0.244e-3f;

	} else if (max_g <= 16) {
		_accel_range_m_s2 = 16.0f * LSM303D_ONE_G;
		setbits |= REG2_FULL_SCALE_16G_A;
		new_scale_g_digit = 0.732e-3f;

	} else {
		return -1;
	}

	_accel_range_scale = new_scale_g_digit * LSM303D_ONE_G;


	LSM303D_modify_reg(ADDR_CTRL_REG2, clearbits, setbits);

	return 0;
}
*/
/*
//  ===============================================================================
//	LSM303D_mag_set_range
/// @brief	tiny helpers by pixhawk
//  ===============================================================================
int LSM303D_mag_set_range(unsigned max_ga)
{
	uint8_t setbits = 0;
	uint8_t clearbits = REG6_FULL_SCALE_BITS_M;
	float new_scale_ga_digit = 0.0f;

	if (max_ga == 0) {
		max_ga = 12;
	}

	if (max_ga <= 2) {
		_mag_range_ga = 2;
		setbits |= REG6_FULL_SCALE_2GA_M;
		new_scale_ga_digit = 0.080e-3f;

	} else if (max_ga <= 4) {
		_mag_range_ga = 4;
		setbits |= REG6_FULL_SCALE_4GA_M;
		new_scale_ga_digit = 0.160e-3f;

	} else if (max_ga <= 8) {
		_mag_range_ga = 8;
		setbits |= REG6_FULL_SCALE_8GA_M;
		new_scale_ga_digit = 0.320e-3f;

	} else if (max_ga <= 12) {
		_mag_range_ga = 12;
		setbits |= REG6_FULL_SCALE_12GA_M;
		new_scale_ga_digit = 0.479e-3f;

	} else {
		return -1;
	}

	_mag_range_scale = new_scale_ga_digit;

	LSM303D_modify_reg(ADDR_CTRL_REG6, clearbits, setbits);

	return 0;
}
*/

//  ===============================================================================
//	LSM303D_accel_set_onchip_lowpass_filter_bandwidth
/// @brief	tiny helpers by pixhawk
//  ===============================================================================
int LSM303D_accel_set_onchip_lowpass_filter_bandwidth(unsigned bandwidth)
{
	uint8_t setbits = 0;
	uint8_t clearbits = REG2_ANTIALIAS_FILTER_BW_BITS_A;

	if (bandwidth == 0) {
		bandwidth = 773;
	}

	if (bandwidth <= 50) {
		setbits |= REG2_AA_FILTER_BW_50HZ_A;
		_accel_onchip_filter_bandwith = 50;

	} else if (bandwidth <= 194) {
		setbits |= REG2_AA_FILTER_BW_194HZ_A;
		_accel_onchip_filter_bandwith = 194;

	} else if (bandwidth <= 362) {
		setbits |= REG2_AA_FILTER_BW_362HZ_A;
		_accel_onchip_filter_bandwith = 362;

	} else if (bandwidth <= 773) {
		setbits |= REG2_AA_FILTER_BW_773HZ_A;
		_accel_onchip_filter_bandwith = 773;

	} else {
		return -1;
	}

	LSM303D_modify_reg(ADDR_CTRL_REG2, clearbits, setbits);

	return 0;
}


//  ===============================================================================
//	LSM303D_accel_set_driver_lowpass_filter
/// @brief	tiny helpers by pixhawk. This one is not used at the moment!
//  ===============================================================================
int LSM303D_accel_set_driver_lowpass_filter(float samplerate, float bandwidth)
{
/*
	_accel_filter_x_set_cutoff_frequency(samplerate, bandwidth);
	_accel_filter_y_set_cutoff_frequency(samplerate, bandwidth);
	_accel_filter_z_set_cutoff_frequency(samplerate, bandwidth);
*/	
	return 0;
}

/* unused 170821
//  ===============================================================================
//	LSM303D_accel_set_samplerate
/// @brief	tiny helpers by pixhawk
//  ===============================================================================
int LSM303D_accel_set_samplerate(unsigned frequency)
{
	uint8_t setbits = 0;
	uint8_t clearbits = REG1_RATE_BITS_A;

//	if (frequency == 0 || frequency == ACCEL_SAMPLERATE_DEFAULT) {
		frequency = 1600;
//	}

	if (frequency <= 3) {
		setbits |= REG1_RATE_3_125HZ_A;
		_accel_samplerate = 3;

	} else if (frequency <= 6) {
		setbits |= REG1_RATE_6_25HZ_A;
		_accel_samplerate = 6;

	} else if (frequency <= 12) {
		setbits |= REG1_RATE_12_5HZ_A;
		_accel_samplerate = 12;

	} else if (frequency <= 25) {
		setbits |= REG1_RATE_25HZ_A;
		_accel_samplerate = 25;

	} else if (frequency <= 50) {
		setbits |= REG1_RATE_50HZ_A;
		_accel_samplerate = 50;

	} else if (frequency <= 100) {
		setbits |= REG1_RATE_100HZ_A;
		_accel_samplerate = 100;

	} else if (frequency <= 200) {
		setbits |= REG1_RATE_200HZ_A;
		_accel_samplerate = 200;

	} else if (frequency <= 400) {
		setbits |= REG1_RATE_400HZ_A;
		_accel_samplerate = 400;

	} else if (frequency <= 800) {
		setbits |= REG1_RATE_800HZ_A;
		_accel_samplerate = 800;

	} else if (frequency <= 1600) {
		setbits |= REG1_RATE_1600HZ_A;
		_accel_samplerate = 1600;

	} else {
		return -1;
	}

	LSM303D_modify_reg(ADDR_CTRL_REG1, clearbits, setbits);
	return 0;
}
//  ===============================================================================
//	LSM303D_mag_set_samplerate
/// @brief	tiny helpers by pixhawk
//  ===============================================================================
int LSM303D_mag_set_samplerate(unsigned frequency)
{
	uint8_t setbits = 0;
	uint8_t clearbits = REG5_RATE_BITS_M;

	if (frequency == 0) {
		frequency = 100;
	}

	if (frequency <= 3) {
		setbits |= REG5_RATE_3_125HZ_M;
		_mag_samplerate = 25;

	} else if (frequency <= 6) {
		setbits |= REG5_RATE_6_25HZ_M;
		_mag_samplerate = 25;

	} else if (frequency <= 12) {
		setbits |= REG5_RATE_12_5HZ_M;
		_mag_samplerate = 25;

	} else if (frequency <= 25) {
		setbits |= REG5_RATE_25HZ_M;
		_mag_samplerate = 25;

	} else if (frequency <= 50) {
		setbits |= REG5_RATE_50HZ_M;
		_mag_samplerate = 50;

	} else if (frequency <= 100) {
		setbits |= REG5_RATE_100HZ_M;
		_mag_samplerate = 100;

	} else {
		return -1;
	}

	LSM303D_modify_reg(ADDR_CTRL_REG5, clearbits, setbits);
	return 0;
}
*/


// rotate_mag_3f: nicht genutzt aber praktisch; rotate_accel_3f wird benutzt
//  ===============================================================================
//	rotate_mag_3f
/// @brief	swap axis in convient way, by hw
/// @param 	*x raw input is set to *y input
/// @param 	*y raw input is set to -*x input
/// @param 	*z raw is not touched
//  ===============================================================================
void rotate_mag_3f(float *x, float *y, float *z)
{
	return;
/*	
	*x = *x;		// HMC: *x = -*y
	*y = *y;		// HMC: *y =  *x  // change 20.04.2016: zuvor *y = -*y
	*z = *z;		// HMC: *z =  *z  
*/	
}


//  ===============================================================================
//	rotate_accel_3f
/// @brief	swap axis in convient way, by hw, same as MMA8452Q
/// @param 	*x raw input, output is with sign change
/// @param 	*y raw input, output is with sign change
/// @param 	*z raw input, output is with sign change
//  ===============================================================================
void rotate_accel_3f(float *x, float *y, float *z)
{
	*x = -*x;
	*y = -*y;
	*z = -*z;
	/* tested:
	x = x, y =-y, z=-z: does not work with roll
	x = x, y =y, z=-z: does not work with pitch
	x = x, y =y, z=z: does not work at all
	*/
}


//  ===============================================================================
//	compass_init_LSM303D by PIXhawk (LSM303D::reset())
//  https://raw.githubusercontent.com/PX4/Firmware/master/src/drivers/lsm303d/lsm303d.cpp
/// @brief	The new ST 303D 
///					This might be called several times with different gain values during calibration
///					but gain change is not supported at the moment.
///
/// @param 	gain: 7 is max gain and set with here, compass_calib() might reduce it
//  ===============================================================================

//uint8_t testCompassLS303D[11];

void compass_init_LSM303D(uint8_t fast, uint8_t gain)
{
// matthias version 160620
	if(fast == 0)
	{
		LSM303D_write_checked_reg(ADDR_CTRL_REG0, 0x00);
		LSM303D_write_checked_reg(ADDR_CTRL_REG1, 0x3F); // mod 12,5 Hz 3 instead of 6,25 Hz 2
		LSM303D_write_checked_reg(ADDR_CTRL_REG2, 0xC0);
		LSM303D_write_checked_reg(ADDR_CTRL_REG3, 0x00);
		LSM303D_write_checked_reg(ADDR_CTRL_REG4, 0x00);
		LSM303D_write_checked_reg(ADDR_CTRL_REG5, 0x68); // mod 12,5 Hz 8 instead of 6,25 Hz 4
	}
	else
	{
		LSM303D_write_checked_reg(ADDR_CTRL_REG0, 0x00);
		LSM303D_write_checked_reg(ADDR_CTRL_REG1, 0x6F); // 100 Hz
		LSM303D_write_checked_reg(ADDR_CTRL_REG2, 0xC0);
		LSM303D_write_checked_reg(ADDR_CTRL_REG3, 0x00);
		LSM303D_write_checked_reg(ADDR_CTRL_REG4, 0x00);
		LSM303D_write_checked_reg(ADDR_CTRL_REG5, 0x74); // 100 Hz
	}
	LSM303D_write_checked_reg(ADDR_CTRL_REG6, 0x00);
	LSM303D_write_checked_reg(ADDR_CTRL_REG7, 0x00);

	/*
uint8_t data;
for(int i=0;i<11;i++)
{
	data = ADDR_INT_THS_L_M + i;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
	I2C_Master_Receive(  DEVICE_COMPASS_303D, &testCompassLS303D[i], 1);
}
*/	
	
	return;
/*
	LSM303D_accel_set_range(LSM303D_ACCEL_DEFAULT_RANGE_G); // modifies ADDR_CTRL_REG2
	LSM303D_accel_set_samplerate(LSM303D_ACCEL_DEFAULT_RATE); // modifies ADDR_CTRL_REG1

	LSM303D_mag_set_range(LSM303D_MAG_DEFAULT_RANGE_GA);
	LSM303D_mag_set_samplerate(LSM303D_MAG_DEFAULT_RATE);
*/
	
/*
// my stuff hw
	// enable accel
	LSM303D_write_checked_reg(ADDR_CTRL_REG1,
			  REG1_X_ENABLE_A | REG1_Y_ENABLE_A | REG1_Z_ENABLE_A | REG1_BDU_UPDATE | REG1_RATE_800HZ_A);
	
	// enable mag
	LSM303D_write_checked_reg(ADDR_CTRL_REG7, REG7_CONT_MODE_M);
	LSM303D_write_checked_reg(ADDR_CTRL_REG5, REG5_RES_HIGH_M | REG5_ENABLE_T);
	LSM303D_write_checked_reg(ADDR_CTRL_REG3, 0x04); // DRDY on ACCEL on INT1
	LSM303D_write_checked_reg(ADDR_CTRL_REG4, 0x04); // DRDY on MAG on INT2

	LSM303D_accel_set_range(LSM303D_ACCEL_DEFAULT_RANGE_G);
	LSM303D_accel_set_samplerate(LSM303D_ACCEL_DEFAULT_RATE);
	LSM303D_accel_set_driver_lowpass_filter((float)LSM303D_ACCEL_DEFAULT_RATE, (float)LSM303D_ACCEL_DEFAULT_DRIVER_FILTER_FREQ);
	//LSM303D_accel_set_onchip_lowpass_filter_bandwidth(773); // factory setting	
	
	// we setup the anti-alias on-chip filter as 50Hz. We believe
	// this operates in the analog domain, and is critical for
	// anti-aliasing. The 2 pole software filter is designed to
	// operate in conjunction with this on-chip filter
	if(fast)
		LSM303D_accel_set_onchip_lowpass_filter_bandwidth(773); // factory setting
	else
		LSM303D_accel_set_onchip_lowpass_filter_bandwidth(LSM303D_ACCEL_DEFAULT_ONCHIP_FILTER_FREQ);


	LSM303D_mag_set_range(LSM303D_MAG_DEFAULT_RANGE_GA);
	LSM303D_mag_set_samplerate(LSM303D_MAG_DEFAULT_RATE);
*/
}


//  ===============================================================================
//	compass_sleep_LSM303D
/// @brief	The new compass chip, hopefully this works!
//  ===============================================================================
void compass_sleep_LSM303D(void)
{
	LSM303D_write_checked_reg(ADDR_CTRL_REG1, 0x00); // CNTRL1: acceleration sensor Power-down mode
	LSM303D_write_checked_reg(ADDR_CTRL_REG7, 0x02); // CNTRL7: magnetic sensor Power-down mode
}


//  ===============================================================================
//	acceleration_read_LSM303D
/// @brief	The new LSM303D, code by pixhawk
///
/// output is accel_DX_f, accel_DY_f, accel_DZ_f
//  ===============================================================================
void acceleration_read_LSM303D(void)
{
  uint8_t data;
	float xraw_f, yraw_f, zraw_f;
	float accel_report_x, accel_report_y, accel_report_z;
	
  memset(accDataBuffer,0,6);

	accel_DX_f = 0;
	accel_DY_f = 0;
	accel_DZ_f = 0;
	
	for(int i=0;i<6;i++)
	{
		data = ADDR_OUT_X_L_A + i;
		I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
		I2C_Master_Receive(  DEVICE_COMPASS_303D, &accDataBuffer[i], 1);
	}
	
	xraw_f = ((float)( (int16_t)((accDataBuffer[1] << 8) | (accDataBuffer[0]))));
	yraw_f = ((float)( (int16_t)((accDataBuffer[3] << 8) | (accDataBuffer[2]))));
	zraw_f = ((float)( (int16_t)((accDataBuffer[5] << 8) | (accDataBuffer[4]))));	

	rotate_accel_3f(&xraw_f, &yraw_f, &zraw_f); 
	
	// mh
	accel_report_x = xraw_f;
	accel_report_y = yraw_f;
	accel_report_z = zraw_f;

	// my stuff
/*	
	accel_report_x = ((xraw_f * _accel_range_scale) - _accel_scale_x_offset) * _accel_scale_x_scale;
	accel_report_y = ((yraw_f * _accel_range_scale) - _accel_scale_y_offset) * _accel_scale_y_scale;
	accel_report_z = ((zraw_f * _accel_range_scale) - _accel_scale_z_offset) * _accel_scale_z_scale;
*/	
	accel_DX_f = ((int16_t)(accel_report_x));
	accel_DY_f = ((int16_t)(accel_report_y));
	accel_DZ_f = ((int16_t)(accel_report_z));
}
/* special code after accel_report_z = ...
 * prior to output
//	  we have logs where the accelerometers get stuck at a fixed
//	  large value. We want to detect this and mark the sensor as
//	  being faulty

	if (fabsf(_last_accel[0] - x_in_new) < 0.001f &&
	    fabsf(_last_accel[1] - y_in_new) < 0.001f &&
	    fabsf(_last_accel[2] - z_in_new) < 0.001f &&
	    fabsf(x_in_new) > 20 &&
	    fabsf(y_in_new) > 20 &&
	    fabsf(z_in_new) > 20) {
		_constant_accel_count += 1;

	} else {
		_constant_accel_count = 0;
	}

	if (_constant_accel_count > 100) {
		// we've had 100 constant accel readings with large
		// values. The sensor is almost certainly dead. We
		// will raise the error_count so that the top level
		// flight code will know to avoid this sensor, but
		// we'll still give the data so that it can be logged
		// and viewed
		perf_count(_bad_values);
		_constant_accel_count = 0;
	}

	_last_accel[0] = x_in_new;
	_last_accel[1] = y_in_new;
	_last_accel[2] = z_in_new;

	accel_report.x = _accel_filter_x.apply(x_in_new);
	accel_report.y = _accel_filter_y.apply(y_in_new);
	accel_report.z = _accel_filter_z.apply(z_in_new);

	math::Vector<3> aval(x_in_new, y_in_new, z_in_new);
	math::Vector<3> aval_integrated;

	bool accel_notify = _accel_int.put(accel_report.timestamp, aval, aval_integrated, accel_report.integral_dt);
	accel_report.x_integral = aval_integrated(0);
	accel_report.y_integral = aval_integrated(1);
	accel_report.z_integral = aval_integrated(2);
*/


//  ===============================================================================
//	compass_read_LSM303D
/// @brief	The new LSM303D, code by pixhawk
///
/// output is compass_DX_f, compass_DY_f, compass_DZ_f
//  ===============================================================================
void compass_read_LSM303D(void)
{
  uint8_t data;
//	float xraw_f, yraw_f, zraw_f;
//	float mag_report_x, mag_report_y, mag_report_z;
	
  memset(magDataBuffer,0,6);

	compass_DX_f = 0;
	compass_DY_f = 0;
	compass_DZ_f = 0;
	
	for(int i=0;i<6;i++)
	{
		data = ADDR_OUT_X_L_M + i;
		I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
		I2C_Master_Receive(  DEVICE_COMPASS_303D, &magDataBuffer[i], 1);
	}

	// mh 160620 flip x and y if flip display
	compass_DX_f = (((int16_t)((magDataBuffer[1] << 8) | (magDataBuffer[0]))));
	compass_DY_f = (((int16_t)((magDataBuffer[3] << 8) | (magDataBuffer[2]))));
	compass_DZ_f = (((int16_t)((magDataBuffer[5] << 8) | (magDataBuffer[4]))));
	// no rotation
	return;
/*	
	// my stuff
	compass_DX_f = (((int16_t)((magDataBuffer[1] << 8) | (magDataBuffer[0]))) / 10) - 200;
	compass_DY_f = (((int16_t)((magDataBuffer[3] << 8) | (magDataBuffer[2]))) / 10) - 200;
	compass_DZ_f = (((int16_t)((magDataBuffer[5] << 8) | (magDataBuffer[4]))) / 10) - 200;
*/
	// old
	/*	
	xraw_f = ((float)( (int16_t)((magDataBuffer[1] << 8) | (magDataBuffer[0]))));
	yraw_f = ((float)( (int16_t)((magDataBuffer[3] << 8) | (magDataBuffer[2]))));
	zraw_f = ((float)( (int16_t)((magDataBuffer[5] << 8) | (magDataBuffer[4]))));	

	rotate_mag_3f(&xraw_f, &yraw_f, &zraw_f); 

	compass_DX_f = (int16_t)((xraw_f * 0.1f) - 200.0f);
	compass_DY_f = (int16_t)((yraw_f * 0.1f) - 200.0f);
	compass_DZ_f = (int16_t)((zraw_f * 0.1f) - 200.0f);
*/	
/*	
	mag_report_x = ((xraw_f * _mag_range_scale) - _mag_scale_x_offset) * _mag_scale_x_scale;
	mag_report_y = ((yraw_f * _mag_range_scale) - _mag_scale_y_offset) * _mag_scale_y_scale;
	mag_report_z = ((zraw_f * _mag_range_scale) - _mag_scale_z_offset) * _mag_scale_z_scale;
	
	compass_DX_f = (int16_t)(mag_report_x * 1000.0f); // 1000.0 is just a wild guess by hw
	compass_DY_f = (int16_t)(mag_report_y * 1000.0f);
	compass_DZ_f = (int16_t)(mag_report_z * 1000.0f);
*/	
}


// --------------------------------------------------------------------------------
// ----------EARLIER COMPONENTS ---------------------------------------------------
// --------------------------------------------------------------------------------

//  ===============================================================================
//	compass_init_HMC5883L
/// @brief	The horrible Honeywell compass chip
///					This might be called several times during calibration
///
/// @param 	fast: 1 is fast mode, 0 is normal mode
/// @param 	gain: 7 is max gain and set with here, compass_calib() might reduce it
//  ===============================================================================
void compass_init_HMC5883L(uint8_t fast, uint8_t gain)
{
	uint8_t write_buffer[4];

	compass_gain = gain;
	uint16_t length = 0;
	write_buffer[0] = 0x00; // 00 = config Register A
	
	if( fast )
		write_buffer[1] = 0x38;	// 0b 0011 1000; // ConfigA: 75Hz, 2 Samples averaged
	else
		write_buffer[1] = 0x68; // 0b 0110 1000; // ConfigA:  3Hz, 8 Samples averaged

	switch(gain)
	{
			case 7:
				write_buffer[2] = 0xE0;  //0b 1110 0000; // ConfigB: gain
				break;
			case 6:
				write_buffer[2] = 0xC0;  //0b 1100 0000; // ConfigB: gain
				break;
			case 5:
				write_buffer[2] = 0xA0;  //0b 1010 0000; // ConfigB: gain
				break;
			case 4:
				write_buffer[2] = 0x80;  //0b 1000 0000; // ConfigB: gain
				break;
			case 3:
				write_buffer[2] = 0x60;  //0b 0110 0000; // ConfigB: gain
				break;
			case 2:
				write_buffer[2] = 0x40;  //0b 01000 0000; // ConfigB: gain
				break;
			case 1:
				write_buffer[2] = 0x20;  //0b 00100 0000; // ConfigB: gain
				break;
			case 0:
				write_buffer[2] = 0x00;  //0b 00000 0000; // ConfigB: gain
				break;
	}
	write_buffer[3] = 0x00; // Mode: continuous mode
	length = 4;
	//hmc_twi_write(0);
	I2C_Master_Transmit(  DEVICE_COMPASS_HMC5883L, write_buffer, length);
}



//  ===============================================================================
//	compass_sleep_HMC5883L
/// @brief	Power-down mode for Honeywell compass chip
//  ===============================================================================
void compass_sleep_HMC5883L(void)
{
	uint8_t write_buffer[4];
	uint16_t length = 0;
	
	write_buffer[0] = 0x00; // 00 = config Register A
	write_buffer[1] = 0x68; // 0b 0110 1000; // ConfigA
	write_buffer[2] = 0x20; // 0b 0010 0000; // ConfigB
	write_buffer[3] = 0x02; // 0b 0000 0010; // Idle Mode
	length = 4;
	I2C_Master_Transmit(  DEVICE_COMPASS_HMC5883L, write_buffer, length);
}


//  ===============================================================================
//	accelerator_init_MMA8452Q
/// @brief	Power-down mode for acceleration chip used in combination with Honeywell compass
//  ===============================================================================
void accelerator_init_MMA8452Q(void)
{
	uint8_t write_buffer[4];
	uint16_t length = 0;
	//HAL_Delay(1);
	//return;
	write_buffer[0] = 0x0E; // XYZ_DATA_CFG
	write_buffer[1] = 0x00;//0b00000000; // High pass Filter=0 , +/- 2g range
	length = 2;
	I2C_Master_Transmit(  DEVICE_ACCELARATOR_MMA8452Q, write_buffer, length);
	//HAL_Delay(1);
	write_buffer[0] = 0x2A; // CTRL_REG1
	write_buffer[1] = 0x34; //0b00110100; // CTRL_REG1: 160ms data rate, St.By Mode, reduced noise mode
	write_buffer[2] = 0x02; //0b00000010; // CTRL_REG2: High Res in Active mode
	length = 3;
	I2C_Master_Transmit(  DEVICE_ACCELARATOR_MMA8452Q, write_buffer, length);
	
	//HAL_Delay(1);
	//hw_delay_us(100);
	write_buffer[0] = 0x2A; // CTRL_REG1
	write_buffer[1] = 0x35; //0b00110101; // CTRL_REG1: ... Active Mode
	length = 2;
	I2C_Master_Transmit(  DEVICE_ACCELARATOR_MMA8452Q, write_buffer, length);
/*	
	HAL_Delay(6);
	compass_read();
	HAL_Delay(1);
	acceleration_read();
	
	compass_calc();
*/	
}


//  ===============================================================================
//	accelerator_sleep_MMA8452Q
/// @brief	compass_sleep_HMC5883L
//  ===============================================================================
void accelerator_sleep_MMA8452Q(void)
{
	uint16_t length = 0;
	uint8_t write_buffer[4];
	
	write_buffer[0] = 0x2A; // CTRL_REG1
	write_buffer[1] = 0x00; //0b00000000; // CTRL_REG1: Standby Mode
	length = 2;
	I2C_Master_Transmit(  DEVICE_ACCELARATOR_MMA8452Q, write_buffer, length);
}


//  ===============================================================================
//	compass_read_HMC5883L
/// @brief	The new ST 303D - get ALL data and store in static variables
///
/// output is compass_DX_f, compass_DY_f, compass_DZ_f
//  ===============================================================================
void compass_read_HMC5883L(void)
{
	uint8_t buffer[20];
	compass_DX_f = 0;
	compass_DY_f = 0;
	compass_DZ_f = 0;
	uint8_t length = 0;
	uint8_t read_buffer[6];
	signed_tword 	data;
	for(int i = 0; i<6;i++)
		read_buffer[i] = 0;
	buffer[0] = 0x03; // 03 = Data Output X MSB Register
	length = 1;
	I2C_Master_Transmit(  DEVICE_COMPASS_HMC5883L, buffer, length);
	length = 6;
	I2C_Master_Receive(  DEVICE_COMPASS_HMC5883L, read_buffer, length);
	

	data.Byte.hi = read_buffer[0];
	data.Byte.low = read_buffer[1];
	//Y = Z
	compass_DY_f	= - data.Word;

	data.Byte.hi = read_buffer[2];
	data.Byte.low = read_buffer[3];
	compass_DZ_f = data.Word;

	data.Byte.hi = read_buffer[4];
	data.Byte.low = read_buffer[5]; 
	//X = -Y
	 compass_DX_f 	= data.Word;
}


//  ===============================================================================
//	acceleration_read_MMA8452Q
/// @brief	The old MMA8452Q used with the Honeywell compass
///					get the acceleration data and store in static variables
///
/// output is accel_DX_f, accel_DY_f, accel_DZ_f
//  ===============================================================================
void  acceleration_read_MMA8452Q(void)
{
	uint8_t buffer[20];
	accel_DX_f = 0;
	accel_DY_f = 0;
	accel_DZ_f = 0;
	uint8_t length = 0;
//	bit8_Type status ;
	uint8_t read_buffer[7];
	signed_tword 	data;
	for(int i = 0; i<6;i++)
		read_buffer[i] = 0;
	buffer[0] = 0x00; // 03 = Data Output X MSB Register
	length = 1;
	I2C_Master_Transmit(  DEVICE_ACCELARATOR_MMA8452Q, buffer, length);
	length = 7;
	I2C_Master_Receive(  DEVICE_ACCELARATOR_MMA8452Q, read_buffer, length);
	
//	status.uw = read_buffer[0];
	data.Byte.hi = read_buffer[1];
	data.Byte.low =  read_buffer[2];
	accel_DX_f =data.Word/16;
	data.Byte.hi = read_buffer[3];
	data.Byte.low =  read_buffer[4];
	accel_DY_f =data.Word/16;
	data.Byte.hi = read_buffer[5];
	data.Byte.low =  read_buffer[6];
	accel_DZ_f =data.Word/16;

	accel_DX_f *= -1;
	accel_DY_f *= -1;
	accel_DZ_f *= -1;
}


//  ===============================================================================
//	compass_calc_roll_pitch_only
/// @brief	only the roll and pitch parts of compass_calc()
///
/// input is accel_DX_f, accel_DY_f, accel_DZ_f
/// output is compass_pitch and compass_roll
//  ===============================================================================
void compass_calc_roll_pitch_only(void)
{
	 float sinPhi, cosPhi;
	 float Phi, Teta;

	//---- Calculate sine and cosine of roll angle Phi -----------------------
	Phi= atan2f(accel_DY_f, accel_DZ_f) ;
	compass_roll = Phi * 180.0f /PI;
	sinPhi = sinf(Phi);
	cosPhi = cosf(Phi);

	//---- calculate sin and cosine of pitch angle Theta ---------------------
	Teta = atanf(-(float)accel_DX_f/(accel_DY_f * sinPhi + accel_DZ_f * cosPhi));
	compass_pitch = Teta * 180.0f /PI;
}


//  ===============================================================================
//	compass_calc
/// @brief	all the fancy stuff first implemented in OSTC3
///
/// input is compass_DX_f, compass_DY_f, compass_DZ_f, accel_DX_f, accel_DY_f, accel_DZ_f
/// and compass_CX_f, compass_CY_f, compass_CZ_f
/// output is compass_heading, compass_pitch and compass_roll
//  ===============================================================================
void compass_calc(void)
{
     float	sinPhi, cosPhi, sinTeta, cosTeta;
		 float Phi, Teta, Psi;
     int16_t iBfx, iBfy;
     int16_t iBpx, iBpy, iBpz;
   
    //---- Make hard iron correction -----------------------------------------
    // Measured magnetometer orientation, measured ok.
    // From matthias drawing: (X,Y,Z) --> (X,Y,Z) : no rotation.
    iBpx = compass_DX_f - compass_CX_f; // X
    iBpy = compass_DY_f - compass_CY_f; // Y
    iBpz = compass_DZ_f - compass_CZ_f; // Z

    //---- Calculate sine and cosine of roll angle Phi -----------------------
    //sincos(accel_DZ_f, accel_DY_f, &sin, &cos);
    Phi= atan2f(accel_DY_f, accel_DZ_f) ;
		compass_roll = Phi * 180.0f /PI;
		sinPhi = sinf(Phi);
		cosPhi = cosf(Phi);

		//---- rotate by roll angle (-Phi) ---------------------------------------
    iBfy = iBpy * cosPhi - iBpz * sinPhi;
    iBpz = iBpy * sinPhi + iBpz * cosPhi;
    //Gz = imul(accel_DY_f, sin) + imul(accel_DZ_f, cos);
		
    //---- calculate sin and cosine of pitch angle Theta ---------------------
    //sincos(Gz, -accel_DX_f, &sin, &cos);     // NOTE: changed sin sign.
		// Teta takes into account roll of computer and sends combination of Y and Z :-) understand now hw 160421
		Teta = atanf(-(float)accel_DX_f/(accel_DY_f * sinPhi + accel_DZ_f * cosPhi));
		compass_pitch = Teta * 180.0f /PI;
		sinTeta = sinf(Teta);
		cosTeta = cosf(Teta);
    /* correct cosine if pitch not in range -90 to 90 degrees */
    if( cosTeta < 0 ) cosTeta = -cosTeta;

    ///---- de-rotate by pitch angle Theta -----------------------------------
    iBfx = iBpx *  cosTeta + iBpz * sinTeta;

    //---- Detect uncalibrated compass ---------------------------------------
    if( !compass_CX_f && !compass_CY_f && !compass_CZ_f )
    {
        compass_heading = -1;
        return;
    }

    //---- calculate current yaw = e-compass angle Psi -----------------------
    // Result in degree (no need of 0.01 deg precision...
			Psi = atan2f(-iBfy,iBfx);
		 compass_heading = Psi * 180.0f /PI;
    // Result in 0..360 range:
    if( compass_heading < 0 )
        compass_heading += 360;
}


/*
//  ===============================================================================
//	compass_calc_mini_during_calibration
/// @brief	all the fancy stuff first implemented in OSTC3
///
/// input is accel_DX_f, accel_DY_f, accel_DZ_f
/// output is compass_pitch and compass_roll
//  ===============================================================================
void compass_calc_mini_during_calibration(void)
{
     float	sinPhi, cosPhi;
		 float Phi, Teta;

    //---- Calculate sine and cosine of roll angle Phi -----------------------
    //sincos(accel_DZ_f, accel_DY_f, &sin, &cos);
    Phi= atan2f(accel_DY_f, accel_DZ_f) ;
		compass_roll = Phi * 180.0f /PI;
		sinPhi = sinf(Phi);
		cosPhi = cosf(Phi);
		
    //---- calculate sin and cosine of pitch angle Theta ---------------------
    //sincos(Gz, -accel_DX_f, &sin, &cos);     // NOTE: changed sin sign.
    Teta = atanf(-(float)accel_DX_f/(accel_DY_f * sinPhi + accel_DZ_f * cosPhi));
		compass_pitch = Teta * 180.0f /PI;
}
*/


// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// // - Calibration - ///////////////////////////////////////////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

/* can be lost during sleep as those are reset with compass_reset_calibration() */

//  ===============================================================================
//	compass_reset_calibration
/// @brief	all the fancy stuff first implemented in OSTC3
///
/// output is struct g and compass_CX_f, compass_CY_f, compass_CZ_f
///
/// @param 	g: is a struct with crazy stuff like Suuu, Svvv, Svvu, etc.
///					all is set to zero here
//  ===============================================================================
void compass_reset_calibration(SCompassCalib *g)
{
    g->compass_N = 0;
    g->Su = g->Sv = g->Sw = 0.0;
    g->Suu = g->Svv = g->Sww = g->Suv = g->Suw = g->Svw = 0.0;
    g->Suuu = g->Svvv = g->Swww = 0.0;
    g->Suuv = g->Suuw = g->Svvu = g->Svvw = g->Swwu = g->Swwv = 0.0;
    compass_CX_f = compass_CY_f = compass_CZ_f = 0.0;
}


//  ===============================================================================
//	compass_add_calibration
/// @brief	all the fancy stuff first implemented in OSTC3
///
/// input is compass_DX_f, compass_DY_f, compass_DZ_f
/// and compass_CX_f, compass_CY_f, compass_CZ_f
/// output is struct g
///
/// @param 	g: is a struct with crazy stuff like Suuu, Svvv, Svvu, etc.
//  ===============================================================================
void compass_add_calibration(SCompassCalib *g)
{
    float u, v, w;
   
    u = (compass_DX_f - compass_CX_f) / 32768.0f;
    v = (compass_DY_f - compass_CY_f) / 32768.0f;
    w = (compass_DZ_f - compass_CZ_f) / 32768.0f;

    g->compass_N++;
    g->Su += u;
    g->Sv += v;
    g->Sw += w;
    g->Suv += u*v;
    g->Suw += u*w;
    g->Svw += v*w;
    g->Suu  += u*u;
    g->Suuu += u*u*u;
    g->Suuv += v*u*u;
    g->Suuw += w*u*u;
    g->Svv  += v*v;
    g->Svvv += v*v*v;
    g->Svvu += u*v*v;
    g->Svvw += w*v*v;
    g->Sww  += w*w;
    g->Swww += w*w*w;
    g->Swwu += u*w*w;
    g->Swwv += v*w*w;
}

//////////////////////////////////////////////////////////////////////////////

//  ===============================================================================
//	compass_solve_calibration
/// @brief	all the fancy stuff first implemented in OSTC3
///
/// input is compass_CX_f, compass_CY_f, compass_CZ_f and g
/// output is struct g
///
/// @param 	g: is a struct with crazy stuff like Suuu, Svvv, Svvu, etc.
//  ===============================================================================
void compass_solve_calibration(SCompassCalib *g)
{
    float yu, yv, yw;
    float delta;
    float uc, vc, wc;
    

    //---- Normalize partial sums --------------------------------------------
    //
    // u, v, w should be centered on the mean value um, vm, wm:
    // x = u + um, with um = Sx/N
    //
    // So:
    // (u + um)**2 = u**2 + 2u*um + um**2
    // Su = 0, um = Sx/N
    // Sxx = Suu + 2 um Su + N*(Sx/N)**2 = Suu + Sx**2/N
    // Suu = Sxx - Sx**2/N
    yu = g->Su/g->compass_N;
    yv = g->Sv/g->compass_N;
    yw = g->Sw/g->compass_N;

    g->Suu -= g->Su*yu;
    g->Svv -= g->Sv*yv;
    g->Sww -= g->Sw*yw;

    // (u + um)(v + vm) = uv + u vm + v um + um vm
    // Sxy = Suv + N * um vm
    // Suv = Sxy - N * (Sx/N)(Sy/N);
    g->Suv -= g->Su*yv;
    g->Suw -= g->Su*yw;
    g->Svw -= g->Sv*yw;

    // (u + um)**3 = u**3 + 3 u**2 um + 3 u um**2 + um**3
    // Sxxx = Suuu + 3 um Suu + 3 um**2 Su + N.um**3
    // Su = 0, um = Sx/N:
    // Suuu = Sxxx - 3 Sx*Suu/N - N.(Sx/N)**3
    //      = Sxxx - 3 Sx*Suu/N - Sx**3/N**2

    // (u + um)**2 (v + vm) = (u**2 + 2 u um + um**2)(v + vm)
    // Sxxy = Suuv + vm Suu + 2 um (Suv + vm Su) + um**2 (Sv + N.vm)
    //
    // Su = 0, Sv = 0, vm = Sy/N:
    // Sxxy = Suuv + vm Suu + 2 um Suv + N um**2 vm
    //
    // Suuv = Sxxy - (Sy/N) Suu - 2 (Sx/N) Suv - (Sx/N)**2 Sy
    //      = Sxxy - Suu*Sy/N - 2 Suv*Sx/N - Sx*Sx*Sy/N/N
    //      = Sxxy - (Suu + Sx*Sx/N)*Sy/N - 2 Suv*Sx/N
    g->Suuu -= (3*g->Suu + g->Su*yu)*yu;
    g->Suuv -= (g->Suu + g->Su*yu)*yv + 2*g->Suv*yu;
    g->Suuw -= (g->Suu + g->Su*yu)*yw + 2*g->Suw*yu;

    g->Svvu -= (g->Svv + g->Sv*yv)*yu + 2*g->Suv*yv;
    g->Svvv -= (3*g->Svv + g->Sv*yv)*yv;
    g->Svvw -= (g->Svv + g->Sv*yv)*yw + 2*g->Svw*yv;

    g->Swwu -= (g->Sww + g->Sw*yw)*yu + 2*g->Suw*yw;
    g->Swwv -= (g->Sww + g->Sw*yw)*yv + 2*g->Svw*yw;
    g->Swww -= (3*g->Sww + g->Sw*yw)*yw;

    //---- Solve the system --------------------------------------------------
    // uc Suu + vc Suv + wc Suw = (Suuu + Svvu + Swwu) / 2
    // uc Suv + vc Svv + wc Svw = (Suuv + Svvv + Swwv) / 2
    // uc Suw + vc Svw + wc Sww = (Suuw + Svvw + Swww) / 2
    // Note this is symetric, with a positiv diagonal, hence
    // it always have a uniq solution.
    yu = 0.5f * (g->Suuu + g->Svvu + g->Swwu);
    yv = 0.5f * (g->Suuv + g->Svvv + g->Swwv);
    yw = 0.5f * (g->Suuw + g->Svvw + g->Swww);
    delta = g->Suu * (g->Svv * g->Sww - g->Svw * g->Svw)
          - g->Suv * (g->Suv * g->Sww - g->Svw * g->Suw)
          + g->Suw * (g->Suv * g->Svw - g->Svv * g->Suw);

    uc = (yu  * (g->Svv * g->Sww - g->Svw * g->Svw)
       -  yv  * (g->Suv * g->Sww - g->Svw * g->Suw)
       +  yw  * (g->Suv * g->Svw - g->Svv * g->Suw) )/delta;
    vc = (g->Suu * ( yv * g->Sww -  yw * g->Svw)
       -  g->Suv * ( yu * g->Sww -  yw * g->Suw)
       +  g->Suw * ( yu * g->Svw -  yv * g->Suw) )/delta;
    wc = (g->Suu * (g->Svv * yw  - g->Svw * yv )
       -  g->Suv * (g->Suv * yw  - g->Svw * yu )
       +  g->Suw * (g->Suv * yv  - g->Svv * yu ) )/delta;

    // Back to uncentered coordinates:
    // xc = um + uc
    uc = g->Su/g->compass_N + compass_CX_f/32768.0f + uc;
    vc = g->Sv/g->compass_N + compass_CY_f/32768.0f + vc;
    wc = g->Sw/g->compass_N + compass_CZ_f/32768.0f + wc;

    // Then save the new calibrated center:
    compass_CX_f = (short)(32768 * uc);
    compass_CY_f = (short)(32768 * vc);
    compass_CZ_f = (short)(32768 * wc);
}


//  ===============================================================================
//	compass_calib
/// @brief	the main loop for calibration
/// 				output is compass_CX_f, compass_CY_f, compass_CZ_f and g
///					160704 removed -4096 limit for LSM303D
///
/// @return always 0
//  ===============================================================================
int compass_calib_common(void)
{
		SCompassCalib g;

    // Starts with no calibration at all:
		compass_reset_calibration(&g);
	
		int64_t tickstart = 0;
		uint32_t ticks = 0; 
		uint32_t lasttick = 0;
		tickstart = HAL_GetTick();
    // Eine Minute kalibrieren
    while((ticks) < 60 * 1000)
    {
				compass_read();
				acceleration_read();
				compass_calc_roll_pitch_only();
			
				if((hardwareCompass == HMC5883L)
				&&((compass_DX_f == -4096) ||
					 (compass_DY_f == -4096) ||
					 (compass_DZ_f == -4096) ))
				{
					if(compass_gain == 0)
						return -1;
					compass_gain--;
				
					compass_init(1, compass_gain);
					compass_reset_calibration(&g);
					//tickstart = HAL_GetTick();
					continue;
				}

				copyCompassDataDuringCalibration(compass_DX_f,compass_DY_f,compass_DZ_f);
				compass_add_calibration(&g);
				HAL_Delay(1);
				lasttick = HAL_GetTick();
				if(lasttick == 0)
				{
					 tickstart = -ticks;
				}	
				HAL_Delay(1);
				ticks = lasttick - tickstart;
				SPI_Evaluate_RX_Data();
    }
        
    compass_solve_calibration(&g);
		
		tfull32 dataBlock[4];
		dataBlock[0].Word16.low16 = compass_CX_f;
		dataBlock[0].Word16.hi16 = compass_CY_f;
		dataBlock[1].Word16.low16 = compass_CZ_f;
		dataBlock[1].Word16.hi16 = 0xFFFF;
		dataBlock[2].Full32 = 0x7FFFFFFF;
		dataBlock[3].Full32 = 0x7FFFFFFF;
		BFA_writeDataBlock((uint32_t *)dataBlock);
	
		return 0;
}

// //////////////////////////// TEST CODE /////////////////////////////////////



//#include <QtDebug>
//#include <stdio.h>
//#include <math.h>
/*#include <stdlib.h>

short compass_DX_f, compass_DY_f, compass_DZ_f;
short compass_CX_f, compass_CY_f, compass_CZ_f;

inline float uniform(void) {
    return (rand() & 0xFFFF) / 65536.0f;
}
inline float sqr(float x) {
    return x*x;
}

static const float radius = 0.21f;
static const float cx = 0.79f, cy = -0.46f, cz = 0.24f;
// const float cx = 0, cy = 0, cz = 0;

float check_compass_calib(void)
{

    // Starts with no calibration at all:
    compass_CX_f = compass_CY_f = compass_CZ_f = 0;

    // Try 10 recalibration passes:
    for(int p=0; p<10; ++p)
    {
        compass_reset_calibration();

        //---- Generates random points on a sphere -------------------------------
        // of radius,center (cx, cy, cz):
        for(int i=0; i<100; ++i)
        {
            float theta = uniform()*360.0f;
            float phi   = uniform()*180.0f - 90.0f;

            float x = cx + radius * cosf(phi)*cosf(theta);
            float y = cy + radius * cosf(phi)*sinf(theta);
            float z = cz + radius * sinf(phi);

            compass_DX_f = (short)(32768 * x);
            compass_DY_f = (short)(32768 * y);
            compass_DZ_f = (short)(32768 * z);
            compass_add_calibration();
        }

        compass_solve_calibration();
        //qDebug() << "Center ="
//                 << compass_CX_f/32768.0f
//                 << compass_CY_f/32768.0f
//                 << compass_CZ_f/32768.0f;

        float r2 = sqr(compass_CX_f/32768.0f - cx)
                 + sqr(compass_CY_f/32768.0f - cy)
                 + sqr(compass_CZ_f/32768.0f - cz);
        if( r2 > 0.01f*0.01f )
            return sqrtf(r2);
    }
		return 0;
}*/



/*
void compass_read_LSM303D_v3(void)
{
  uint8_t data;
	
  memset(magDataBuffer,0,6);

	compass_DX_f = 0;
	compass_DY_f = 0;
	compass_DZ_f = 0;
	
	//magnetometer multi read, order xl,xh, yl,yh, zl, zh
	data = REG_MAG_DATA_ADDR;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
	I2C_Master_Receive(  DEVICE_COMPASS_303D, magDataBuffer, 6);

	compass_DX_f = ((int16_t)( (int16_t)((magDataBuffer[1] << 8) | (magDataBuffer[0]))));
	compass_DY_f = ((int16_t)( (int16_t)((magDataBuffer[3] << 8) | (magDataBuffer[2]))));
	compass_DZ_f = ((int16_t)( (int16_t)((magDataBuffer[5] << 8) | (magDataBuffer[4]))));	

//	compass_DX_f = compass_DX_f * stat->sensitivity_mag;
//	compass_DY_f = compass_DY_f * stat->sensitivity_mag;
//	compass_DZ_f = compass_DZ_f * stat->sensitivity_mag;
}


//  ===============================================================================
//	compass_init_LSM303D by STMicroelectronics 2013 V1.0.5 2013/Oct/23
/// @brief	The new ST 303D 
///					This might be called several times with different gain values during calibration
///
/// @param 	gain: 7 is max gain and set with here, compass_calib() might reduce it
//  ===============================================================================

void compass_init_LSM303D_v3(uint8_t gain)
{
  uint8_t data[10];

	// CNTRL1
	// 0011 acceleration data rate 0011 = 12.5 Hz (3.125 Hz - 1600 Hz)
	// 0xxx block data update off
	// x111 enable all three axes 
	
	// CNTRL5
	// 0xxx xxxx temp sensor off
	// x00x xxxx magnetic resolution
	// xxx0 1xxx magentic data rate 01 = 6,25 Hz (3.125 Hz - 50 Hz (100 Hz))
	// xxxx xx00 latch irq requests off
	
	// CNTRL7
	// 00xx high pass filter mode, 00 normal mode
	// xx0x filter for acceleration data bypassed
	// xxx0 temperature sensor mode only off
	// x0xx magnetic data low-power mode off
	// xx00 magnetic sensor mode 00 = continous-conversion mode (default 10 power-down)
	
	data[0] = CNTRL0;
	data[1] = 0x00;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, data, 2);

	// acc
	data[0] = CNTRL1;
	data[1] = 0x00;
	data[2] = 0x0F;
	data[3] = 0x00;
	data[4] = 0x00;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, data, 5);

	// mag
	data[0] = CNTRL3;
	data[1] = 0x00;
	data[2] = 0x00;
	data[3] = 0x18;
	data[4] = 0x20;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, data, 5);
	
	data[0] = CNTRL7;
	data[1] = ((MSMS_MASK & CONTINUOS_CONVERSION) |
			((~MSMS_MASK) & CNTRL7_RESUME_VALUE));
	I2C_Master_Transmit( DEVICE_COMPASS_303D, data, 2);
	
	HAL_Delay(100);
}


//  ===============================================================================
//	compass_init_LSM303D by nordevx for arduion
/// @brief	The new ST 303D 
///					This might be called several times with different gain values during calibration
///
/// @param 	gain: 7 is max gain and set with here, compass_calib() might reduce it
//  ===============================================================================
void compass_init_LSM303D_v2(uint8_t gain)
{
  uint8_t data[2];

	// CNTRL1
	// 0011 acceleration data rate 0011 = 12.5 Hz (3.125 Hz - 1600 Hz)
	// 0xxx block data update off
	// x111 enable all three axes 
	
	// CNTRL5
	// 0xxx xxxx temp sensor off
	// x00x xxxx magnetic resolution
	// xxx0 1xxx magentic data rate 01 = 6,25 Hz (3.125 Hz - 50 Hz (100 Hz))
	// xxxx xx00 latch irq requests off
	
	// CNTRL7
	// 00xx high pass filter mode, 00 normal mode
	// xx0x filter for acceleration data bypassed
	// xxx0 temperature sensor mode only off
	// x0xx magnetic data low-power mode off
	// xx00 magnetic sensor mode 00 = continous-conversion mode (default 10 power-down)
	
	data[0] = CNTRL1;
	data[1] = 0x37; //0b 0011 0111 
	I2C_Master_Transmit( DEVICE_COMPASS_303D, data, 2);
	
	data[0] = CNTRL5;
	data[1] = 0x08; // 0b 0000 1000
	I2C_Master_Transmit( DEVICE_COMPASS_303D, data, 2);
	
	data[0] = CNTRL7;
	data[1] = 0x00; // 0b 0000 0000
	I2C_Master_Transmit( DEVICE_COMPASS_303D, data, 2);
	
	HAL_Delay(100);
}


//  ===============================================================================
//	compass_init_LSM303D_v1 by ST lsm303d.c
/// @brief	The new ST 303D 
///					This might be called several times with different gain values during calibration
///
/// @param 	gain: 7 is max gain and set with here, compass_calib() might reduce it
//  ===============================================================================
void compass_init_LSM303D_v1(uint8_t gain)
{
  uint8_t data;

	compass_gain = gain;

  memset(magDataBuffer,0,6);
  memset(accDataBuffer,0,6);

	data = CNTRL5;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
	I2C_Master_Receive(  DEVICE_COMPASS_303D, &data, 1);
  data = (data & 0x1c) >> 2;  
  velMag = magODR[data];  

	data = CNTRL1;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
	I2C_Master_Receive(  DEVICE_COMPASS_303D, &data, 1);
  data = (data & 0xf0) >> 4;  
  velAcc = accODR[data];
  
	data = CNTRL7;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, &data,   1);
	I2C_Master_Receive(  DEVICE_COMPASS_303D, &datas1, 1);
  datas1 = (datas1 & 0x02);
  
  //if mag is not pd
  //mag is bigger than gyro
  if( (velMag < velAcc) || datas1 != 0 ) {
	//acc is the biggest
	fastest = ACC_IS_FASTEST;	
  }	
  else {		
	//acc is the biggest		
	fastest = MAG_IS_FASTEST;
  }
  
  zoffFlag = 1;
	
  if( fastest == MAG_IS_FASTEST)
	{	
		data = STATUS_REG_M;
		I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
		I2C_Master_Receive(  DEVICE_COMPASS_303D, &data, 1);
 
//    if(ValBit(data, ZYXMDA)) {
      sendFlag = 1;      
//    }
    
  }  
  else if(fastest == ACC_IS_FASTEST)
	{
		data = STATUS_REG_A;
		I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
		I2C_Master_Receive(  DEVICE_COMPASS_303D, &data, 1);
//      if(ValBit(data, DATAREADY_BIT)) {
        sendFlag = 1;
//      }    
  }  
}

//  ===============================================================================
//	compass_read_LSM303D
/// @brief	The new LSM303D :-)
///
/// output is compass_DX_f, compass_DY_f, compass_DZ_f, accel_DX_f, accel_DY_f, accel_DZ_f
//  ===============================================================================
void compass_read_LSM303D_v2(void)
{
	  uint8_t data;
	
  memset(magDataBuffer,0,6);
  memset(accDataBuffer,0,6);

	compass_DX_f = 0;
	compass_DY_f = 0;
	compass_DZ_f = 0;

	accel_DX_f = 0;
	accel_DY_f = 0;
	accel_DZ_f = 0;
	
	//Accelerometer multi read, order xl,xh, yl,yh, zl, zh
	data = REG_ACC_DATA_ADDR;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
	I2C_Master_Receive(  DEVICE_COMPASS_303D, accDataBuffer, 6);
	
	//magnetometer multi read, order xl,xh, yl,yh, zl, zh
	data = OUT_X_L_M;
	I2C_Master_Transmit( DEVICE_COMPASS_303D, &data, 1);
	I2C_Master_Receive(  DEVICE_COMPASS_303D, magDataBuffer, 6);
	
	accel_DX_f = ((int16_t)( (int16_t)((accDataBuffer[1] << 8) | (accDataBuffer[0]))));
	accel_DY_f = ((int16_t)( (int16_t)((accDataBuffer[3] << 8) | (accDataBuffer[2]))));
	accel_DZ_f = ((int16_t)( (int16_t)((accDataBuffer[5] << 8) | (accDataBuffer[4]))));	

//	accel_DX_f = accel_DX_f * stat->sensitivity_acc;
//	accel_DY_f = accel_DY_f * stat->sensitivity_acc;
//	accel_DZ_f = accel_DZ_f * stat->sensitivity_acc;


	compass_DX_f  = magDataBuffer[1];
	compass_DX_f *= 256;
	compass_DX_f += magDataBuffer[0];

	compass_DY_f  = magDataBuffer[3];
	compass_DY_f *= 256;
	compass_DY_f += magDataBuffer[2];

	compass_DY_f  = magDataBuffer[5];
	compass_DY_f *= 256;
	compass_DY_f += magDataBuffer[4];

}


*/