File content as of revision 3:907803d8be4d:

/*
FreeIMU.h - A libre and easy to use orientation sensing library for Arduino
Copyright (C) 2011 Fabio Varesano <fabio at varesano dot net>

Development of this code has been supported by the Department of Computer Science,
Universita' degli Studi di Torino, Italy within the Piemonte Project
http://www.piemonte.di.unito.it/


This program is free software: you can redistribute it and/or modify
it under the terms of the version 3 GNU General Public License as
published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef FreeIMU_h
#define FreeIMU_h

// Uncomment the appropriated version of FreeIMU you are using
//#define FREEIMU_v01
//#define FREEIMU_v02
//#define FREEIMU_v03
//#define FREEIMU_v035
//#define FREEIMU_v035_MS
//#define FREEIMU_v035_BMP
#define FREEIMU_v04

// 3rd party boards. Please consider donating or buying a FreeIMU board to support this library development.
//#define SEN_10121 //IMU Digital Combo Board - 6 Degrees of Freedom ITG3200/ADXL345 SEN-10121 http://www.sparkfun.com/products/10121
//#define SEN_10736 //9 Degrees of Freedom - Razor IMU SEN-10736 http://www.sparkfun.com/products/10736
//#define SEN_10724 //9 Degrees of Freedom - Sensor Stick SEN-10724 http://www.sparkfun.com/products/10724
//#define SEN_10183 //9 Degrees of Freedom - Sensor Stick  SEN-10183 http://www.sparkfun.com/products/10183
//#define ARDUIMU_v3 //  DIYDrones ArduIMU+ V3 http://store.diydrones.com/ArduIMU_V3_p/kt-arduimu-30.htm or https://www.sparkfun.com/products/11055
#define GEN_MPU6050 // Generic MPU6050 breakout board. Compatible with GY-521, SEN-11028 and other MPU6050 wich have the MPU6050 AD0 pin connected to GND.

// *** No configuration needed below this line ***


#define FREEIMU_LIB_VERSION "20121122"

#define FREEIMU_DEVELOPER "Fabio Varesano - varesano.net"

#if F_CPU == 16000000L
  #define FREEIMU_FREQ "16 MHz"
#elif F_CPU == 8000000L
  #define FREEIMU_FREQ "8 MHz"
#endif


// board IDs

#if defined(FREEIMU_v04)
  #define FREEIMU_ID "FreeIMU v0.4"
#endif


#define HAS_MPU6050() (defined(FREEIMU_v04) || defined(GEN_MPU6050))

#define IS_6DOM() (defined(SEN_10121) || defined(GEN_MPU6050))
#define HAS_AXIS_ALIGNED() (defined(FREEIMU_v01) || defined(FREEIMU_v02) || defined(FREEIMU_v03) || defined(FREEIMU_v035) || defined(FREEIMU_v035_MS) || defined(FREEIMU_v035_BMP) || defined(FREEIMU_v04) || defined(SEN_10121) || defined(SEN_10736))



//#include <Wire.h>

#include "mbed.h"
#include "calibration.h"
/*
#ifndef CALIBRATION_H
#include <EEPROM.h>
#endif

#define FREEIMU_EEPROM_BASE 0x0A
#define FREEIMU_EEPROM_SIGNATURE 0x19
*/
//#if FREEIMU_VER <= 3

#if HAS_MPU6050()
 // #include <Wire.h>
  #include "I2Cdev.h"
  #include "MPU6050.h"
  #define FIMU_ACCGYRO_ADDR MPU6050_DEFAULT_ADDRESS

#endif



#define FIMU_BMA180_DEF_ADDR BMA180_ADDRESS_SDO_LOW
#define FIMU_ITG3200_DEF_ADDR ITG3200_ADDR_AD0_LOW // AD0 connected to GND
// HMC5843 address is fixed so don't bother to define it


#define twoKpDef  (2.0f * 0.5f) // 2 * proportional gain
#define twoKiDef  (2.0f * 0.1f) // 2 * integral gain

#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif

class FreeIMU
{
  public:
    FreeIMU();
    void init();
    void init(bool fastmode);
    
    void init(int accgyro_addr, bool fastmode);
    
    #ifndef CALIBRATION_H
    void calLoad();
    #endif
    void zeroGyro();
    void getRawValues(int16_t * raw_values);
    void getValues(float * values);
    void getQ(float * q);
    void getEuler(float * angles);
    void getYawPitchRoll(float * ypr);
    void getEulerRad(float * angles);
    void getYawPitchRollRad(float * ypr);
    void gravityCompensateAcc(float * acc, float * q);
    
    // we make them public so that users can interact directly with device classes

      MPU6050 accgyro;    
    
    int* raw_acc, raw_gyro, raw_magn;
    // calibration parameters
    int16_t gyro_off_x, gyro_off_y, gyro_off_z;
    int16_t acc_off_x, acc_off_y, acc_off_z, magn_off_x, magn_off_y, magn_off_z;
    float acc_scale_x, acc_scale_y, acc_scale_z, magn_scale_x, magn_scale_y, magn_scale_z;
    
  private:

    void AHRSupdate(float gx, float gy, float gz, float ax, float ay, float az);

    //float q0, q1, q2, q3; // quaternion elements representing the estimated orientation
    float iq0, iq1, iq2, iq3;
    float exInt, eyInt, ezInt;  // scaled integral error
    volatile float twoKp;      // 2 * proportional gain (Kp)
    volatile float twoKi;      // 2 * integral gain (Ki)
    volatile float q0, q1, q2, q3; // quaternion of sensor frame relative to auxiliary frame
    volatile float integralFBx,  integralFBy, integralFBz;
    Timer update;
    int dt_us;
    //unsigned long lastUpdate, now; // sample period expressed in milliseconds
    float sampleFreq; // half the sample period expressed in seconds
    
};

float invSqrt(float number);
void arr3_rad_to_deg(float * arr);



#endif // FreeIMU_h