/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-

#ifndef __AP_INERTIAL_SENSOR_MPU6000_H__
#define __AP_INERTIAL_SENSOR_MPU6000_H__

#include <string.h>
#include <stdint.h>

#include "../AP_PeriodicProcess/AP_PeriodicProcess.h"
#include "../AP_Math/AP_Math.h"
#include "AP_InertialSensor.h"

class AP_InertialSensor_MPU6000 : public AP_InertialSensor
{
  public:

  AP_InertialSensor_MPU6000( uint8_t cs_pin );

  uint16_t init( AP_PeriodicProcess * scheduler );

  /* Concrete implementation of AP_InertialSensor functions: */
  bool update();
  bool new_data_available();
  float gx();
  float gy();
  float gz();
  void get_gyros( float * );
  float ax();
  float ay();
  float az();
  void get_accels( float * );
  void get_sensors( float * );
  float temperature();
  uint32_t sample_time();
  void reset_sample_time();
  float get_gyro_drift_rate();

  private:

  static void read(uint32_t);
  static void data_interrupt(void);
  static uint8_t register_read( uint8_t reg );
  static void register_write( uint8_t reg, uint8_t val );
  static void hardware_init();

  Vector3f _gyro;
  Vector3f _accel;
  float _temp;

  uint32_t _last_sample_micros;

  float _temp_to_celsius( uint16_t );

  static const float _accel_scale;
  static const float _gyro_scale;

  static const uint8_t _gyro_data_index[3];
  static const  int8_t _gyro_data_sign[3];

  static const uint8_t _accel_data_index[3];
  static const  int8_t _accel_data_sign[3];

  static const uint8_t _temp_data_index;

  /* TODO deprecate _cs_pin */
  static uint8_t _cs_pin;

  // ensure we can't initialise twice
  unsigned _initialised:1;
};

#endif // __AP_INERTIAL_SENSOR_MPU6000_H__