BRIX5

/***************************************************************************

  This is a library for the BNO055 orientation sensor

  Designed specifically to work with the Adafruit BNO055 Breakout.

  Pick one up today in the adafruit shop!

  ------> http://www.adafruit.com/products

  These sensors use I2C to communicate, 2 pins are required to interface.

  Adafruit invests time and resources providing this open source code,

  please support Adafruit andopen-source hardware by purchasing products

  from Adafruit!

  Written by KTOWN for Adafruit Industries.

  MIT license, all text above must be included in any redistribution

 ***************************************************************************/

#if ARDUINO >= 100

 #include "Arduino.h"

#else

 #include "WProgram.h"

#endif

#include <math.h>

#include <limits.h>

#include "Adafruit_BNO055.h"

/***************************************************************************

 CONSTRUCTOR

 ***************************************************************************/

/**************************************************************************/

/*!

    @brief  Instantiates a new Adafruit_BNO055 class

*/

/**************************************************************************/

Adafruit_BNO055::Adafruit_BNO055(int32_t sensorID, uint8_t address)

{

  _sensorID = sensorID;

  _address = address;

}

/***************************************************************************

 PUBLIC FUNCTIONS

 ***************************************************************************/

/**************************************************************************/

/*!

    @brief  Sets up the HW

*/

/**************************************************************************/

bool Adafruit_BNO055::begin(adafruit_bno055_opmode_t mode)

{

  /* Enable I2C */

  Wire.begin();

  // BNO055 clock stretches for 500us or more!

#ifdef ESP8266

  Wire.setClockStretchLimit(1000); // Allow for 1000us of clock stretching

#endif

  /* Make sure we have the right device */

  uint8_t id = read8(BNO055_CHIP_ID_ADDR);

  if(id != BNO055_ID)

  {

    delay(1000); // hold on for boot

    id = read8(BNO055_CHIP_ID_ADDR);

    if(id != BNO055_ID) {

      return false;  // still not? ok bail

    }

  }

  /* Switch to config mode (just in case since this is the default) */

  setMode(OPERATION_MODE_CONFIG);

  /* Reset */

  write8(BNO055_SYS_TRIGGER_ADDR, 0x20);

  while (read8(BNO055_CHIP_ID_ADDR) != BNO055_ID)

  {

    delay(10);

  }

  delay(50);

  /* Set to normal power mode */

  write8(BNO055_PWR_MODE_ADDR, POWER_MODE_NORMAL);

  delay(10);

  write8(BNO055_PAGE_ID_ADDR, 0);

  /* Set the output units */

  /*

  uint8_t unitsel = (0 << 7) | // Orientation = Android

                    (0 << 4) | // Temperature = Celsius

                    (0 << 2) | // Euler = Degrees

                    (1 << 1) | // Gyro = Rads

                    (0 << 0);  // Accelerometer = m/s^2

  write8(BNO055_UNIT_SEL_ADDR, unitsel);

  */

  // Select BNO055 gyro temperature source - REDUCES DRIFT SIGNIFICANTLY!

  write8(BNO055_TEMP_SOURCE_ADDR, 0x01);

  /* Configure axis mapping (see section 3.4) */

  /*

  write8(BNO055_AXIS_MAP_CONFIG_ADDR, REMAP_CONFIG_P2); // P0-P7, Default is P1

  delay(10);

  write8(BNO055_AXIS_MAP_SIGN_ADDR, REMAP_SIGN_P2); // P0-P7, Default is P1

  delay(10);

  */

  write8(BNO055_SYS_TRIGGER_ADDR, 0x0);

  delay(10);

  /* Set the requested operating mode (see section 3.3) */

  setMode(mode);

  delay(20);

  return true;

}

/**************************************************************************/

/*!

    @brief  Puts the chip in the specified operating mode

*/

/**************************************************************************/

void Adafruit_BNO055::setMode(adafruit_bno055_opmode_t mode)

{

  _mode = mode;

  write8(BNO055_OPR_MODE_ADDR, _mode);

  delay(30);

}

/**************************************************************************/

/*!

    @brief  Changes the chip's axis remap

*/

/**************************************************************************/

void Adafruit_BNO055::setAxisRemap( adafruit_bno055_axis_remap_config_t remapcode )

{

  adafruit_bno055_opmode_t modeback = _mode;

  setMode(OPERATION_MODE_CONFIG);

  delay(25);

  write8(BNO055_AXIS_MAP_CONFIG_ADDR, remapcode);

  delay(10);

  /* Set the requested operating mode (see section 3.3) */

  setMode(modeback);

  delay(20);

}

/**************************************************************************/

/*!

    @brief  Changes the chip's axis signs

*/

/**************************************************************************/

void Adafruit_BNO055::setAxisSign( adafruit_bno055_axis_remap_sign_t remapsign )

{

  adafruit_bno055_opmode_t modeback = _mode;

  setMode(OPERATION_MODE_CONFIG);

  delay(25);

  write8(BNO055_AXIS_MAP_SIGN_ADDR, remapsign);

  delay(10);

  /* Set the requested operating mode (see section 3.3) */

  setMode(modeback);

  delay(20);

}

/**************************************************************************/

/*!

    @brief  Use the external 32.768KHz crystal

*/

/**************************************************************************/

void Adafruit_BNO055::setExtCrystalUse(boolean usextal)

{

  adafruit_bno055_opmode_t modeback = _mode;

  /* Switch to config mode (just in case since this is the default) */

  setMode(OPERATION_MODE_CONFIG);

  delay(25);

  write8(BNO055_PAGE_ID_ADDR, 0);

  if (usextal) {

    write8(BNO055_SYS_TRIGGER_ADDR, 0x80);

  } else {

    write8(BNO055_SYS_TRIGGER_ADDR, 0x00);

  }

  delay(10);

  /* Set the requested operating mode (see section 3.3) */

  setMode(modeback);

  delay(20);

}

/**************************************************************************/

/*!

    @brief  Gets the latest system status info

*/

/**************************************************************************/

void Adafruit_BNO055::getSystemStatus(uint8_t *system_status, uint8_t *self_test_result, uint8_t *system_error)

{

  write8(BNO055_PAGE_ID_ADDR, 0);

  /* System Status (see section 4.3.58)

     ---------------------------------

     0 = Idle

     1 = System Error

     2 = Initializing Peripherals

     3 = System Iniitalization

     4 = Executing Self-Test

     5 = Sensor fusio algorithm running

     6 = System running without fusion algorithms */

  if (system_status != 0)

    *system_status    = read8(BNO055_SYS_STAT_ADDR);

  /* Self Test Results (see section )

     --------------------------------

     1 = test passed, 0 = test failed

     Bit 0 = Accelerometer self test

     Bit 1 = Magnetometer self test

     Bit 2 = Gyroscope self test

     Bit 3 = MCU self test

     0x0F = all good! */

  if (self_test_result != 0)

    *self_test_result = read8(BNO055_SELFTEST_RESULT_ADDR);

  /* System Error (see section 4.3.59)

     ---------------------------------

     0 = No error

     1 = Peripheral initialization error

     2 = System initialization error

     3 = Self test result failed

     4 = Register map value out of range

     5 = Register map address out of range

     6 = Register map write error

     7 = BNO low power mode not available for selected operat ion mode

     8 = Accelerometer power mode not available

     9 = Fusion algorithm configuration error

     A = Sensor configuration error */

  if (system_error != 0)

    *system_error     = read8(BNO055_SYS_ERR_ADDR);

  delay(200);

}

/**************************************************************************/

/*!

    @brief  Gets the chip revision numbers

*/

/**************************************************************************/

void Adafruit_BNO055::getRevInfo(adafruit_bno055_rev_info_t* info)

{

  uint8_t a, b;

  memset(info, 0, sizeof(adafruit_bno055_rev_info_t));

  /* Check the accelerometer revision */

  info->accel_rev = read8(BNO055_ACCEL_REV_ID_ADDR);

  /* Check the magnetometer revision */

  info->mag_rev   = read8(BNO055_MAG_REV_ID_ADDR);

  /* Check the gyroscope revision */

  info->gyro_rev  = read8(BNO055_GYRO_REV_ID_ADDR);

  /* Check the SW revision */

  info->bl_rev    = read8(BNO055_BL_REV_ID_ADDR);

  a = read8(BNO055_SW_REV_ID_LSB_ADDR);

  b = read8(BNO055_SW_REV_ID_MSB_ADDR);

  info->sw_rev = (((uint16_t)b) << 8) | ((uint16_t)a);

}

/**************************************************************************/

/*!

    @brief  Gets current calibration state.  Each value should be a uint8_t

            pointer and it will be set to 0 if not calibrated and 3 if

            fully calibrated.

*/

/**************************************************************************/

void Adafruit_BNO055::getCalibration(uint8_t* sys, uint8_t* gyro, uint8_t* accel, uint8_t* mag) {

  uint8_t calData = read8(BNO055_CALIB_STAT_ADDR);

  if (sys != NULL) {

    *sys = (calData >> 6) & 0x03;

  }

  if (gyro != NULL) {

    *gyro = (calData >> 4) & 0x03;

  }

  if (accel != NULL) {

    *accel = (calData >> 2) & 0x03;

  }

  if (mag != NULL) {

    *mag = calData & 0x03;

  }

}

/**************************************************************************/

/*!

    @brief  Gets the temperature in degrees celsius

*/

/**************************************************************************/

int8_t Adafruit_BNO055::getTemp(void)

{

  int8_t temp = (int8_t)(read8(BNO055_TEMP_ADDR));

  return temp;

}

/**************************************************************************/

/*!

    @brief  Gets a vector reading from the specified source

*/

/**************************************************************************/

imu::Vector<3> Adafruit_BNO055::getVector(adafruit_vector_type_t vector_type)

{

  imu::Vector<3> xyz;

  uint8_t buffer[6];

  memset (buffer, 0, 6);

  int16_t x, y, z;

  x = y = z = 0;

  /* Read vector data (6 bytes) */

  readLen((adafruit_bno055_reg_t)vector_type, buffer, 6);

  x = ((int16_t)buffer[0]) | (((int16_t)buffer[1]) << 8);

  y = ((int16_t)buffer[2]) | (((int16_t)buffer[3]) << 8);

  z = ((int16_t)buffer[4]) | (((int16_t)buffer[5]) << 8);

  /* Convert the value to an appropriate range (section 3.6.4) */

  /* and assign the value to the Vector type */

  switch(vector_type)

  {

    case VECTOR_MAGNETOMETER:

      /* 1uT = 16 LSB */

      xyz[0] = ((double)x)/16.0;

      xyz[1] = ((double)y)/16.0;

      xyz[2] = ((double)z)/16.0;

      break;

    case VECTOR_GYROSCOPE:

      /* 1dps = 16 LSB */

      xyz[0] = ((double)x)/16.0;

      xyz[1] = ((double)y)/16.0;

      xyz[2] = ((double)z)/16.0;

      break;

    case VECTOR_EULER:

      /* 1 degree = 16 LSB */

      xyz[0] = ((double)x)/16.0;

      xyz[1] = ((double)y)/16.0;

      xyz[2] = ((double)z)/16.0;

      break;

    case VECTOR_ACCELEROMETER:

    case VECTOR_LINEARACCEL:

    case VECTOR_GRAVITY:

      /* 1m/s^2 = 100 LSB */

      xyz[0] = ((double)x)/100.0;

      xyz[1] = ((double)y)/100.0;

      xyz[2] = ((double)z)/100.0;

      break;

  }

  return xyz;

}

/**************************************************************************/

/*!

    @brief  Gets a quaternion reading from the specified source

*/

/**************************************************************************/

imu::Quaternion Adafruit_BNO055::getQuat(void)

{

  uint8_t buffer[8];

  memset (buffer, 0, 8);

  int16_t x, y, z, w;

  x = y = z = w = 0;

  /* Read quat data (8 bytes) */

  readLen(BNO055_QUATERNION_DATA_W_LSB_ADDR, buffer, 8);

  w = (((uint16_t)buffer[1]) << 8) | ((uint16_t)buffer[0]);

  x = (((uint16_t)buffer[3]) << 8) | ((uint16_t)buffer[2]);

  y = (((uint16_t)buffer[5]) << 8) | ((uint16_t)buffer[4]);

  z = (((uint16_t)buffer[7]) << 8) | ((uint16_t)buffer[6]);

  /* Assign to Quaternion */

  /* See http://ae-bst.resource.bosch.com/media/products/dokumente/bno055/BST_BNO055_DS000_12~1.pdf

     3.6.5.5 Orientation (Quaternion)  */

  const double scale = (1.0 / (1<<14));

  imu::Quaternion quat(scale * w, scale * x, scale * y, scale * z);

  return quat;

}

/**************************************************************************/

/*!

    @brief  Provides the sensor_t data for this sensor

*/

/**************************************************************************/

void Adafruit_BNO055::getSensor(sensor_t *sensor)

{

  /* Clear the sensor_t object */

  memset(sensor, 0, sizeof(sensor_t));

  /* Insert the sensor name in the fixed length char array */

  strncpy (sensor->name, "BNO055", sizeof(sensor->name) - 1);

  sensor->name[sizeof(sensor->name)- 1] = 0;

  sensor->version     = 1;

  sensor->sensor_id   = _sensorID;

  sensor->type        = SENSOR_TYPE_ORIENTATION;

  sensor->min_delay   = 0;

  sensor->max_value   = 0.0F;

  sensor->min_value   = 0.0F;

  sensor->resolution  = 0.01F;

}

/**************************************************************************/

/*!

    @brief  Reads the sensor and returns the data as a sensors_event_t

*/

/**************************************************************************/

bool Adafruit_BNO055::getEvent(sensors_event_t *event)

{

  /* Clear the event */

  memset(event, 0, sizeof(sensors_event_t));

  event->version   = sizeof(sensors_event_t);

  event->sensor_id = _sensorID;

  event->type      = SENSOR_TYPE_ORIENTATION;

  event->timestamp = millis();

  /* Get a Euler angle sample for orientation */

  imu::Vector<3> euler = getVector(Adafruit_BNO055::VECTOR_EULER);

  event->orientation.x = euler.x();

  event->orientation.y = euler.y();

  event->orientation.z = euler.z();

  return true;

}

/**************************************************************************/

/*!

@brief  Reads the sensor's offset registers into a byte array

*/

/**************************************************************************/

bool Adafruit_BNO055::getSensorOffsets(uint8_t* calibData)

{

    if (isFullyCalibrated())

    {

        adafruit_bno055_opmode_t lastMode = _mode;

        setMode(OPERATION_MODE_CONFIG);

        readLen(ACCEL_OFFSET_X_LSB_ADDR, calibData, NUM_BNO055_OFFSET_REGISTERS);

        setMode(lastMode);

        return true;

    }

    return false;

}

/**************************************************************************/

/*!

@brief  Reads the sensor's offset registers into an offset struct

*/

/**************************************************************************/

bool Adafruit_BNO055::getSensorOffsets(adafruit_bno055_offsets_t &offsets_type)

{

    if (isFullyCalibrated())

    {

        adafruit_bno055_opmode_t lastMode = _mode;

        setMode(OPERATION_MODE_CONFIG);

        delay(25);

        /* Accel offset range depends on the G-range:

           +/-2g  = +/- 2000 mg

           +/-4g  = +/- 4000 mg

           +/-8g  = +/- 8000 mg

           +/-1§g = +/- 16000 mg */

        offsets_type.accel_offset_x = (read8(ACCEL_OFFSET_X_MSB_ADDR) << 8) | (read8(ACCEL_OFFSET_X_LSB_ADDR));

        offsets_type.accel_offset_y = (read8(ACCEL_OFFSET_Y_MSB_ADDR) << 8) | (read8(ACCEL_OFFSET_Y_LSB_ADDR));

        offsets_type.accel_offset_z = (read8(ACCEL_OFFSET_Z_MSB_ADDR) << 8) | (read8(ACCEL_OFFSET_Z_LSB_ADDR));

        /* Magnetometer offset range = +/- 6400 LSB where 1uT = 16 LSB */

        offsets_type.mag_offset_x = (read8(MAG_OFFSET_X_MSB_ADDR) << 8) | (read8(MAG_OFFSET_X_LSB_ADDR));

        offsets_type.mag_offset_y = (read8(MAG_OFFSET_Y_MSB_ADDR) << 8) | (read8(MAG_OFFSET_Y_LSB_ADDR));

        offsets_type.mag_offset_z = (read8(MAG_OFFSET_Z_MSB_ADDR) << 8) | (read8(MAG_OFFSET_Z_LSB_ADDR));

        /* Gyro offset range depends on the DPS range:

          2000 dps = +/- 32000 LSB

          1000 dps = +/- 16000 LSB

           500 dps = +/- 8000 LSB

           250 dps = +/- 4000 LSB

           125 dps = +/- 2000 LSB

           ... where 1 DPS = 16 LSB */

        offsets_type.gyro_offset_x = (read8(GYRO_OFFSET_X_MSB_ADDR) << 8) | (read8(GYRO_OFFSET_X_LSB_ADDR));

        offsets_type.gyro_offset_y = (read8(GYRO_OFFSET_Y_MSB_ADDR) << 8) | (read8(GYRO_OFFSET_Y_LSB_ADDR));

        offsets_type.gyro_offset_z = (read8(GYRO_OFFSET_Z_MSB_ADDR) << 8) | (read8(GYRO_OFFSET_Z_LSB_ADDR));

        /* Accelerometer radius = +/- 1000 LSB */

        offsets_type.accel_radius = (read8(ACCEL_RADIUS_MSB_ADDR) << 8) | (read8(ACCEL_RADIUS_LSB_ADDR));

        /* Magnetometer radius = +/- 960 LSB */

        offsets_type.mag_radius = (read8(MAG_RADIUS_MSB_ADDR) << 8) | (read8(MAG_RADIUS_LSB_ADDR));

        setMode(lastMode);

        return true;

    }

    return false;

}

/**************************************************************************/

/*!

@brief  Writes an array of calibration values to the sensor's offset registers

*/

/**************************************************************************/

void Adafruit_BNO055::setSensorOffsets(const uint8_t* calibData)

{

    adafruit_bno055_opmode_t lastMode = _mode;

    setMode(OPERATION_MODE_CONFIG);

    delay(25);

    /* Note: Configuration will take place only when user writes to the last

       byte of each config data pair (ex. ACCEL_OFFSET_Z_MSB_ADDR, etc.).

       Therefore the last byte must be written whenever the user wants to

       changes the configuration. */

    /* A writeLen() would make this much cleaner */

    write8(ACCEL_OFFSET_X_LSB_ADDR, calibData[0]);

    write8(ACCEL_OFFSET_X_MSB_ADDR, calibData[1]);

    write8(ACCEL_OFFSET_Y_LSB_ADDR, calibData[2]);

    write8(ACCEL_OFFSET_Y_MSB_ADDR, calibData[3]);

    write8(ACCEL_OFFSET_Z_LSB_ADDR, calibData[4]);

    write8(ACCEL_OFFSET_Z_MSB_ADDR, calibData[5]);

    write8(MAG_OFFSET_X_LSB_ADDR, calibData[6]);

    write8(MAG_OFFSET_X_MSB_ADDR, calibData[7]);

    write8(MAG_OFFSET_Y_LSB_ADDR, calibData[8]);

    write8(MAG_OFFSET_Y_MSB_ADDR, calibData[9]);

    write8(MAG_OFFSET_Z_LSB_ADDR, calibData[10]);

    write8(MAG_OFFSET_Z_MSB_ADDR, calibData[11]);

    write8(GYRO_OFFSET_X_LSB_ADDR, calibData[12]);

    write8(GYRO_OFFSET_X_MSB_ADDR, calibData[13]);

    write8(GYRO_OFFSET_Y_LSB_ADDR, calibData[14]);

    write8(GYRO_OFFSET_Y_MSB_ADDR, calibData[15]);

    write8(GYRO_OFFSET_Z_LSB_ADDR, calibData[16]);

    write8(GYRO_OFFSET_Z_MSB_ADDR, calibData[17]);

    write8(ACCEL_RADIUS_LSB_ADDR, calibData[18]);

    write8(ACCEL_RADIUS_MSB_ADDR, calibData[19]);

    write8(MAG_RADIUS_LSB_ADDR, calibData[20]);

    write8(MAG_RADIUS_MSB_ADDR, calibData[21]);

    setMode(lastMode);

}

/**************************************************************************/

/*!

@brief  Writes to the sensor's offset registers from an offset struct

*/

/**************************************************************************/

void Adafruit_BNO055::setSensorOffsets(const adafruit_bno055_offsets_t &offsets_type)

{

    adafruit_bno055_opmode_t lastMode = _mode;

    setMode(OPERATION_MODE_CONFIG);

    delay(25);

    /* Note: Configuration will take place only when user writes to the last

       byte of each config data pair (ex. ACCEL_OFFSET_Z_MSB_ADDR, etc.).

       Therefore the last byte must be written whenever the user wants to

       changes the configuration. */

    write8(ACCEL_OFFSET_X_LSB_ADDR, (offsets_type.accel_offset_x) & 0x0FF);

    write8(ACCEL_OFFSET_X_MSB_ADDR, (offsets_type.accel_offset_x >> 8) & 0x0FF);

    write8(ACCEL_OFFSET_Y_LSB_ADDR, (offsets_type.accel_offset_y) & 0x0FF);

    write8(ACCEL_OFFSET_Y_MSB_ADDR, (offsets_type.accel_offset_y >> 8) & 0x0FF);

    write8(ACCEL_OFFSET_Z_LSB_ADDR, (offsets_type.accel_offset_z) & 0x0FF);

    write8(ACCEL_OFFSET_Z_MSB_ADDR, (offsets_type.accel_offset_z >> 8) & 0x0FF);

    write8(MAG_OFFSET_X_LSB_ADDR, (offsets_type.mag_offset_x) & 0x0FF);

    write8(MAG_OFFSET_X_MSB_ADDR, (offsets_type.mag_offset_x >> 8) & 0x0FF);

    write8(MAG_OFFSET_Y_LSB_ADDR, (offsets_type.mag_offset_y) & 0x0FF);

    write8(MAG_OFFSET_Y_MSB_ADDR, (offsets_type.mag_offset_y >> 8) & 0x0FF);

    write8(MAG_OFFSET_Z_LSB_ADDR, (offsets_type.mag_offset_z) & 0x0FF);

    write8(MAG_OFFSET_Z_MSB_ADDR, (offsets_type.mag_offset_z >> 8) & 0x0FF);

    write8(GYRO_OFFSET_X_LSB_ADDR, (offsets_type.gyro_offset_x) & 0x0FF);

    write8(GYRO_OFFSET_X_MSB_ADDR, (offsets_type.gyro_offset_x >> 8) & 0x0FF);

    write8(GYRO_OFFSET_Y_LSB_ADDR, (offsets_type.gyro_offset_y) & 0x0FF);

    write8(GYRO_OFFSET_Y_MSB_ADDR, (offsets_type.gyro_offset_y >> 8) & 0x0FF);

    write8(GYRO_OFFSET_Z_LSB_ADDR, (offsets_type.gyro_offset_z) & 0x0FF);

    write8(GYRO_OFFSET_Z_MSB_ADDR, (offsets_type.gyro_offset_z >> 8) & 0x0FF);

    write8(ACCEL_RADIUS_LSB_ADDR, (offsets_type.accel_radius) & 0x0FF);

    write8(ACCEL_RADIUS_MSB_ADDR, (offsets_type.accel_radius >> 8) & 0x0FF);

    write8(MAG_RADIUS_LSB_ADDR, (offsets_type.mag_radius) & 0x0FF);

    write8(MAG_RADIUS_MSB_ADDR, (offsets_type.mag_radius >> 8) & 0x0FF);

    setMode(lastMode);

}

/**************************************************************************/

/*!

    @brief  Checks of all cal status values are set to 3 (fully calibrated)

*/

/**************************************************************************/

bool Adafruit_BNO055::isFullyCalibrated(void)

{

    uint8_t system, gyro, accel, mag;

    getCalibration(&system, &gyro, &accel, &mag);

    if (system < 3 || gyro < 3 || accel < 3 || mag < 3)

        return false;

    return true;

}

/***************************************************************************

 PRIVATE FUNCTIONS

 ***************************************************************************/

/**************************************************************************/

/*!

    @brief  Writes an 8 bit value over I2C

*/

/**************************************************************************/

bool Adafruit_BNO055::write8(adafruit_bno055_reg_t reg, byte value)

{

  Wire.beginTransmission(_address);

  #if ARDUINO >= 100

    Wire.write((uint8_t)reg);

    Wire.write((uint8_t)value);

  #else

    Wire.send(reg);

    Wire.send(value);

  #endif

  Wire.endTransmission();

  /* ToDo: Check for error! */

  return true;

}

/**************************************************************************/

/*!

    @brief  Reads an 8 bit value over I2C

*/

/**************************************************************************/

byte Adafruit_BNO055::read8(adafruit_bno055_reg_t reg )

{

  byte value = 0;

  Wire.beginTransmission(_address);

  #if ARDUINO >= 100

    Wire.write((uint8_t)reg);

  #else

    Wire.send(reg);

  #endif

  Wire.endTransmission();

  Wire.requestFrom(_address, (byte)1);

  #if ARDUINO >= 100

    value = Wire.read();

  #else

    value = Wire.receive();

  #endif

  return value;

}

/**************************************************************************/

/*!

    @brief  Reads the specified number of bytes over I2C

*/

/**************************************************************************/

bool Adafruit_BNO055::readLen(adafruit_bno055_reg_t reg, byte * buffer, uint8_t len)

{

  Wire.beginTransmission(_address);

  #if ARDUINO >= 100

    Wire.write((uint8_t)reg);

  #else

    Wire.send(reg);

  #endif

  Wire.endTransmission();

  Wire.requestFrom(_address, (byte)len);

  for (uint8_t i = 0; i < len; i++)

  {

    #if ARDUINO >= 100

      buffer[i] = Wire.read();

    #else

      buffer[i] = Wire.receive();

    #endif

  }

  /* ToDo: Check for errors! */

  return true;

}