RobotHardware-UESTC/Hardware/Firmware/Gebot_Firmware v1.0/STM32/Lib/IMU/ADXL345.cpp

// I2Cdev library collection - ADXL345 I2C device class
// Based on Analog Devices ADXL345 datasheet rev. C, 5/2011
// 7/31/2011 by Jeff Rowberg <jeff@rowberg.net>
// Updates should (hopefully) always be available at https://github.com/jrowberg/i2cdevlib
//
// Changelog:
//     2011-07-31 - initial release

/* ============================================
I2Cdev device library code is placed under the MIT license
Copyright (c) 2011 Jeff Rowberg

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
===============================================
*/

#include "ADXL345.h"
#include "board.h"

/** Default constructor, uses default I2C address.
 * @see ADXL345_DEFAULT_ADDRESS
 */
ADXL345::ADXL345() {
    devAddr = ADXL345_DEFAULT_ADDRESS;
}

/** Specific address constructor.
 * @param address I2C address
 * @see ADXL345_DEFAULT_ADDRESS
 * @see ADXL345_ADDRESS_ALT_LOW
 * @see ADXL345_ADDRESS_ALT_HIGH
 */
ADXL345::ADXL345(unsigned char address) {
    devAddr = address;
}

/** Power on and prepare for general usage.
 * This will activate the accelerometer, so be sure to adjust the power settings
 * after you call this method if you want it to enter standby mode, or another
 * less demanding mode of operation.
 */
void ADXL345::initialize() {
    Board::get()->i2c_write_byte(devAddr, ADXL345_RA_POWER_CTL, 0); // reset all power settings
    setAutoSleepEnabled(true);
    setMeasureEnabled(true);
}

/** Verify the I2C connection.
 * Make sure the device is connected and responds as expected.
 * @return True if connection is valid, false otherwise
 */
bool ADXL345::testConnection() {
    return getDeviceID() == 0xE5;
}

// DEVID register

/** Get Device ID.
 * The DEVID register holds a fixed device ID code of 0xE5 (345 octal).
 * @return Device ID (should be 0xE5, 229 dec, 345 oct)
 * @see ADXL345_RA_DEVID
 */
unsigned char ADXL345::getDeviceID() {
    Board::get()->i2c_read_buf(devAddr, ADXL345_RA_DEVID, buffer, 1);
    return buffer[0];
}

// BW_RATE register

/** Set low power enabled status.
 * @see getLowPowerEnabled()
 * @param enabled Low power enable setting
 * @see ADXL345_RA_BW_RATE
 * @see ADXL345_BW_LOWPOWER_BIT
 */
void ADXL345::setLowPowerEnabled(bool enabled) {
    Board::get()->i2c_write_bit(devAddr, ADXL345_RA_BW_RATE, ADXL345_BW_LOWPOWER_BIT, enabled);
}

/** Set measurement data rate.
 * 0x7 =  12.5Hz
 * 0x8 =  25Hz, increasing or decreasing by factors of 2, so:
 * 0x9 =  50Hz
 * 0xA = 100Hz
 * @param rate New data rate (0x0 - 0xF)
 * @see ADXL345_RATE_100
 * @see ADXL345_RA_BW_RATE
 * @see ADXL345_BW_RATE_BIT
 * @see ADXL345_BW_RATE_LENGTH
 */
void ADXL345::setRate(unsigned char rate) {
    Board::get()->i2c_write_bits(devAddr, ADXL345_RA_BW_RATE, ADXL345_BW_RATE_BIT, ADXL345_BW_RATE_LENGTH, rate);
}

// POWER_CTL register
/** Set auto-sleep enabled status.
 * @param enabled New auto-sleep status
 * @see getAutoSleepEnabled()
 * @see ADXL345_RA_POWER_CTL
 * @see ADXL345_PCTL_AUTOSLEEP_BIT
 */
void ADXL345::setAutoSleepEnabled(bool enabled) {
    Board::get()->i2c_write_bit(devAddr, ADXL345_RA_POWER_CTL, ADXL345_PCTL_AUTOSLEEP_BIT, enabled);
}

/** Set measurement enabled status.
 * @param enabled Measurement enabled status
 * @see getMeasureEnabled()
 * @see ADXL345_RA_POWER_CTL
 * @see ADXL345_PCTL_MEASURE_BIT
 */
void ADXL345::setMeasureEnabled(bool enabled) {
    Board::get()->i2c_write_bit(devAddr, ADXL345_RA_POWER_CTL, ADXL345_PCTL_MEASURE_BIT, enabled);
}

// DATA_FORMAT register

/** Set self-test force enabled.
 * @param enabled New self-test force enabled setting
 * @see getSelfTestEnabled()
 * @see ADXL345_RA_DATA_FORMAT
 * @see ADXL345_FORMAT_SELFTEST_BIT
 */
void ADXL345::setSelfTestEnabled(unsigned char enabled) {
    Board::get()->i2c_write_bit(devAddr, ADXL345_RA_DATA_FORMAT, ADXL345_FORMAT_SELFTEST_BIT, enabled);
}

/** Set interrupt mode setting.
 * @param mode New interrupt mode setting
 * @see getInterruptMode()
 * @see ADXL345_RA_DATA_FORMAT
 * @see ADXL345_FORMAT_INTMODE_BIT
 */
void ADXL345::setInterruptMode(unsigned char mode) {
    Board::get()->i2c_write_bit(devAddr, ADXL345_RA_DATA_FORMAT, ADXL345_FORMAT_INTMODE_BIT, mode);
}

/** Set full resolution mode setting.
 * @param resolution New full resolution enabled setting
 * @see getFullResolution()
 * @see ADXL345_RA_DATA_FORMAT
 * @see ADXL345_FORMAT_FULL_RES_BIT
 */
void ADXL345::setFullResolution(unsigned char resolution) {
    Board::get()->i2c_write_bit(devAddr, ADXL345_RA_DATA_FORMAT, ADXL345_FORMAT_FULL_RES_BIT, resolution);
}

/** Set data range setting.
 * @param range Range value (0x0 - 0x3 for 2g/4g/8g/16g)
 * @see getRange()
 * @see ADXL345_RA_DATA_FORMAT
 * @see ADXL345_FORMAT_RANGE_BIT
 * @see ADXL345_FORMAT_RANGE_LENGTH
 */
void ADXL345::setRange(unsigned char range) {
    Board::get()->i2c_write_bits(devAddr, ADXL345_RA_DATA_FORMAT, ADXL345_FORMAT_RANGE_BIT, ADXL345_FORMAT_RANGE_LENGTH, range);
}

// DATA* registers

/** Get 3-axis accleration measurements.
 * These six bytes (Register 0x32 to Register 0x37) are eight bits each and hold
 * the output data for each axis. Register 0x32 and Register 0x33 hold the
 * output data for the x-axis, Register 0x34 and Register 0x35 hold the output
 * data for the y-axis, and Register 0x36 and Register 0x37 hold the output data
 * for the z-axis. The output data is twos complement, with DATAx0 as the least
 * significant byte and DATAx1 as the most significant byte, where x represent
 * X, Y, or Z. The DATA_FORMAT register (Address 0x31) controls the format of
 * the data. It is recommended that a multiple-byte read of all registers be
 * performed to prevent a change in data between reads of sequential registers.
 * 
 * The DATA_FORMAT register controls the presentation of data to Register 0x32
 * through Register 0x37. All data, except that for the +/-16 g range, must be
 * clipped to avoid rollover.
 *
 * @param x 16-bit signed integer container for X-axis acceleration
 * @param y 16-bit signed integer container for Y-axis acceleration
 * @param z 16-bit signed integer container for Z-axis acceleration
 * @see ADXL345_RA_DATAX0
 */
void ADXL345::getAcceleration(short* x, short* y, short* z) {
    Board::get()->i2c_read_buf(devAddr, ADXL345_RA_DATAX0, buffer, 6);
    *x = (((short)buffer[1]) << 8) | buffer[0];
    *y = (((short)buffer[3]) << 8) | buffer[2];
    *z = (((short)buffer[5]) << 8) | buffer[4];
}