NXP / MMA8491

I2C Accelerometer library

Dependents:   FRDMSTBC-A8491_SensorShield xtrinsic_sensors 1-FRDM-Gimbal-LAB

MMA8491.cpp@1:ce9ae6fa9407, 2017-04-24 (annotated)

Committer:
AswinSivakumar
Date:
Mon Apr 24 19:01:19 2017 +0000
Revision:
1:ce9ae6fa9407
Parent:
0:4f7ab3a47e7b 
updated

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AswinSivakumar 1:ce9ae6fa9407 1 /*
AswinSivakumar 1:ce9ae6fa9407 2 * Copyright (c) 2015 - 2016, Freescale Semiconductor, Inc.
AswinSivakumar 1:ce9ae6fa9407 3 * Copyright 2016-2017 NXP
AswinSivakumar 1:ce9ae6fa9407 4 *
AswinSivakumar 1:ce9ae6fa9407 5 * Redistribution and use in source and binary forms, with or without modification,
AswinSivakumar 1:ce9ae6fa9407 6 * are permitted provided that the following conditions are met:
AswinSivakumar 1:ce9ae6fa9407 7 *
AswinSivakumar 1:ce9ae6fa9407 8 * o Redistributions of source code must retain the above copyright notice, this list
AswinSivakumar 1:ce9ae6fa9407 9 * of conditions and the following disclaimer.
AswinSivakumar 1:ce9ae6fa9407 10 *
AswinSivakumar 1:ce9ae6fa9407 11 * o Redistributions in binary form must reproduce the above copyright notice, this
AswinSivakumar 1:ce9ae6fa9407 12 * list of conditions and the following disclaimer in the documentation and/or
AswinSivakumar 1:ce9ae6fa9407 13 * other materials provided with the distribution.
AswinSivakumar 1:ce9ae6fa9407 14 *
AswinSivakumar 1:ce9ae6fa9407 15 * o Neither the name of the copyright holder nor the names of its
AswinSivakumar 1:ce9ae6fa9407 16 * contributors may be used to endorse or promote products derived from this
AswinSivakumar 1:ce9ae6fa9407 17 * software without specific prior written permission.
AswinSivakumar 1:ce9ae6fa9407 18 *
AswinSivakumar 1:ce9ae6fa9407 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
AswinSivakumar 1:ce9ae6fa9407 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
AswinSivakumar 1:ce9ae6fa9407 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
AswinSivakumar 1:ce9ae6fa9407 22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
AswinSivakumar 1:ce9ae6fa9407 23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
AswinSivakumar 1:ce9ae6fa9407 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
AswinSivakumar 1:ce9ae6fa9407 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
AswinSivakumar 1:ce9ae6fa9407 26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
AswinSivakumar 1:ce9ae6fa9407 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
AswinSivakumar 1:ce9ae6fa9407 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
AswinSivakumar 1:ce9ae6fa9407 29 */
AswinSivakumar 0:4f7ab3a47e7b 30
AswinSivakumar 0:4f7ab3a47e7b 31 #include "MMA8491.h"
AswinSivakumar 0:4f7ab3a47e7b 32 #include "mbed.h"
AswinSivakumar 0:4f7ab3a47e7b 33
AswinSivakumar 0:4f7ab3a47e7b 34 MMA8491::MMA8491(PinName sda, PinName scl, PinName en) : MMA8491_i2c(sda,scl),MMA8491_en(en)
AswinSivakumar 0:4f7ab3a47e7b 35 {
AswinSivakumar 0:4f7ab3a47e7b 36 MMA8491_en=0;
AswinSivakumar 0:4f7ab3a47e7b 37 }
AswinSivakumar 0:4f7ab3a47e7b 38
AswinSivakumar 0:4f7ab3a47e7b 39 void MMA8491::acquire_MMA8491_data_g(float * a_data)
AswinSivakumar 0:4f7ab3a47e7b 40 {
AswinSivakumar 0:4f7ab3a47e7b 41
AswinSivakumar 0:4f7ab3a47e7b 42 char data_bytes[7];
AswinSivakumar 0:4f7ab3a47e7b 43 char d[1];
AswinSivakumar 0:4f7ab3a47e7b 44
AswinSivakumar 0:4f7ab3a47e7b 45 MMA8491_en=1;
AswinSivakumar 0:4f7ab3a47e7b 46 wait(0.001);
AswinSivakumar 0:4f7ab3a47e7b 47 d[0]=MMA8491_STATUS;
AswinSivakumar 0:4f7ab3a47e7b 48 MMA8491_i2c.write(MMA8491_I2C_ADDRESS,d,1,true);
AswinSivakumar 0:4f7ab3a47e7b 49 MMA8491_i2c.read(MMA8491_I2C_ADDRESS,data_bytes,7);// Read the 6 data bytes - LSB and MSB for X, Y and Z Axes.
AswinSivakumar 0:4f7ab3a47e7b 50 MMA8491_en=0;
AswinSivakumar 0:4f7ab3a47e7b 51
AswinSivakumar 0:4f7ab3a47e7b 52
AswinSivakumar 0:4f7ab3a47e7b 53 // a_data[0]= ((float)((int16_t)data_bytes[1]));
AswinSivakumar 0:4f7ab3a47e7b 54 a_data[0] = ((float)((int16_t)(((data_bytes[1]*256) + (data_bytes[2])))>> 2) * 0.0009765);
AswinSivakumar 0:4f7ab3a47e7b 55 a_data[1] = ((float)((int16_t)(((data_bytes[3]*256) + (data_bytes[4])))>> 2) * 0.0009765);
AswinSivakumar 0:4f7ab3a47e7b 56 a_data[2] = ((float)((int16_t)(((data_bytes[5]*256) + (data_bytes[6])))>> 2) * 0.0009765);
AswinSivakumar 0:4f7ab3a47e7b 57
AswinSivakumar 0:4f7ab3a47e7b 58 }
AswinSivakumar 0:4f7ab3a47e7b 59
AswinSivakumar 0:4f7ab3a47e7b 60