NXP / MMA8491

I2C Accelerometer library

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

MMA8491.cpp@0:4f7ab3a47e7b, 2016-03-23 (annotated)

Committer:
AswinSivakumar
Date:
Wed Mar 23 07:07:06 2016 +0000
Revision:
0:4f7ab3a47e7b
Child:
1:ce9ae6fa9407
Initial commit;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AswinSivakumar 0:4f7ab3a47e7b 1 /* Copyright (c) 2015 NXP Semiconductors. MIT License
AswinSivakumar 0:4f7ab3a47e7b 2 *
AswinSivakumar 0:4f7ab3a47e7b 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
AswinSivakumar 0:4f7ab3a47e7b 4 * and associated documentation files (the "Software"), to deal in the Software without
AswinSivakumar 0:4f7ab3a47e7b 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
AswinSivakumar 0:4f7ab3a47e7b 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
AswinSivakumar 0:4f7ab3a47e7b 7 * Software is furnished to do so, subject to the following conditions:
AswinSivakumar 0:4f7ab3a47e7b 8 *
AswinSivakumar 0:4f7ab3a47e7b 9 * The above copyright notice and this permission notice shall be included in all copies or
AswinSivakumar 0:4f7ab3a47e7b 10 * substantial portions of the Software.
AswinSivakumar 0:4f7ab3a47e7b 11 *
AswinSivakumar 0:4f7ab3a47e7b 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
AswinSivakumar 0:4f7ab3a47e7b 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
AswinSivakumar 0:4f7ab3a47e7b 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
AswinSivakumar 0:4f7ab3a47e7b 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
AswinSivakumar 0:4f7ab3a47e7b 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
AswinSivakumar 0:4f7ab3a47e7b 17 */
AswinSivakumar 0:4f7ab3a47e7b 18
AswinSivakumar 0:4f7ab3a47e7b 19 #include "MMA8491.h"
AswinSivakumar 0:4f7ab3a47e7b 20 #include "mbed.h"
AswinSivakumar 0:4f7ab3a47e7b 21
AswinSivakumar 0:4f7ab3a47e7b 22 MMA8491::MMA8491(PinName sda, PinName scl, PinName en) : MMA8491_i2c(sda,scl),MMA8491_en(en)
AswinSivakumar 0:4f7ab3a47e7b 23 {
AswinSivakumar 0:4f7ab3a47e7b 24 MMA8491_en=0;
AswinSivakumar 0:4f7ab3a47e7b 25 }
AswinSivakumar 0:4f7ab3a47e7b 26
AswinSivakumar 0:4f7ab3a47e7b 27 void MMA8491::acquire_MMA8491_data_g(float * a_data)
AswinSivakumar 0:4f7ab3a47e7b 28 {
AswinSivakumar 0:4f7ab3a47e7b 29
AswinSivakumar 0:4f7ab3a47e7b 30 char data_bytes[7];
AswinSivakumar 0:4f7ab3a47e7b 31 char d[1];
AswinSivakumar 0:4f7ab3a47e7b 32
AswinSivakumar 0:4f7ab3a47e7b 33 MMA8491_en=1;
AswinSivakumar 0:4f7ab3a47e7b 34 wait(0.001);
AswinSivakumar 0:4f7ab3a47e7b 35 d[0]=MMA8491_STATUS;
AswinSivakumar 0:4f7ab3a47e7b 36 MMA8491_i2c.write(MMA8491_I2C_ADDRESS,d,1,true);
AswinSivakumar 0:4f7ab3a47e7b 37 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 38 MMA8491_en=0;
AswinSivakumar 0:4f7ab3a47e7b 39
AswinSivakumar 0:4f7ab3a47e7b 40
AswinSivakumar 0:4f7ab3a47e7b 41 // a_data[0]= ((float)((int16_t)data_bytes[1]));
AswinSivakumar 0:4f7ab3a47e7b 42 a_data[0] = ((float)((int16_t)(((data_bytes[1]*256) + (data_bytes[2])))>> 2) * 0.0009765);
AswinSivakumar 0:4f7ab3a47e7b 43 a_data[1] = ((float)((int16_t)(((data_bytes[3]*256) + (data_bytes[4])))>> 2) * 0.0009765);
AswinSivakumar 0:4f7ab3a47e7b 44 a_data[2] = ((float)((int16_t)(((data_bytes[5]*256) + (data_bytes[6])))>> 2) * 0.0009765);
AswinSivakumar 0:4f7ab3a47e7b 45
AswinSivakumar 0:4f7ab3a47e7b 46 }
AswinSivakumar 0:4f7ab3a47e7b 47
AswinSivakumar 0:4f7ab3a47e7b 48