I2C Accelerometer library

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

MMA8491.cpp

Committer:
AswinSivakumar
Date:
2016-03-23
Revision:
0:4f7ab3a47e7b
Child:
1:ce9ae6fa9407

File content as of revision 0:4f7ab3a47e7b:

 /* Copyright (c) 2015 NXP Semiconductors. MIT License
*
* 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 "MMA8491.h"
#include "mbed.h"

MMA8491::MMA8491(PinName sda, PinName scl, PinName en) : MMA8491_i2c(sda,scl),MMA8491_en(en)
 {
    MMA8491_en=0;
 }
    
 void MMA8491::acquire_MMA8491_data_g(float * a_data)
 {
  
   char data_bytes[7];
   char d[1];
     
   MMA8491_en=1;
   wait(0.001);
   d[0]=MMA8491_STATUS;
   MMA8491_i2c.write(MMA8491_I2C_ADDRESS,d,1,true);  
   MMA8491_i2c.read(MMA8491_I2C_ADDRESS,data_bytes,7);// Read the 6 data bytes - LSB and MSB for X, Y and Z Axes.
   MMA8491_en=0;
  
   
   // a_data[0]= ((float)((int16_t)data_bytes[1]));
   a_data[0] =  ((float)((int16_t)(((data_bytes[1]*256) + (data_bytes[2])))>> 2) * 0.0009765);
   a_data[1] =  ((float)((int16_t)(((data_bytes[3]*256) + (data_bytes[4])))>> 2) * 0.0009765);
   a_data[2] =  ((float)((int16_t)(((data_bytes[5]*256) + (data_bytes[6])))>> 2) * 0.0009765);
   
 }