MAG3110.cpp

00001 /*
00002  * Copyright (c) 2015 - 2016, Freescale Semiconductor, Inc.
00003  * Copyright 2016-2017 NXP
00004  *
00005  * Redistribution and use in source and binary forms, with or without modification,
00006  * are permitted provided that the following conditions are met:
00007  *
00008  * o Redistributions of source code must retain the above copyright notice, this list
00009  *   of conditions and the following disclaimer.
00010  *
00011  * o Redistributions in binary form must reproduce the above copyright notice, this
00012  *   list of conditions and the following disclaimer in the documentation and/or
00013  *   other materials provided with the distribution.
00014  *
00015  * o Neither the name of the copyright holder nor the names of its
00016  *   contributors may be used to endorse or promote products derived from this
00017  *   software without specific prior written permission.
00018  *
00019  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
00020  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00021  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00022  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
00023  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00024  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
00025  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
00026  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00027  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00028  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00029  */
00030 
00031 #include "MAG3110.h"
00032  #include "mbed.h"
00033 
00034 MAG3110::MAG3110(PinName sda, PinName scl) : MAG3110_i2c(sda,scl)
00035  {
00036        
00037  }
00038     
00039  
00040   void MAG3110::MAG3110_config(void)
00041  {
00042    char d[2];
00043    d[0] = MAG3110_CTRL_REG1;                     //Puts device in Standby mode
00044    d[1] = 0x00;
00045    MAG3110_i2c.write(MAG3110_I2C_ADDRESS, d,2);   
00046           
00047       
00048    d[0] = MAG3110_CTRL_REG2;                   //Set Automatic Magnetic Sensor Reset bit
00049    d[1] = 0x80;
00050    MAG3110_i2c.write(MAG3110_I2C_ADDRESS, d, 2);   
00051    
00052    d[0] = MAG3110_CTRL_REG1;                   //Set ODR=40Hz and OSR=32 and set device to active mode.
00053    d[1] = 0x09;
00054    MAG3110_i2c.write(MAG3110_I2C_ADDRESS, d, 2);   
00055  
00056    
00057  }
00058  
00059  void MAG3110::acquire_MAG3110_data_uT(float * m_data)
00060  {
00061   
00062    char data_bytes[7];
00063    char d[1];
00064    d[0]=MAG3110_DR_STATUS;
00065    MAG3110_i2c.write(MAG3110_I2C_ADDRESS,d,1,true);  
00066    MAG3110_i2c.read(MAG3110_I2C_ADDRESS,data_bytes,7);// Read the 6 data bytes - LSB and MSB for X, Y and Z Axes.
00067 
00068    m_data[0] =  (float)((int16_t)((data_bytes[1]*256) + (data_bytes[2]))) * 0.1;
00069    m_data[1] =  (float)((int16_t)((data_bytes[3]*256) + (data_bytes[4]))) * 0.1;
00070    m_data[2] =  (float)((int16_t)((data_bytes[5]*256) + (data_bytes[6]))) * 0.1;
00071    
00072  }
00073      
00074