File content as of revision 6:b2bb387caf3f:

#include "MAG3110.h"

/******************************************************************************
 * Constructors
 ******************************************************************************/
MAG3110::MAG3110(PinName sda, PinName scl): _i2c(sda, scl)
{
    begin();
}

void MAG3110::begin()
{
    char cmd[2];

    cmd[0] = MAG_CTRL_REG2;
    cmd[1] = 0x80;
    _i2c.write(MAG_ADDR, cmd, 2);

    cmd[0] = MAG_CTRL_REG1;
    cmd[1] = MAG_3110_SAMPLE80+MAG_3110_OVERSAMPLE2+MAG_3110_ACTIVE;
    _i2c.write(MAG_ADDR, cmd, 2);
    
    // No adjustment initially
    _avgX = 0;
    _avgY = 0;
}

// Read a single byte form 8 bit register, return as int
int MAG3110::readReg(char regAddr)
{
    char cmd[1];

    cmd[0] = regAddr;
    _i2c.write(MAG_ADDR, cmd, 1);

    cmd[0] = 0x00;
    _i2c.read(MAG_ADDR, cmd, 1);
    return (int)( cmd[0]);
}


// read a register per, pass first reg value, reading 2 bytes increments register
// Reads MSB first then LSB
int MAG3110::readVal(char regAddr)
{
    char cmd[2];

    cmd[0] = regAddr;
    _i2c.write(MAG_ADDR, cmd, 1);

    cmd[0] = 0x00;
    cmd[1] = 0x00;
    _i2c.read(MAG_ADDR, cmd, 2);
    return (int)( (cmd[1]|(cmd[0] << 8))); //concatenate the MSB and LSB
}

void MAG3110::getValues(int *xVal, int *yVal, int *zVal)
{
    *xVal = readVal(MAG_OUT_X_MSB);
    *yVal = readVal(MAG_OUT_Y_MSB);
    *zVal = readVal(MAG_OUT_Z_MSB);
}


void MAG3110::setCalibration(float minX, float maxX, float minY, float maxY, float minZ, float maxZ)
{
    _avgX=(maxX+minX)/2;
    _avgY=(maxY+minY)/2;
    _avgZ=(maxZ+minZ)/2;
}

void MAG3110::get_uT(float *uT)
{
   char data_bytes[7];
   char d[1];
   d[0]=MAG3110_DR_STATUS;
   
   _i2c.write(MAG_ADDR,d,1,true);  
   _i2c.read(MAG_ADDR,data_bytes,7);// Read the 6 data bytes - LSB and MSB for X, Y and Z Axes.
 
   *uT[0] =  (float)((int16_t)((data_bytes[1]*256) + (data_bytes[2]))) * 0.1;
   *uT[1] =  (float)((int16_t)((data_bytes[3]*256) + (data_bytes[4]))) * 0.1;
   *uT[2] =  (float)((int16_t)((data_bytes[5]*256) + (data_bytes[6]))) * 0.1;
}