File content as of revision 1:b4139bd2715f:

#include "ColorSensor.h"

//sda and scl are for your i2c pins
ColorSensor::ColorSensor(PinName sda, PinName scl) : i2c(sda, scl)
{
    //power on device and ADCs
    i2c.write(ADDR, CTRL, 1);
    i2c.write(ADDR, CTRL_INIT, 1);
    
    //intial gain is 4x, scaler is 1x
    i2c.write(ADDR, GAIN, 1);
    i2c.write(ADDR, GAIN_INIT, 1);
}

//returns red value
int ColorSensor::getR()
{
    int red;
    char data;
    
    i2c.write(ADDR, RED_LO, 1);
    i2c.read(ADDR, &data, 1);
    red = data;
    i2c.write(ADDR, RED_HI, 1);
    i2c.read(ADDR, &data, 1);
    red += 256*data;
    
    return red;
}

//returns green value
int ColorSensor::getG()
{
    int grn;
    char data;
    
    i2c.write(ADDR, GRN_LO, 1);
    i2c.read(ADDR, &data, 1);
    grn = data;
    i2c.write(ADDR, GRN_HI, 1);
    i2c.read(ADDR, &data, 1);
    grn += 256*data;
    
    return grn;
}

//returns blue value
int ColorSensor::getB()
{
    int blu;
    char data;
    
    i2c.write(ADDR, BLU_LO, 1);
    i2c.read(ADDR, &data, 1);
    blu = data;
    i2c.write(ADDR, BLU_HI, 1);
    i2c.read(ADDR, &data, 1);
    blu += 256*data;
    
    return blu;
}

//returns clear value
int ColorSensor::getC()
{
    int clr;
    char data;
    
    i2c.write(ADDR, CLR_LO, 1);
    i2c.read(ADDR, &data, 1);
    clr = data;
    i2c.write(ADDR, CLR_HI, 1);
    i2c.read(ADDR, &data, 1);
    clr += 256*data;
    
    return clr;
}

//sets ADC gain
//valid values 1, 4, 16, 64
void ColorSensor::setGain(int g)
{       
    char newGain;
    
    switch(g)
    {
        case 1: newGain = 0x00;
            break;
        case 4: newGain = 0x10;
            break;
        case 16: newGain = 0x20;
            break;
        case 64: newGain = 0x30;
            break;
        default: return;
    }
    
    gain = g;
    
    switch(scale)
    {
        case 1: newGain += 0x00;
            break;
        case 2: newGain += 0x01;
            break;
        case 4: newGain += 0x02;
            break;
        case 8: newGain += 0x03;
            break;
        case 16: newGain += 0x04;
            break;
        case 32: newGain += 0x05;
            break;
        case 64: newGain += 0x06;
    }
    
    i2c.write(ADDR, GAIN, 1);
    i2c.write(ADDR, &newGain, 1);
}

//sets divides ADC sensitivity by scaler
//valid values 1, 2, 4, 8, 16, 32, 64
void ColorSensor::setScaler(int s)
{
    char newGain;
    
    switch(s)
    {
        case 1: newGain = 0x00;
            break;
        case 2: newGain = 0x01;
            break;
        case 4: newGain = 0x02;
            break;
        case 8: newGain = 0x03;
            break;
        case 16: newGain = 0x04;
            break;
        case 32: newGain = 0x05;
            break;
        case 64: newGain = 0x06;
            break;
        default: return;
    }
    
    scale = s;
    
    switch(gain)
    {
        case 1: newGain += 0x00;
            break;
        case 4: newGain += 0x10;
            break;
        case 16: newGain += 0x20;
            break;
        case 64: newGain += 0x30;
    }
    
    i2c.write(ADDR, GAIN, 1);
    i2c.write(ADDR, &newGain, 1);
}