File content as of revision 2:01b627381f0d:

#define i2c2_sda D3 //D14
#define i2c2_scl D6 //D15

#define SourceVH 0x58
#define SourceVL 0x59
#define SenseVH 0x54
#define SenseVL 0x55
#define PowerH 0x5B
#define PowerL 0x5C

I2C i2c2_PM(i2c2_sda, i2c2_scl);

class powerMon
{
    private:
        int w_addr,r_addr;

    public:
    powerMon(int addr_sel)
    {
        switch(addr_sel)
        {
             case 0:        w_addr=0x98; break;
             case 100:      w_addr=0x9A; break;
             case 180:      w_addr=0x9C; break;
             case 300:      w_addr=0x9E; break;
             case 430:      w_addr=0x90; break;
             case 560:      w_addr=0x92; break;
             case 750:      w_addr=0x94; break;
             case 1270:     w_addr=0x96; break;
             case 1600:     w_addr=0x50; break;
             case 2000:     w_addr=0x52; break;
             case 2700:     w_addr=0x54; break;
             case 3600:     w_addr=0x56; break;
             case 5600:     w_addr=0x58; break;
             case 9100:     w_addr=0x58; break;
             case 20000:    w_addr=0x5A; break;
             case -1:       w_addr=0x30; break;
        }  
        r_addr = w_addr + 0x01;
    }

    double V_Sense()
    {
        double volt=0,mult_fac=1,offset=0;
        char buffer[2];
        buffer[0]=SenseVL;
        i2c2_PM.write(r_addr,buffer, 1,true);
        i2c2_PM.read(r_addr, buffer,1);
        volt=buffer[0]/16;
        buffer[0]=SenseVH;
        i2c2_PM.write(r_addr,buffer, 1,true);
        i2c2_PM.read(r_addr, buffer,1);
        volt += (buffer[0] & 0x7f)*16;
        volt = (volt*mult_fac)+offset;
        return (buffer[0]&0x80)?-volt:volt;
    }    
    
    double V_Source()
    {
        double volt=0;
        char buffer[2];
        buffer[0]=SourceVL;
        i2c2_PM.write(r_addr,buffer, 1,true);
        i2c2_PM.read(r_addr, buffer,1);
        volt=buffer[0]/32;
        buffer[0]=SourceVH;
        i2c2_PM.write(r_addr,buffer, 1,true);
        i2c2_PM.read(r_addr, buffer,1);
        volt += buffer[0]*8;
        
        return (volt/2048.0000)*23.9883;
    }    
    
    double Current()
    {
        return (V_Sense()/2047.0000)*(8.0000);
    }
        
    long Power_Ratio()
    {
        long power_r=0;
        char buffer[2];
        buffer[0]=PowerL;
        i2c2_PM.write(r_addr,buffer, 1,true);
        i2c2_PM.read(r_addr, buffer,1);
        power_r=buffer[0];
        buffer[0]=PowerH;
        i2c2_PM.write(r_addr,buffer, 1,true);
        i2c2_PM.read(r_addr, buffer,1);
        power_r += buffer[0]*256;
        
        return power_r;
    }
    
    double Power()
    {
       return (Power_Ratio()/65535.0000)*(8.0000*23.9883);
    }
};