pi4j max17043 lipo fuel gauge i2c library help

[simon]

hey 

so i'm working on a library / helper class to control / work with a max17043 data sheet chip  this chip is able to measure and calculate a state of your lipo battery 

as this is my first time using i2c and in general first time building a library for a bus control device i'm having some problems currently i'm struggling with setting the alert trigger level 

work log

QuickStart function  ( pretty sure this works no way to confirm )

reset function (  pretty sure this works no way to confirm)

getSoC function (output seems to be right scaled based on vCell's output but not a 100% if the output is right)

getVcell function (seems to be within a responsible margin of error )

ReadConfig function ( output fits what shut be the default setting so function shut be right )

getVersion function ( works gets the right version number)

getAlertThreshold function (works gets the right default value needs to be reconfirmed once the set alert trigger function works)

SleepMode on / off function ( work has not started but help is properly gonna be need )

so my question is can anyone help me write the function that sets the alert trigger level and how can i use the sleep mode part of the chip / access the register which sets sleep mode on and off ?



this is all my code so far 

public class Main {

    static byte address = 0x36;


    static byte VCELL_REGISTER =(byte)0x02;
    static byte SOC_REGISTER      =(byte)0x04;
    static byte MODE_REGISTER  =(byte)0x06;
    static byte VERSION_REGISTER   =(byte)0x08;
    static byte CONFIG_REGISTER    =(byte)0x0C;
    static byte COMMAND_REGISTER= (byte) 0xFE;

    public static void main(String[] args) throws IOException, I2CFactory.UnsupportedBusNumberException, InterruptedException {
   // write your code here

        I2CBus i2c = I2CFactory.getInstance(I2CBus.BUS_1);

        I2CDevice device = i2c.getDevice(address);


        reset(device);
        QuickStart(device);
        getSoC(device);

        getVCell(device);


        ReadConfig(device);
        GetVersion(device);


        getAlertThreshold(device);
        setAlertThreshold(device,20);
        getAlertThreshold(device);



    }

    private static int GetVersion(I2CDevice device) throws IOException {
        System.out.println("getting device version // shut be version 3//");

        int response = device.read(VERSION_REGISTER);
        System.out.println(("repsonse : "+String.format("0x%02x", response) + " raw response : " + response));
//        byte r1 = (byte) (response<<8);
//
//        System.out.println("modified response : " + r1);

        return response;

    }

    private static void reset(I2CDevice device) throws IOException {
        System.out.println("device reset ");

        device.write(COMMAND_REGISTER);
        device.write((byte)0x00);
        device.write((byte)0x54);
    }

    private static void setAlertThreshold(I2CDevice device,int alertLevel) throws IOException {
        System.out.println("Setting the alert threadhold to : " + alertLevel + "% // default level is 4%//");
        System.out.println("dos not work atm ");
        int response =device.read();

        if(alertLevel>32){
            alertLevel=32;
        }

        device.write(CONFIG_REGISTER);
        device.write((byte)0x00);
        device.write((byte) 0x00);
        device.write((byte)0x00);
        device.write((byte) 00010);

    }

    private static void getAlertThreshold(I2CDevice device) throws IOException {
        System.out.println("reading the alert Threshold default // default value is 4 % // ");

        int response =device.read();
        System.out.println(("repsonse : "+String.format("0x%02x", response) + " raw response : " + response));

        int r1 = 32 - response & 0x1F;

        System.out.println("modified response : " + r1);
    }

    private static void getSoC(I2CDevice device) throws IOException {
        System.out.println("getting soc");
        int response = device.read(SOC_REGISTER);

        System.out.println("repsonse : "+String.format("0x%02x", response) + " raw response : " + response);

    }

    private static void getVCell(I2CDevice device) throws IOException {

       int response = device.read(VCELL_REGISTER);
        byte i = (byte) response;
        double i2 = i&0xff;
        System.out.println(i);
        System.out.println(i2);
        double i3 = (5.0/255.0);
        System.out.println(i3);
        double i4 = i3*i2;
        System.out.println(i4);
        System.out.println("repsonse : "+String.format("0x%02x", response) + " raw response : " + ((byte) response& 0xff) + " vCell = " + i4 );

    }

    private static void ReadConfig(I2CDevice device) throws IOException {
        int response =0;
        System.out.println("reading the config register default value 0x97 ");
        // no idear how to change / the gain off chaing this value
        response = device.read(CONFIG_REGISTER);
        System.out.println(("repsonse : "+String.format("0x%02x", response) + " raw response : " + response));

    }


    public static void QuickStart(I2CDevice device) throws IOException {
        int response = 0;
        System.out.println("write the mode Register traying to do a quickStart");
        device.write(MODE_REGISTER);
        device.write((byte)0x40);
        device.write((byte) 0x00);

        response = device.read();
        System.out.println(("repsonse : "+String.format("0x%02x", response) + " raw response : " + response));


    }
}

[simon]

hey sry for the big black code block i can't find a edit button for the post but here is a past bin link to the code 

pastbin code link