Help with LiquidCrystal_I2C_Spark library with SparkFun 16x2 LCD and serial backpack

General
2

Here are the helper functions (not a library really) that I use with that product:

void displayHome()
{
    Serial1.write(254); // move cursor to beginning of first line
    Serial1.write(128);
}

void displayMoveTo(int pos)
{
    char posChar;
    if (pos>=1 && pos<=16) {
        posChar = char(128+pos-1);
    } else if (pos>=17 && pos<=32) {
        posChar = char(192+pos-17);
    } else {
        posChar = 128;  // on error, go home
    }
    Serial1.write(254);
    Serial1.write(posChar);
}

void displayClear()
{
    displayHome();
    // clear display fast 32 spaces
    Serial1.write("                "); 
    Serial1.write("                ");
    displayHome();
}

void displayBacklight(int brightpercent)
{
    int mappedBright = map(brightpercent, 0,100,128,157);
    // Make sure range is OK
    if (mappedBright >= 128 && mappedBright <= 157) {
        Serial1.write(124);
        Serial1.write(char(mappedBright));
    }
}