bool displayChanged;
const int MAXCOLUMN = 2;  // The number of columns in the menus
const int MAXROW[2] = {6,6};  // The maximum number of rows is column-dependent
String line1txt;    // String to be displayed on the LCD's first line
String line2txt;    // String to be displayed on the LCD's second line
int rowcount = 1;   // pointer to the row for display
int colcount = 0;   // pointer to the column for display

void readNavButtons() {
    buttons = lcd.readButtons();
    upBtn  = (buttons & BUTTON_UP) != 0;
    dwnBtn = (buttons & BUTTON_DOWN) != 0;
    lftBtn = (buttons & BUTTON_LEFT) != 0;
    rgtBtn = (buttons & BUTTON_RIGHT) != 0;
    selBtn = (buttons & BUTTON_SELECT) != 0;
}

void selectStatusDisplay(){
    if (buttons) {
        backlightTO = NUMOFSAMPLES;  // use the same "timeout" for both the backlight and the logging
        lcd.setBacklight(ON);
        displayChanged = true;
        if (upBtn) {
            // scroll display towards top of column
            if (rowcount != 0) {
                rowcount -= 1;
            }
        }
        if (dwnBtn) {
            // scroll display towards bottom of column
            if (rowcount != (MAXROW[colcount])-2){
                rowcount += 1;
            }
        }
        if (lftBtn) {
            if (colcount != 0){
                colcount -= 1;
                rowcount = 0;
            }
        }
        if (rgtBtn) {
            if (colcount != (MAXCOLUMN-1)){
                colcount += 1;
                rowcount = 0;
            }
        }
    } else {
      backlightTO -= 1; // Decrement counter if there is no keypress
    }
}

void selectStatusStrings(){
    switch(colcount){
        case 0:
            switch(rowcount){
                case 0:
                    line1txt = "General";
                    line2txt = accuracy1;
                    break;
                case 1:
                    line1txt = accuracy1;
                    line2txt = accuracy2;
                    break;
                case 2:
                    line1txt = accuracy2;
                    line2txt = shldStatus;
                    break;
                case 3:
                    line1txt = shldStatus;
                    line2txt = udpStatus;
                    break;
                case 4:
                    line1txt = udpStatus;
                    line2txt = sdStatus;
                    break;
                default:
                    line1txt = "";
                    line2txt = "";   
            }
            break;
        case 1:
            switch(rowcount){
                case 0:
                    line1txt = "Connection";
                    line2txt = connSSID;
                    break;
                case 1:
                    line1txt = connSSID;
                    line2txt = connIPaddr;
                    break;
                case 2:
                    line1txt = connIPaddr;
                    line2txt = connSS;
                    break;
                case 3:
                    line1txt = connSS;
                    line2txt = dateStringStart;
                    break;
                case 4:
                    line1txt = dateStringStart;
                    line2txt = timeStringStart;
                    break;
                default:
                    line1txt = "";
                    line2txt = "";
            }
            break;
        default:
            line1txt = "";
            line2txt = "";
    }
}

void showStatus(){
    if (displayChanged || firstLoop){
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print(line1txt);
        lcd.setCursor(0,1);
        lcd.print(line2txt);
        displayChanged = false;
    }
}