Keybuttons lcd7cape mapped to beaglebone, dont catch event, try eventfilter etc

[RamiroGC]

Hello, it is first time to write here, i have fixed many issue by this forum, but this problem i dont know solution.

I have a beaglebone with lcd7cape, five buttons ( left, right, up, down, enter ), but dont catch events in qt, i try eventfilter, keypressevent, read /dev/input/event2 ( here is event keyboard ), but nothing

By terminal work event, catch key press, running in bbb dont work.

this mainwindow.cpp

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow) , bbwhite(this)
{
ui->setupUi(this);

        QList<QSerialPortInfo> com_ports = QSerialPortInfo::availablePorts();
        QSerialPortInfo port;


        foreach(port, com_ports)
        {
            ui->listWidget->addItem(port.portName());
        }







        bbwhite.setPortName("/dev/ttyO4");

                   bbwhite.open(QSerialPort::ReadWrite);
                   //bbwhite.open(QSerialPort::ReadOnly);
                   bbwhite.setBaudRate(QSerialPort::Baud9600);
                   bbwhite.setDataBits(QSerialPort::Data8);
                   bbwhite.setFlowControl(QSerialPort::NoFlowControl);
                   bbwhite.setParity(QSerialPort::NoParity);
                   bbwhite.setStopBits(QSerialPort::OneStop);



  connect(&bbwhite, SIGNAL(readyRead()), this, SLOT(readData()));


      ui->TipoVia->setText("Via: Ciudad");   //partimos de via ciudad
      mensajesCiudad();

}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::keyPressEvent(QEvent* event)
{
ui->listWidget->insertItem(0,QString::number(1) + " " + "carretera" );

if (event->key() == Qt::Key_Enter)
{

}
}

mainwindow.h

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

protected:
void keyPressEvent(QEvent* event);
//bool eventFilter(QObject* obj, QEvent* event);
.
.
.
.

in other forum read about have my windows with focus, but i dont know , thanks