qml qt freeze at the time of cpp funtion call

[Anas_Deshmukh]

my test application get freeze when i call cpp function, as function finishes everything work fine,, i need to call same cpp function repeatedly.

sm20.h

#ifndef SM20_H
#define SM20_H

#include <QObject>
#include <QDateTime>
#include <QFile>
#include <QtGui>
#include <QtCore>
#include <QTimer>

class SM20: public QThread
{
Q_OBJECT
public :
void set_up();
public slots :
void testSm20();
};
#endif // SM20_H

main.cpp

#include "qtquick1applicationviewer.h"
#include <QApplication>
#include "sm20.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QtQuick1ApplicationViewer viewer;
viewer.addImportPath(QLatin1String("modules"));
viewer.setOrientation(QtQuick1ApplicationViewer::ScreenOrientationAuto);
viewer.setMainQmlFile(QLatin1String("qrc:/main.qml"));
viewer.showExpanded();

SM20 sm20;
//sm20.testSm20();

QObject *object = viewer.rootObject();
QObject::connect(object, SIGNAL(mySignal()), &sm20, SLOT(testSm20()));
return app.exec();
}

sm20.cpp

#include <QApplication>
#include <QTimer>
#include "FP.h"
#include "sm20.h"

void SM20 :: set_up()
{
setUp();
}

void SM20 :: testSm20()
{
setUp();
qDebug () << "inside test\n";
ledOn();
ledOff();
ledOn();
ledOff();
}

main.qml

import QtQuick 1.1

Rectangle {
width: 480
height: 270
signal mySignal()
Item {
Timer {
interval: 10000; running: true; repeat: true
onTriggered: mySignal()
}
}
}

[Anas_Deshmukh]

my program freeze at the time of testSm20().
help me to rid of this issue.

[jsulm]

First question: why does SM20 inherit from QThread?
You don't implement void run() method.
Are you trying to execute void testSm20() in a separate thread? If so then you're doing it wrong.

What does setUp() do?
What is in ledOn()?