write data using QextSerialPort is writing 0 bytes always

[prasad_N]

Hi, I am trying to send 1/0 to my ARDUINO Board & trying to receive some data from board as a response , I am using QextSerialPort for this But I am not able to write any data to the board & not able to receive any data also.

http://docs.qextserialport.googlecode.com/git/1.2/qextserialport.html

qDebug() << "send.size() : " << send.size() << " data = " << send.data() <<" Written = " << port->write(send, send.size());
This printing : send.size() : 1 data = 1 Written = 0 //Means I am writing 0 bytes every time

Is there a problem in my code ??

void MainWindow::ledOnOff(bool on)
{
    if(port == 0)
    {
        port = new QextSerialPort("COM6", QextSerialPort::EventDriven);     //QextSerialPort* port  is class member 
        port->setBaudRate(BAUD9600);
        port->setFlowControl(FLOW_OFF);
        port->setParity(PAR_NONE);
        port->setDataBits(DATA_8);
        port->setStopBits(STOP_2);
 
        connect(port, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
 
        if(port->open(QIODevice::ReadWrite) == true)
        {
            qDebug() << "Port open success";
        }
        else
        {
            qDebug() << "Port open success";
        }
    }
    else
    {
        port->close();
    }
 
    quint8 writeByte = 0;
 
    if(on)
    {
        writeByte = 1;
    }
 
    if(port->isOpen() || port->open(QIODevice::ReadWrite) == true)
    {
        QByteArray send;
        send.resize(writeByte );
        send = QByteArray::number(writeByte);
 
        port->flush();
        qDebug() << "send.size() : " << send.size() << "  data = " << send.data()
                 <<"  Writtend = " <<  port->write(send, send.size());
    }
    else
    {
        qDebug() << "device failed to open:" << port->errorString();
    }
}
 
 
void MainWindow::onReadyRead()
{
    QByteArray bytes;
    quint8 a = port->bytesAvailable();
    bytes.resize(a);
    port->read(bytes.data(), bytes.size());
 
    qDebug() <<  bytes.constData();
}

void MainWindow::ledOnOff(bool on)
{
    if(port == 0)
    {
        port = new QextSerialPort("COM6", QextSerialPort::EventDriven);     //QextSerialPort* port  is class member 
        port->setBaudRate(BAUD9600);
        port->setFlowControl(FLOW_OFF);
        port->setParity(PAR_NONE);
        port->setDataBits(DATA_8);
        port->setStopBits(STOP_2);

        connect(port, SIGNAL(readyRead()), this, SLOT(onReadyRead()));

        if(port->open(QIODevice::ReadWrite) == true)
        {
            qDebug() << "Port open success";
        }
        else
        {
            qDebug() << "Port open success";
        }
    }
    else
    {
        port->close();
    }

    quint8 writeByte = 0;
    
    if(on)
    {
        writeByte = 1;
    }
    
    if(port->isOpen() || port->open(QIODevice::ReadWrite) == true)
    {
        QByteArray send;
        send.resize(writeByte );
        send = QByteArray::number(writeByte);

        port->flush();
        qDebug() << "send.size() : " << send.size() << "  data = " << send.data()
                 <<"  Writtend = " <<  port->write(send, send.size());
    }
    else
    {
        qDebug() << "device failed to open:" << port->errorString();
    }
}


void MainWindow::onReadyRead()
{
    QByteArray bytes;
    quint8 a = port->bytesAvailable();
    bytes.resize(a);
    port->read(bytes.data(), bytes.size());
    
    qDebug() <<  bytes.constData();
}

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Thanks In Advance.

[prasad_N]

Moved to QSerialPort. Working now

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow), Serial(NULL)
{
    ui->setupUi(this);
    connect(ui->ledBut, SIGNAL(clicked(bool)), this, SLOT(ledOnOff(bool)));
    setup();
}
 
MainWindow::~MainWindow()
{
    delete ui;
    Serial->close();
    delete Serial;
    Serial = NULL;
}
 
void MainWindow::ledOnOff(bool on)
{
    int write = -1;
 
    if(on)
    {
        write = 1;
        ui->ledBut->setText("OFF");
    }
    else
    {
        write = 0;
        ui->ledBut->setText("OFF");
    }
 
    if(Serial->isOpen() ||  this->Serial->open(QIODevice::ReadWrite))
    {
        this->Serial->setBaudRate(QSerialPort::Baud9600);
        this->Serial->setParity(QSerialPort::NoParity);
        this->Serial->setStopBits(QSerialPort::OneStop);
        this->Serial->setFlowControl(QSerialPort::NoFlowControl);
        this->Serial->setDataBits(QSerialPort::Data8);
 
        QByteArray dayArray;
        dayArray[0]= write;
        qDebug() << "Written Bytes : " <<  this->Serial->write(dayArray);
        this->Serial->waitForBytesWritten(-1);
    }
    else
    {
        qDebug() << "Failled open com port";
    }
}
 
void MainWindow::onReadyRead()
{
    QByteArray bytes;
    int a =  Serial->bytesAvailable();
    bytes.resize(a);
    Serial->read(bytes.data(), bytes.size());
    qDebug() << "bytes read:" << bytes.size() << "  Written data = " << bytes.data();
}
 
void MainWindow::errorReport(QSerialPort::SerialPortError error)
{
 if(error!=0)
     qDebug()<<"ERROR:"<<endl<<error;
}
 
void MainWindow::setup()
{
    if(!Serial)
    {
        this->Serial=new QSerialPort(this);
        this->Serial->setPortName("COM6");
        this->Serial->setBaudRate(QSerialPort::Baud9600);
        connect(this->Serial,SIGNAL(error(QSerialPort::SerialPortError)),this,SLOT(errorReport(QSerialPort::SerialPortError)));
        connect(Serial, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
    }
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow), Serial(NULL)
{
    ui->setupUi(this);
    connect(ui->ledBut, SIGNAL(clicked(bool)), this, SLOT(ledOnOff(bool)));
    setup();
}

MainWindow::~MainWindow()
{
    delete ui;
    Serial->close();
    delete Serial;
    Serial = NULL;
}

void MainWindow::ledOnOff(bool on)
{
    int write = -1;

    if(on)
    {
        write = 1;
        ui->ledBut->setText("OFF");
    }
    else
    {
        write = 0;
        ui->ledBut->setText("OFF");
    }

    if(Serial->isOpen() ||  this->Serial->open(QIODevice::ReadWrite))
    {
        this->Serial->setBaudRate(QSerialPort::Baud9600);
        this->Serial->setParity(QSerialPort::NoParity);
        this->Serial->setStopBits(QSerialPort::OneStop);
        this->Serial->setFlowControl(QSerialPort::NoFlowControl);
        this->Serial->setDataBits(QSerialPort::Data8);

        QByteArray dayArray;
        dayArray[0]= write;
        qDebug() << "Written Bytes : " <<  this->Serial->write(dayArray);
        this->Serial->waitForBytesWritten(-1);
    }
    else
    {
        qDebug() << "Failled open com port";
    }
}

void MainWindow::onReadyRead()
{
    QByteArray bytes;
    int a =  Serial->bytesAvailable();
    bytes.resize(a);
    Serial->read(bytes.data(), bytes.size());
    qDebug() << "bytes read:" << bytes.size() << "  Written data = " << bytes.data();
}

void MainWindow::errorReport(QSerialPort::SerialPortError error)
{
 if(error!=0)
     qDebug()<<"ERROR:"<<endl<<error;
}

void MainWindow::setup()
{
    if(!Serial)
    {
        this->Serial=new QSerialPort(this);
        this->Serial->setPortName("COM6");
        this->Serial->setBaudRate(QSerialPort::Baud9600);
        connect(this->Serial,SIGNAL(error(QSerialPort::SerialPortError)),this,SLOT(errorReport(QSerialPort::SerialPortError)));
        connect(Serial, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
    }
}

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