QespTest.cpp Example File

    /* QespTest.cpp
    **************************************/
    #include "QespTest.h"
    #include "qextserialport.h"
    #include <QLayout>
    #include <QLineEdit>
    #include <QTextEdit>
    #include <QPushButton>
    #include <QSpinBox>

    QespTest::QespTest(QWidget *parent)
        : QWidget(parent)

    {
        //modify the port settings on your own
    #ifdef Q_OS_UNIX
        port = new QextSerialPort(QLatin1String("/dev/ttyS0"), QextSerialPort::Polling);
    #else
        port = new QextSerialPort(QLatin1String("COM1"), QextSerialPort::Polling);
    #endif /*Q_OS_UNIX*/
        port->setBaudRate(BAUD19200);
        port->setFlowControl(FLOW_OFF);
        port->setParity(PAR_NONE);
        port->setDataBits(DATA_8);
        port->setStopBits(STOP_2);
        //set timeouts to 500 ms
        port->setTimeout(500);

        message = new QLineEdit(this);

        // transmit receive
        QPushButton *transmitButton = new QPushButton(tr("Transmit"));
        connect(transmitButton, SIGNAL(clicked()), SLOT(transmitMsg()));
        QPushButton *receiveButton = new QPushButton(tr("Receive"));
        connect(receiveButton, SIGNAL(clicked()), SLOT(receiveMsg()));
        QHBoxLayout *trLayout = new QHBoxLayout;
        trLayout->addWidget(transmitButton);
        trLayout->addWidget(receiveButton);

        //CR LF
        QPushButton *CRButton = new QPushButton(tr("CR"));
        connect(CRButton, SIGNAL(clicked()), SLOT(appendCR()));
        QPushButton *LFButton = new QPushButton(tr("LF"));
        connect(LFButton, SIGNAL(clicked()), SLOT(appendLF()));
        QHBoxLayout *crlfLayout = new QHBoxLayout;
        crlfLayout->addWidget(CRButton);
        crlfLayout->addWidget(LFButton);

        //open close
        QPushButton *openButton = new QPushButton(tr("Open"));
        connect(openButton, SIGNAL(clicked()), SLOT(openPort()));
        QPushButton *closeButton = new QPushButton(tr("Close"));
        connect(closeButton, SIGNAL(clicked()), SLOT(closePort()));
        QHBoxLayout *ocLayout = new QHBoxLayout;
        ocLayout->addWidget(openButton);
        ocLayout->addWidget(closeButton);

        received_msg = new QTextEdit();

        QVBoxLayout *myVBox = new QVBoxLayout;
        myVBox->addWidget(message);
        myVBox->addLayout(crlfLayout);
        myVBox->addLayout(trLayout);
        myVBox->addLayout(ocLayout);
        myVBox->addWidget(received_msg);
        setLayout(myVBox);

        qDebug("isOpen : %d", port->isOpen());
    }

    QespTest::~QespTest()
    {
        delete port;
        port = NULL;
    }

    void QespTest::transmitMsg()
    {
        int i = port->write(message->text().toLatin1());
        qDebug("trasmitted : %d", i);
    }

    void QespTest::receiveMsg()
    {
        char buff[1024];
        int numBytes;

        numBytes = port->bytesAvailable();
        if(numBytes > 1024)
            numBytes = 1024;

        int i = port->read(buff, numBytes);
        if (i != -1)
            buff[i] = '\0';
        else
            buff[0] = '\0';
        QString msg = QLatin1String(buff);

        received_msg->append(msg);
        received_msg->ensureCursorVisible();
        qDebug("bytes available: %d", numBytes);
        qDebug("received: %d", i);
    }

    void QespTest::appendCR()
    {
        message->insert(QLatin1String("\x0D"));
    }

    void QespTest::appendLF()
    {
        message->insert(QLatin1String("\x0A"));
    }

    void QespTest::closePort()
    {
        port->close();
        qDebug("is open: %d", port->isOpen());
    }

    void QespTest::openPort()
    {
        port->open(QIODevice::ReadWrite | QIODevice::Unbuffered);
        qDebug("is open: %d", port->isOpen());
    }