1

this is my code : (I used qextserialport) 

SerialPort::SerialPort(QString port)
{
    sp=new QextSerialPort;
    sp->setPortName(port);
    /*port->setBaudRate(BAUD9600);
    port->setFlowControl(FLOW_OFF);
    port->setParity(PAR_NONE);
    port->setDataBits(DATA_8);
    port->setStopBits(STOP_2);*/
    sp->setBaudRate(BAUD115200);
    sp->setDataBits(DATA_8);
    sp->setFlowControl(FLOW_OFF);
    sp->setParity(PAR_NONE);
    sp->setStopBits(STOP_1);
    sp->open(QIODevice::ReadWrite);
    connect(sp,SIGNAL(readyRead()),this,SLOT(ReadData()));

}

void SerialPort::ReadData()
{
    QByteArray ba;
    ba.resize(512);
    ba=sp->readAll();
    emit DataRecieve(ba);
}

this code run on Ubuntu at first and show all the bytes which receive from device, but when I tested it in linux embedded device this code read data from serial device in 2 part. () there is no \n in my bytes. I change the code to this code : 

void SerialPort::ReadData()
{
    QByteArray ba;
    ba.resize(512);
    if(sp->bytesAvailable()>0 || sp->waitForReadyRead(20000))
    {
    qDebug()<<sp->bytesAvailable();
    ba=sp->readAll();
    qDebug()<<ba.toHex();
    emit DataRecieve(ba);
    }
}

but again my output is : 

4 "aa5524010400000000000000"   
12 "000000000000000000002801"

but it should be : 

"aa5524010400000000000000000000000000000000002801"

My output size is maybe 48 bytes or 512 bytes

H.Ghassami
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1 Answers1

1

It depends on serial port driver buffer. You can got readyRead() signal on one ready byte, for example. You should save received bytes to intermediate buffer and process it after all.

Edward
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