[Qt-interest] serial communication, RTS and DTR

[Denis Akhmetzyanov]

Hi,
Are you open port before setRts() ?

    serial->open(QIODevice::ReadWrite)


2010/3/30 HardMaker <hardmaker at gmail.com>

> Hi,
> I'm trying to make a serial comunication too and I need to control the
> RTS and DTR lines. Not for make a hardware hand shaking, yust I wan't to
> drive this lines and send and recive data trow the serial port as
> diferents things.
> As you suggest, I try QextSerialPort from google and use this code on
> linux to initialize the port:
>
>    QextSerialPort serial = new QextSerialPort();
>    serial->setBaudRate(BAUD9600);
>    serial->setFlowControl(FLOW_OFF);
>    serial->setParity(PAR_NONE);
>    serial->setDataBits(DATA_8);
>    serial->setStopBits(STOP_2);
>
> but when I press a button to execute this code:
>
>  serial->setRts(true);
> or
>  serial->setRts(false);
>
> Nothing happend, I'm using a digital voltimeter conected to RTS and
> don't change. But, if use other applications  it's ok  (the hardware work).
> Can helpme?
>
> Thank's
>
> Sergio
>
> Yuvraj escribió:
> > Denis Akhmetzyanov wrote:
> >
> >> Hi,
> >> I suggest you to try
> >> QextSerialPort http://code.google.com/p/qextserialport/ instead of the
> >> native calls. It is a convenient class implements QIODevice and
> >> supports signal/slot technology and asynchronous calls.
> >>
> >>
> >> 2010/3/30 Yuvraj <yuvraj.ragupathi at indieontech.com
> >> <mailto:yuvraj.ragupathi at indieontech.com>>
> >>
> >>      Hi ,
> >>
> >>     Here i am opening the serial communication device file and writing
> >>     some data, in other hand i am not getting the data due to enter
> >>     key( "/r/n")
> >>
> >>     my code is
> >>
> >>      file_descriptor = open("/dev/ttyS0",O_RDWR);
> >>         if(file_descriptor > 0)
> >>         {
> >>              timer = new QTimer;
> >>             timer1 =new QTimer;
> >>
> >>
> QObject::connect(timer,SIGNAL(timeout()),this,SLOT(browser_append()));
> >>
> >>
> QObject::connect(timer1,SIGNAL(timeout()),this,SLOT(on_send_clicked()));
> >>             timer->start(1);
> >>             timer1->start(10);
> >>         }
> >>         else
> >>         {
> >>             QMessageBox::information(0,"","Connection failed");
> >>         }
> >>
> >>
> >>     void  window::on_send_clicked()
> >>     {
> >>          int file_id;
> >>        char send_data[150]= "Hi Hello\r\n";
> >>         if(file_descriptor > 0)
> >>         {
> >>            file_id= write(file_descriptor,send_data,15);
> >>            ui->send_text->clear();
> >>            ui->send_text->setFocus();
> >>            if(file_id > 0)
> >>            {
> >>                qDebug()<<"Data successfully written \n";
> >>            }
> >>
> >>
> >>         }
> >>
> >>     }
> >>
> >>     any  ideas?
> >>
> >>     Thanks
> >>
> >>     Yuvaraj R
> >>
> >>
> >>     _______________________________________________
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> >>     http://lists.trolltech.com/mailman/listinfo/qt-interest
> >>
> >>
> >>
> > There itself i am facing  same issue (key enter )
> >
> > Thanks
> > Yuvaraj
> > _______________________________________________
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> > Qt-interest at trolltech.com
> > http://lists.trolltech.com/mailman/listinfo/qt-interest
> >
> >
>
>
>
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