Serial port

McLion

Is your fd the serialport?
Again, as asked before, why are you not using QSerialPort?
What is your target, the task you need to get done?

? Offline

Basic serial port usage as I have worked on is

@ serial=new QSerialPort(this);

serial->setPortName("/dev/ttyS0");
serial->setBaudRate(9600);
serial->setDataBits(QSerialPort::Data8);
serial->setParity(QSerialPort::NoParity);
serial->setFlowControl(QSerialPort::NoFlowControl);


serial->open(QIODevice::ReadWrite);

serial->write("Hello World");

connect(serial,SIGNAL(readyRead()),this,SLOT(readSerialData()));@

McLion

.. and the readSerialData() ... (pseudo code)
@
void QTGUI_MainWindow::readSerialData()
{
while((iBytesAvailable = serial->bytesAvailable()))
{
QByteArray RawPortData = serial->read(iBytesAvailable);
...

@

? Offline

int main(int argc, char *argv[])
{

QCoreApplication a(argc, argv);
fd = open(MODEMDEVICE,O_RDWR|O_NOCTTY);

While(true)

{
Buffer.clear();
nreturn = read(fd,&chBuf,1);
if(nreturn > 0)
{
for(i=0;i<nreturn;i++)
{
Buffer.append(chBuf[i]);

if(chBuf[0] == 0xc9) nReadIndex = 0;

pData[nReadIndex++] = chBuf[i];

qDebug() << "data" << Buffer.toHex();
}
if(chBuf[0] == 0xcf)
{

if(nReadIndex >= 10)

//Display of Gui opreration //

nReadIndex = 0;

}

For this how can i use timers instead of while loop, where should i start timer , i tried but am geting segmentation problem.Please help me

McLion

Your issue seems not to be about the serial port. Please open a new thread for a new topic.

btw: You seem to be very reluctant in using QSerialPort.

? Offline

k .

? Offline

Hi sir,

How to flush the data in serial port without using qextserialport

Please help me sir...

? Offline

hi sir...,
When i use Baud rate B115200...am getting segmentation fault ..in qt...How would i solve the problem..Please help me...

? Offline

hi sir...,
When i use Baud rate B115200...am getting segmentation fault ..in qt...How would i solve the problem..Please help me...

SGaist

Without any proper code, I can't.

SGaist

Without any proper code, I can't.

? Offline

#define BAUDRATE B9600

? Offline

#define BAUDRATE B9600

SGaist

That won't really help debugging but from the looks of it, you are using the linux platform API, so please ask this on a linux dedicated forum.

There's also this "how to":http://www.tldp.org/HOWTO/Serial-Programming-HOWTO/x115.html that should give you some hints and this "stack overflow post":http://stackoverflow.com/questions/6947413/how-to-open-read-and-write-from-serial-port-in-c

SGaist

That won't really help debugging but from the looks of it, you are using the linux platform API, so please ask this on a linux dedicated forum.

There's also this "how to":http://www.tldp.org/HOWTO/Serial-Programming-HOWTO/x115.html that should give you some hints and this "stack overflow post":http://stackoverflow.com/questions/6947413/how-to-open-read-and-write-from-serial-port-in-c