Maintaining the delay between sending and reading the data

Hai,
In the bellow application am facing the delay problem.

I will explain clearly what my functionality requires--
Using the bellow function i will get the some data from the micro controller using the serial port and i will display that particular data on my GUI.

Initially i will send " : 7 0" code data to the Micro controller,using that code data micro controller will send some data,which i want to read and show on my GUI.

I gave some delay(using dummy for loops) between sending code data(": 7 0") and receiving controller data.
The for loops causes the problem to me,because the delay reduces with the CPU configuration.without delay my application unable to read entire data which i required.

plz assist me to overcome this problem.

one more thing i required is how to take the data on to QBytearray instead of taking on to the buffer,while reading the data.

i desperately need your suggestions.

Thanx alot.

Code:

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void Synth1::get()                               // recieving synth lock detects from RC
{
    port->open(QIODevice::ReadWrite);
	port->write(QString::QString(":").toAscii());
     for(long int i=0;i<=10000000;i++);
     port->write(QString::QString(" ").toAscii());
     port->write(QString::number(7).toAscii());
     port->write(QString::QString(" ").toAscii());
     for(long int i=0;i<=10000000;i++);
     for(long int i=0;i<=10000000;i++);
     port->write(QString::number(0).toAscii());
     port->write(QString::QString(" ").toAscii());
 
     for(long int i=0;i<=100000000;i++);
     for(long int i=0;i<=100000000;i++);
     for(long int i=0;i<=100000000;i++);
     for(long int i=0;i<=100000000;i++);
     for(long int i=0;i<=100000000;i++);
     for(long int i=0;i<=100000000;i++);
     for(long int i=0;i<=100000000;i++);
     for(long int i=0;i<=100000000;i++);
    char buff[2048];
  	int numBytes;
    numBytes = port->bytesAvailable();
	if(numBytes > 0) 
	{
	  if(numBytes > 2048) 
	    numBytes = 2048;
	    int i = port->read(buff, numBytes);
	    buff[i] = '\0';
	    QString msg = buff;
	    QString y = ": 7 ";
	    int j=msg.indexOf(y,0);
	    msg.remove(0,j);
	    ui.lineEdit_13->clear();
	    ui.lineEdit_13->insert(msg);
	    QStringList fields =msg.split(" ");
		if(fields.size()==16)
		{
		QString str,id2,sum2,sy1,sy2,sy3,sy4,sy5,sy6,sy7,sy8,sy9,sy10,sy11,sy12;
         str=fields[0];
         id2=fields[1];
         sum2=fields[2];
         sy1=fields[3];
		 sy2=fields[4];
		 sy3=fields[5];
		 sy4=fields[6];
		 sy5=fields[7];
		 sy6=fields[8];
		 sy7=fields[9];
		 sy8=fields[10];
		 sy9=fields[11];
		 sy10=fields[12];
		 sy11=fields[13];
		 sy12=fields[14];
		 if(id2=="7")
		 {
		 ui.lineEdit->clear();
		 ui.lineEdit_2->clear();
		 ui.lineEdit_3->clear();
		 ui.lineEdit_4->clear();
		 ui.lineEdit_5->clear();
         ui.lineEdit_6->clear();
		 ui.lineEdit_7->clear();
		 ui.lineEdit_8->clear();
		 ui.lineEdit_9->clear();
		 ui.lineEdit_10->clear();
		 ui.lineEdit_11->clear();
		 ui.lineEdit_12->clear();
		 ui.lineEdit->insert(sy1);
         ui.lineEdit_2->insert(sy2); 
         ui.lineEdit_3->insert(sy3); 
         ui.lineEdit_4->insert(sy4); 
         ui.lineEdit_5->insert(sy5); 
         ui.lineEdit_6->insert(sy6); 
         ui.lineEdit_7->insert(sy7); 
         ui.lineEdit_8->insert(sy8);
         ui.lineEdit_9->insert(sy9);
         ui.lineEdit_10->insert(sy10);
         ui.lineEdit_11->insert(sy11);
         ui.lineEdit_12->insert(sy12);
         }
         else
         {
         QMessageBox:: about(this,tr("PORT"),
           tr("<b>NOT VALID PACKET</b> recieved..."));
         }
         }
         else
		{
			QMessageBox:: about(this,tr("PORT"),
           tr("<b>DATA</b>  NOT recieved properly."));
		}
	}
 
}

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Quote:

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The for loops causes the problem to me,because the delay reduces with the CPU configuration.without delay my application unable to read entire data which i required.

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What do you mean delay reduces the CPU configuration. I do not understand what do you want to say.

Quote:

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Originally Posted by jjbabu

Code:

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for(long int i=0;i<=100000000;i++);
for(long int i=0;i<=100000000;i++);
for(long int i=0;i<=100000000;i++);
for(long int i=0;i<=100000000;i++);
for(long int i=0;i<=100000000;i++);
for(long int i=0;i<=100000000;i++);
for(long int i=0;i<=100000000;i++);
for(long int i=0;i<=100000000;i++);

---

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You shouldn't block GUI applications' event loop with busy loops like these. You should use for example QTimer to schedule a slot to be called at certain delay. This makes it possible for the application to process its events meanwhile.

Or better, you can read data on its own thread.