I connected the ReadyRead-Signal from my SerialPort to the Slot

Qt Code: 
  1. void Serial::handlePortReadyRead(){
  2.     QByteArray temp = serialPort.readAll();
  3.     qDebug()<<"Read from Port" << temp.toHex();
  4.     emit ReadFromPort(temp);
  5. }
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When I start a process I connect the ReadFromPort(QByteArray)-Signal to a Slot, where I handle the repsonse from the port.

Qt Code: 
  1. void Process::analyzeFrame(QByteArray temp){
  2.     for(int charCount = 0; charCount < temp.count(); charCount++){
  3.         char singleInChar = temp.at(charCount);
  4.         validationFlag = handleResponse(&response, deviceAddress, FID, singleInChar, false);
  5.             break;
  6.         }
  7.     }
  8. }
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handleResponse returns 0 or 1. If it returns 1 I want the process to continue, 0 means I have to wait. If validationFlag does not get 1 within 100 msecs the process should stop.

Qt Code: 
  1. serialPort.write(dataToSend);
  2.             TimerForReadingFromPort->start(100);
  3.             do{
  4.                 QApplication::processEvents();
  5.                 if(validationFlag == 1){
  6.                      //analyze response
  7.                      ...
  8.                      response.clear();
  9.                 }
  10.                else if(TimerForReadingFromPort->remainingTime() == 0){
  11.                      ....
  12.                      return
  13.                 }
  14.             }
  15.             while(validationFlag == 0);//end while-Schleife
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So this process is a very long process. Sometimes it get stucked in the middle of the code, I think it is because of the QApplication:rocessEvents().
Is there any better way?