QSerialport with arduino problem

lotin

Hi,
i have a problem with comunication between pc and arduino uno.
I have this code for communicating:
<code>

serial->write(data_char);    
int waitTimeout = 1000;
if (serial->waitForBytesWritten(waitTimeout)) {      
    if (serial->waitForReadyRead(waitTimeout)){
        QByteArray response =  serial->readAll();
        qDebug() << "response" << response;
    } else {
        qDebug() <<"Wait read response timeout %1";
    }
} else {
    qDebug() << "Wait write request timeout %1";
}

</code>
I want to send data and wait until arduino answers.
Ok, it send data and waiting for response, but i getting the actual response and the previous response to.

For example:
I will connect the program with serial port and send first "message" , for example 12, and the first response is ok, i get 12.
But when now i send, for example 78, the response is "1278".
And then when i send for example 3, the response is "783".
.
.
.

I´ve tried lots of possibilities, but nothing were good. Can you help me please. Thank you.

Program in arduino works fine in terminal.

kuzulis

You can try to check it with the Terminal example which comes with the QSerialPort

lotin

Yes, i made this program by the terminal example.

I solve it. I use QStringList to delete the first response.

But, i thank you for for answer.