CODEWITHSUNDEEP
windowsqtqt5
jbrand1
jbrand1

Reputation: 61

QSerialPort Dropping Bytes

I am using QSerialPort to send an receive data in Qt5.5 (windows) and everything works as expected except in one case, when the data sent back contains 0x11. I see this is a special ascii value but would like to read it in as a raw byte. My setup is as follows:

setBaudRate(QSerialPort::Baud115200);
setDataBits(QSerialPort::Data8);
setStopBits(QSerialPort::OneStop);
setFlowControl(QSerialPort::SoftwareControl);
setParity(QSerialPort::NoParity);

Later...

open(QIODevice::ReadWrite);

My reading in a slot connected to readyRead():

buffer_.append(readAll());

where buffer_ is a QByteArray.

An example packet would be:

0xBF 0x00 0x00 0x00 0x00 0x04 0x11 0x00 0x02 0x70

and the packet I would receive:

0xBF 0x00 0x00 0x00 0x00 0x04 0x00 0x02 0x70

Upvotes: 1

Views: 247

Answers (2)

Kamil Klimek
Kamil Klimek

Reputation: 13130

0x11 and 0x13 are flow control bytes in Sofware Flow mode. This is why 0x11 was "dropped". Using NoFlowControl means that you have to control flow by yourself. I.e. you can't write to much data in short time as you will lose it.

Upvotes: 0

jbrand1
jbrand1

Reputation: 61

As per Kamil Klimek I changed to no flow control and it works.

setFlowControl(QSerialPort::NoFlowControl);

Upvotes: 1

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