Qt Serial Port Tutorial
The Qt Serial Port module provides the following examples for reference to help understand the API usage. Running the Examples. To run the examples from Qt Creator, open the Welcome mode and select the example from Examples. Using serial port in QT. I am using Evaluation board with Col VF61. I followed this tutorial to download and install the qt toolchain and sdk. I then installed the qt demo image on Col VF61 and was able to run the hello world qt application on VF61. Qt 5.1 already include Serial class that can use to communicate Qt with another application through serial port. This Video is simply tutorial how to use serial class in console application. Terminal shows how to create a terminal for a simple serial interface by using Qt Serial Port. This example shows the main features of the QSerialPort class, like configuration, I/O implementation and so forth. Also, the class QSerialPortInfo is invoked to display information about the serial ports.
Is there any serial port facilities in Qt ?
If not, which crossplatform (desirable) libraries (for working with serial port and, maybe, with other I/O ports), do you recommend ?
lpappclosed as not constructive by casperOneJul 17 '12 at 13:37
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3 Answers
Frank BollackFrank BollackWell, there's always Boost.
In Boost there is a great Async I/O library called ASIO. It can perform operations in all sorts of endpoints, including serial ports.
There is a great example about how to build a minicom-like application using Boost::Asio, that you can use to see if ASIO will attend your needs.
Since boost works on all platforms/compilers under the sun, the cross platform requirement can be checked.
Cheers.
Edu FelipeEdu Felipe
Here is a Qt serial library, works on Win, WinCE, Linux (i386 and ARM), Mac..
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Also, it is based on QIODevice for a native feel, with it you can, if you like, direct serial communication onto TCPIP with little no no effort.
It is LGPL also.. enjoy.
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I have this simple code that use QtSerialPort:
The result on my serial is {2, 50}. I think that che biggest number that I can send is 128 (char go from -128 to 128). Where is the manner for send number from 0 to 255? I try to use unsigned char but the method 'write' don't work with it. The same problem also appear with QByteArray.
Thankyou all.
Qt Serial Port Read
Maxim MakhunQt Serial Port Tutorial Wave
2 Answers
The QIODevice interface has the default char for sending which may be compiler dependent. See the documentation for details.
qint64 QIODevice::write(const char * data, qint64 maxSize)
Writes at most maxSize bytes of data from data to the device. Returns the number of bytes that were actually written, or -1 if an error occurred.
However, you should not be concerned much if you take the data properly on the other hand. you can still send the greater than 128 values through as signed, but they will come across as negative values, for instance 0xFF will be -1.
If you take the same logic in the reverse order on the receiving end, there should be no problems about it.
However, this does not seem to relate to your issue because you do not get the corresponding negative value for 130, but you get it chopped at 7 bits. Make sure you connection is 8 data bit.
You can set that explicitly after opening the port with this code:
lpapplpappMake sure you've set the serial port to send 8 bits, using QSerialPort::DataBits
The fact that '130' is coming as '2' implies that the most significant bit is being truncated.
ChrisWChrisW