USB Communication Using Qt

Alicemirror · wrote on 29 Jun 2011, 15:52

@all

Hi, I have found this thread because I have a similar problem.

I have to communicate with a serial external device folowing a simple yet precise protocol. I have tried a fast test to develop the protocol using RXTCComm java library that works not so good and now I was searching for a Qt approach that is the final goal of the other side of the device.

I try to put all your advices together and see if a working stuff can be done. If it maybe useful I put the project on the project area so who is interested can follow. As the project is ready and setup it will be on projects.forum.nokia.com/mill-machine I will announce it on t the forum appropriate area and in the Qt embedded group.

Cheers.

Anticipating many thanks to all.

Candiman · wrote on 30 Jun 2011, 01:47

Great. Tnx Alicemirror.

dan_geo · wrote on 28 Dec 2011, 17:49

Hi. I have used rs232 communication in visual c++ 6.0
which work very well. But because of my problem with
transmit images trough socket in VC++ which is
too complicated than Qt implementation ( very simple ).
I need to implement rs232 comunication.
My interface have to use TCP socket for internet comunication and rs232 for comunicate with microcontroller
and electrical devices.

Candiman · wrote on 31 Dec 2011, 06:10

Hi dan_geo, let me know if you get your RS232 comms working with Qt. I have had to shift focus to a different project but during the downtime over the December holidays and from Jan 2012 I will be putting effort into the USB via Qt project again since many of my projects can benefit from having a GUI that I can design with Qt. I decided not to go with the RS232 option because so many PCs these days don't have a serial port. USB to serial converters are cheap, but if I can communicate directly with my device using USB then I don't need any additional hardware / drivers etc.
Good luck!

dan_geo · wrote on 31 Dec 2011, 08:17

I have not get rs232 comm. Next days i will try to
implement them in Qt. If you are a source, please
sent to me. About usb, this task i will do later
with PIC18F4455. At usb i understand that
for make a host usb is more complicated than
implement a usb client for example a controller.

dcbasso · wrote on 3 Jul 2012, 12:56

What its the best to access USB port:

http://doc.qt.nokia.com/qtextended4.4/qserialport.html

http://code.google.com/p/qextserialport/

http://qt-apps.org/content/show.php/QSerialDevice?content=112039 (Updated)

Thanks.

koahnig · wrote on 3 Jul 2012, 13:29

According to "this post":http://qt-project.org/forums/viewthread/15580/#90074 there is a wiki on "QtSerialPort":http://qt-project.org/wiki/QtSerialPort Apparently, the source is inherited from QSerialDevice.

dcbasso · wrote on 4 Jul 2012, 13:05

It's possible to use the QtSerialPort on QT4? On this page (see: http://qt-project.org/wiki/Building-Qt-5-from-Git#15e7b6ad3df43ff719f8388ab4afb1cc) show thats is possible but he only explains to build in qt5!

Anyone is using on QT4? The example there show only to build on Windows, not on linux...

dcbasso · wrote on 4 Jul 2012, 13:49

Well, I compile using QT Creator 4.8.1, now I copy the compile folder "QtAddOnSerialPort" to directory:

"../bin/QtSDK/Desktop/Qt/4.8.1/gcc/include/."

This will be enough to work with SerialPort/USB on QT?

Thanks all!

kuzulis · wrote on 4 Jul 2012, 14:07

Possible.

Build and install process:


bq. $mkdir serialport-build
$cd  serialport-build
$qmake ../qtserialport/serialport.pro
$make (or nmake)
$make install (or nmake install)

Note: But in Windows, this build and install only the Debug version. To build and install Release version - just repeat the steps again, with:

bq. $qmake ../qtserialport/serialport.pro CONFIG+=release


use:
~~~

your custom *.pro file:

bq. CONFIG += serialport

your *.cpp file:

@#include <QtAddOnSerialPort/serialport.h>
#include <QtAddOnSerialPort/serialportinfo.h>
 
QT_USE_NAMESPACE_SERIALPORT@

dcbasso · wrote on 4 Jul 2012, 14:32

hi kuzulis, from QtCreator I build and appears to works fine... Doing the make as you said give me an error...
I have already copy and past the folder "QtAddOnSerialPorta" to “../bin/QtSDK/Desktop/Qt/4.8.1/gcc/include/.” and QtCreator find the includes:

@
#include <QtAddOnSerialPort/serialport.h>
#include <QtAddOnSerialPort/serialportinfo.h
@

I'm trying to run the example on that page but doesn't works.... the errors:

"Undefined reference to 'QtAddOn::SerialPort::SerialPortInfo::avaliablePorts()'"
... (more others 14 similar erros)

dcbasso · wrote on 4 Jul 2012, 14:47

Sorry I made some mistake:

When I try to compile on Qt using 4.6.1 or using the make on shell It gives me this error:

moc_serialport.cpp:55:16: error: ‘SerialPort’ was not declared in this scope

On the QT 4.8.1 the Qt Creator gives the message:
...
#error (moc changes too much)
...

dcbasso · wrote on 4 Jul 2012, 14:54

I try again, reopening the project and now works... but now I'm very confused!

kuzulis · wrote on 4 Jul 2012, 15:18

Remove (clear) away all that you previously copied by hand and do as I have indicated in the "above":http://qt-project.org/forums/viewreply/90605/

dcbasso · wrote on 4 Jul 2012, 16:35

Will not compile... the errors at code...

dcbasso · wrote on 4 Jul 2012, 16:39

See the errors:

@
...
...
...
/home/dvl/SOURCE_CODE/qtserialport/src -I/usr/include/QtCore -I/usr/include/QtGui -I/usr/include -I/home/dvl/SOURCE_CODE/qtserialport/src -I. -I/home/dvl/SOURCE_CODE/qtserialport/src -I. -o moc_serialport.o moc_serialport.cpp
moc_serialport.cpp:55:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:56:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:57:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:58:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:59:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:60:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:61:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:62:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:63:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:64:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:65:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:66:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:67:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:68:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:69:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:70:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:71:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:72:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:73:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:74:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:75:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:76:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:77:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:78:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:79:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:80:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:81:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:82:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:83:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:84:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:85:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:86:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:87:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:88:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:89:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:90:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:91:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:92:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:93:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:94:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:95:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:96:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:97:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:98:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:99:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:100:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:101:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:102:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:103:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:104:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:105:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:106:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:107:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:108:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:109:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:110:16: error: ‘SerialPort’ was not declared in this scope
moc_serialport.cpp:142:19: error: ‘SerialPort’ has not been declared
moc_serialport.cpp:151:20: error: ‘SerialPort’ has not been declared
moc_serialport.cpp:151:45: error: non-member function ‘const QMetaObject* metaObject()’ cannot have cv-qualifier
/usr/include/QtCore/qobject.h: In function ‘const QMetaObject* metaObject()’:
/usr/include/QtCore/qobject.h:296:33: error: ‘QScopedPointer<QObjectData> QObject::d_ptr’ is protected
...
...
...
@

dcbasso · wrote on 4 Jul 2012, 17:58

Fixed... Compiled in manual way... testing...

dcbasso · wrote on 4 Jul 2012, 18:00

I'm still having the same problems:

“Undefined reference to ‘QtAddOn::SerialPort::SerialPortInfo::avaliablePorts()’”
....
...

kuzulis · wrote on 4 Jul 2012, 19:09

I do not know what you did - but I have everything working well.

1.To start, try to remove all the headers, libraries, etc. QtSerialPort of the your *nix OS.
2. Download the latest version of the library
3. Build and install library to the system step-by-step, see an new updated manual in the Wiki.
4. Create a new blank project and include the library as stated in the Wiki

More anything, I can not help you, because I can not control all of your "curves" action.

dcbasso · wrote on 4 Jul 2012, 19:11

Sorry guys... to many posts here about this problem but:

Now I got another error:

#include "qglobal.h"
"qglobal.h not such file or directory

I post it before you answer me kuzulis