USB Communication Using Qt

Candiman

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

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

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

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

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

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

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

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

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

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

kuzulis

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

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

dcbasso

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

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

dcbasso

I'm still having the same problems:

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

kuzulis

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

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

dcbasso

Well... I will try once again...
Thanks anyway!

franku

You may want to have a look at "libusb-win32":http://sourceforge.net/apps/trac/libusb-win32/wiki. It depens wether you are using ftdi chips for the µC side, or want to build your usb-client on the controller yourself. For attaching a device very simple try to use the ftdi232 with either vcp or d2xx usage. I.e. "ftdi-link":http://www.ftdichip.com/Products/ICs/FT231X.html
.. frank

dcbasso

My client is using the µC "NXP LPC2366", I have the driver for him!
I need to build a app which will run at on windows, linux and Mac OS.

That the way I'm trying to use the QtSerialPort!

I'm doing something wrong in the conception off app?