USB Communication Using Qt

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

dcbasso · wrote on 4 Jul 2012, 19:17

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

franku · wrote on 5 Jul 2012, 20:15

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 · wrote on 5 Jul 2012, 20:22

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?

franku · wrote on 5 Jul 2012, 20:53

The "chips":http://www.ftdichip.com/Drivers/VCP.htm do have drivers for several os. Using your own driver has to supply your own usb VID. Which library you use may depend on the way you want to build it and if you want to use polling or event driven mode to receive data. However, I've used QExtSerialport for Windows and it works fine using a QThread polling the data once a msec.

kuzulis · wrote on 6 Jul 2012, 06:57

bq. My client is using the µC “NXP LPC2366”, I have the driver for him!

I have questions:

NXP LPC2366 It's ARM MCU?
The client uses the "native" serial interface of MCU (USART), or emulation via the USB interface of MCU?
If the emulation, then it serial port correct whether is determined by SerialPortInfo::availablePorts() (QtSerialPort) ? If incorrectly - that let me know.

bq. However, I’ve used QExtSerialport for Windows and it works fine using a QThread polling the data once a msec.

Polling to use threads - this is redundant and inefficient, and I do not believe that you get exactly 1 ms. But this is offtopic.