Questions tagged [qt]
a cross-platform application framework for developing application software
51
questions with no upvoted or accepted answers
3
votes
1
answer
62
views
magnetic field generated by the engine alternator affects gpio value
I am working on a dashboard for a motorcycle. I created a Qt application on my raspberry pi 4 on a raspberry pi os lite.
I have configured one of my GPIO as interrupt using the wiringPi library.
...
- 357
3
votes
0
answers
631
views
QML without X11
Is it possible to run QML files without X_Desktop environment in raspbian Jessie for Raspberry Pi3?
I found this tutorial: EGLFS , but I would prefer if it is possible to compile directly on RPi, ...
- 41
2
votes
0
answers
281
views
OpenCV cross-compilation fails
I have cross-compiled Qt on my CentOS host for my Raspberry Pi and now I want to cross-compile OpenCV with the following script:
CORES=4
IP=192.168.178.52
TEMP_PATH=/home/kampi/OpenCV
SYSROOT_PATH=/...
- 203
2
votes
0
answers
2k
views
Why GLX or EGL is not enabled when running QT program?
To start with I have to say I was trying to make cross-compilation work for Ubuntu with Raspberry Pi 3+ B. I used this tutorial https://wiki.qt.io/RaspberryPi2EGLFS and QT in version 5.12.4. Tried it ...
- 21
2
votes
1
answer
61
views
Compile Qt application on Raspberry Pi and Run that application on other ARM device. Will it work?
I am compiling One Qt application on Raspberry Pi and Run it on different ARM device like Microchip or TI board without compile again. will it work??? if both the side Qt version is same.
- 31
2
votes
0
answers
686
views
Qt cross compilation *QOpenGLShaderProgram: could not create shader program* error
I am using the QT Creator for my laptop (Linux LMDE 3 Cindy OS) And for Raspberry Zero Cross-compiling.
I have installed the QT based of this instruction and by this setting:
mkdir ~/raspi
...
- 189
2
votes
0
answers
1k
views
Latest Qt5 does not provide EGLFS during cross-compilation
Some time ago I set up a Linux host to cross-compile Qt5. I used this configure command:
./configure -release -opengl es2 -device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=~/opt/tools/arm-...
- 517
2
votes
0
answers
2k
views
Live Camera App with Qt
I am trying to write an application using Qt that displays live video from the Pi camera. The Qt example projects "camera" (using QWidgets) and "declarative-camera" (using QML) both run without ...
- 21
2
votes
1
answer
1k
views
Unable to drag and drop widgets in Qt Designer
I got a Qt 4 installation using sudo apt-get install qtcreator. I am able to get everything to compile using gcc 4.8. However, when it comes to using Qt Designer to edit the UI of a window, Qt ...
- 29
2
votes
1
answer
127
views
Does a binary built on pi 3 will work on pi 2?
I'm building an app on a raspberry pi 3. I'm using Qt. Will the generated binary work on raspberry pi 2?
Thanks
- 131
1
vote
0
answers
38
views
Process/Flow/steps for speeding of the booting time in raspberry pi for the cluster
I am using Raspberry pi for the cluster, that would display the basic data like the CAN data and one wire data.
For can I used the Can-Socket and for one wire I am just reading a gpio pin of raspberry ...
- 11
1
vote
0
answers
158
views
Example of libcamera with Qt6 in c++?
I'm trying to build a Qt app on my RPi4 using libCamera in c++, but I keep having build/compile issues. Are there any examples of using libCamera in a Qt app in c++?
I'm using Raspbian bullseye, and ...
- 35
1
vote
1
answer
787
views
Download QT 5.12.0 on my Raspberry fails
I currently have the 5.11.3 Qt Version on my Raspberry 3 B+. For another program, I want to use I need at least Qt 5.12.0.
When I try
sudo apt-get install qt5-default
it says that I already ...
- 11
1
vote
0
answers
297
views
QT Creator - Raspberry Pi - 3.5" TFT - Could not initialize egl display
Please forgive my ignorance but I'm new to Raspberry Pi/Linux.
I'm trying to make a touch screen app for the Pi using a 3.5" touch screen (xpt2046) and QT Creator (5.12.5).
QT Creator is running ...
1
vote
0
answers
198
views
pi4 crashes when running any QT apps like RPi imager, VLC, OBS
when opening for example VLC in stock rpiOS the window that asks for metadata network access opens, but its so large that the text in the menu bar takes almost all of my screen and after some time my ...
- 31
1
vote
0
answers
37
views
Horizontal lines on qt 5.13 app . Problem doesn't present with virtual screen (chvt) manipulation
I have a full-screen app in kiosk mode that runs on qt 5.13.2 (Qt compiled from source). Up until 1 week ago, it displayed just fine. Then, I did an apt dist-upgrade and I now get horizontal lines ...
- 609
1
vote
1
answer
1k
views
SIP Generator Error Installing ROS Melodic on Raspberry Pi 4
I've been attempting to install ROS Melodic on my Raspberry Pi 4 (running Raspbian Stretch) according to the instructions on this webpage:
[https://www.instructables.com/id/ROS-Melodic-on-Raspberry-...
- 11
1
vote
0
answers
238
views
Cross-compiling QT interface to a Raspberry PI 3
I'm trying to install Qt interface to a Raspberry Pi 3, which raspbian is the "2016-05-27-raspbian-jessie".
I didn't want to install, directly, all the packages on the raspberry so as to let ...
- 19
1
vote
0
answers
690
views
RaspberryPi2EGLFS guide - EGL/GLES libraries fix fail
I built Qt 5.12.3 for Raspberry Pi following the RaspberryPi2EGLFS guide from Qt Wiki.
I was able to reproduce almost each one of the steps described in the guide, but on step 14 (EGL/GLES libraries ...
- 111
1
vote
0
answers
218
views
Raspberry Pi Qt toolchain on Ubuntu 16.04
I have issues creating a tool-chain for cross compiling Raspberry Pi 3 Qt applications through Ubuntu. I used directions from this guide, https://wiki.qt.io/Raspberry_Pi_Beginners_Guide, to help me ...
- 11
1
vote
1
answer
3k
views
(Error trying to run qjackctl) libEGL warning: DRI2: failed to authenticate qt5ct: using qt5ct plugin
Running Raspbian installed with NOOBS. qjackctl is installed with all its dependencies using Synaptic. Just trying to run Guitarix on my Pi3 B+. I tried following the instructions in this solution, ...
- 11
1
vote
1
answer
1k
views
QCamera get error "mesa-loader failed to retrieve device information"
Qt test code:
QCamera* camera = new QCamera;
auto viewfinder = new QCameraViewfinder();
camera->setViewfinder(viewfinder);
viewfinder->show();
camera->start();
Output:
mesa-loader failed ...
- 145
1
vote
0
answers
764
views
Qt5.10.1 Cross-Compiled to Raspberry Pi Zero W uses EGLFS instead of XCB
I have been trying to create a GUI application using Qt5 on Raspbian Stretch, but the application doesn't launch correctly unless I specifically tell it to run as XCB. This is fine, as I don't need it ...
- 11
1
vote
0
answers
1k
views
PyQt support for WebEngine on raspberry Pi 3 raspbian-stretch
I have installed PyQt5 for Python3. However while I can import various modules into Python I am finding that none of the WebEngine modules import (WebEngine, WebEngineWidgets, WebEngineCore). They ...
- 219
1
vote
0
answers
929
views
Problems with PyQt5
Quoting:
I developed a similar application using PyQt4 and Qt4-designer. You
have to install pyqt4 all modules:
sudo apt-get install qt4-default qt4-designer qt4-doc qt4-dev-tools
python-...
- 11
1
vote
0
answers
291
views
SUID executable doesn't work for `/dev/mem` access
Here is explained how to gain access to the peripheral without being root.
I've just tried in my environment (Raspbian Stretch, RPi2, Qt5.9) in this way:
int main(int argc, char *argv[])
{
...
- 517
1
vote
0
answers
93
views
How to use RF24Mesh on Raspbian in Qt
I want to use the RF24Mesh library in my QT application in Raspbian Jessie.
I can compile the example and run it (with the make command) but when I include libs to my QT app, it gives the error:
...
- 11
1
vote
0
answers
250
views
Cross compiling QT and example program does not find platform
I followed the follwoing guide to cross-compile QT 5.6 on a Ubuntu 16.04 machine for the raspberrypi2 running jessie:
https://wiki.qt.io/RaspberryPi2EGLFS#A_modern_guide_for_cross-compiling_Qt_5....
- 131
1
vote
0
answers
1k
views
Deploy Qt 5.6 onto rPi2 with Jessie
I am working on a Qt project for my pi and I have successfully managed to follow this guide to set up a tool chain from Ubuntu to the Rpi:
https://wiki.qt.io/RaspberryPi2EGLFS
However, now I am ...
1
vote
0
answers
2k
views
defaultServiceProvider::requestService()
We've run into a problem while to trying to use QCamera and QMediaPlayer.
In fact, we need to use a Webcam feedback & a music player (only .mp3).
We already installed:
gstreamer1.0
qt5-default ...
- 11
1
vote
0
answers
330
views
Run GUI application using sudo from a tightvncviewer
I am trying to run Qtcreator with administrator in my remote raspberry Pi board using tightvncviewer from my windows laptop.
I can run Qtcreator and debug my code without using sudo. But I want to ...
- 303
1
vote
0
answers
974
views
Syntax error: word unexpected (expecting ")") ERROR when run : python configure.py
I followed this link to install PyQt5 on Raspbian.
First I cross compiled Qt5 (this link) for Raspberry and executed an example. It worked fine.
When executing this command:
python configure.py --...
1
vote
0
answers
493
views
Raspberry Pi + Qt4 + Opencv cross compile from windows
Hi I want to know how to use opencv in raspberry pi. I have cross compiled qt raspberry from windows and succeed but I cannot add library opencv.
- 11
1
vote
0
answers
3k
views
cross compile qt 5.2
I'm following this tutorial to cross compile qt 5.2. But I'm getting this error:
You have already accepted the terms of the license.
/home/vitor/src/rpi/tools/arm-bcm2708/gcc-linaro-arm-linux-...
- 153
0
votes
1
answer
79
views
Qt6 compiler binary package
I'm aware I can cross-compile Qt6 on my dev machine or I can build the Qt6 from sources directly on the Rapsberry Pi.
But is there any binary package for the compiler? Like when you use the online ...
- 517
0
votes
0
answers
119
views
PyQt QSoundEffect not working on Pi 4B
I am having a perplexing difficulty, in that I cannot get my PyQt program to produce any sound. I am able to get sound correctly from the Pi over HDMI using speaker-test and paplay, so I am happy ...
- 210
0
votes
0
answers
302
views
can we send data or files via wifi from a Raspberry PI using a QT graphical interface to another pc under Windows?
so my Raspberry card is connected to a screen by HDMI, I want to develop an interface using the QT platform under linux to give the order to my Rpi card to send data or files and even to receive ...
- 1
0
votes
1
answer
435
views
Running python GUI application with PyQt and python-vlc as a service
I'm trying to run a python GUI application as a service. The application is using PyQt5 and python-vlc packages. I have the following service file:
[Unit]
Description="Python VLC Service Test&...
- 1
0
votes
0
answers
272
views
Run QT5 app (chiaki remote play) on raspberry OS lite
I would like to run Chiaki (Playstation Remote Play https://github.com/Fredrum/chiaki) on my raspberrypi zero WH running raspberrypiOS lite (so no GUI).
running chiaki itself on a raspberry pi(zero ...
- 113
0
votes
0
answers
4k
views
Could not initialize egl display
I have a CentOS host which should be used to develop Qt applications (version 5.12.8) for a Raspberry Pi. I use the following Raspberry Pi setup:
$ cat /proc/cpuinfo
...
model name : ARMv7 ...
- 203
0
votes
0
answers
674
views
Raspberry pi - QT webenginewidgets problem
I use raspberry pi and QT (version 5.7.1). When I use
QT += webenginewidgets , I get an error
Project ERROR: Unknown module(s) in QT: webenginewidgets
however I try to install
-sudo apt-get install ...
0
votes
0
answers
69
views
MFRC522 and Bluetooth not work together
I have a program in which I use pyqt5, MFRC522 and bluetooth. I have 3 threads, one for the interface, one for the MFRC522 and one for the bluetooth. If I run the MFRC522 and the bluetooth separately ...
- 1
0
votes
0
answers
32
views
The application stalls when the service is loaded at startup
I have RPI3B + with Raspian Stretch on which I run the QT application.
When I create my service to launch the application after starting the rpi i have problems.. The application starts and then the ...
- 11
0
votes
0
answers
217
views
Can't install development files for QT on RPi Zero W
I've been following this tutorial trying to get working QT cross-compilation from my PC to a Raspberry Pi Zero W.
It is failing on Step 5 ("Install a bunch of development files").
Running sudo apt-...
- 101
0
votes
0
answers
1k
views
Malfunction with Qt5 and touch screen on RPi3
I develop a Q5 embedded application on RPi3 and I'm having trouble with the touchscreen.
My problem: The touch area is stretched.
In the picture below, the touch area of the buttons at the corners ...
- 61
0
votes
0
answers
155
views
Control kodi from stdin
I wonder if it possible to send characters to the stdin of kodi (i.e. using Qt QProcess::write() to simulate a keyboard.
I did the same with other applications - like omxplayer - and it worked. But ...
- 517
0
votes
0
answers
1k
views
Is it possible to use Qt Media player on the Pi?
I have a project built using Qt5 which has to play a video. Just like in the videowidget sample code.
I've followed these instructions to build qt5 on my Pi. And it went just fine. But when I try to ...
- 294
0
votes
1
answer
104
views
Need libraries and code for LED dotmatrix driven by MAX7219
I'm using Qt on Raspberry Pi 2 and I'm going to connect 8X8 LED dotmatrix driven by MAX7219.
I need libraries and code for that.
-1
votes
1
answer
290
views
How to use at the same time 2 hardware pwm in wiringpi
I need help to configure 2 hardware PWM channels. I am developing device, and sometimes I will need active 2 PWM channels with different frequencies (frequencies is low: 410 and 580 Hz).I'm writing ...
-1
votes
1
answer
959
views
QT build error: "WARNING: TARGET is empty" and "make: nothing to be done for "first""
I recently installed qt5 on Raspbian. I'm trying to compile this package so I ranqmake && make. I get these errors:
WARNING: TARGET is empty
make: nothing to be done for 'first'
Before ...
- 49