10
votes
Accepted
Qt applications don't work due to libEGL
It's a usual linux and Unix problem, nothing Pi-related. Here is the problem: your libs need to be symlinked. Do sudo -s and become a root for such an operation. And let's troubleshoot it!
First, ...
- 926
7
votes
Install GPIO problem
You can't install RPi.GPIO on Windows. If you want to mock GPIO calls on a PC, try gpiozero which has a mock pin interface: https://gpiozero.readthedocs.io/en/stable/api_pins.html
- 2,451
6
votes
Accepted
How can I install raspistill/raspicam on a distro that doesn't include them?
raspistill or raspivid. How can I install these?
They're distributed pre-compiled (armv6, which will work with any distro that runs on any model) via the Raspberry Pi Foundation's github site, in ...
- 58.9k
5
votes
Accepted
Cross compiling for RPi - error while loading shared libraries
Shared or dynamic libraries are needed at run time. So you need the library not only on the build system but in on the target system, in this case on the PI.
This is different from static libraries. ...
- 2,188
5
votes
Accepted
Why I cannot access last package version?
You can use packages.debian.org to check this in a really easy way. I usually just search in Google for the package name and look for the result from the Debian Packages site.
Here's libgles2-mesa-...
- 6,308
4
votes
Accepted
Upgrading libc (libc6) raspberry pi os (rasbian buster)
The Pi can still boot because the kernel does not use userspace libraries, so it's unaffected. However, almost every userspace Linux program uses glibc, so when you replace that library, you will ...
- 28k
3
votes
Interfaces besides sysfs for GPIO programing in C
The sysfs system filesystem access to the GPIO is all that is provided as a standard library from Linux.
There are dozens of third party libraries.
See http://elinux.org/RPi_GPIO_Code_Samples for ...
- 71.1k
2
votes
Accepted
2
votes
Accepted
Unable to integrate Fingerprint sensor in Raspberry Pi2
Thanks to Joan for solving the problem.
First and foremost, you need a library to run your fingerprint sensor.I found one here:
https://github.com/bastianraschke/pyfingerprint
Follow the ...
- 171
2
votes
Accepted
I deleted /lib How can I get it back?
Not easily I am afraid. If you can afford downtime the easiest thing is to shutdown, backup the disk, reinstall then recover from the backup.
If you can afford downtime but don't want to do a ...
- 761
2
votes
Raspicam images are way too dark when raspistill is not used
I don't know the exact solution to your problem, but I had the same issue with raspistill when the camera had not enough time to "warm up" (when the --timout option is set to 0 or a only a few ...
- 151
2
votes
Accepted
Library to allow use of Pi camera in projects?
The usual way to use the camera from C/C++ is to use libmmal (this is the library used by raspistill and raspivid). The source is part of the userland repository, specifically look under interface/...
- 3,978
2
votes
Accepted
2
votes
Qt applications don't work due to libEGL
In my case this fixed the issue
sudo ln -s /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2 /usr/lib/arm-linux-gnueabihf/libGLESv2.so
- 21
2
votes
What is the best codec and library in order to achieve wireless video and audio transmission through Raspberry and LoRa?
LoRa is NOT intended to be used for such a thing. LoRa operates in the free ISM band. As such there are rules that don't allow transmission over a long period (the maximum allowed transmission time is ...
- 2,702
1
vote
Manually update curl on Raspbian stretch
You have two options.
Upgrade "Raspbian stretch" to a more recent version of Raspberry OS.
or
Uninstall curl sudo apt remove curl and then follow "how to install curl and libcurl&...
- 983
1
vote
RPI 4 — need libcrypto.so.1.0.0 to compile and run
If you want to do this properly:
Ask the client to send you the missing libraries. I think the modern way of doing so is packaging the app in a Docker container.
Ask the client to built their ...
- 28k
1
vote
Accepted
OpenCV install 'so' files not found cant insall via apt
You probably just need to run
sudo apt update
That needs to be done to find new versions. After that you can use apt to install the packages you need to get those libraries. For example libcblas.so....
- 871
1
vote
Impossible to install a shared library
There shouldn't be spaces between /usr/local/lib: /home/IoTree/ and between site-packages / just a colon, I think. The spaces look wrong in the export LD_LIBRARY_PATH line
That is to say:
alias ...
- 2,740
1
vote
Accepted
libjpeg8 on Debian 9 (Stretch)
Try:
sudo apt update
sudo apt install libjpeg8
If you're attempting to run an existing snes9x binary on Stretch, once you have all dependencies it will typically work as long as you haven't enabled ...
- 2,904
1
vote
Accepted
Xojo HTMLviewer Raspberry Pi3 WebKit
Run Wheezy (No, Really)
I cannot run Wheezy as it will not run on the Pi 3 due to kernel support for ARMv8
According to this answer, you can run Wheezy on the RPi3. You just need to update Wheezy ...
- 1,836
1
vote
Interfaces besides sysfs for GPIO programing in C
AFAIK WiringPi should be included in latest Raspbian. If you have the gpio utility it is there (as gpio is a WiringPi utility).
- 60k
1
vote
Picamera Python Library Alternatives
I recommend that you try a module called opencv
you may install it by running the following command:
install python-opencv bindings, numpy
here is some example code to help you get started:
import ...
- 2,383
1
vote
cec-client on Wheezy (retropie) not finding TV
Those error message from the linker ld is tell you it cannot find the required librariesheader files to linkinclude with the software that has been when it is compiled. That usually means installing ...
- 3,621
1
vote
Accepted
cec-client on Wheezy (retropie) not finding TV
The only way I was able to fix this, is upgrading to Jessie and rebuilding it from source.
This time I didn't use make install but checkinstall to not have those issues in future.
- 1,617
1
vote
Raspicam images are way too dark when raspistill is not used
Trying changing shutter speed to zero if it is not already zero in private_impl.cpp in raspicam/src/private/.
Shutter speed decides the time till which the frames is exposed hence regulates the ...
Only top scored, non community-wiki answers of a minimum length are eligible