RaspberryPi4 | QtDragon implementation for RPi4 using VTK graphics
kandi X-RAY | RaspberryPi4 Summary
kandi X-RAY | RaspberryPi4 Summary
QtDragon implementation for RPi4 using VTK graphics Install linuxcnc (available from Install python-pyqt5 Install vtk ( deb file provided) If you want to use qtdesigner, you will have to compile pyqt5 from source as the default installation is only for x86 architectures.
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Top functions reviewed by kandi - BETA
- Initialize the mesh .
- Generate a raster . raster
- Called when a key event is received .
- Load the program .
- Load back the backplot .
- Draws lines .
- Rotate the gz coordinate .
- Called when the additive operator is clicked .
- Draw holes .
- Create a program .
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RaspberryPi4 Examples and Code Snippets
Community Discussions
Trending Discussions on RaspberryPi4
QUESTION
I have raspberrypi4.
Current official Raspberry OS is 32-bit a.k.a armhf(armv7l).
I have some issues installing packages or using docker images and I think it is related to 32-bit system.
It seems like ARM architecture has less binaries compatible than x86. And 32-bit armhf is even worse.
So, what I'm curious about is...
would installing 64-bit version of OS help some compatibility issues with packages? I mean like there are few apt PPAs supports 32-bit. Will I be able to use more PPAs and install latest packages with 64-bit OS?
Any suggestion or guess is welcome.
...ANSWER
Answered 2022-Feb-15 at 13:03Yes, arm64 is a better choice for wider compatibility with available docker images. arm64 images are also able to use more than 4GB process memory.
As of 22 February 2022 on hub.docker.com:
- 123,643
ARM64images - 69,567
ARMimages
QUESTION
I am now developing a kernel module to handle two digits 7-segment led indicator via I2C device on RaspberryPi4 with RaspberryPiOS.
This module uses kernel thread to handle 7-segment led display, change digit position.
Sending command to i2c device requires i2c_client* structure, it can be obtained via formal argument of probe function.
Kernel thread does not have formal argument of i2c_client structure.
My solution is to store a pointer of i2c_client* structure into a global variable and use this pointer inside kernel thread, and call i2c function with this pointer.
My kernel module works well, at least now...
Do you have better solution to use i2c function in kernel thread? or exists better solution?
My entire code is below...
...ANSWER
Answered 2022-Jan-24 at 07:57The second argument of the function kthread_create() is void *data.
Right now you are passing NULL, you can pass your pointer to the struct i2c_client instead.
Then you can do:
QUESTION
I am new to Yocto and building my first image for RaspberryPi. I've followed the example given here. It seems to complete without errors but I am not sure if it is a successful build given the Sstate summary which says "Sstate summary: Wanted 173 Found 163 Missed 1" "99% complete". I repeatedly build the image but the results does not change.
I have read this post but it does not seem to answer my questions.
I also understand that the shared state cache is used to rebuild only what is necessary.
My questions as follows:
does this mean that the build has completed or that something was missed and I'm not getting everything I asked for in the build recipe?
if something is missing, how do I go about finding out what was missed? I assume there is a log file?
Console output below:
...ANSWER
Answered 2022-Jan-19 at 14:25Shared state is a caching mechanism used by bitbake. The "Missed 1" means that one sstate task in the build couldn't be obtained from the sstate cache. This is perfectly fine, it just means it required to run that task and couldn't get it from the cache.
QUESTION
I am trying to build a core-image-minimal image raspberry pi 4 target machine.
For the setup project;
- I am using latest dunfell distribution version which is 3.1.12
- I added onl poky, meta-openembedded and meta-raspberrypi layers and also added those to the bblayer.conf
- I changed Machine field as raspberrypi4 in the local.conf file
So I do have basic setup for raspberrypi but while bitbake on my linux laptop, the progress is being stuck on these two do_compile task in below image.
I know it should suppose to take longer when you use local laptop. But I did run this job yesterday, and it was still stuck on this two tasks after running 14 hours, so I had cancelled. But now again it stuck on this two task, so I wonder if something is wrong, or I am missing something.
My linux laptop system information:
- Available storage space: 124 GB
- AMD Ryzen™ 5 PRO 3500U Processor (4 Cores / 8 Threads, 2.10 GHz, up to 3.70 GHz with Max Boost, 2 MB Cache L2 / 4 MB Cache L3)
- 8 GB of RAM
- Ubuntu 20.4
Do you have any suggestions, what might be wrong?
...ANSWER
Answered 2021-Dec-02 at 21:18Did you try clean it with cleanall?
QUESTION
I am utilizing yocto (dunfell) to cross-compile a project for multiple different architectures. Specifically, the targets I have are a 64-bit RaspberryPi4 (aarch64) and a 32-bit Orange Pi (armhf). My project that I am cross-compiling compiles and runs without issue when building for the raspi target; the runtime linker is properly set and things run without issue. However, whenever I build for the Orange Pi target, the program appears to compile without issue, but when I try to execute it on the platform, I get a "File not found" error.
This appears to be because the interpreter (runtime linker) is set to /usr/lib/ld.so which is not actually on the system. See below:
ANSWER
Answered 2021-Dec-03 at 13:53After a few days of debugging, I figured out there problem. If anyone with more knowledge than I on linking would like to chime in to add things, please do. Ultimately, this was resolved by using gcc as the linker as opposed to using ld (the ones provided by yocto's cross compiler; i.e. aarch64-poky-linux-gcc).
In order to do this, I modified my recipe to pass in LD=${CC} LDFLAGS=${LDFLAGS} to my Makefile. Now, it builds and executes properly for both the RPi and OrangePi targets.
I believe this is mainly the case because the LDFLAGS provided by yocto actually can't be parsed by ld. From my research, it looks like ld is typically invoked by gcc. However, the flags still need to get to the complier. So, originally, LDFLAGS that needed to be passed into linking, weren't being passed in at all because I just assumed there was an error with doing it that way. So, be sure you're passing your LDFLAGS that yocto gives you into gcc.
QUESTION
I would like to include UART3 and UART5 overlay to enable them, using Yocto. They are already delivered with the whole package (https://github.com/raspberrypi/linux/blob/rpi-5.10.y/arch/arm/boot/dts/overlays/uart3-overlay.dts) I added to my main image recipe lines:
...ANSWER
Answered 2021-Nov-19 at 14:52Found the solution.
Just add those lines into the local.conf inside the build folder.
QUESTION
I am currently working on Azure Device Update using layers meta-azure-device-update and meta-swupdate. I want to run a post-install script. I have followed sources mentioned below:
1.sw-description.rst https://git.rigado.com/vesta/swupdate/-/blob/acf50e361a8752db48e69ffe3c20a167c402d35f/doc/source/sw-description.rst#board-specific-settings
2.adu-swupdate.sh https://github.com/Azure/iot-hub-device-update/blob/main/src/adu-shell/scripts/adu-swupdate.sh
The image was built successfully and I was able to locate adu-swupdate.sh in .swu file which I provided Azure Device Update. The install failed giving below mentioned error:
Sep 21 07:21:30 rpi AducIotAgent[281]: -> 07:21:29 PUBLISH | IS_DUP: false | RETAIN: 0 | QOS: DELIVER_AT_MOST_ONCE | TOPIC_NAME: $iothub/twin2021-09-21T07:21:30.2396Z [E] Install failed, extendedResultCode = 1 [Install]
Sep 21 07:21:30 rpi AducIotAgent[281]: 2021-09-21T07:21:30.2398Z [E] Install failed. error 0, 1 - Expecting service to send Cancel action [ADUC_Workflow_WorkCompletionCallback]
The sw-update log is as given below:
...ANSWER
Answered 2021-Nov-15 at 16:17So, After hours of exploration and reading each page of SW-UPDATE Wiki, I figured out that there are handlers for each function which we must enable before using it.
you can read more about them here. https://sbabic.github.io/swupdate/handlers.html
These handlers are available in the meta-swupdate/recipes-support/swupdate/defconfig
QUESTION
I've installed Debian Bullseye from this page: https://raspi.debian.net/daily-images/
on a Raspberry Pi 4 machine and prepared the required libraries and packages following these guides:
https://github.com/abhiTronix/raspberry-pi-cross-compilers/blob/master/QT_build_instructions.md
This is the compiler I'm using: https://snapshots.linaro.org/gnu-toolchain/12.0-2021.10-1/aarch64-linux-gnu/gcc-linaro-12.0.0-2021.10-x86_64_aarch64-linux-gnu.tar.xz
from this page: https://snapshots.linaro.org/gnu-toolchain/12.0-2021.10-1/aarch64-linux-gnu/
issue description
When I run ./configure... after some processing the compiler throws an error:
aarch64-linux-gnu-g++: error: unrecognized command-line option
-mfloat-abi=softfp
Meanwhile, Linaro or official ARM compilers do not support VFP, FPU, etc. so I had to change the qmake.conf to try to remove that command-line option from the compiler flags.
...ANSWER
Answered 2021-Oct-11 at 03:33fixed this by editing the qmake.conf
used linux_device_post instead of linux_arm_device_post
QUESTION
the code below works well on window, but the error occur when I try to run it on raspberrypi4
...ANSWER
Answered 2021-Sep-05 at 16:48This is because you are running an older version of Node on the Pi. Private instance fields are part of ES2022 for which you need node version 12.4 or above. You can see the support for different versions here: https://node.green/
QUESTION
Could someone please give me advice to make an openbmc image for Raspberrypi platform ? Before I tried, I looked through related documents and believed an openbmc image can be worked on Raspberrypi. Like OpenBMC with Raspberry Pi (2 or 3) and build bmcweb? and https://kevinleeblog.github.io/project1/2019/11/25/openbmc-for-raspberry-pi-zero/.
So, I followed these instructions and tried the following steps.
#1: Git clone openbmc.git to my local PC.
...ANSWER
Answered 2021-Sep-02 at 16:57Interesting, I don't have a quick fix for you but I did notice the partition that is over sized is the uboot partition. The uboot is a smaller separate binary installed on the machine. It looks as if your uboot build is over 512k and the partition is set for 512k. Your flash size is massize
FLASH_SIZE = 9437184" that is more then a gig, (because FLASH_SIZE is in K)
If I were you I would first try to build an older version of openbmc for raspberry pi. (It used to work so you just need to find the commit before uboot grew to big). Use git to move back a month until you find it works.
If that does not work I would try to modify the partition table. here is where you failing
- this looks fine building the uboot image looks fine
- increasing the kernel offset make if build, but the other targets in openbmc will not be happy with this solution. So maybe meta-raspberry-pi will have to override the partition table (if uboot can not be shrunk)
What ever you do, open an issue on the github and share you changes. Also use the discord, and gerrit.
I just replicated this issue. We should fix it
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Install RaspberryPi4
You can use RaspberryPi4 like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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