raspberrypi | Welcome to my Raspberry Pi tools and scripts

I am trying to build a simple "hello_there" Ada app to run on a Raspberry Pi 2/Raspbian machine but have come across a linkage issue.

So far, I've done the following and had the following issues:

1. Downloaded the "Raspberry Pi 2 Linux" GNAT GPL Ada toolchain for cross compiling (linux-on-linux) on the host machine (Ubuntu 16.04)

2. Ran "doinstall" on the host machine successfully.

3. Created a simple "hello_there.adb" file which just prints a message to the console.

4. Ran {INSTALL_ROOT}/gnat-gpl-2016-raspberrypi-linux-linux-bin/bin/arm-linux-gnueabihf-gnatmake -v hello_there.adb to build this small app.

5. That complained that the crt1.o | crti.o | crtn.o files cannot be found and since I couldn't use the ones under /usr/lib/x86_64-linux-gnu/ on the host machine (as I assume, these can only be used for a x86 target) the only solution I could find was to copy these files from the target machine which are located under /usr/lib/arm-linux-gnueabihf to the gnatmake command dir. That stopped the linker complaining about these.

6. Ran again {INSTALL_ROOT}/gnat-gpl-2016-raspberrypi-linux-linux-bin/bin/arm-linux-gnueabihf-gnatmake -v hello_there.adb but now the linker is complaining with the following error:

   {INSTALL_ROOT}/gnat-gpl-2016-raspberrypi-linux-linux-bin/bin/../libexec/gcc/arm-linux-gnueabihf/4.9.4/ld: cannot find -lc

   It looks like compilation and binding complete fine but but linking fails. The full output is the following:

   ...

Today I run into strange bash behaviour, i made this simple example:

Hello everyone, I'm facing an issue with pip while installing rtmidi-python on my Raspberry Pi 4B running Raspbian 11.

The building wheel keeps failing for that package only and I get two errors: subprocess-exited-with-error and legacy-install-failure.

Here's the output for the command pip install rtmidi-python :

I am running into the following error when starting up containers on my Raspberry Pi 3B on Raspbian Buster:

I want to display some sensors data from raspberry pi (using python socketio) in react as frontend and I am using nodejs as backend. Data is currently displaying in the console (nodejs) but I can't seem to figure out how it will displayed in react. Sorry for this basic question but I can't seem to find a reasonable way to implement this. Here are my codes for raspberry pi, node and react.

I am honestly about to just give up, i've tried so many different possibilities, for multiple weeks now, almost a month, of multiple problems.

I am a new-ish programmer, especially with java, but i have a good understanding about java

I am able to create a maven project no problem, i have no problems with the structure of java itself, but i don't fully understand the pom.xml.

The file compiles just fine, but when i go to start it with java -jar (filename), i get the following output;

Exception in thread "main" java.lang.NoClassDefFoundError: com/pi4j/Pi4J at com.pi.rasberri.Main.main(Main.java:16) Caused by: java.lang.ClassNotFoundException: com.pi4j.Pi4J at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520) ... 1 more

Heres my pom that i have figuratively almost dismembered;

...

I use the following code in order to get the city the iss is flying over. I used the code from the astro-pi tutorial(https://projects.raspberrypi.org/en/projects/code-for-your-astro-pi-mission-space-lab-experiment/2):

I am running a python script on RaspberryPi 4, and today when I ran the script again, it showed me the error ModuleNotFoundError: No module named 'adafruit_ssd1306' although I ran this same script yesterday about 10 times, it ran perfectly without any errors. I did not change anything in the script, not even its location. I tried force reinstalling the library, running the script from another location, rebooting the pi, running it as sudo but none of them worked either. By using pip3 freeze it shows that the package is installed and trying to install the package again says that the requirement is already satisfied.

Python version: 3.7

Main.py

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:

1. 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?

2. if something is missing, how do I go about finding out what was missed? I assume there is a log file?

Console output below: