matthewjberger

# Check the systemd journal for mentions of my-service 
journalctl | grep -i my-service

# Show the status of the service
systemctl status my-service

# Service is at /lib/systemd/system/my-service.service
# After editing unit file on disk, reload the units
systemctl daemon-reload

matthewjberger

dtc -I fs -O dts -s /proc/device-tree -o flattened.dts

matthewjberger

 find /lib/modules/$(uname -r) -type f -name '*.ko*'

matthewjberger

1.) Download a Nerd Font

2.) Unzip and copy to ~/.fonts

3.) Run the command fc-cache -fv to manually rebuild the font cache

matthewjberger

How to patch the device tree for a custom RPI CM4 board

Locating the kernel source

Run devtool modify linux-raspberrypi from the same shell you run bitbake my-image from. The kernel source tree will be copied to build/workspace/sources/linux-raspberrypi.

Make edits to the device tree at build/workspace/sources/linux-raspberrypi/arch/arm/boot/dts/bcm2711-rpi-cm4.dts and then run git diff > 0001-my-patch-description.patch.

Getting the name of the kernel recipe

matthewjberger

# Generate a key
# RSA and RSA
# 4096 bits
# Email from your .gitconfig
gpg --full-generate-key

# List key information
gpg --keyid-format LONG -k

matthewjberger

The default branch has been renamed! develop is now named main

If you have a local clone, you can update it by running the following commands.

git branch -m develop main git fetch origin git branch -u origin/main main git remote set-head origin -a

matthewjberger

fn main() {
    let topic = TopicBuilder::new("lift", "report")
        .with_subdevices(&["motor"])
        .build();
    println!("Topic: {:#?}", &topic);
}

#[derive(Debug)]
pub struct Topic {
    display: String,

matthewjberger

use thiserror::Error;

#[derive(Error, Debug)]
pub enum StateMachineError {
	#[error("No states are present in the state machine.")]
	NoStatesPresent,
}

type Result<T, E = StateMachineError> = std::result::Result<T, E>;

matthewjberger

// let (entities, duration) = profile!(world.create_entities(1_000_000));
// println!("Creating 1 million entities completed in {:?}", duration);
//
// let results: Vec<(_, Duration)> = profile_n!(100, world.create_entities(1_000_000));

#[macro_export]
macro_rules! profile {
    ($($actions:tt)*) => {
        {
            let start = std::time::Instant::now();