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Enable/Disable GUI Jetson

Disable

sudo systemctl set-default multi-user.target

Enable

sudo systemctl set-default graphical.target

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IMX219 stream

The parameter sensor-id= describes the camera target. This id can be found by using ls /dev/. If the camera correctly plugged in then there should be a devices called /dev/videoX, where X is the camera id.

test@test-desktop:~$ gst-launch-1.0 nvarguscamerasrc sensor-id=0 ! 'video/x-raw(memory:NVMM), width=(int)1280, height=(int)720, format=(string)NV12, framerate=(fraction)30/1' ! nvvidconv ! queue ! xvimagesink

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Watch SOC temp Jetson

T186/T194 (Xavier AGX, Xavier NX, TX2, ...)

Peak

• Xavier: CPU@90C GPU@92.5C AUX@89C
• Xavier NX: CPU@90.5C GPU@91.5C AUX@90C
• TX2: CPU@95.5C GPU@95.5C

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# Decompile
dtc -I dtb -O dts -o devicetree.dts /boot/dtb/<your_devicetree_file_name>.dtb

# Compile
dtc -I dts -O dtb devicetree.dts -o <your_devicetree_file_name>.dtb

# Merge with DTBO
fdtoverlay -i modified-base.dtb -o modified-full.dtb  /boot/tegra194-p3668-all-p3509-0000-user-custom.dtbo

# DTS from fs

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Available tach settings

cat /sys/class/hwmon/hwmon2/pwm_rpm_table

Enable tach

echo 1 > /sys/devices/pwm-fan/tach_enable

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sudo parted /dev/sdb mklabel gpt
sudo parted /dev/sdb mkpart APP 0GB 32GB
sudo mkfs.ext4 /dev/sdb1
Put the Jetson device into recovery mode (middle button ~4 seconds… then combo left button ~4 seconds… then release both)
Connect USB-C from host to Jetson (port next to power light)
sudo BOOTDEV=sda1 ./flash.sh --no-flash jetson-agx-xavier-devkit sda1
sudo mount /dev/sdb1 /mnt
sudo mkdir tmp_system
sudo mount bootloader/system.img.raw ./tmp_system
sudo rsync -axHAWX --numeric-ids --info=progress2 --exclude=/proc ./tmp_system/ /mnt

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List i2c devices on a specific bus:

Syntax: i2cdetect [options] <busNr>

test@test-desktop:~$ i2cdetect -y -r 8
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

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Important commands:

# Get related infos for flashing (sector size, start and end addresses)
sudo fdisk -l /dev/sdc

# Alternative for better regex actions:
sudo sfdisk -d /dev/sdc

# Copy image to storage

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export type SelectorType = "option1" | "option2";
export type SelectType<S extends SelectorType> = S extends "option1"
  ? Type1
  : S extends "option2"
  ? Type2
  : never;

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export function generateUUID(): string {
  let dt = Date.now()
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
    const r = Math.trunc((dt + Math.random() * 16) % 16)
    dt = Math.floor(dt / 16)
    // eslint-disable-next-line no-bitwise
    return (c === 'x' ? r : (r & 0x3) | 0x8).toString(16)
  })
}