Hardware setup

• 1 Jetson Nano Developer Kit
• 2 Allied Adapter board for NVIDIA Jetson Nano Developer Kit
• 2 Alvium MIPI CSI-2 Cameras

Board bringup

• Install JetPack 4.6.1 (use exactly this version) by flashing the SD card (don't bother with SDK manager)
• Get the drivers from github

wget https://github.com/alliedvision/linux_nvidia_jetson/releases/download/l4t-32.7.1-4.0.0/AlliedVision_NVidia_nano_L4T_32.7.1_4.0.0.gc3fa7ac49.tar.gz -O ~/AlliedVision_NVidia_nano_L4T_32.7.1_4.0.0.gc3fa7ac49.tar.gz
cd ~
tar xvf AlliedVision_NVidia_nano_L4T_32.7.1_4.0.0.gc3fa7ac49.tar.gz
cd AlliedVision_NVidia_nano_L4T_32.7.1_4.0.0.gc3fa7ac49
AlliedVision_NVidia_nano_L4T_32.7.1_4.0.0.gc3fa7ac49
./install.sh # Enter prompt info as needed
sudo reboot

• Install apt packages:

sudo apt install v4l-utils

• To get a list of available v4l2 controls:

v4l2-ctl --list-ctrls --device /dev/video0

• Install the Jetson GPIO package:

pip3 install Jetson.GPIO
sudo groupadd -f -r gpio
sudo usermod -aG gpio $USER
sudo wget https://raw.githubusercontent.com/NVIDIA/jetson-gpio/master/lib/python/Jetson/GPIO/99-gpio.rules -O /etc/udev/rules.d/99-gpio.rules

• Create a file at /etc/udev/rules.d/99-record.rules and put in the following:

ACTION=="add", SUBSYSTEM=="video4linux", KERNEL=="video0", TAG+="systemd"
ACTION=="add", SUBSYSTEM=="video4linux", KERNEL=="video1", TAG+="systemd"

• Copy the systemd service:

sudo cp scripts/record.service /etc/systemd/system/.

• Enable the service:

sudo systemctl enable record

• Reboot