mgiuli
commented
2 years ago I ran into the same issue. After researching various sites, I cobbled together a method that worked for me. I'm posting it below in hopes of helping someone else in the future. Please note that I am not an expert and this method could include steps that are not needed.
To start using the I2C, we have to install some packages before:
sudo apt update sudo apt upgrade -y reboot sudo apt install -y i2c-tools python3-pip After that, we have to install the smbus2 package using pip: sudo pip3 install smbus2
Remaining setup: Environmental configuration
sudo apt install make sudo apt install gcc
Download library
git clone https://github.com/UCTRONICS/U6143_ssd1306.git
Manually create a systemd service We will need to manually create a SystemD service which will start at system boot.
sudo nano /etc/systemd/system/rc-local.service
Now enter the following text, save and close the file. [Unit] Description=/etc/rc.local Compatibility ConditionPathExists=/etc/rc.local
[Service] Type=forking ExecStart=/etc/rc.local start TimeoutSec=0 StandardOutput=tty RemainAfterExit=yes SysVStartPriority=99
[Install] WantedBy=multi-user.target
Open the /lib/systemd/system/rc-local.service file and add the following content at the end of the file.
sudo nano /lib/systemd/system/rc-local.service Paste in the following to the bottom of the file, save, and exit. [Install] WantedBy=multi-user.target Alias=rc-local.service
Create and Edit rc.local file Now we will need to edit the /etc/rc.local file. Issue the following command and press Enter
sudo nano /etc/rc.local Paste in the following, this ensures that the script is bash executable, all bash scripts should have this at the top
!/bin/bash
cd /home/ubuntu/U6143_ssd1306/C sudo make clean sudo make sudo ./display &
save and close the file. We will now need to append permissions to make the newly created file executable. Issue the following command and press Enter
sudo chmod +x /etc/rc.local
Enable the service on boot (enable rc.local with systemd on Ubuntu 20.04) Create a soft link in the /etc/systemd/system directory
sudo ln -s /lib/systemd/system/rc.local.service /etc/systemd/system/
After that, enable the service on system boot
sudo systemctl enable rc-local
Now let’s reboot the system and check to see if the service is working.
Sources: I2C enable Source: https://medium.com/vacatronics/getting-started-with-raspberry-pi-i2c-and-ubuntu-server-eaa57ee0baf2
/etc/rc.local system enable source: https://marsown.com/wordpress/how-to-enable-etc-rc-local-with-systemd-on-ubuntu-20-04/
UCTRONICS Ubuntu Source: https://github.com/UCTRONICS/U6143_ssd1306/tree/master/Ubuntu
noahbrooks
The script doesn't start automatically on Ubuntu server 22.04 after reboot.