Using UART ttyTHS1 without sudo on Jetson Nano

[coriolan]

Hello,

I’m using the Jetson Nano dev kit to read data from a sensor using UART_2 (/dev/ttyTHS1), which are pins 8 and 10 of the J41 header.
I wrote a code in C that works great. However, I have to launch the program using
sudo ./my_code.c
to run the code, otherwise, I get an error saying that the program cannot open ttyTHS1.
That’s not convenient for me as I need this code to run at startup without the need for me to come in and type my password.
When I do cat/dev/ttyTHS1, I get “Permission denied”.
sudo cat/dev/ttyTHS1 works.

I have tried many different things, such as:
sudo usermod -a -G dialout $USER

I have also added the following the /etc/udev/rules.d/50-myusb.rules
KERNEL=="ttyTHS[0-9]*",MODE="0666"

None of them worked. Am I missing something?
Thanks

[WayneWWW]

This thread might help.

Read & write permission ttyTHS1

Hi everyone, How do i get read and write permission for the /dev/ttyTHS1 on every startup? I can of course do sudo chmod 666 /dev/ttyTHS1, but I wanted a headless startup, without having to enter the password. I tried two ways so far - without success: I created a udev rule: /etc/udev/rules.d/55-tegraserial.rules containing: KERNEL=="ttyTHS*", MODE="0666" I created a rc.local file, that gets executed: #!/bin/sh -e # chmod 666 /dev/ttyTHS1 touch /home/nano/test.txt exit 0 rc.local gets…

[coriolan]

Thank you, that solved it!