Error controlling GPIO pins from the command line

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin Nano
1

What would cause the following error when trying to write to the export file from the command line?
echo 79 > /sys/class/gpio/export
bash: echo: write error: Invalid argument

I am trying to write to the GPIO pin from the command line. This is what the permissions on the export file are set to
ls -l /sys/class/gpio/
total 0
–w–w---- 1 root gpio 4096 Dec 3 10:47 export
lrwxrwxrwx 1 root root 0 Dec 3 11:31 gpiochip316 → …/…/devices/platform/c2f0000.gpio/gpio/gpiochip316
lrwxrwxrwx 1 root root 0 Dec 3 11:31 gpiochip348 → …/…/devices/platform/2200000.gpio/gpio/gpiochip348
–w–w---- 1 root gpio 4096 Dec 3 10:47 unexport

I have tried changing the ownership but that did not help. I am also able to run the sample apps and control the pin. Not sure what I am missing here.

Platforn: Jetson Orin Nano

3

Hi care2577,

Are you using the devkit or custom board for Orin Nano?
What’s the Jetpack version in use?

Could you share the result of the following command on your board?

$ cat /etc/nv_tegra_release
$ sudo su
# ls /sys/class/gpio
# cat /sys/kernel/debug/gpio
4

Hi KevinFFF:
I am using the devkit
The output of the last command you requested answered my question.
echo 476 > /sys/class/gpio/export # worked as expected

Thanks for your help

6

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