Orin Nx - Sysfs Pin Mapping for GPIO

Autonomous Machines Jetson & Embedded Systems Jetson Orin NX
1

Hello,

I was trying to implement the SIM7600X 4G on the Orin NX using this wiki and I ran into an error invalid argument while executing this line:

echo 200 > /sys/class/gpio/export

I realized that this error could be due to me using a Jetson Orin NX instead of the Jetson Nano used in the wiki. The Mapping for GPIO on the Orin NX is different than the Jetson Nano. I was able to find the 40 pin Mapping of the Systs GPIO for Jetson Nano GPIO Header (NVIDIA Jetson Nano J41 Header Pinout - JetsonHacks), but I can not find the 40 pin Mapping for the Orin NX which I need.

Is there a command or documentation to easily map the Sysfs GPIO pinouts of the Orin NX 40 pin GPIO header?

I also heard about the usage of Sysfs GPIO being deprecated, what would be the best way forward?

Thanks in advance!

3

Hi officialbertolaf606012,

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

Please refer to the Jetson Orin Nano Developer Kit Carrier Board Specification and find the following table.
image

You have to check the above table/pinmux spreadsheet/following command to get the gpio number for sysfs.

$ sudo cat /sys/kernel/debug/gpio

You still could use sysfs to control GPIO but you need to get root permission first.
For the new suggested method, you could refer to the following thread for gpiod.
Unable to access GPIO in the latest L4T 35.3.1 - #23 by lhoang

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