Jetson GPIO pins not producing any output

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

Hello,
I’ve been trying to follow [this](https://automaticaddison.com/how-to-blink-an-led-using-nvidia-jetson-nano/) guide to create a blinking LED on a Jetson AGX Orin dev kit. I was intending on this being a task that only took a couple of minutes, but it appears that my GPIO pins are not outputting any voltage (tested with a multimeter). I verified that my breadboard circuit works (using the 5V and ground header on the Jetson itself, as a matter of fact). I also followed [this](https://github.com/NVIDIA/jetson-gpio) guide on setting up the system on the software side of things. Am I forgetting to do something?

3

Hi eu52,

What’s your Jetpack version in use?

The guide seems written for Jetson Nano rather than AGX Orin.

Have your tried using sysfs to control LED?
Which GPIO are you using?

4

I assumed that the guide should apply to the Orin because GPIO functionality is shared between both systems and the same Jetson.GPIO Python library works on both units - please let me know if my assumption is incorrect.

I’m currently on Jetpack 5.0.1-b118. I’ve tried using the physical pin 7 (so gpio454) through both Python and sysfs with no luck. The python script runs without error on the software side of things, and I assigned gpio454 as an output through sysfs.

I’m very new to Jetson hardware (and embedded systems in general) so please let me know if there were additional steps I was supposed to take, perhaps when first setting up the Orin.

5

They are from different platform (T210 and T234) and also different release (R32 and R35). Since you are using the AGX Orin devkit, I would suggest you updating to the latest Jetpack 5.1.2 (R35.4.1) release.

Do you mean the PIN7 of 40-header pin, which is also the following pin you are using?

 gpio-454 (PQ.06               )

image
image2662×37 3.57 KB

If so, please run the following commands to control this pin.

# cd /sys/class/gpio/
# echo 454 > export
# echo out > PQ.06/direction
# echo  0 > PQ.06/value
# echo  1 > PQ.06/value
6

No dice, I’m guessing that

echo 1 > PQ.06/value

is supposed to set the pin to 1. The commands all run without error, there’s just no output from the pin. Is this indicative of an issue with the hardware?

7

Could you measure the voltage of the pin when you run the command?
I can’t reproduce this issue on the AGX Orin devkit with R35.4.1.

9

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