GPIO Interrupt not working on Jetpack 6

Autonomous Machines Jetson & Embedded Systems Jetson Orin Nano
1

Hi,

i am currently trying to capture a interrupt signal in C using the libgpiod library on the Nvidia Jetson Orin Nano DevKit. The Orin is running on Jetpack 6. I previously worked on the Jetson Nano and there, everything worked just fine.
Now on the Orin, i can successfully set the State of a GPIO when configured as Output, but i cant capture an Interrupt. When using gpioinfo, I can validate, that my programm is configuring the GPIO i am using just right, but still the signal is not detected.
I also tried to capture a Interrupt using Pythons Jetson.GPIO, but this also was not successful. Is there anybody running into the same issue?

Note: Under Jetpack 6, SYSFS (meaning /sys/class/gpio/…) access is not available.

Thank you,
Tim

3

Hi,

Can you at least control high/low output value for that specific GPIO pin?

This is expected.
We remove it on purpose because it was deprecated by upstream Linux kernel a long time ago.

4

Hi DaveYYY,

Yes, the output functionality is fully working. Only Input is not, whether detecting Interrupts or getting the Input Value of a GPIO. This is not working In C with libgpiod and python with Jetson.GPIO.

Regards,
Tim

5

Did you set the pin you want to use as input in pinmux spreadsheet?

6

No, I dit not use the Pinmux Spreadsheet as i had troubles using it.
Is there also a way to set the desired Pin as Input by directly editing the device tree?

Regards
Tim

7

NO.
Everything has to be done via the pinmux spreadsheet.
We don’t encourage directly modifying device tree about pinmux settings.

8

Okay. Thanks for the reply. I will give this a try. But I also never set the Pins to Output, or is this Default setting?

9

You should check the pin you want to use in that file.

10

I cant really find a good Instruction, on how to load the file generated by the Pinmux Spreadsheet. Can you help me with that

11

It’s here:
https://docs.nvidia.com/jetson/archives/r36.3/DeveloperGuide/HR/JetsonModuleAdaptationAndBringUp/JetsonAgxOrinSeries.html#mb1-configuration-changes

13

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