NX GPIO not working with Jetson NX Dev Kit

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
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1

I writing a C++ program that will run on the NX using the Dev Kit board. I want to run headless and give the operator status information with LEDS driven by GPIO from the 40 pin header.

I have tried following the advice in the post How to config gpio07 as gpio - #4 by JerryChang and How to Enable GPIO7 and GPIO14 as PWM8 and PWM7 on Xavier-Nx module - #23 by shgarg
with little luck.

The NX I am developing with shows no activity on the pins. I can export, set direction, and value through the command line without errors, but an oscope on the pins stays flat.

I tried a fresh install on a second NX and microSD, but I can only get pin32/gpio07 (424 as calculated and listed in a post) to toggle high and low NOT:
pin7/gpio09 (432 as calculated)
pin31/gpio11 (416 as calculated and listed in a post)
pin15/gpio12 (264 as calculated)

Is there something beyond the export, direction, and value writing that needs to be done to use the GPIO pins with the Dev kit?

3

hello nhschafer,

there’s default pin configurations.
you’ll need to access pinmux spreadsheets to have customization to generate cfg files, and re-flash the board to update the board.

you may also refer to [url]https://github.com/NVIDIA/jetson-gpio[/url], a Python library that enables the use of Jetson’s GPIOs.
thanks