I have no problems opening the spidev1.0 and sending a string to it without errors, but I see no activity on any SPI pins. (I did configure the GPIO for SPI using the jetson-io.py utility.) Any suggestions on what could the issue?

For Jetson Nano, you have to rebuild dtb and reflash the board to apply the change. Please refer to NVIDIA Jetson Linux Developer Guide : Jetson Module Adaptation and Bring-Up | NVIDIA Docs for details.

Problem Getting SPI Working on Jetson Nano

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano

KevinFFF February 10, 2025, 3:18am 5

I would suggest you verifying on the devkit for all related operations first.
Please refer to Jetson Nano SPI Bus Not Working - #10 by KevinFFF for the steps to verify SPI loopback test on Jetson Nano.

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Problem Getting SPI Working on Jetson Nano

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