I connected pins 19 and 21 on the J41 expansion header and ran the SPI loopback test as described here. I get 00’s in readout.
I did try to enable SPI following this guide, but I assume I might’ve done something wrong at some point.
- Ran /opt/nvidia/jetson-io/jetson-io.py to configure the J40 expansion header and exported the new device tree overlay.
- Compiled the device tree overlay with
dtc -I dtb -O dts -o my-overlay.dts /boot/tegra210-p3448-0000-p3449-0000-b00-user-custom.dtbo
dtc -O dtb -o my-overlay.dtbo -@ my-overlay.dts
- Put the my-overlay.dtbo file in /boot and rebooted.
In addition to SPI still not working, the jetson-io.py configuration tool now shuts down a second or two after launch.
I take it there’s a way to properly enable SPI in JetPack 4.4, but I can’t seem to find out how.