Jetson Nano SPI not working

[mucahit.unal]

Hi all,

I am trying to open SPI communication port on Jetson Nano but I could not be successful. I can see this :

ls /dev/spi*
/dev/spidev0.0 /dev/spidev0.1 /dev/spidev1.0 /dev/spidev1.1

How can i tell if spi port is opened successfully or not ? I am connected MOSI (19) of SPI1 to MISO (21). Then i am tried this :
SPI Test

$ sudo ./spidev_test -D /dev/spidev1.1 -v -p “HelloWorldtesstt” -s 50000
spi mode: 0x0
bits per word: 8
max speed: 50000 Hz (50 KHz)
TX | 48 65 6C 6C 6F 57 6F 72 6C 64 31 32 33 34 35 36 37 38 39 61 62 63 64 65 66 __ __ __ __ __ __ __ | HelloWorldtesstt
RX | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 __ __ __ __ __ __ __ | …

I can’t see anything on the RX line. Please let me know if you have any solution for this issue.

[KevinFFF]

Hi mucahit.unal,

Are you using the devkit or custom board for Jetson Nano?
What’s your Jetpack version in use?

Please refer to the following thread to verify SPI loopback test step-by-step.
Jetson Nano SPI Bus Not Working - #10 by KevinFFF

[mucahit.unal]

Hi KevinFFF,

First of all, thank you for your feedback. I am using devkit for Jetson Nano. I checked my jetpack version :

it is 4.6.3 . I clicked to the link you sent, but I couldn’t do step 2. How can i remove GPIO usage of SPI pins ? I checked flash log dmesg for dtb : tegra210-p3448-0000-p3449-0000-b00.dts

Also i tried :

sudo /opt/nvidia/jetson-io/jetson-io.py

but does not work, suddenly crashed.

[KevinFFF]

@mucahit.unal

I couldn’t do step 2. How can i remove GPIO usage of SPI pins ?

You could refer to the following thread to modify this through dissembling the dtb.
Problem with SPI in Jetson Nano - #14 by KevinFFF

@mucahit.unal

but does not work, suddenly crashed.

Is there any error message when you run Jetson-IO?