How to connect SPI on Jetson Nano B01 Dev Kit, version from January 2023

Hi team,
I use Jetpack version 4.6-b199.
Jetson Nano B01 Dev Kit (I use the hardware Dev Kit version from January 2023).

My setup on Jetson Nano B01:
From the instructions, first fix the init functions:
$ sudo find /opt/nvidia/jetson-io/ -mindepth 1 -maxdepth 1 -type d -exec touch {}/ ;

Run and Enable SPI1.
$ sudo /opt/nvidia/jetson-io/
Check configured the spi pinmux:
$ sudo cat /sys/kernel/debug/tegra_pinctrl_reg | grep -i spi
$ sudo cat /sys/kernel/debug/tegra_gpio
$ ls /dev/spidev*

Install libraries and software:

$ sudo apt-get update
$ sudo apt-get -y install python3-pip
$ pip3 –version
$ sudo pip3 install Jetson.GPIO
$ sudo apt-get install python-dev
$ sudo apt-get install python3-dev
$ sudo apt-get update
$ sudo apt-get install git
$ git clone GitHub - doceme/py-spidev
$ cd py-spidev
$ sudo apt-get install -y python-setuptools
$ sudo apt-get install -y python3-setuptools
$ sudo python install
$ sudo python3 install
$ sudo modprobe spidev

Previously when I used this setup with older versions of Jetson Nano B01 Dev Kit, SPI worked fine, but when I set up and tested with versions from January 2023, SPI didn’t work.
Can you guide me how to fix it?
Thank you so much!

My python code for test SPI:

import spidev
import time
import binascii

spi = spidev.SpiDev() # Tạo đối tượng cho SPI, 0) # mở port 0, device (CS) 0
spi.max_speed_hz = 500000

while True:
resp = spi.xfer2([0x61,0x62,0x63,0xA]) # [‘a’,‘b’,‘c’,‘\n’]
time.sleep(1) # sleep for 1 seconds
except KeyboardInterrupt:

Hi phamxuanvi93,

Please help to share the result of the following command for Jetpack version in use

$cat /etc/nv_tegra_release

Your result seems unexpected. Do you save the pinmux configuration in Jetson-IO and reboot the board to apply?

Could you help to refer the following thread step-by-step for SPI loopback test?
Jetson Nano SPI Bus Not Working - #10 by KevinFFF

Hi @KevinFFF ,

I apologize for not describing the images the check result of this command was taken after rebooting the Jetson Nano B01.

  • I will read more about the SPI loopback test and give you more feedback.
    Looking forward to hearing from you soon!

Hi @KevinFFF ,
Can you guide me in more detail for step 2?
Thank you so much!

Hi @KevinFFF ,
The result of SPI loopback test.