DSBOX-NX2 (Rev. 1.1) CANBus Interface Tutorial

DSBOX-NX2 (Rev. 1.1) CANBus Interface Tutorial

Jetson Xavier NX

20 May 2021
WHAT YOU WILL LEARN?

1- The pinout of I/O connector  

2- Example of an CANBus application 

3- Examples of can-utils tools 


ENVIRONMENT

Hardware: DSBOX-NX2 (Rev. 1.1)

OS: JetPack 4.5 (L4T-32.5)


This blog post is suitable for:


• NVIDIA Jetson Xavier NX SOM with DSBOARD-NX2 (Rev. 1.1) Carrier Board

• DSBOX-NX2 (Rev. 1.1)


 In this blog post, we will test the CANBus interface of DSBOX-NX2.



First, let's look at the I/O connector. On the connector, there are 2 pins for CAN Bus and 1 pin for isolated ground. When using CAN Bus always double check which ground pin you are using. You must use digital ground for CAN Bus applications.


To test CAN Bus functionality, we used USB-CAN adapter. Connect that adapter to the USB port of the host PC and install its driver software if necessary. To the other side of the adapter, connect your device’s CAN pins.


On next step, activate CAN drivers and activate CAN interface with “ip link” command. On host side, be sure that you are using same bitrate with your device.


sudo busybox devmem 0xc303000 32 0x0000c400
sudo busybox devmem 0xc303008 32 0x0000c450
sudo modprobe can
sudo modprobe can-raw
sudo modprobe mttcan
sudo ip link set can0 up type can bitrate 500000


Lastly, you can use can-utils tools to communicate.

Use cangen to write random data:


cansend can0 123#1122334455667788




Use cansend to write data:

cansend can0 123#1122334455667788




Use candump to listen bus:




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cansend can0 123#1122334455667788
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