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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
<br />
== Summary ==<br />
Technical guide for configuring SPI, CAN and RS485 on the Waveshare expansion board for the NVIDIA Jetson Nano.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL22026 WSAL22026 – RS485 CAN Expansion Board for Jetson Nano, Digital Isolation, Built-In Protection Circuit]<br />
<br />
== Technical overview ==<br />
* The board includes an MCP2515 CAN controller over SPI and an SP3485 RS485 transceiver over UART.<br />
* A standard 40-pin GPIO header allows direct attachment to the Jetson Nano.<br />
* Digital isolation circuitry and TVS protection improve stability and guard against surge voltages.<br />
* SPI must be enabled by modifying the device tree; updating only the dtb partition is not supported, so a full system re-flash is required.<br />
* CAN demo: connect the hardware module, then run cantest.py at a 500 Kbps baud rate.<br />
* RS485 demo: connect the hardware module, ensure UART is free, and run rs485test.py.<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
sudo apt-get install minicom<br />
sudo apt-get install python-pip nano<br />
sudo pip install pyserial<br />
sudo pip install spidev==3.1<br />
sudo mkdir sources_nano<br />
cd sources_nano<br />
sudo mv ~/Downloads/Jetson-210_Linux_R32.7.2_aarch64.tbz2 ~/sources_nano/<br />
sudo mv ~/Downloads/Tegra_Linux_Sample-Root-Filesystem-R32.7.2_aarch64.tbz2 ~/sources_nano/<br />
tar -xjf Jetson-210_Linux_R32.7.2_aarch64.tbz2<br />
cd Linux_for_Tegra/rootfs/<br />
tar -xjf ../../Tegra_Linux_Sample-Root-Filesystem-R32.7.2_aarch64.tbz2<br />
cd ../<br />
sudo ./apply_binaries.sh<br />
sudo apt-get install -y device-tree-compiler<br />
cd kernel/dtb<br />
sudo dtc -I dtb -O dts -o tegra210-p3448-0002-p3449-0000-b00.dts tegra210-p3448-0002-p3449-0000-b00.dtb<br />
sudo cp tegra210-p3448-0002-p3449-0000-b00.dts tegra210-p3448-0002-p3449-0000-b00-bak.dts<br />
sudo nano tegra210-p3448-0002-p3449-0000-b00.dts<br />
sudo dtc -I dts -O dtb -o tegra210-p3448-0002-p3449-0000-b00.dtb tegra210-p3448-0002-p3449-0000-b00.dts<br />
sudo ./flash.sh jetson-nano-emmc mmcblk0p1<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* Device tree modifications are version-sensitive (verified for JetPack 4.6.2). Mistakes may prevent the system from booting.<br />
* Updating only the dtb partition is not supported; a full system re-flash is required.<br />
* Boot configuration must be redone after flashing.<br />
* Ensure UART is not in use before running the RS485 demo.<br />
* The maximum supported CAN baud rate is currently 500 Kbps; higher rates such as 1000 Kbps are not supported.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/RS485_CAN_for_Jetson_Nano RS485 CAN for Jetson Nano - Waveshare Wiki]<br />
* Source revision: 104305<br />
* Captured: 2026-09-03T03:34:45+00:00<br />
* SHA-256: <code>cda9e85e24eb2fc87ed274a94565205f30936a8341ea812737f659be788f7eb8</code></div>JWTechPublisher