External device serial port communication

1. Preparation

This section tests the serial port's self-transmitting and receiving functions of Jetson Nano. The serial port device number of Jetson Orin NX and Jetson Orin Nano motherboards needs to be modified to /dev/ttyTHS0.

From the figure below, you can see that the TXD and RXD pins of the serial port of JETSON NANO correspond to physical pins 8 and 10 respectively.

Wiring: JETSON NANO pin 8 (TXD) → JETSON NANO pin 10 (RXD)

2. Use the routine to test the serial port function

Download a serial port communication case from github. The source code and explanation can be viewed at this github link

git clone https://github.com/JetsonHacksNano/UARTDemo

Enter the folder

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cd UARTDemo

If you do not plan to use the serial console on the UART, you should disable the serial console (it depends on your choice):

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systemctl stop nvgetty
systemctl disable nvgetty
udevadm trigger

Install serial module

 Control LED
I2C communication