Jetson Orin Nx UART0

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
1

I’m trying to use UART0 on Jetson orin nx and using picocom to get message and nothing is received despite seeing a signal being received on the oscilloscope is it disabled by default or how to enable it for general use

3

Hi eslam.emara1999,

Are you using the devkit or custom board for Orin NX?
What’s the Jetpack version in use?

Have you tried to short UART-TX and UART-RX to perform loopback test?
Please share the full dmesg for further check.

4

Hi, I’m using a custom board for orin NX with the latest jetpack 6.2
i haven’t tried the loopback i don’t have the required connectors for it yet , i have attached the dmesg output
log.txt (63.2 KB)

5

I have made the loopback test and it doesn’t echo also

6

You can simply short them(TX/RX) with a cable.

Do you run the following command for the loopback test?

$ sudo su
# stty -F /dev/ttyTHS1 115200 raw -echo
# cat /dev/ttyTHS1 &
# echo "test" > /dev/ttyTHS1

What’s the UART0 do you mean?
Is it the one from 40-pins expansion header? Or the one from M.2 Key E?

7

Thanks for your reply, i was trying to use UART0 which maps to uartB/UART2 on the M.2 Key E, i figured out a solution i had to modify the dtb to include the following

serial@3110000 {
			resets = <0x03 0x65>;
			interrupts = <0x00 0x71 0x04>;
			clocks = <0x03 0x9c>;
			compatible = "nvidia,tegra194-hsuart";
			reset-names = "serial";
			status = "okay";
			reg = <0x00 0x3110000 0x00 0x10000>;
		};
		
serial3 = "/bus@0/serial@3110000";
uartb = "/bus@0/serial@3110000";

right now it’s working fine and found on THS3

8

Yes, it could be used through /dev/ttyTHS3 since you’ve configured the aliases “serial3” for serial@3110000 hree