Not able to access/find /dev/ttyTHS0 on Jeton Orin Nano Devkit - NVIDIA Official Board

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

I am trying to access /dev/ttyTSH0 using 3-wire UART wires (TX, RX and Ground) - Pin 9 -GND, 8-UART1_TX, 10-UART1_RX but I am not able to find the port for UART1. On nano I get this output for command ls -l /dev | grep ttyTHS

crw-rw---- 1 root dialout 240, 1 Nov 22 2023 ttyTHS1
crw-rw---- 1 root dialout 240, 2 Nov 22 2023 ttyTHS2

I have also attached dmesg log.
dmesg_log.txt (61.9 KB)

3

Hi jalayrupera13,

Are you using the devkit or custom board for Orin Nano?

[    0.000000] kernel: Linux version 5.15.136-tegra (buildbrain@mobile-u64-6367-d8000) (aarch64-buildroot-linux-gnu-gcc.br_real (Buildroot 2022.08) 11.3.0, GNU ld (GNU Binutils) 2.38) #1 SMP PREEMPT Mon May 6 09:56:39 PDT 2024 ()

It seems you are using JP6.0GA (K5.10.136).

[    3.810660] kernel: 3100000.serial: ttyTHS1 at MMIO 0x3100000 (irq = 112, base_baud = 0) is a TEGRA_UART

To access the UART from PIN8/PIN10 of 40 pin-header, it is the node /dev/ttyTHS1 in JP6.

4

Hi Kevin,

Thanks, changing the port from /dev/ttyTHS0 to /dev/ttyTHS1 worked. I am using the official devkit. Also, Is there any documentation available for JP6 or Orin Nano to find these serial port mapping?

5

There’s no document for the device node mapping for UART.
They are defined in device tree. You can check the device tree for the aliases and know how it configures the serial@3100000.
For the Jetpack 5, you can refer to Mapping.
For the Jetpack 6, I will also add more info on that page.

6

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