Serial log shows garbled characters

[donglinhui2006]

Using TX2 NX core board, Linux Jetson version: R32.7.1, serial terminal configuration: set to speed 115200, 8 bits, no parity, and 1 stop bit, when booting, the serial interface displays garbled characters, do you need the software to open the serial port log switch?

[linuxdev]

Any serial console program works. My favorite is “gtkterm” (“sudo apt-get install gtkterm”). Example use:
gtkterm -b 8 -t 1 -s 115200 -p /dev/...serial port...

If this shows up but is garbled, then it might be you have a cable designed for a different voltage. Are you certain your cable uses 3.3V TTL logic level? Also, how much of the cable length is unshielded? A typical USB cable is USB for most of its length, and that cable length is not an issue; however, the wires where it breaks out into separate wires should be kept short, and if the length is more than a few inches, then it should have the TX and RX as a twisted pair.

I almost forgot: If your character set on the host PC is significantly different than those on the Jetson (UTF-8), then it might be working as expected, but translating characters wrong. On the host side, what do you see from “echo $LANG”? If it isn’t “UTF-8”, then you might run this command before running the serial console app:
export LANG=en_US.UTF-8

[donglinhui2006]

Now the serial port output is normal, it is caused by the wrong interface connected by my serial port cable, thank you very much! !