Serial Communication issue with AGX Xavier

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

Hi,
We have used L4T 32.4.3 BSP and customized it for our carrier board, I am facing some issue with Serial as It was working fine with earlier BSP (L4T 32.4.1) with same carrier board.
there are 4 tty nodes ttyTHS0,ttyTHS01,ttyTHS04,ttyTHS06.
If I transfer data as below, I am seeing these behaviors:
Observation:
ttyTHS0 → ttyTH1 :no data
ttyTHS1 → ttyTH0 : echoed in 1

ttyTHS4 → ttyTH6 :echoed in 4
ttyTHS6 → ttyTH4 : echoed in 6

AGX Xavier to external node/ laptop via Tera term using serial to USB

tera term → ttyTHS0 : no data
ttyTHS0 → tera term :no data

tera term → ttyTHS1 : OK but sometime it is getting echoed
ttyTHS1 → tera term :OK

Can you please suggest on this?

3

hello venkatraman.bhat

we don’t have l4t-r32.4.1 release; please check JetPack Archive for confirmation.
you may looking into kernel messages ($ dmesg | grep ttyTHS) and pinmux configuration file (tegra19x-mb1-pinmux-p2888-0000-a04-p2822-0000-b01.cfg) for the mappings for serial ports of ttyTHS*, and UART*,
thanks

4

Hey sorry for that, Our earlier BSP was from L4T 32.3.1 and current BSP is on L4T 32.4.3

5

hello venkatraman.bhat

had you refer to kernel messages, i.e. $ dmesg | grep ttyTHS to check those register ports?
please check the mappings to confirm which UART is failed.
thanks