Bootloader Shell in Jetson image while using Serial port

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

issues with connecting pixhawk through serial port
I am trying to connect pixhawk 2.4.8 with Jetson Xavier NX serial port ttyTHS1.
I have ensured the connections are proper and referred through serial port issue .

IMG_20200918_143107
IMG_20200918_1431074000×3000 3.95 MB

I disabled the nvgtty

$ systemctl stop nvgetty
$ systemctl disable nvgetty

and restarted NX, i am seeing image of BOOTLOADER SHELL like display.

IMG_20200918_141950
IMG_20200918_1419504000×2250 2.9 MB

If i disconnect port and connect once after it gets booted, Its not showing any serial connection info.

sudo stty -F /dev/ttyS1 -a

I am new to Jetson, used to use only raspberryPI ,
Can somebody share the solution or at least guide me the possible ways to utilize the Serial port .

Thanks.

BOOTLOADER SHELL

3

hello nagakiran224,

could you please access NX Developer Kit User Guide for the J14 pin descriptions to review your pin connections. you should connect to pin-3 and pin-4 respectively for UART receive and send.
if you checking NX Product Design Guide, that’s general used for debug console.

please also refer to similar discussion thread, Topic 145106 to change debug console.
thanks

1 Like
4

Thanks for your response @JerryChang
Actually, I have referred through the NX Product Design Guide

image
image635×654 28.1 KB

pins 8 and 10 are referring to UART port.

I have connected these pins respectively and checked with reversing as well.
but could’t get any response in the console for the specific port info :-(

Checked other visible ports also :-|

naga@naga:~$ sudo stty -F /dev/ttyTHS0 -a
speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V;
discard = ^O; min = 1; time = 0;
-parenb -parodd -cmspar cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc -ixany -imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke -flusho -extproc
5

hello nagakiran224,

FYI, the default baudrate setting is 115200/8n1.

6

Thanks @JerryChang,
Its working fine .
Thanks for your support :)