Hi. So the long story short: I use Nano as a logic centre for a few microcontrollers, for testing and self-studying processes. So I’ve decided to connect them by UARTS. Luckily, Nano has enough. The Problem: Custom application on Linux starts with sending a request via ttyTHS2 to STM32 for any…

Any UART which is not bound to the login software (getty or agetty) is a non-console. As Jetsons ship there is only one UART set up as a serial console. None of those setups are part of the kernel, although the kernel has a UART driver. What makes it change to group “tty” is not the kernel, it is ou…

A regular user should not be in group tty. Most of what you have described is the correct procedure. However, at the Jetson side, is it possible for you to run a serial console program on that TTY? Combine this with unplugging the cable at the remote end, and shorting the TX and RX (which puts this…

@linuxdev . Hi, i`m glad for your answer!. I deleted dev from the tty-group. Just to be sure in the future; Shorting: Sending via echo -ne ‘01234’ > /dev/ttyTHS* and capturing with sudo putty -serial /dev/ttyTHS* UART2 TX to RX (loop): → FAIL (checked for both TX-s) UART1 TX to RX (loop): →…

Did you literally use “/dev/ttyTHS*” with echo? This won’t work, I was just suggesting to use this with “ls”, and it is good for listing all serial devices with the NVIDIA “Tegra High Speed” driver (which produces files of the naming convention “/dev/ttyTHS#”, if “#” is a number). Using it with echo …

Hi, @linuxdev . Apologies for the long absence! You were right. My initial check was relatively ineffective… This time, i used your setup: Jetson NANO: gtkterm -b 8 -t 1 -s 115200 -p /dev/ttyTHS# , # = 1,2 PC with Termite 3.4+TTL (easier than modifying STM code): (sending string) 12345 Wh…

Note that each UART is compatible with legacy drivers (naming “ttyS#”). However, the UARTs on the Jetson also have DMA capability if the “Tegra High Speed” driver is used (naming “ttyTHS#”). In reality there is one device file for each UART driver. It is unusual for a single device to have multiple…

I read about ttyS# and ttyTHS# origins in one of your answers, but it`s kind of unobvious. My code uses 2 ports UART1-2 simunteneously, therefor i left 2 choices “/dev/ttyTHS1-2”. Each port(fd) initialization is almost immediate with my application. The init runs smooth but in the end, UART2 sends …

You cannot comment out something from “/proc/device-tree”, at least not directly. This is just the kernel pretending to be a directory tree, and is in RAM, reflecting the current tree, but not capable of being used to modify the tree. I would not recommend actually commenting out the “compatible” p…

Ok, so i have decompiled /boot/dtb/tegra210-p3448-0000-p3449-0000-b00.dtb and created similar file ./tegra210-p3448-0000-p3449-0000-b00-custom.dtb then changed FDT in ./extlinux.conf to refer newly created/modified file. The only modification was in serial@70006000::compatible. Specifically, i left …

If the non-THS driver is removed from a UART, then the ttyS# syntax file should go away, but this won’t help you. I’ll also suggest that those are the drivers allowed (the “compatible” is a list of candidate drivers for that device at that physical address). Removing the non-THS driver would have no…

Correct me if i am wrong, but as far as i can see, it’s better to activate ttyS0 back. At least for DEBUG functionality and at best i won’t meet any following troubles. Speaking of my main situation, i highly doubt about power level, because STM and NANO are connected via 3 wires (TX/RX/GND). Whil…

Why i receive data in /ttyTHS1 while i connect external device to /ttyTHS2 in Jetson NANO?

Robotics & Edge Computing Jetson Systems Jetson Nano

zoidberg724 October 5, 2022, 1:08pm 14

Well, i found one thread. Lucky for me, it’s exactly what i need!

The only things i need to clarify are:

Is it possible to mix ports ttyS0 with ttyS2?
Change in tegra210-…-b00.dtb(.dts) → the one that is referd in extling.conf?
What troubles i can get in the observable future? :)

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Why i receive data in /ttyTHS1 while i connect external device to /ttyTHS2 in Jetson NANO?

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