Unable to use UART1

[KLUSEK]

Hi eveyrone
I just got my Nano and for a project I planned to used I wanted to make use of UART1 to communicate.

So, for testing purposes I used one of those USB to TTL converters and my laptop.

Following below pinout I've connected to UART1 RX, TX and Ground, double checking that I'm connecting it in TX<->RX manner.

But nothing really happens.
What I tried:
WebUI and /dev/ttyS1 and /dev/ttyS2, but I though maybe I don't know how to use picocom.
so I logged in into shell and tried to send some data to my laptop using python and shell like that:

ser = serial.Serial('/dev/ttyS1', 115200)
ser.write(b'Hello')
ser.close()

stty -F /dev/ttyS1 115200 cs8 -cstopb -parenb
echo "Test" > /dev/ttyS1

But it remained silent.
Then I tried to connect to UART0, which supposed to be system log printout and it worked right away.
Then I connected to UART2 and it started to work also.

At the final attempt I connected osciloscope to UART1 TX pin, but could not registed any signals.

Do you know why my UART1 does not working properly?
Or how to debug that problem?

[azbesthu]

Did you connected pins correctly? I just asking, because S1 and S2 are not in the same order.
I have two nanoKVM lite. One of them configured to use S1 and the other one uses S2 with python scripts.
They are working fine for me (1.3.0 base image + updated application).
Which image version do you have?

Wait a minute.... where did you find that image of the pinout?
The main github page has a similar image and that has different pinout for S1
https://github.com/sipeed/NanoKVM

Hmm.. it seems the wiki page hase two different pinout for the english and chinese pages :)
https://wiki.sipeed.com/hardware/zh/lichee/RV_Nano/1_intro.html

[KLUSEK]

😶‍🌫️

That's a good catch! I can't remember where I got pinout image exactly, but this is interesting.
I'm abroad now, but on next weekend I will confirm if that was it.

Thanks again!