UART3 TX is not working

[Edward Sargsyan]

Hello. Somehow TX on UART 3 is not working. I connected USB-UART converter or the Banana Pi Zero M2 UART 3 Pins (as it shown here https://bananapi.gitbook.io/bpi-m2/en/bpi-m2_gpio_pin_define), set Baud rate, but I can't send anything from the SBC to PC. But I can send messages from PC to Banana pi. The converter is working properly(tested on Arduino). Do you have any ideas why? Physically nothing looks damaged, wires are soldered accurately and correctly....

 

Some system info

$ uname -r
6.1.2-sunxi

$ cat /etc/os-release 
PRETTY_NAME="Armbian 23.02.0-trunk Jammy"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.1 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

$ cat /boot/armbianEnv.txt | grep overlay
overlay_prefix=sun8i-h3
overlays=uart2 uart3

 

[Werner]

Providing logs with 

armbianmonitor -u

 helps with troubleshooting and significantly raises chances that issue gets addressed.