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OrangePi Zerro 2, using the UART at pin8 and pin10

hazi
in Beginners

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I would like to use the uart of the orangepi zero 2 for an application. It esists for example /dev/ttyS5. But unfortunately the communication does not work. When I connect minicom to this port and short the two pins 8 and 10, I wanted to see the characters that are sent. Minicom can be connected (minicom -D /dev/ttyS5). But the characters are not mirrored. Do I need to enable the UART before? How to do this? The orangepi-config program does not exist on the system.
The system reports after the login with: Welcome to Orange Pi 3.0.6 Bullseye with Linux 5.16.17-sun50iw9
Thank you for your thoughts.

 

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