ORANGE Pi 3B - Page 221

range Pi User Manual Copyright reserved by Shenzhen Xunlong Software Co., Ltd
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g. Then select <Reboot>to restart the system to make the configuration take effect
3) After entering the Linux system, first confirm whether there is a device node
corresponding to uart under /dev
orangepi@orangepi:~# ls /dev/ttyS*
/dev/ttyS1 /dev/ttyS3 /dev/ttyS7 /dev/ttyS9
4) Then start to test the uart interface, first use the DuPont line to short the rx and tx of
the uart interface to be tested
uart3
uart7
uart9
tx Pin
Corresponding to
the 28 pin
Corresponding to
the 16 pin
Corresponding to
the 29 pin
rx Pin
Corresponding to
the 27 pin
Corresponding to
the 15 pin
Corresponding to
the 22 pin
5) Use the serialTest.py program in the examples to test the loopback function of the
serial port as shown below. If you can see the following print, it means that the serial port
communication is normal