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→Connection instruction of debugging serial port
# First, you need to prepare a 3.3v USB to TTL module, and then insert the USB interface end of the USB to TTL module into the USB interface of the computer
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<li>The corresponding relationship between GND, TX and RX pins of the debugging serial port of the development board is shown in the figure below</li></ol>
[[File:media/image61.png|328x185px]]
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<li><p>The GND, TX and RX pins of the USB to TTL module need to be connected to the debugging serial port of the development board through a DuPont line</p>
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<li><p>Connect the GND of the USB to TTL module to the GND of the development board</p></li>
<li><p>The RX of the USB to TTL module is '''<span style="color:#FF0000">connected to the TX of the development board</span>'''</p></li><li><p>Connect the TX of the USB '''<span style="color:#FF0000">to TTL module to the RX of the development board</span>'''</p></li></ol>
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<li><p>The schematic diagram of connecting the USB to TTL module to the computer and the Orange Pi development board is as follows</p></li></ol>
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{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big>'''The TX and RX of the serial port need to be cross-connected. If you don’t want to carefully distinguish the order of TX and RX, you can connect the TX and RX of the serial port casually first. If there is no output from the test serial port, then exchange the order of TX and RX. One order is right.'''</big>|}</ol><span id="how-to-use-the-debugging-serial-port-on-the-ubuntu-platform"></span>
=== How to use the debugging serial port on the Ubuntu platform ===
