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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.
::{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big>'''For better compatibility, it is recommended to use CH340 USB to TTL module, please do not use CP2102, PL2303 type USB to TTL module.'''
'''Before purchasing a USB to TTL module, please confirm that the module supports a baud rate of 1500000.'''</big>|}
<div class="figure">
::[[File:media/image183.png|576x115px|07]]
</div>
<ol style="list-style-type: lower-alpha;">
<li><p>The GND of the USB to TTL module is connected to the GND of the > development board</p></li>
<li><p>The '''<span style="color:#FF0000">RX</span>''' of the USB to TTL module is '''<span style="color:#FF0000">connected to the TX of > the development board</span>'''</p></li><li><p>The '''<span style="color:#FF0000">TX</span>''' of the USB to TTL module is '''<span style="color:#FF0000">connected to the RX of > the development board</span>'''</p></li></ol>
</li>
<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>
</div>
{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big><p>'''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. If there is no output in the test, then exchange the order of TX and RX, so that there is always a This order is correct.'''</p></big>|}</li></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 ===
