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→40 pin UART test
<li><p>In the linux system, the UART in the 40 pin is closed by default, and it needs to be opened manually to use it. The detailed steps are as follows:</p>
<ol style="list-style-type: lower-alpha;">
<li><p>First run '''orangepi-config''', normal users remember to add > '''sudo''' permission</p>
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<li><p>Then select '''Hardware'''</p>
<p>[[File:media/image235.png|413x179px]]</p></li>
<li><p>Then use the arrow keys on the keyboard to navigate to the > position shown in the figure below, and then use the space to > select the UART configuration you want to open</p>
<p>[[File:media/image315.png|408x144px]]</p></li>
<li><p>Then select '''<Save>''' to save</p>
<li><p>Then select '''<Back>'''</p>
<p>[[File:media/image264.png|401x122px]]</p></li>
<li><p>Then select '''<Reboot>''' to restart the system to make the > configuration take effect</p>
<p>[[File:media/image239.png|320x141px]]</p></li></ol>
</li>