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→40 pin UART test
<li><p>As can be seen from the table below, the uarts available for Orange Pi 5 Plus are uart1, uart3, uart4, uart6, uart7 and uart8, a total of 6 sets of uart buses</p>
<p>[[File:media/image304.png|575x137px]]</p></li>
<li><p>The corresponding pins of the 6 groups of UART buses in 40pin are shown in the following table:</p></li></ol>
{| class="wikitable" style="width:800px;"
|-
| style="text-align: left;"| '''UART bus'''
| style="text-align: left;"| '''uart8-m1'''
|}
</ol>
<ol start="3" style="list-style-type: decimal;">
<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>
{| class="wikitable" style="width:800px;" |-|<p>orangepi@orangepi:~$ '''sudo orangepi-config'''</p>|}</li>
<li><p>Then select '''System'''</p>
<p>[[File:media/image234.png|403x186px]]</p></li>
</li>
<li><p>After entering the linux system, first confirm whether there is a device node corresponding to uart under /dev</p>
{| class="wikitable" style="width:800px;" |-|<p>orangepi@orangepi:~$ '''ls /dev/ttyS*'''</p>|}</li>
<li><p>Then start to test the uart interface, first use the DuPont line to short the rx and tx pins of the uart interface to be tested</p></li>
<li><p>Use the '''gpio serial''' command 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 (ttySX needs to be replaced with the node name corresponding to uart, please do not copy it)</p>
{| class="wikitable" style="width:800px;"
|-
|
<p>orangepi@orangepi:~$ '''sudo gpio serial /dev/ttySX'''</p>
<p>[sudo] password for orangepi: #enter password here</p>
<p>Out: 3: -> 3</p>
<p>Out: 4: -> 4</p>
<p>Out: 5: -> 5^C</p>|}</li></ol>
<span id="pwm-test-method"></span>
=== PWM test method ===
