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→40 Pin's UART test
<li><p>In the Linux system, the UART in 40 pin is closed by default, and it needs to be opened manually to use. The detailed steps are shown below：</p>
<ol style="list-style-type: lower-alpha;">
<li><p>First add the following configuration to > the'''/boot/extlinux/extlinux.conf'''</p>{| class="wikitable" style="width:800px;" |-|
<p>[orangepi@orangepi ~]$ '''sudo vim /boot/extlinux/extlinux.conf'''</p>
<p>LABEL Orange Pi</p>
<p>LINUX /Image</p>
<p>FDT /dtbs/rockchip/rk3588-orangepi-5-plus.dtb</p>
<p>'''<span style="color:#FF0000">FDTOVERLAYS /dtbs/rockchip/overlay/rk3588-uart1-m1.dtbo</span>'''</p>|}<p>The red font demonstrates the configuration of the '''uart1-m1'''. The other configurations are shown in the table below, and the corresponding dtbo configuration can be added behind '''<span style="color:#FF0000">FDTOVERLAYS</span>'''</p></li></ol></li></ol>
{| class="wikitable" style="width:800px;"
|-
| style="text-align: left;"| '''UART bus'''
| style="text-align: left;"| '''/dtbs/rockchip/overlay/rk3588-uart8-m1.dtbo'''
|}
</ol>
<ol start="2" style="list-style-type: lower-alpha;">
<li>Then '''<span style="color:#FF0000">Then restart the OPI OS Arch system</span>'''</li></ol></li></ol>
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<ol start="3" style="list-style-type: decimal;">
<li><p>After entering the Linux system, first confirm whether there is a device node corresponding to UART under the'''/dev'''</p>{| class="wikitable" style="width:800px;" |-|<p>[orangepi@orangepi ~]$ '''ls /dev/ttyS*'''</p>|}</li><li><p>Then start testing the UART interface, and first use the RX and TX pins of the UART interface to be tested by DuPont</p></li></ol>
{| class="wikitable" style="width:800px;"
|-
| style="text-align: left;"| '''UART bus'''
| style="text-align: left;"| '''No. 35 pin'''
|}
</ol>
<ol start="5" style="list-style-type: decimal;">
<li><p>Use the '''gpio serial''' command to test the loop function of the serial port as shown below. If you can see the printed below, it means that the serial port communication is normal (TTYSX needs to be replaced with a 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 the password here</p>
<p>Out: 0: -> 0</p>
<p>Out: 1: -> 1</p>
<p>Out: 3: -> 3</p>
<p>Out: 4: -> 4</p>
<p>Out: 5: -> 5^C</p>|}</li></ol>
<span id="pwm-test-method-1"></span>
=== PWM test method ===