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→40pin UART test
<li><p>The main interface of wiringOP APP is displayed as shown in the figure below, and then click the '''UART_TEST''' button to open the UART test interface</p>
<p>[[File:media/image660.png|552x123px]]</p></li>
<li><p>The serial port test interface of the APP is shown in the figure below</p></li></ol>
[[File:media/image661.png|552x310px]]
</ol>
<ol start="5" style="list-style-type: decimal;">
<li>Take the test of '''UART3''' as an example below, select the '''/dev/ttyS3''' node in the selection box, enter the baud rate you want to set in the edit box, and then click the '''OPEN''' button to open the '''/dev/ttyS3''' node. After opening successfully, click the OPEN button becomes unselectable, and the '''CLOSE''' button and '''SEND''' button become selectable</li></ol>
[[File:media/image662.png|552x154px]]
</ol>
<ol start="6" style="list-style-type: decimal;">
<li><p>Then use Dupont wire to short the RXD and TXD pins of uart3</p>
<p>[[File:media/image663.png|455x121px]]</p></li>
<li><p>Then you can enter a character in the send edit box below, and click the '''SEND''' button to start sending</p></li></ol>
[[File:media/image664.png|553x155px]]
</ol>
<ol start="8" style="list-style-type: decimal;">
<li>If everything is normal, the received string will be displayed in the receiving box</li></ol>
[[File:media/image665.png|553x290px]]
</ol>
<span id="pin-spi-test-3"></span>
=== 26pin SPI test ===
