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→40pin UART test method
# As can be seen from the table below, the default uarts available in the Android12 TV system are uart2 and uart5. Please note that uart0 is set as a debugging serial port by default. Please do not use uart0 as a normal serial port.
<div style="display: flex;">::{| class="wikitable" style="width:390px;margin-right: 20px;text-align: center;"
|-
| '''GPIO序号GPIO NO.'''
| '''GPIO'''
| '''功能Function'''| '''引脚'''|| '''引脚'''| '''功能'''| '''GPIO'''| '''GPIO序号Pin'''
|-
| style="text-align: left;"|
| '''3.3V'''
| '''1'''
|-| '''264'''| '''PI8'''| '''TWI1-SDA'''| '''3'''|-| '''263'''| '''PI7'''| '''TWI1-SCL'''| '''5'''|-| '''269'''| '''PI13'''| '''PWM3'''| '''7'''|-| style="text-align: left;"|| style="text-align: left;"|| '''GND'''| '''9'''|-| '''<span style="color:#FF0000">226</span>'''| '''<span style="color:#FF0000">PH2</span>'''| '''<span style="color:#FF0000">UART5_TX</span>'''| '''<span style="color:#FF0000">11</span>'''|-| '''<span style="color:#FF0000">227</span>'''| '''<span style="color:#FF0000">PH3</span>'''| '''<span style="color:#FF0000">UART5_RX</span>'''| '''<span style="color:#FF0000">13</span>'''|-| '''<span style="color:#FF0000">261</span>'''| '''<span style="color:#FF0000">PI5</span>'''| '''<span style="color:#FF0000">UART2_TX</span>'''| '''<span style="color:#FF0000">15</span>'''|-| style="text-align: left;"|| style="text-align: left;"|| '''3.3V'''| '''17'''|-| '''231'''| '''PH7'''| '''SPI1_MOSI'''| '''19'''|-| '''232'''| '''PH8'''| '''SPI1_MISO'''| '''21'''|-| '''230'''| '''PH6'''| '''SPI1_CLK'''| '''23'''|-| style="text-align: left;"|| style="text-align: left;"|| '''GND'''| '''25'''|-| '''266'''| '''PI10'''| '''TWI2-SDA'''| '''27'''|-| '''256'''| '''PI0'''| style="text-align: left;"|| '''29'''|-| '''271'''| '''PI15'''| style="text-align: left;"|| '''31'''|-| '''268'''| '''PI12'''| '''PWM2'''| '''33'''|-| '''258'''| '''PI2'''| style="text-align: left;"|| '''35'''|-| '''272'''| '''PI16'''| style="text-align: left;"|| '''37'''|-| style="text-align: left;"|| style="text-align: left;"|| '''GND'''| '''39'''|}{| class="wikitable" style="width:390px;margin-right: 20px;text-align: center;"|-| '''Pin'''| '''Function'''| '''GPIO'''| '''GPIO NO.'''|-
| '''2'''
| '''5V'''
| style="text-align: left;"|
|-
| '''4'''
| '''5V'''
| style="text-align: left;"|
|-
| '''6'''
| '''GND'''
| style="text-align: left;"|
|-
| '''8'''
| '''UART0_TX'''
| '''224'''
|-
| '''10'''
| '''UART0_RX'''
| '''225'''
|-
| '''12'''
| style="text-align: left;"|
| '''257'''
|-
| '''14'''
| '''GND'''
| style="text-align: left;"|
|-
| '''16'''
| '''PWM4'''
| '''270'''
|-
| '''18'''
| style="text-align: left;"|
| '''228'''
|-
| '''20'''
| '''GND'''
| style="text-align: left;"|
|-
| '''232'''| '''PH8'''| '''SPI1_MISO'''| '''21'''|| '''<span style="color:#FF0000">22</span>'''| '''<span style="color:#FF0000">UART2_RX</span>'''| '''<span style="color:#FF0000">PI6</span>'''| '''<span style="color:#FF0000">262</span>'''
|-
| '''24'''
| '''SPI1_CS0'''
| '''229'''
|-
| '''26'''
| '''SPI1_CS1'''
| '''233'''
|-
| '''28'''
| '''TWI2-SCL'''
| '''265'''
|-
| '''30'''
| '''GND'''
| style="text-align: left;"|
|-
| '''32'''
| '''PWM1'''
| '''267'''
|-
| '''34'''
| '''GND'''
| style="text-align: left;"|
|-
| '''36'''
| style="text-align: left;"|
| '''76'''
|-
| '''38'''
| style="text-align: left;"|
| '''260'''
|-
| '''40'''
| style="text-align: left;"|
| '''259'''
|}
</div>
<ol start="2" style="list-style-type: decimal;">
<li>The device node corresponding to uart2 is '''/dev/ttyAS2''', and the device node corresponding to uart5 is'''/dev/ttyAS5'''</li>{| class="wikitable" style="width:800px;" |-| </olp> apollo-p2:/ # ls /dev/ttyAS*</p> <p>/dev/ttyAS0 /dev/ttyAS1 '''<span style="color:#FF0000">/dev/ttyAS2 /dev/ttyAS5</span>'''</p>|}</ol>
<ol start="3" style="list-style-type: decimal;">
<li>First open wiringOP APP on the desktop</li></ol>
[[File:zero2w-img351.png]]
</ol>
<ol start="4" style="list-style-type: decimal;">
<li>Then click the '''UART_TEST'''button to open the UART test interface</li></ol>
[[File:zero2w-img359.png]]
</ol>
<ol start="5" style="list-style-type: decimal;">
<li>The serial port test interface of wiringOP is as shown in the figure below</li></ol>
[[File:zero2w-img360.png]]
</ol>
<ol start="6" style="list-style-type: decimal;">
<li><p>Then select the '''/dev/ttyAS2''' or'''/dev/ttyAS5''' node in the selection box</p>
<p>[[File:zero2w-img361.png]]</p></li>
<li><p>Enter the baud rate you want to set in the edit box, and then click the '''OPEN''' button to open the uart node. After the opening is successful, the '''OPEN''' button becomes unselectable, and the '''CLOSE''' button and '''SEND''' button become selectable.</p></li></ol>
[[File:zero2w-img362.png]]
</ol>
<ol start="8" style="list-style-type: decimal;">
<li><p>Then use Dupont wire to short the rx and tx pins of uart</p></li>
<li><p>Then you can enter a paragraph of characters in the send edit box below and click the '''SEND''' button to start sending.</p></li></ol>
[[File:zero2w-img363.png]]
</ol>
<ol start="10" style="list-style-type: decimal;">
<li>If everything is normal, the received string will be displayed in the receiving box</li></ol>
[[File:zero2w-img364.png]]
</ol>
<span id="pin-spi-test-method"></span>
=== 40pin SPI test method ===
