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→40pin SPI test
# As can be seen from the table below, the spi available for the 40pin interface is spi1, and there are two chip select pins cs0 and cs1
<div style="display: flex;">::{| class="wikitable" style="width:390px;margin-right: 20px;text-align: center;"
|-
| '''GPIO NO.'''
| '''Function'''
| '''Pin'''
|-| style="text-align: left;"|| style="text-align: left;"|| '''3.3V'''| '''1'''|-| '''264'''| '''PI8'''| '''TWI1-SDA'''| '''3'''|-| '''263'''| '''PI7'''| '''TWI1-SCL'''| '''5'''|-| '''269'''| '''PI13'''| '''PWM3/UART4_TX'''| '''7'''|-| style="text-align: left;"|| style="text-align: left;"|| '''GND'''| '''9'''|-| '''226'''| '''PH2'''| '''UART5_TX'''| '''11'''|-| '''227'''| '''PH3'''| '''UART5_RX'''| '''13'''|-| '''261'''| '''PI5'''| '''TWI0_SCL/UART2_TX'''| '''15'''|-| style="text-align: left;"|| style="text-align: left;"|| '''3.3V'''| '''17'''|-| '''<span style="color:#FF0000">231</span>'''| '''<span style="color:#FF0000">PH7</span>'''| '''<span style="color:#FF0000">SPI1_MOSI</span>'''| '''<span style="color:#FF0000">19</span>'''|-| '''<span style="color:#FF0000">232</span>'''| '''<span style="color:#FF0000">PH8</span>'''| '''<span style="color:#FF0000">SPI1_MISO</span>'''| '''<span style="color:#FF0000">21</span>'''|-| '''<span style="color:#FF0000">230</span>'''| '''<span style="color:#FF0000">PH6</span>'''| '''<span style="color:#FF0000">SPI1_CLK</span>'''| '''<span style="color:#FF0000">23</span>'''|-| style="text-align: left;"|| style="text-align: left;"|| '''GND'''| '''25'''|-| '''266'''| '''PI10'''| '''TWI2-SDA/UART3_RX'''| '''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 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/UART4_RX'''
| '''270'''
|-
| '''18'''
| style="text-align: left;"|
| '''228'''
|-
| '''20'''
| '''GND'''
| style="text-align: left;"|
|-
| '''22'''
| '''TWI0_SDA/UART2_RX'''
| '''262'''
|-
| '''230'''| '''PH6'''| '''SPI1_CLK'''| '''23'''|| '''<span style="color:#FF0000">24</span>'''| '''<span style="color:#FF0000">SPI1_CS0</span>'''| '''<span style="color:#FF0000">PH5</span>'''| '''<span style="color:#FF0000">229</span>'''
|-
| '''<span style="text-aligncolor: left;#FF0000"|| style="text-align: left;"|| '''GND'''| '''25'''|| '''>26</span>'''| '''<span style="color:#FF0000">SPI1_CS1</span>'''| '''<span style="color:#FF0000">PH9</span>'''| '''<span style="color:#FF0000">233</span>'''
|-
| '''28'''
| '''TWI2-SCL/UART3_TX'''
| '''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;">
<ol style="list-style-type: lower-alpha;">
<li><p>First run '''orangepi-config'''. Ordinary users remember to add > '''sudo''' permissions.</p>
{| class="wikitable" style="width:800px;" |-| <p>orangepi@orangepi:~$ '''sudo orangepi-config'''</p>|}</li>
<li><p>Then select '''System'''</p>
<p>[[File:zero2w-img80.png]]</p></li>
<li><p>Then select '''Hardware'''</p>
<p>[[File:zero2w-img81.png]]</p></li>
<li><p>Then use the keyboard's arrow keys to locate the position shown > in the figure below, and then use the '''space''' to select the > dtbo configuration of the SPI you want to open.</p></li></ol></li></ol>
{| class="wikitable" style="width:800px;text-align: center;"
|-
| '''dtbo configuration'''
| '''Only open cs1 of spi1'''
|}
</ol>
<ol start="5" style="list-style-type: lower-alpha;">
<li><p>Then select '''<Save>''' to save</p>
<li><p>Then select '''<Reboot>''' to restart the system to make the > configuration take effect.</p>
<p>[[File:zero2w-img85.png]]</p></li></ol>
</li></ol>
<!-- -->
<ol start="3" style="list-style-type: decimal;">
<li><p>Then check whether there is a '''spidev1.x''' device node in the Linux system. If it exists, it means that the SPI1 configuration has taken effect.</p>
{| class="wikitable" style="width:800px;"
|-
|
<p>orangepi@orangepi:~$ '''ls /dev/spidev1*'''</p>
<p>/dev/spidev1.0 /dev/spidev1.1</p>
|}{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big><p>'''Note that only when you open spi1-cs0-cs1-spidev, you will see the device nodes of the two spi.'''</p></big>|}</li>
<li><p>Then you can use the '''spidev_test.py''' program in examples to test the SPI loopback function. The '''spidev_test.py''' program needs to specify the following two parameters:</p>
<ol style="list-style-type: lower-alpha;">
</li>
<li><p>Without shorting the mosi and miso pins of SPI1, the output result of running spidev_test.py is as follows. You can see that the data of TX and RX are inconsistent.</p>
{| class="wikitable" style="width:800px;" |-| <p>root@orangepi:~/wiringOP-Python# '''cd examples'''</p></li></ol>
root@orangepi:~/wiringOP-Python/examples# '''python3 spidev_test.py \'''
Opening device /dev/spidev1.1
TX | FF FF FF FF FF FF '''<span style="color:#FF0000">40 00 00 00 00 95</span>''' FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D |......@.......…| RX | FF FF FF FF FF FF '''FF FF FF FF FF FF''' FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF |.............….|
RX | FF FF FF FF FF FF '''<span style="color:#FF0000">FF FF FF FF FF FF</span>''' FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF |.............….|
|}
</li></ol>
<ol start="6" style="list-style-type: decimal;">
<li><p>Then use Dupont wire to short-circuit the txd (pin 19 in the 40pin interface) and rxd (pin 21 in the 40pin interface) of SPI1 and then run spidev_test.py. The output is as follows, you can see If the data sent and received are the same, it means that the SPI1 loopback test is normal.</p>
{| class="wikitable" style="width:800px;" |-| <p>root@orangepi:~/wiringOP-Python# '''cd examples'''</p></li></ol>
root@orangepi:~/wiringOP-Python/examples# '''python3 spidev_test.py \'''
Opening device /dev/spidev1.1
TX | FF FF FF FF FF FF '''<span style="color:#FF0000">40 00 00 00 00 95</span>''' FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D |......@.......…|
RX | FF FF FF FF FF FF '''<span style="color:#FF0000">40 00 00 00 00 95</span>''' FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D |......@.......…||}</li></ol><span id="pin-i2c-test-1"></span>
=== 40pin I2C test ===
