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→40pin I2C Test
<big>'''It can be seen from the above table that i2c4_m0 and spi3_m0 are pins. The two cannot be opened at the same time. i2c3_m0 and uart3_m0 are also reused. The two cannot be opened at the same time'''</big>
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<ol start="2" style="list-style-type:decimal;"><li><p>In the linux system, the I2C bus 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="background-color:#ffffdc;width:800px;"
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<bigp>'''In the Linux system, the i2c in 40Pin is closed by default, and it needs to be opened manually to use.''' '''Add the configuration of the red font part below to the /boot/orangepiEnv.txt, and then restart the Linux system to open the i2c2, i2c3, and i2c4 at the same time. If you only need to open one, then fill in one.'''</big> orangepi@orangepi:~$ '''sudo vim /boot/orangepiEnv.txt''' orangepi-config'''<span style="color:#FF0000">overlays=i2c2-m1 i2c3-m0 i2c4-m0</spanp>'''
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</li>
<li><p>Then select '''System'''</p>
<p>[[File:pi3b-1.png]]</p>
</li>
<li><p>Then select '''Hardware'''</p>
<p>[[File:pi3b-2.png]]</p>
</li>
<li><p>Then use the arrow keys on the keyboard to navigate to the position shown in the figure below, and then use the '''space''' to select the I2C configuration you want to open</p>
<p>[[File:pi3b-3-2.png]]</p>
</li>
<li><p>Then select '''<Save>''' to save</p>
<p>[[File:pi3b-4.png]]</p>
</li>
<li><p>Then select '''<Back>'''</p>
<p>[[File:pi3b-5.png]]</p>
</li>
<li><p>Then select '''<Reboot>''' to restart the system to make the configuration take effect</p>
<p>[[File:pi3b-6.png]]</p>
</li>
</ol>
</li></ol>
<ol start="23" style="list-style-type: decimal;">
<li>After starting the Linux system, first confirm that the i2c device node exists under/dev</li>
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</ol>
<ol start="34" style="list-style-type: decimal;">
<li>Then connect a i2c device on the i2c pin of the 40Pin connector</li>
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</ol>
<ol start="45" style="list-style-type: decimal;">
<li>Then use the '''i2cdetect -y''' command if the address of the connected I2C device can be detected, it means that the I2C can be used normally</li>
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