Changes

{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big>'''Note that the 4 GPIO pins below the Orange Pi CM4 have an external 3.3V pull-up, so setting the pull-down is invalid, and the other pins can normally set the pull-up and pull-down resistor function'''</big>

[[File:cm4-img260.png|center]]|}

::[[File:cm4-img261.png]]

<li>First, you need to set the GPIO port to the input mode, and the third parameter needs to be the serial number of the wPi corresponding to the input pin</li></ol>{| class="wikitable" style="width:800px;" |-| root@orangepi:~/wiringOP# '''gpio mode <span style="color:#FF0000">5 </span> in'''|}</ol>

<li>After setting to input mode, execute the following command to set the GPIO port to pull-up mode</li></ol>{| class="wikitable" style="width:800px;" |-| root@orangepi:~/wiringOP# '''gpio mode <span style="color:#FF0000">5 </span> up'''|}</ol>

<li>Then enter the following command to read the level of the GPIO port, if the level is 1, it means that the pull-up mode is set successfully</li></ol>{| class="wikitable" style="width:800px;" |-| root@orangepi:~/wiringOP# '''gpio read <span style="color:#FF0000">5''' '''1</span>'''

<li>Then execute the following command to set the GPIO port to pull-down mode</li></ol>{| class="wikitable" style="width:800px;" |-| root@orangepi:~/wiringOP# '''gpio mode <span style="color:#FF0000">5 </span> down'''|}</ol>

<li>Then enter the following command to read the level of the GPIO port, if the level is 0, the pull-down mode is set successfully</li>{| class="wikitable" style="width:800px;" |-| root@orangepi:~/wiringOP# '''gpio read <span style="color:#FF0000">5</olspan>'''

root@orangepi:~/wiringOP# '''gpio read 5<span style="color:#FF0000">0</span>'''|}</ol><span id="pin-spi-test"></span>