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→The method of USB OTG mode switching
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<big>'''The development board has 4 USB interfaces, among which the USB interface marked in red box in the figure below can support both Host mode and Device mode, and the other 3 USB interfaces only support Host mode.'''</big>
[[File:cm4-img473.png|center]]
<big>'''The USB OTG interface defaults to Host mode, which can be used to connect USB devices such as mouse and keyboard. If you want to use ADB, you need to <span style="color:#FF0000">manually </span>switch to Device mode.'''</big>
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