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    [[rockpi4 | ROCK Pi 4]] > [[rockpi4/dev | Development]] > [[rockpi4/dev/usb-host-and-otg-switch-on-rock-pi-4 | USB host and otg switch on ROCK Pi 4]]

===Description===

This guide describes about usb host and otg switch for the upper USB3.0 port on ROCK Pi 4.

==== Part one: For ROCK Pi 4A / 4A+ / 4B / 4B+ / 4C ====

===== Switch to host mode =====

In hardware, turn the OTG SWITCH to the <code>L</code> side.

===== Switch to otg mode =====

In hardware, turn the OTG SWITCH to the <code>H</code> side.

To use adb, please install package rockchip-adbd. See [[Rockpi4/dev/adb | Using adb ]].

==== Part two: For ROCK Pi 4C+ ====

On ROCK 4C+, we change mode via configuration file /boot/hw_intfc.conf.

===== Switch to host mode =====

Be default OTG port is set in host mode.

Please make sure that line "intfc:dtoverlay=rk3399-usb-otg" is commented with "#".

 # Change USB3_0 node mode to otg
 #intfc:dtoverlay=rk3399-usb-otg

===== Switch to otg mode =====

Uncomment line "intfc:dtoverlay=rk3399-usb-otg"

 # Change USB3_0 node mode to otg
 intfc:dtoverlay=rk3399-usb-otg

To use adb, please install package rockchip-adbd. See [[Rockpi4/dev/adb | Using adb ]].