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How to rotate the WaveShare WS170120 HDMI/USB touchscreen on a Raspberry Pi 4

We’re developing a new product at work, and used a WaveShare WS170120 7″ HDMI/USB touchscreen and a Raspberry Pi 4 during the control prototyping.

The 7″ touchscreen had to be rotated by 90 degrees, and working out how to do this wasn’t that straightforward, so I thought I’d publish it just in case it helps anyone out.

Rotating the display output

To rotate the display, this command should be run at boot:

xrandr --output HDMI-1 --rotate right

More information on the xrandr command can be found at https://xorg-team.pages.debian.net/xorg/howto/use-xrandr.html

Rotating the touchscreen overlay

This was a bit more difficult – several forum posts were either out of date or only gave part of the required information.

This command should also be run at boot:

xinput set-prop 'WaveShare WS170120' 'Coordinate Transformation Matrix' 0 1 0 -1 0 1 0 0 1

A good resource for the xinput command can be found at https://linuxhint.com/change_mouse_touchpad_settings_xinput_linux/

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