How to rotate (invert) Raspberry Pi 7" Touch LCD screen & input (RasPi 1, 2, 3)

README.md

Rotate Official Raspberry Pi 7" Touch Screen

Shows how to easily rotate (in this case invert to make orientation correct within a case) the Raspberry Pi 7" Touch Screen.

This will also update the calibration for the touch screen so it will work correctly.

References:

• https://www.raspberrypi.com/products/raspberry-pi-touch-display/

Personal notes

To make both touch and backlight controls work:

First enable I2C via raspi-config.

# /boot/config.txt
dtoverlay=rpi-backlight,i2c0,i2c1

And to control backlight via xscreensaver:

#!/bin/sh
#
# /usr/local/bin/xscreensaver-backlight
#
# Add this to the session autostart after launching xscreensaver
#

process() {
   while read line; do
       case "$line" in
           UNBLANK*)
               sh -c 'echo "0" > /sys/class/backlight/rpi_backlight/bl_power'
           ;;
           BLANK*)
               sh -c 'echo "1" > /sys/class/backlight/rpi_backlight/bl_power'
           ;;
       esac
   done
}

xscreensaver-command -watch | process

Which needs a udev rule to allow access to the system backlight:

# /etc/udev/rules.d/99-backlight.rules
SUBSYSTEM=="backlight",RUN+="/bin/chmod 666 /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power"

boot.txt

# /boot/config.txt
#
# Add the following contents to the bottom of the file:
# This will update rotation in kernel mode.
#


# 1 for 90deg left
# 2 for 180deg (inverted)
# 3 for 90deg right

lcd_rotate=2

cmdline.txt

# /boot/cmdline.txt
#
# Add the following to the end of the line of this file:
#   fbcon=rotate:2
#
# This will rotate the console. Same value as in boot.txt
# You should end up with something looking like this:
#

console=serial0,115200 console=tty1 root=PARTUUID=556e127a-02 rootfstype=ext4 fsck.repair=yes rootwait cfg80211.ieee80211_regdom=GB fbcon=rotate:2

xorg.conf

# /usr/share/X11/xorg.conf.d/99-custom.conf
#
# Create this file and insert content below.
# This will update rotation in Xorg.
#

Section "Monitor"
        # This is the standard value for LCD display
        Identifier "DSI-1"
        
        # Inverts the screen (alternatively set to "left" or "right")
        Option "Rotate" "inverted"
EndSection

Section "InputClass"
        Identifier "libinput touchscreen catchall"
        MatchIsTouchscreen "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
        
        # 180deg inversion calibration of touch input
        Option "CalibrationMatrix" "-1 0 1 0 -1 1 0 0 1"
        
        # 90deg left rotation of touch input
        #Option "CalibrationMatrix" "0 -1 1 1 0 0 0 0 1"
        
        # 90deg right rotation of touch input
        #Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"
        
        # This should be the default for this module
        #Option "CalibrationMatrix" "1 0 0 0 1 0 0 0 1"
EndSection