Quelltext der Seite WSAL21230 – 8inch DSI LCD (with cam)/en

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
Technical overview: The 8-inch capacitive touch display (WSAL21230) is driven via the Raspberry Pi DSI signal and includes an integrated OV5647 front camera (5 MP, CSI).

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL21230 WSAL21230 – 8inch Capacitive Touch Display for Raspberry Pi, with 5MP Front Camera, 800×480, DSI]

== Technical overview ==
* Resolution 800 × 480; capacitive 5-point touch with toughened glass (up to 6H hardness)
* Camera: OV5647, 5 MP, 72.9° diagonal field of view, native resolution 2592 × 1944
* DSI connection: Pi 4B/3B+/3A+/3B/2B/B+/A+ use a 15-pin FPC cable; Pi 5/CM4/CM3+/CM3 use a 22-pin DSI-Cable-12cm on DSI1
* CSI camera cable: older models use a 15-pin FFC; Pi 5/CM4/CM3+/CM3 use a 22-pin Pi5-Camera-Cable on CSI0
* Power supplied through pogo pins; two 5 V outputs available for accessories such as cooling fans
* config.txt settings: dtoverlay=vc4-kms-v3d plus dtoverlay=vc4-kms-dsi-7inch (recommended DSI1); DSI0 only as alternative
* Backlight control: demo app (Bookworm/Bullseye only) or terminal command echo X &#124; sudo tee /sys/class/backlight/*/brightness (X = 0–255)
* Display rotation: Bookworm syncs display and touch via “Screen Configuration”; older systems need extra touch rotation via xorg.conf.d
* Camera usage: raspicam/raspivid commands for still/video capture (e.g., raspicam -t 10000, raspivid -t 10000)
* Corner radius 8.88 mm; full-white brightness 300 cd/m²

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
dtoverlay=vc4-kms-v3d
dtoverlay=vc4-kms-dsi-7inch
#dtoverlay=vc4-kms-dsi-7inch,dsi0
echo X | sudo tee /sys/class/backlight/*/brightness
echo 100 | sudo tee /sys/class/backlight/*/brightness
echo 0 | sudo tee /sys/class/backlight/*/brightness
echo 255 | sudo tee /sys/class/backlight/*/brightness
display_rotate=1 #1：90；2: 180； 3: 270
video=DSI-1:800x480M@60,rotate=90
video=DSI-1:800x480M@60,rotate=180
video=DSI-1:800x480M@60,rotate=270
sudo apt-get install xserver-xorg-input-libinput
sudo apt install xserver-xorg-input-synaptics
sudo mkdir /etc/X11/xorg.conf.d
sudo cp /usr/share/X11/xorg.conf.d/40-libinput.conf /etc/X11/xorg.conf.d/
Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1
Option "CalibrationMatrix" "-1 0 1 0 -1 1 0 0 1
Option "CalibrationMatrix" "0 -1 1 1 0 0 0 0 1
xset dpms force off
disable_touchscreen=1
</syntaxhighlight>

== Notes and version constraints ==
* The source contains no information about price, availability, certifications, or warranty; therefore none were included.
* On Pi 5/CM4/CM3+/CM3 there are two MIPI DSI interfaces – the correct one (DSI1 recommended) must be manually verified.
* The update command “sudo rpi-update pulls/6050” is version-sensitive (kernel 6.6.20) and requires a backup before updating.
* The touch rotation matrix depends on the exact OS branch; if uncertain, a human should confirm the correct matrix.
* The camera commands raspicam/raspivid are OS-branch dependent; without knowing the exact system, the correct syntax cannot be stated with certainty.

== Source and revision record ==
* [https://www.waveshare.com/wiki/8inch_DSI_LCD_(with_cam) 8inch DSI LCD (with cam) - Waveshare Wiki]
* Source revision: 100817
* Captured: 2026-09-03T02:39:22+00:00
* SHA-256: <code>aaf787b85bf0a2462b36cf0b3c25f6e78a92e5e40af0425a4aaaf6e52f4dfb8b</code>