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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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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 ==
The 1.9inch LCD Module from Waveshare (part number WSAL23822) is an IPS display with a 170x320 pixel resolution and an SPI interface. It is driven by the ST7789V2 controller and supports RGB565 as the standard color format.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL23822 WSAL23822 – 1.9inch LCD Display Module, 170×320 Resolution, SPI Interface, IPS, 262K Colors]

== Technical overview ==
* Resolution: 170 (H) x 320 (V) pixels; the ST7789V2 controller internally supports 240x320, but the display only uses part of the internal RAM.
* Interface: 4-wire SPI; signals are RESX (reset), CSX (chip select, active-low), D/CX (data/command select: DC=0 command, DC=1 data), SDA (RGB data), SCL (SPI clock).
* Voltage: operates at 3.3 V or 5 V; the supply voltage must match the logic voltage, otherwise the module will not work correctly.
* Display dimensions: 22.70 x 42.72 mm; module dimensions: 27.3 x 51.2 mm; pixel pitch: 0.1335 x 0.1335 mm.
* Color format: The LCD accepts 12-bit (RGB444), 16-bit (RGB565), and 18-bit (RGB666); demos use RGB565.
* Raspberry Pi connection: VCC to 3.3 V, GND to GND, DIN to MOSI (BCM 19), CLK to SCLK (BCM 23), CS to CE0 (BCM 24), DS to GPIO 22, RST to GPIO 13, BL to GPIO 12.
* Enabling SPI on the Raspberry Pi is done via "sudo raspi-config", then Interfacing Options -> SPI -> Yes, followed by a reboot; "/boot/config.txt" will show "dtparam=spi=on".
* Maximum power consumption per FAQ: 3.3 V / 40 mA; maximum brightness: 3.3 V / 380 cd/m².
* FBCP integration: The open-source project fbcp-ili9341 uses partial refresh and DMA for up to 60 fps; scripts such as "sudo ./shell/waveshare-1inch9" automatically configure /boot/config.txt and /etc/rc.local.
* STM32 and Arduino examples are included in the source material; the demo file is named 1inch9_LCD_test.py for Python and "sudo ./main 1.9" for C.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo raspi-config
sudo reboot
ls /dev/spi*
sudo ./shell/waveshare-1inch9
sudo cmake -DSPI_BUS_CLOCK_DIVISOR=20 -DWAVESHARE_1INCH9_LCD=ON -DBACKLIGHT_CONTROL=ON -DSTATISTICS=0 ..
sudo make -j
sudo ./fbcp
sudo python3 1inch9_LCD_test.py
</syntaxhighlight>

== Notes and version constraints ==
* The scripts replace /boot/config.txt and /etc/rc.local; back up these files before running them.
* vc4-kms-v3d can interfere with FBCP; it must be disabled in /boot/config.txt and the system rebooted afterwards.
* Exact pin mapping may vary depending on the Raspberry Pi model; the table refers to BCM numbering.
* Compatibility with other microcontrollers (e.g., STM32, Arduino) depends on the specific platform and may require adapted drivers.
* Version-sensitive steps: WiringPi versions differ depending on OS release (pre/post May 2019, Bullseye).
* The stated current and brightness values come from the FAQ and should be verified before product integration.

== Source and revision record ==
* [https://www.waveshare.com/wiki/1.9inch_LCD_Module 1.9inch LCD Module - Waveshare Wiki]
* Source revision: 75071
* Captured: 2026-09-04T03:30:43+00:00
* SHA-256: <code>b5ea5e6fbdf6eda046663618ed354cd0e2ecc505227761e4bd11dcc38f0a8371</code>

WSAL23822 – 1.9inch LCD Module/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex