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

2026-09-05T22:25:31Z

Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

Neue Seite

__NOINDEX__
'''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 of the Waveshare 1.44-inch LCD HAT: a 128x128-pixel TFT display with an ST7735S controller, wired to a Raspberry Pi over SPI, plus notes on drivers and sample demos.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL13891 WSAL13891 – 128x128, 1.44inch LCD display HAT for Raspberry Pi]

== Technical overview ==
* Overview: 1.44-inch TFT, 128x128 pixels; ST7735S controller; 3.3 V operating voltage; 4-wire SPI connection.
* Pinout (BCM): KEY1 P21, KEY2 P20, KEY3 P16; joystick UP P6, DOWN P19, LEFT P5, RIGHT P26, PRESS P13; SPI SCLK P11, MOSI P10, CS P8/CE0; DC P25, RST P27, BL P24.
* SPI protocol: The ST7735S uses a 4-wire SPI without MISO (write-only). CSX enables the chip when low; D/CX selects command (0) or data (1).
* SPI mode: Typically mode 0 (CPOL=0, CPHA=0); CPOL sets the idle clock level, CPHA sets which clock edge samples data.
* Color format: Demos use RGB565 (16 bits/pixel). The controller also supports parallel interfaces (RGB444/RGB565/RGB666), but the HAT uses SPI only.
* Raspberry Pi setup: Enable SPI via raspi-config and reboot; check /boot/config.txt to ensure SPI is not occupied by another device.
* Sample demos: Download via wget and extract with 7z; run from the c or python folders; keys may require adding gpio=6,19,5,26,13,21,20,16=pu to config.txt.
* FBCP driver: Framebuffer-based, supports partial refresh and DMA up to about 60 fps; requires a 32-bit OS, incompatible with 64-bit or Bookworm.
* Auto-start: Copy fbcp to /usr/local/bin and add it to /etc/rc.local; the mouse demo runs only under a graphical UI, not over SSH.
* Resolution settings: Set hdmi_force_hotplug, hdmi_cvt, hdmi_group, hdmi_mode, and display_rotate in /boot/config.txt, then reboot.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo raspi-config
sudo reboot
sudo wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz
sudo tar zxvf bcm2835-1.71.tar.gz
cd bcm2835-1.71/
sudo ./configure && sudo make && sudo make check && sudo make install
sudo apt-get install wiringpi
wget https://files.waveshare.com/wiki/common/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
sudo git clone https://github.com/WiringPi/WiringPi
cd WiringPi
sudo ./build
sudo su
wget https://github.com/joan2937/lg/archive/master.zip
unzip master.zip
cd lg-master
sudo make install
sudo apt-get update
sudo apt-get install python3-pip
</syntaxhighlight>

== Notes and version constraints ==
* The FBCP driver does not support 64-bit operating systems or Bookworm; a 32-bit environment is recommended.
* The mouse demo must run under a graphical interface; it will fail over SSH.
* Keys only work on certain Raspberry Pi 4B images after adding gpio=6,19,5,26,13,21,20,16=pu to /boot/config.txt.
* When fbtft is enabled, it occupies spidev0.0 after reboot; to run demos, the relevant lines in /etc/modules must be commented out.
* Before installing FBCP, vc4-kms-v3d must be disabled and the system rebooted.
* Links to third-party projects are provided without warranty regarding content or maintenance.

== Source and revision record ==
* [https://www.waveshare.com/wiki/1.44inch_LCD_HAT 1.44inch LCD HAT - Waveshare Wiki]
* Source revision: 111123
* Captured: 2026-08-30T04:01:11+00:00
* SHA-256: <code>7b00645b4378c66e3d9b46cacd36eb4409fc5b353eaeb71f37ef9a6a20621b1f</code>

WSAL13891 – 1.44inch LCD HAT/en - Versionsgeschichte

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