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WSAL24155 – 1.28inch Touch LCD/en - Versionsgeschichte
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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.<br />
<br />
== Summary ==<br />
This module combines a 240×240 IPS display with a capacitive touch panel and communicates via 4-wire SPI and I2C.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL24155 WSAL24155 – 1.28inch Round LCD Display Module with Touch panel, 240×240 Resolution, IPS, SPI And I2C Communication]<br />
<br />
== Technical overview ==<br />
* Resolution 240 × 240 pixels on a round IPS panel<br />
* LCD driver IC: GC9A01 with 129,600 bytes of internal GRAM<br />
* Touch driver IC: CST816S/T, capacitive touch, I2C communication<br />
* Operating voltage: 3.3 V or 5 V – supply and logic voltages must match<br />
* Pins: VCC, GND, MISO, MOSI, SCLK, LCD_CS, LCD_DC, LCD_RST, LCD_BL, TP_SDA, TP_SCL, TP_INT, TP_RST<br />
* SPI protocol: 4-wire SPI, CPOL=0, CPHA=0, MSB first<br />
* I2C device address: 7-bit address 0x15 (write 0x2A, read 0x2B)<br />
* Dimensions: display Φ32.4 mm; module 39.15 × 37 mm, cutout Φ38.5 mm<br />
* Pixel size: 0.135 × 0.135 mm<br />
* Available for Raspberry Pi, Pico, STM32 and Arduino – demos provided<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
sudo raspi-config → Interfacing Options → SPI → Yes<br />
sudo raspi-config → Interfacing Options → I2C → Yes<br />
sudo reboot<br />
git clone https://github.com/WiringPi/WiringPi && cd WiringPi && ./build<br />
sudo apt-get install python-pip python-pil python-numpy<br />
sudo pip install RPi.GPIO smbus spidev<br />
sudo wget https://files.waveshare.com/upload/f/fb/1.28inch_Touch_LCD_RPI.zip<br />
cd ~ && sudo unzip ./1.28inch_Touch_LCD_RPI.zip && cd 1.28inch_Touch_LCD_RPI/c<br />
sudo make clean && sudo make -j && sudo ./main<br />
cd ~/1.28inch_Touch_LCD_RPI/python/examples && sudo python 1inch28_LCD_test.py<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* Supply and logic voltages must be identical, otherwise malfunction may occur<br />
* The SPI interface must not be occupied by other devices – check /boot/config.txt<br />
* Raspberry Pi versions may differ; commands apply to current Pi models<br />
* Demo files are downloaded from an external URL – availability not guaranteed<br />
* For precise register values and timing details, refer to the GC9A01 datasheet<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/1.28inch_Touch_LCD 1.28inch Touch LCD - Waveshare Wiki]<br />
* Source revision: 105669<br />
* Captured: 2026-09-04T03:55:49+00:00<br />
* SHA-256: <code>9a762af82d813c51c5dd811599c061020ce16fd5ed90e5a3adb12153c9d79332</code></div>
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