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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 guide covers the hardware connection, software demos, and driver functions of the Waveshare 3.5-inch Touch LCD Shield (item WSAL13506) for Arduino and STM32 boards.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL13506 WSAL13506 – 3.5inch Touch LCD Shield for Arduino]<br />
<br />
== Technical overview ==<br />
* The display uses an ILI9486 controller and is initialized via the SPI protocol.<br />
* For Arduinos with an ICSP header, leave the DIP switch on the ICSP side; without ICSP, set it to SCLK/D13, MISO/D12, and MOSI/D11.<br />
* Demo projects include LCD_Show (patterns and clock), LCD_ShowBMP (BMP image display), and LCD_Touch (drawing board).<br />
* BMP images must reside in the root directory of a FAT-formatted SD card and be exactly 480x320 pixels at 24-bit color depth.<br />
* The XPT2046 touch controller is initialized with TP_Init and requires calibration via the AD button in the demo.<br />
* GUI functions are available for drawing points, lines, rectangles, circles, and text.<br />
* The font library provides five sizes (font8 through font24); custom fonts can be generated with the included extraction tool.<br />
* On STM32, the demo was tested on an XNUCLEO-F103RB; wiring follows the schematic and may require the non-ICSP switch setting.<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
System_Init(); // System initialisierung, konfiguriert serielle Baudrate, SPI und Pins<br />
LCD_Init(Lcd_ScanDir, 200); // Initialisiert das Display mit Scanmodus und Helligkeit<br />
SD_Init(); // Initialisiert die SD-Karte<br />
LCD_ShowBMP(); // Zeigt ein BMP-Bild an<br />
TP_Init(Lcd_ScanDir); // Initialisiert das Touchpad<br />
TP_GetAdFac(); // Kalibriert den Bildschirm<br />
TP_Dialog(); // Leert den Bildschirm<br />
TP_DrawBoard(); // Öffnet das Zeichenbrett<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* The maximum power consumption of 5V / 138.6 mA is from the FAQ; actual draw should be measured before integrating into a custom project.<br />
* Pin assignments vary by Arduino or STM32 board; always verify against the specific schematic.<br />
* Touchpad calibration values are factory defaults; recalibration is needed if drift occurs.<br />
* BMP file names and paths are hardcoded in the demo; changes require code modifications.<br />
* HAL library version and exact firmware versions affect compatibility; this must be verified before deployment.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/3.5inch_TFT_Touch_Shield 3.5inch TFT Touch Shield - Waveshare Wiki]<br />
* Source revision: 109836<br />
* Captured: 2026-08-30T03:49:24+00:00<br />
* SHA-256: <code>d10c4ea7f54b25fa09bf325dca5f5995d75f5e0b9b5f019d257971080d4eaabd</code></div>JWTechPublisher