.. _buydisplay_3_5_tft_touch_arduino:

Buydisplay 3.5" TFT Touch Shield with Arduino adapter
#####################################################

Overview
********

The Buydisplay 3.5" TFT Touch Shield has a resolution of 320x480
pixels and is based on the ILI9488 controller. On the capacitive touch
version this shield comes with a FT6236 touch controller. The Arduino
adapter is required to use this shield. Note that both display and
Arduino shields are sold in multiple combinations of interfaces. The
current Zephyr driver only supports the 4-wire SPI interface.

More information about the shield and Arduino adapter can be found at
the `Buydisplay 3.5" TFT Touch Shield website`_ and
`Arduino adapter website`_.

Pin Assignments
===============

+-----------------------+---------------------------------------------+
| Shield Connector Pin  | Function                                    |
+=======================+=============================================+
| D5                    | Touch Controller IRQ (see note below)       |
+-----------------------+---------------------------------------------+
| D7                    | ILI9488 DC       (Data/Command)             |
+-----------------------+---------------------------------------------+
| D10                   | ILI9488 Reset                               |
+-----------------------+---------------------------------------------+
| D9                    | ILI9488 SPI CSn                             |
+-----------------------+---------------------------------------------+
| D11                   | SPI MOSI         (Serial Data Input)        |
+-----------------------+---------------------------------------------+
| D12                   | SPI MISO         (Serial Data Out)          |
+-----------------------+---------------------------------------------+
| D13                   | SPI SCK          (Serial Clock Input)       |
+-----------------------+---------------------------------------------+
| SDA                   | FT6236 SDA                                  |
+-----------------------+---------------------------------------------+
| SCL                   | FT6236 SCL                                  |
+-----------------------+---------------------------------------------+

.. note::
   Touch controller IRQ line is not connected by default. You will need
   to solder the ``5 INT`` jumper to use it. You will also need to
   adjust driver configuration and its Device Tree entry to make use of
   it.

Requirements
************

This shield can only be used with a board which provides a configuration
for Arduino connectors and defines node aliases for SPI and GPIO interfaces
(see :ref:`shields` for more details).

Programming
***********

Set ``-DSHIELD=buydisplay_3_5_tft_touch_arduino`` when you invoke
``west build``. For example:

.. zephyr-app-commands::
   :zephyr-app: samples/subsys/display/lvgl
   :board: nrf52840dk_nrf52840
   :shield: buydisplay_3_5_tft_touch_arduino
   :goals: build

References
**********

.. target-notes::

.. _Buydisplay 3.5" TFT Touch Shield website:
   https://www.buydisplay.com/lcd-3-5-inch-320x480-tft-display-module-optl-touch-screen-w-breakout-board

.. _Arduino adapter website:
   https://www.buydisplay.com/arduino-3-5-tft-lcd-touch-shield-serial-spi-example-for-mega-due