.. _seeed_xiao_expansion_board:

Seeed Studio XIAO Expansion Board
#################################

Overview
********

Seeed Studio XIAO Expansion Board is a powerful functional expansion board
for `Seeed Studio XIAO series`_ of only half Raspberry Pi 4 size. It enables
building prototypes and projects in an easy and quick way. With its rich
peripherals, you could explore the infinite possibilities of Seeed Studio
XIAO series.

.. figure:: img/seeed_xiao_expansion_board.webp
     :align: center
     :alt: Seeed Studio XIAO Expansion Board

     Seeed Studio XIAO Expansion Board (Credit: Seeed Studio)

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

+-----------------------+---------------------------------------------+
| Shield Connector Pin  | Function                                    |
+=======================+=============================================+
| 0                     | Grove*1 (A0, D0)                            |
+-----------------------+---------------------------------------------+
| 1                     | User button                                 |
+-----------------------+---------------------------------------------+
| 2                     | MicroSD SPI CSn                             |
+-----------------------+---------------------------------------------+
| 3                     | Buzzer(A3)                                  |
+-----------------------+---------------------------------------------+
| 4                     | Grove*2 I2C SDA                             |
+-----------------------+---------------------------------------------+
| 5                     | Grove*2 I2C SCL                             |
+-----------------------+---------------------------------------------+
| 6                     | Grove*1 UART TX                             |
+-----------------------+---------------------------------------------+
| 7                     | Grove*1 UART RX                             |
+-----------------------+---------------------------------------------+
| 8                     | MicroSD SPI SCK      (Serial Clock Input)   |
+-----------------------+---------------------------------------------+
| 9                     | MicroSD SPI MISO     (Serial Data Input)    |
+-----------------------+---------------------------------------------+
| 10                    | MicroSD SPI MOSI     (Serial Data Output)   |
+-----------------------+---------------------------------------------+

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

LED Button Sample
=================

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

.. zephyr-app-commands::
   :zephyr-app: samples/basic/button
   :board: xiao_ble/nrf52840
   :shield: seeed_xiao_expansion_board
   :goals: build

LVGL Basic Sample
==========================

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

.. zephyr-app-commands::
   :zephyr-app: samples/subsys/display/lvgl
   :board: xiao_ble/nrf52840
   :shield: seeed_xiao_expansion_board
   :goals: build

.. _Seeed Studio XIAO series:
   https://www.seeedstudio.com/XIAO-c-1964.html