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boards/seeedstudio-xiao-nrf52840-sense: add initial support
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‎boards/common/seeedstudio-xiao-nrf52840/include/board.h‎

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/** Default MTD device */
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#define MTD_0 mtd_dev_get(0)
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#ifdef BOARD_SEEEDSTUDIO_XIAO_NRF52840_SENSE
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/**
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* @name LSM6DS3TR-C IMU sensor configuration
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* @{
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*/
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#define LSM6DSXX_PARAM_I2C I2C_DEV(1) /**< I2C device of the IMU */
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#define LSM6DSXX_PARAM_ADDR (0x6A) /**< I2C address of the IMU */
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#define LSM6DS3_PWR_PIN GPIO_PIN(1, 8) /**< The IMU is directly supplied by P1.08 */
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/** @} */
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#endif
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/**
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* @name ztimer configuration values
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* @{

‎boards/seeedstudio-xiao-nrf52840-sense/Kconfig‎

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# Copyright (c) 2024 TU Dresden
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#
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# This file is subject to the terms and conditions of the GNU Lesser
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# General Public License v2.1. See the file LICENSE in the top level
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# directory for more details.
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config BOARD
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default "seeedstudio-xiao-nrf52840-sense" if BOARD_XIAO_NRF52840_SENSE
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config BOARD_XIAO_NRF52840_SENSE
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bool
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default y
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select BOARD_COMMON_NRF52
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select CPU_MODEL_NRF52840XXAA
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source "$(RIOTBOARD)/common/nrf52/Kconfig"

‎boards/seeedstudio-xiao-nrf52840-sense/Makefile‎

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MODULE = board
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include $(RIOTBASE)/Makefile.base

‎boards/seeedstudio-xiao-nrf52840-sense/Makefile.dep‎

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ifneq (,$(filter saul_default,$(USEMODULE)))
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USEMODULE += lsm6dsxx
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endif
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# Use the NRFX package for the board initialization
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USEPKG += nrfx
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USEMODULE += boards_common_seeedstudio-xiao-nrf52840
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# include common nrf52 dependencies
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include $(RIOTBOARD)/common/nrf52/Makefile.dep

‎boards/seeedstudio-xiao-nrf52840-sense/Makefile.features‎

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CPU_MODEL = nrf52840xxaa
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include $(RIOTBOARD)/common/nrf52/Makefile.features

‎boards/seeedstudio-xiao-nrf52840-sense/Makefile.include‎

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UF2_SOFTDEV ?= SD730

‎boards/seeedstudio-xiao-nrf52840-sense/board.c‎

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/*
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* Copyright (C) 2025 Technische Universität Hamburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup boards_seeedstudio-xiao-nrf52840-sense
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* @{
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*
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* @file board.c
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* @brief Board specific implementations for the Seeedstudio Xiao
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* nRF52840 Sense board
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*
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*
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* @author Christopher Büchse <[email protected]>
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*
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* @}
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*/
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#include <stdio.h>
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#include "board.h"
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#include "periph/gpio.h"
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#include "hal/nrf_gpio.h"
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void board_init(void)
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{
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/* The IMU is supplied through a GPIO Pin (P1.08), so it has to be set
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* to high power mode. */
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NRF_P1->PIN_CNF[8] = ((uint32_t)NRF_GPIO_PIN_DIR_OUTPUT << GPIO_PIN_CNF_DIR_Pos)
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| ((uint32_t)NRF_GPIO_PIN_INPUT_DISCONNECT << GPIO_PIN_CNF_INPUT_Pos)
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| ((uint32_t)NRF_GPIO_PIN_NOPULL << GPIO_PIN_CNF_PULL_Pos)
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| ((uint32_t)NRF_GPIO_PIN_H0H1 << GPIO_PIN_CNF_DRIVE_Pos)
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| ((uint32_t)NRF_GPIO_PIN_NOSENSE << GPIO_PIN_CNF_SENSE_Pos);
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gpio_set(LSM6DS3_PWR_PIN);
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}

‎boards/seeedstudio-xiao-nrf52840-sense/doc.md‎

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@defgroup boards_seeedstudio-xiao-nrf52840-sense Seeed Studio XIAO nRF52840 Sense
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@ingroup boards
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@brief Support for the Seeed Studio XIAO nRF52840 Sense
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### General information
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The [XIAO nRF52840 Sense][seeedstudio-xiao-nrf52840-sense]
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is a development board from Seeed Studio's XIAO board family.
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It provides native USB support, Bluetooth
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Low Energy and IEEE 802.15.4 support via the nRF52840 MCU.
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Compared to the [XIAO nRF52840](@ref boards_seeedstudio-xiao-nrf52840) it
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features an ST LSM6DS3TR-C IMU and a PDM Microphone (not supported yet).
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<img src="https://files.seeedstudio.com/wiki/XIAO-BLE/pinout2.png"
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alt="top-down view on seeedstudio-xiao-nrf52840" width="50%"/>
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[seeedstudio-xiao-nrf52840-sense]: https://wiki.seeedstudio.com/XIAO_BLE/
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### Using the LSM6DS3TR-C IMU
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You can test the built-in IMU with the test provided in `tests/drivers/lsm6dsxx`:
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```shell
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make BOARD=seeedstudio-xiao-nrf52840-sense -C tests/drivers/lsm6dsxx flash term
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```
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### Flashing, Bootloader, and Terminal
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Refer to the [Feather nRF52840 Express
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documentation](https://doc.riot-os.org/group__boards__feather-nrf52840.html) for further details.
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Both use the same flasher, bootloader, and terminal settings.
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Example with `hello-world` application:
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```shell
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make BOARD=seeedstudio-xiao-nrf52840-sense -C examples/basic/hello-world flash term
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```

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