.. _xiao_ble: XIAO BLE (Sense) ################ Overview ******** The Seeed XIAO BLE (Sense) is a tiny (21 mm x 17.5 mm) Nordic Semiconductor nRF52840 ARM Cortex-M4F development board with onboard LEDs, USB port, QSPI flash, battery charger, and range of I/O broken out into 14 pins. .. figure:: img/xiao_ble.jpg :align: center :alt: XIAO BLE Hardware ******** - Nordic nRF52840 Cortex-M4F processor at 64MHz - 2MB QSPI Flash - RGB LED - USB Type-C Connector, nRF52840 acting as USB device - Battery charger BQ25101 - Reset button - Bluetooth antenna - LSM6DS3TR-C 6D IMU (3D accelerometer and 3D gyroscope) (XIAO BLE Sense only) - PDM microphone (XIAO BLE Sense only) Supported Features ================== The xiao_ble board configuration supports the following hardware features: +-----------+------------+----------------------+ | Interface | Controller | Driver/Component | +===========+============+======================+ | ADC | on-chip | adc | +-----------+------------+----------------------+ | CLOCK | on-chip | clock_control | +-----------+------------+----------------------+ | FLASH | on-chip | flash, QSPI flash | +-----------+------------+----------------------+ | GPIO | on-chip | gpio | +-----------+------------+----------------------+ | I2C(M) | on-chip | i2c | +-----------+------------+----------------------+ | MPU | on-chip | arch/arm | +-----------+------------+----------------------+ | NVIC | on-chip | arch/arm | +-----------+------------+----------------------+ | PWM | on-chip | pwm | +-----------+------------+----------------------+ | RADIO | on-chip | Bluetooth, | | | | ieee802154 | +-----------+------------+----------------------+ | RTC | on-chip | system clock | +-----------+------------+----------------------+ | SPI(M/S) | on-chip | spi | +-----------+------------+----------------------+ | UART | on-chip | serial | +-----------+------------+----------------------+ | USB | on-chip | usb | +-----------+------------+----------------------+ | WDT | on-chip | watchdog | +-----------+------------+----------------------+ Other hardware features have not been enabled yet for this board. Connections and IOs =================== The `XIAO BLE wiki`_ has detailed information about the board including `pinouts`_ and the `schematic`_. LED --- * LED1 (red) = P0.26 * LED2 (green) = P0.30 * LED3 (blue) = P0.06 Programming and Debugging ************************* The XIAO BLE ships with the `Adafruit nRF52 Bootloader`_ which supports flashing using `UF2`_. Doing so allows easy flashing of new images, but does not support debugging the device. For debugging please use `External Debugger`_. UF2 Flashing ============ To enter the bootloader, connect the USB port of the XIAO BLE to your host, and double tap the reset botton to the left of the USB connector. A mass storage device named ``XIAO BLE`` should appear on the host. Using the command line, or your file manager copy the :file:`zephyr/zephyr.uf2` file from your build to the base of the ``XIAO BLE`` mass storage device. The XIAO BLE will automatically reset and launch the newly flashed application. External Debugger ================= In order to support debugging the device, instead of using the bootloader, you can use an :ref:`External Debug Probe `. To flash and debug Zephyr applications you need to use `Seeeduino XIAO Expansion Board`_ or solder an SWD header onto the back side of the board. For Segger J-Link debug probes, follow the instructions in the :ref:`jlink-external-debug-probe` page to install and configure all the necessary software. Flashing -------- Setup and connect a supported debug probe (JLink, instructions at :ref:`jlink-external-debug-probe` or BlackMagic Probe). Then build and flash applications as usual (see :ref:`build_an_application` and :ref:`application_run` for more details). Here is an example for the :zephyr:code-sample:`hello_world` application. First, run your favorite terminal program to listen for output. .. code-block:: console $ minicom -D -b 115200 Replace :code:`` with the port where the board XIAO BLE can be found. For example, under Linux, :code:`/dev/ttyACM0`. Then build and flash the application in the usual way. Just add ``CONFIG_BOOT_DELAY=5000`` to the configuration, so that USB CDC ACM is initialized before any text is printed, as below: .. tabs:: .. group-tab:: XIAO BLE .. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: xiao_ble :goals: build flash :gen-args: -DCONFIG_BOOT_DELAY=5000 .. group-tab:: XIAO BLE Sense .. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: xiao_ble/nrf52840/sense :goals: build flash :gen-args: -DCONFIG_BOOT_DELAY=5000 Debugging --------- Refer to the :ref:`jlink-external-debug-probe` page to learn about debugging boards with a Segger IC. Debugging using a BlackMagic Probe is also supported. Testing the LEDs in the XIAO BLE (Sense) **************************************** There is a sample that allows to test that LEDs on the board are working properly with Zephyr: .. tabs:: .. group-tab:: XIAO BLE .. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: xiao_ble :goals: build flash .. group-tab:: XIAO BLE Sense .. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: xiao_ble/nrf52840/sense :goals: build flash You can build and flash the examples to make sure Zephyr is running correctly on your board. The LED definitions can be found in :zephyr_file:`boards/seeed/xiao_ble/xiao_ble_common.dtsi`. Testing shell over USB in the XIAO BLE (Sense) ********************************************** There is a sample that allows to test shell interface over USB CDC ACM interface with Zephyr: .. tabs:: .. group-tab:: XIAO BLE .. zephyr-app-commands:: :zephyr-app: samples/subsys/shell/shell_module :board: xiao_ble :goals: build flash .. group-tab:: XIAO BLE Sense .. zephyr-app-commands:: :zephyr-app: samples/subsys/shell/shell_module :board: xiao_ble/nrf52840/sense :goals: build flash References ********** .. target-notes:: .. _XIAO BLE wiki: https://wiki.seeedstudio.com/XIAO_BLE/ .. _pinouts: https://wiki.seeedstudio.com/XIAO_BLE/#hardware-overview .. _schematic: https://wiki.seeedstudio.com/XIAO_BLE/#resources .. _Seeeduino XIAO Expansion Board: https://wiki.seeedstudio.com/Seeeduino-XIAO-Expansion-Board/ .. _Adafruit nRF52 Bootloader: https://github.com/adafruit/Adafruit_nRF52_Bootloader .. _UF2: https://github.com/microsoft/uf2