.. _adafruit_feather_nrf52840: Adafruit Feather nRF52840 Express ################################# Overview ******** The Adafruit Feather nRF52840 provides support for the Nordic Semiconductor nRF52840 ARM Cortex-M4F CPU and the following devices: * :abbr:`ADC (Analog to Digital Converter)` * CLOCK * FLASH * :abbr:`GPIO (General Purpose Input Output)` * :abbr:`I2C (Inter-Integrated Circuit)` * :abbr:`MPU (Memory Protection Unit)` * :abbr:`NVIC (Nested Vectored Interrupt Controller)` * :abbr:`PWM (Pulse Width Modulation)` * RADIO (Bluetooth Low Energy and 802.15.4) * :abbr:`RTC (nRF RTC System Clock)` * Segger RTT (RTT Console) * :abbr:`SPI (Serial Peripheral Interface)` * :abbr:`UART (Universal asynchronous receiver-transmitter)` * :abbr:`USB (Universal Serial Bus)` * :abbr:`WDT (Watchdog Timer)` .. figure:: ../../../../../../../../../zephyr/boards/arm/adafruit_feather_nrf52840/doc/img/adafruit_feather_nrf52840.jpg :align: center :alt: Adafruit Feather nRF52840 Express Hardware ******** - nRF52840 ARM Cortex-M4F processor at 64 MHz - 1 MB flash memory and 256 KB of SRAM - Battery connector and charger for 3.7 V lithium polymer batteries - Charging indicator LED - 2 User LEDs - 1 NeoPixel LED - Reset button - SWD connector Supported Features ================== The Adafruit Feather nRF52840 board configuration supports the following hardware features: +-----------+------------+----------------------+ | Interface | Controller | Driver/Component | +===========+============+======================+ | ADC | on-chip | adc | +-----------+------------+----------------------+ | CLOCK | on-chip | clock_control | +-----------+------------+----------------------+ | FLASH | on-chip | flash | +-----------+------------+----------------------+ | GPIO | on-chip | gpio | +-----------+------------+----------------------+ | I2C | 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 | 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 `Adafruit Feather nRF52840 Express Learn site`_ has detailed information about the board including `pinouts`_ and the `schematic`_. LED --- * LED0 (red) = P1.15 * LED1 (blue) = P1.10 Push buttons ------------ * SWITCH = P1.02 * RESET = P0.18 Programming and Debugging ************************* Applications for the ``adafruit_feather_nrf52840`` board configuration can be built and flashed in the usual way (see :ref:`build_an_application` and :ref:`application_run` for more details). Flashing ======== Flashing Zephyr onto the ``adafruit_feather_nrf52480`` board requires an external programmer. The programmer is attached to the SWD header. Build the Zephyr kernel and the :zephyr:code-sample:`blinky` sample application. .. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: adafruit_feather_nrf52840 :goals: build :compact: Flash the image. .. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: adafruit_feather_nrf52840 :goals: flash :compact: You should see the red LED blink. References ********** .. target-notes:: .. _Adafruit Feather nRF52840 Express Learn site: https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather/ .. _pinouts: https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather/pinouts .. _schematic: https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather/downloads