196 lines
6.3 KiB
ReStructuredText
196 lines
6.3 KiB
ReStructuredText
.. _nrf52_adafruit_feather:
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nRF52 Adafruit Feather
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######################
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Overview
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********
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Zephyr applications use the nrf52_adafruit_feather board configuration
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to run on the nRF52 Adafruit Bluefruit Feather hardware. It provides
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support for the Nordic Semiconductor nRF52832 ARM Cortex-M4F CPU and
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the following devices:
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* :abbr:`NVIC (Nested Vectored Interrupt Controller)`
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* :abbr:`RTC (nRF RTC System Clock)`
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* UART
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* GPIO
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* FLASH
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* RADIO (Bluetooth Low Energy)
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* Segger RTT (RTT Console)
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.. figure:: img/nRF52Feather.png
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:width: 442px
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:align: center
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:alt: nRF52 Adafruit Feather Board
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nRF52 Adafruit Feather Board (Credit: Adafruit)
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More information about the board and its features can be found at the
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`Adafruit Feather nRF52 Bluefruit Learning Guide`_. The `Nordic Semiconductor Infocenter`_
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contains the processor's information and the datasheet.
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Hardware
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********
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- nRF52832 ARM Cortex-M4F processor at 64 MHz
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- 32.768 kHz crystal oscillator
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- 512 KiB flash memory and 64 KiB of SRAM
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- Battery connector and charger for 3.7 V lithium polymer batteries
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- Charging indicator LED
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- 2 User LEDs
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- Reset button
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- SWD connector
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- USB serial converter
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Supported Features
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==================
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The nRF52 Adafruit Feather board configuration supports the following
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hardware features:
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+-----------+------------+----------------------+
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| Interface | Controller | Driver/Component |
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+===========+============+======================+
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| NVIC | on-chip | nested vectored |
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| | | interrupt controller |
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+-----------+------------+----------------------+
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| RTC | on-chip | system clock |
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+-----------+------------+----------------------+
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| UART | on-chip | serial port |
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+-----------+------------+----------------------+
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| GPIO | on-chip | gpio |
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+-----------+------------+----------------------+
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| FLASH | on-chip | flash |
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+-----------+------------+----------------------+
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| RADIO | on-chip | Bluetooth |
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+-----------+------------+----------------------+
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| RTT | on-chip | console |
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+-----------+------------+----------------------+
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Other hardware features are not supported by the Zephyr kernel.
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Connections and IOs
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===================
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The `Adafruit Feather nRF52 Bluefruit Learning Guide`_ has detailed
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information about the board including `pinouts`_ and the `schematic`_.
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LED
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---
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* LED0 (red) = P0.17
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* LED1 (blue) = P0.19
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Push buttons
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------------
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* DFU = SW0 = P0.20
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* RESET = SW1 = P0.21/reset
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Programming and Debugging
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*************************
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The ``nrf52_adafruit_feather`` board is available in two different versions:
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- `Adafruit Feather nRF52 Pro with myNewt Bootloader`_
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This board version is the recommended one to use. It has the SWD header
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already populated and comes with the Mynewt serial bootloader installed by
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default.
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- `Adafruit Feather nRF52 Bluefruit LE`_
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This board is identical to the board above, but the SWD header is not
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populated and ships with an Arduino friendly bootloader. To be able to work
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with this version a 2*5pin 0.5" SWD header (e.g. `Adafruit SWD connector`_)
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needs to be soldered.
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Applications for the ``nrf52_adafruit_feather`` board configuration can be
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built and flashed in the usual way (see :ref:`build_an_application`
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and :ref:`application_run` for more details); however, the standard
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debugging targets are not currently available.
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Flashing
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========
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Flashing Zephyr onto the ``nrf52_adafruit_feather`` board requires an external
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J-Link programmer. The programmer is attached to the X1 SWD header.
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Follow the instructions in the :ref:`nordic_segger` page to install
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and configure all the necessary software. Further information can be
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found in :ref:`nordic_segger_flashing`. Then build and flash
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applications as usual (see :ref:`build_an_application` and
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:ref:`application_run` for more details).
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Here is an example for the :ref:`hello_world` application.
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#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: nrf52_adafruit_feather
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:goals: build
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:compact:
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#. Connect the Adafruit nRF52 Feather to your host computer using USB
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#. Run your favorite terminal program to listen for output.
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.. code-block:: console
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$ minicom -D <tty_device> -b 115200
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Replace :code:`<tty_device>` with the port where the nRF52 Adafruit Feather
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board can be found. For example, under Linux, :code:`/dev/ttyUSB0`.
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#. Flash the image:
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: nrf52_adafruit_feather
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:goals: flash
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:compact:
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You should see "Hello World! arm" in your terminal.
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Debugging
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=========
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The ``nrf52_adafruit_feather`` board does not have an on-board J-Link debug IC
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as some nRF5x development boards, however, instructions from the
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:ref:`nordic_segger` page also apply to this board, with the additional step
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of connecting an external debugger.
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Testing the LEDs and buttons on the nRF52 Adafruit Feather
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**********************************************************
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There are several samples that allow you to test that the buttons (switches) and LEDs on
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the board are working properly with Zephyr:
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- :ref:`blinky-sample`
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- :ref:`button-sample`
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- :ref:`fade-led-sample`
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- :ref:`blink-led-sample`
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- :ref:`96b_carbon_multi_thread_blinky`
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You can build and flash the examples to make sure Zephyr is running correctly on
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your board. The button and LED definitions can be found in :file:`boards/arm/nrf52_adafruit_feather/board.h`.
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References
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**********
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.. target-notes::
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.. _Adafruit Feather nRF52 Bluefruit Learning Guide: https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/introduction
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.. _schematic: https://learn.adafruit.com/assets/39913
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.. _pinouts: https://cdn-learn.adafruit.com/assets/assets/000/046/210/original/Feather_NRF52_Pinout_v1.2.pdf?1504807075
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.. _Nordic Semiconductor Infocenter: http://infocenter.nordicsemi.com/
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.. _J-Link Software and documentation pack: https://www.segger.com/jlink-software.html
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.. _Adafruit Feather nRF52 Bluefruit LE: https://www.adafruit.com/product/3406
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.. _Adafruit Feather nRF52 Pro with myNewt Bootloader: https://www.adafruit.com/product/3574
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.. _Adafruit SWD connector: https://www.adafruit.com/product/752
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