| .. _nrf52840_pca10056: |
| |
| nRF52840-PCA10056 |
| ################# |
| |
| Overview |
| ******** |
| |
| The nRF52840 Preview Development Kit (PCA10056) hardware 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:: img/nrf52840_pca10056.jpg |
| :width: 442px |
| :align: center |
| :alt: nRF52840 PCA10056 Preview DK |
| |
| nRF52840 PCA10056 Preview DK (Credit: Nordic Semi) |
| |
| More information about the board can be found at the |
| `nRF52840 PDK website`_. The `Nordic Semiconductor Documentation library`_ |
| contains the processor's information and the datasheet. |
| |
| Hardware |
| ******** |
| |
| nRF52840 PDK has two external oscillators. The frequency of |
| the slow clock is 32.768 kHz. The frequency of the main clock |
| is 32 MHz. |
| |
| Supported Features |
| ================== |
| |
| The nrf52840_pca10056 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(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 | |
| +-----------+------------+----------------------+ |
| | RTT | Segger | console | |
| +-----------+------------+----------------------+ |
| | SPI(M/S) | on-chip | spi | |
| +-----------+------------+----------------------+ |
| | UART | on-chip | serial | |
| +-----------+------------+----------------------+ |
| | USB | on-chip | usb | |
| +-----------+------------+----------------------+ |
| | WDT | on-chip | watchdog | |
| +-----------+------------+----------------------+ |
| |
| Other hardware features are not supported by the Zephyr kernel. |
| See `nRF52840 PDK website`_ and `Nordic Semiconductor Documentation library`_ |
| for a complete list of nRF52840 Development Kit board hardware features. |
| |
| Connections and IOs |
| =================== |
| |
| LED |
| --- |
| |
| * LED1 (green) = P0.13 |
| * LED2 (green) = P0.14 |
| * LED3 (green) = P0.15 |
| * LED4 (green) = P0.16 |
| |
| Push buttons |
| ------------ |
| |
| * BUTTON1 = SW1 = P0.11 |
| * BUTTON2 = SW2 = P0.12 |
| * BUTTON3 = SW3 = P0.24 |
| * BUTTON4 = SW4 = P0.25 |
| * BOOT = SW5 = boot/reset |
| |
| Programming and Debugging |
| ************************* |
| |
| Applications for the ``nrf52840_pca10056`` board configuration can be |
| built and flashed in the usual way (see :ref:`build_an_application` |
| and :ref:`application_run` for more details); however, the standard |
| debugging targets are not currently available. |
| |
| Flashing |
| ======== |
| |
| Follow the instructions in the :ref:`nordic_segger` page to install |
| and configure all the necessary software. Further information can be |
| found in :ref:`nordic_segger_flashing`. 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 :ref:`hello_world` application. |
| |
| First, run your favorite terminal program to listen for output. |
| |
| .. code-block:: console |
| |
| $ minicom -D <tty_device> -b 115200 |
| |
| Replace :code:`<tty_device>` with the port where the board nRF52 DK |
| can be found. For example, under Linux, :code:`/dev/ttyACM0`. |
| |
| Then build and flash the application in the usual way. |
| |
| .. zephyr-app-commands:: |
| :zephyr-app: samples/hello_world |
| :board: nrf52840_pca10056 |
| :goals: build flash |
| |
| Debugging |
| ========= |
| |
| Refer to the :ref:`nordic_segger` page to learn about debugging Nordic boards with a |
| Segger IC. |
| |
| |
| Testing the LEDs and buttons in the nRF52840 PDK |
| ************************************************ |
| |
| There are 2 samples that allow you to test that the buttons (switches) and LEDs on |
| the board are working properly with Zephyr: |
| |
| .. code-block:: console |
| |
| samples/basic/blinky |
| samples/basic/button |
| |
| You can build and flash the examples to make sure Zephyr is running correctly on |
| your board. The button and LED definitions can be found in :file: |
| `boards/arm/nrf52840_pca10056/nrf52840_pca10056.dts`. |
| |
| Using UART1 |
| *********** |
| |
| The following approach can be used when an application needs to use |
| more than one UART for connecting peripheral devices: |
| |
| 1. Add device tree overlay file to the main directory of your application: |
| |
| .. code-block:: console |
| |
| $ cat nrf52840_pca10056.overlay |
| &uart1 { |
| compatible = "nordic,nrf-uarte"; |
| current-speed = <115200>; |
| status = "ok"; |
| tx-pin = <14>; |
| rx-pin = <16>; |
| }; |
| |
| In the overlay file above, pin P0.16 is used for RX and P0.14 is used for TX |
| |
| 2. Go to menuconfig and enable :option:`CONFIG_UART_1_NRF_UARTE`: |
| |
| (top menu) -> Device Drivers -> Serial Drivers -> nRF UART nrfx drivers |
| |
| 3. Use the UART1 as ``device_get_binding("UART_1")`` |
| |
| Overlay file naming |
| =================== |
| The file has to be named ``<board>.overlay`` and placed in the app main directory to be |
| picked up automatically by the device tree compiler. |
| |
| Selecting the pins |
| ================== |
| To select the pin numbers for tx-pin and rx-pin: |
| |
| .. code-block:: console |
| |
| tx-pin = <pin_no> |
| |
| Open the `nRF52840 Product Specification`_, chapter 7 'Hardware and Layout'. |
| In the table 7.1.1 'aQFN73 ball assignments' select the pins marked |
| 'General purpose I/O'. Note that pins marked as 'low frequency I/O only' can only be used |
| in under-10KHz applications. They are not sutiable for 115200 speed of UART. |
| |
| Translate 'Pin' into number for Device tree by using the following formula:: |
| |
| pin_no = b\*32 + a |
| |
| where ``a`` and ``b`` are from the Pin value in the table (Pb.a). |
| For example, for P0.1, ``pin_no = 1`` and for P1.0, ``pin_no = 32``. |
| |
| References |
| ********** |
| |
| .. target-notes:: |
| |
| .. _nRF52840 PDK website: https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK |
| .. _Nordic Semiconductor Documentation library: https://www.nordicsemi.com/DocLib |
| .. _J-Link Software and documentation pack: https://www.segger.com/jlink-software.html |
| .. _nRF52840 Product Specification: http://infocenter.nordicsemi.com/pdf/nRF52840_PS_v1.0.pdf |