237 lines
7.6 KiB
ReStructuredText
237 lines
7.6 KiB
ReStructuredText
.. _nrf21540dk_nrf52840:
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nRF21540 DK
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###########
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Overview
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********
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The nRF21540 DK (PCA10112) shows possibility of the Nordic Semiconductor
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nRF21540 Front End Module connected with nRF52840 ARM Cortex-M4F CPU.
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The CPU provides support for the following devices:
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* :abbr:`ADC (Analog to Digital Converter)`
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* CLOCK
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* FLASH
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* :abbr:`GPIO (General Purpose Input Output)`
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* :abbr:`I2C (Inter-Integrated Circuit)`
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* :abbr:`MPU (Memory Protection Unit)`
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* :abbr:`NVIC (Nested Vectored Interrupt Controller)`
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* :abbr:`PWM (Pulse Width Modulation)`
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* RADIO (Bluetooth Low Energy and 802.15.4)
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* :abbr:`RTC (nRF RTC System Clock)`
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* Segger RTT (RTT Console)
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* :abbr:`SPI (Serial Peripheral Interface)`
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* :abbr:`UART (Universal asynchronous receiver-transmitter)`
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* :abbr:`USB (Universal Serial Bus)`
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* :abbr:`WDT (Watchdog Timer)`
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.. figure:: img/nrf21540dk_nrf52840.jpg
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:align: center
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:alt: nRF21540 DK
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nRF21540 DK (Credit: Nordic Semiconductor)
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More information about the board can be found at the `nRF21540 website`_.
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`nRF21540 Product Specification`_ contains the processor's and front end
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module's information and the datasheet.
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Hardware
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********
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The nRF52840 on the nRF21540 DK has two external oscillators. The frequency
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of the slow clock is 32.768 kHz. The frequency of the main clock is 32 MHz.
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Supported Features
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==================
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The nrf21540dk/nrf52840 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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| ADC | on-chip | adc |
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+-----------+------------+----------------------+
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| CLOCK | on-chip | clock_control |
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+-----------+------------+----------------------+
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| FLASH | on-chip | flash |
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+-----------+------------+----------------------+
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| GPIO | on-chip | gpio |
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+-----------+------------+----------------------+
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| I2C(M) | on-chip | i2c |
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+-----------+------------+----------------------+
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| MPU | on-chip | arch/arm |
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+-----------+------------+----------------------+
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| NVIC | on-chip | arch/arm |
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+-----------+------------+----------------------+
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| PWM | on-chip | pwm |
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+-----------+------------+----------------------+
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| RADIO | on-chip | Bluetooth, |
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| | | ieee802154 |
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+-----------+------------+----------------------+
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| RTC | on-chip | system clock |
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+-----------+------------+----------------------+
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| RTT | Segger | console |
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+-----------+------------+----------------------+
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| SPI(M/S) | on-chip | spi |
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+-----------+------------+----------------------+
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| UART | on-chip | serial |
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+-----------+------------+----------------------+
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| USB | on-chip | usb |
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+-----------+------------+----------------------+
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| WDT | on-chip | watchdog |
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+-----------+------------+----------------------+
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Other hardware features have not been enabled yet for this board.
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See `nRF52840 Product Specification`_ and `nRF21540 DK Hardware guide`_
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for a complete list of nRF21540 Development Kit board hardware features.
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Connections and IOs
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===================
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LED
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---
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* LED1 (green) = P0.13
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* LED2 (green) = P0.14
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* LED3 (green) = P0.15
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* LED4 (green) = P0.16
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Push buttons
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------------
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* BUTTON1 = SW1 = P0.11
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* BUTTON2 = SW2 = P0.12
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* BUTTON3 = SW3 = P0.24
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* BUTTON4 = SW4 = P0.25
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* BOOT = SW5 = boot/reset
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Front End Module
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----------------
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* MOSI = P1.13
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* MISO = P1.14
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* CLOCK = P1.15
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* CHIP SELECT = P0.21
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* PDN = P0.23
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* MODE = P0.17
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* RXEN = P0.19
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* ANTSEL = P0.20
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* TXEN = P0.22
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Programming and Debugging
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*************************
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Applications for the ``nrf21540dk/nrf52840`` board configuration can be built,
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flashed, and debugged in the usual way. See :ref:`build_an_application` and
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:ref:`application_run` for more details on building and running.
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Flashing
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========
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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 :zephyr:code-sample:`hello_world` application.
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First, 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 board nRF21540 DK
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can be found. For example, under Linux, :code:`/dev/ttyACM0`.
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Then build and flash the application in the usual way.
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: nrf21540dk/nrf52840
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:goals: build flash
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Debugging
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=========
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Refer to the :ref:`nordic_segger` page to learn about debugging Nordic boards with a
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Segger IC.
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Testing the LEDs and buttons in the nRF21540 DK
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***********************************************
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There are 2 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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.. code-block:: console
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samples/basic/blinky
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samples/basic/button
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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
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:zephyr_file:`boards/nordic/nrf21540dk/nrf21540dk_nrf52840.dts`.
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Changing UART1 pins
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*******************
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The following approach can be used when an application needs to use another set
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of pins for UART1:
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1. Add devicetree overlay file to the main directory of your application:
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.. code-block:: devicetree
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&pinctrl {
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uart1_default_alt: uart1_default_alt {
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group1 {
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psels = <NRF_PSEL(UART_TX, 0, 14)>,
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<NRF_PSEL(UART_RX, 0, 16)>;
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};
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};
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/* required if CONFIG_PM_DEVICE=y */
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uart1_sleep_alt: uart1_sleep_alt {
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group1 {
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psels = <NRF_PSEL(UART_TX, 0, 14)>,
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<NRF_PSEL(UART_RX, 0, 16)>;
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low-power-enable;
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};
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};
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};
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&uart1 {
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pinctrl-0 = <&uart1_default_alt>;
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/* if sleep state is not used, use /delete-property/ pinctrl-1; and
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* skip the "sleep" entry.
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*/
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pinctrl-1 = <&uart1_sleep_alt>;
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pinctrl-names = "default", "sleep";
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};
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In the overlay file above, pin P0.16 is used for RX and P0.14 is used for TX
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See :ref:`set-devicetree-overlays` for further details.
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Selecting the pins
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==================
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Pins can be configured in the board pinctrl file. To see the available mappings,
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open the `nRF52840 Product Specification`_, chapter 7 'Hardware and Layout'.
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In the table 7.1.1 'aQFN73 ball assignments' select the pins marked
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'General purpose I/O'. Note that pins marked as 'low frequency I/O only' can only be used
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in under-10KHz applications. They are not suitable for 115200 speed of UART.
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References
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**********
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.. target-notes::
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.. _nRF21540 DK Hardware guide: https://docs.nordicsemi.com/bundle/ug_nrf21540_dk/page/UG/nrf21540_DK/intro.html
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.. _J-Link Software and documentation pack: https://www.segger.com/jlink-software.html
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.. _nRF21540 website: https://www.nordicsemi.com/Products/Low-power-short-range-wireless/nRF21540
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.. _nRF52840 Product Specification: https://docs.nordicsemi.com/bundle/ps_nrf52840/page/keyfeatures_html5.html
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.. _nRF21540 Product Specification: https://docs.nordicsemi.com/bundle/ps_nrf21540/page/keyfeatures_html5.html
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