194 lines
5.8 KiB
ReStructuredText
194 lines
5.8 KiB
ReStructuredText
.. _nrf52840_papyr:
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Electronut Labs Papyr
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#####################
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Overview
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********
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Zephyr applications use the nrf52840_papyr board configuration
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to run on Electronut Labs Papyr hardware. It provides
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support for the Nordic Semiconductor nRF52840 ARM Cortex-M4F CPU and
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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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* :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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* COUNTER
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.. figure:: img/nrf52840_papyr.jpg
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:align: center
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:alt: Electronut Labs Papyr
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Electronut Labs Papyr (Credit: Electronut Labs)
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More information about the board is available at https://gitlab.com/electronutlabs-public/papyr.
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Hardware
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********
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Papyr has two external oscillators. The frequency of
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the slow clock is 32.768 kHz. The frequency of the main clock
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is 32 MHz.
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Supported Features
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==================
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The nrf52840_papyr board configuration supports the following
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hardware features currently:
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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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| 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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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 (blue) = P0.15
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* LED3 (red) = P0.14
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Push buttons
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------------
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* Reset = SW0 = P0.18 (can be used as GPIO also)
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UART
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----
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* TX = P0.8
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* RX = P0.7
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I2C
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---
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I2C pins connected to onboard sensors (I2C_0):
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* SDA = P0.5
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* SCL = P0.6
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SPI
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---
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The e-paper display is connected to the chip via SPI on the following pins (SPI_1):
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* SCK = P0.31
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* MOSI = P0.29
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* MISO = P1.1 (not used by the display)
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NOTE: P1.1 is pin 33 in absolute enumeration.
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Other pins used by the e-paper display are:
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* E-ink enable = P0.11 (cuts off power to the display with MOSFET)
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* CS = P0.30
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* BUSY = P0.3
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* D/C = P0.28
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* RES = P0.2
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Programming and Debugging
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*************************
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Applications for the ``nrf52840_papyr`` 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); Black Magic
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Probe debugger presents itself as two USB-serial ports. On Linux,
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they may come up as ``/dev/ttyACM0`` and ``/dev/ttyACM1``. The first
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one of these (``/dev/ttyACM0`` here) is the debugger port.
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GDB can directly connect to this port without requiring a GDB server by specifying
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``target external /dev/ttyACM0``. The second port acts as a
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serial port, connected to the SoC.
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Flashing
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========
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By default, papyr is configured to be used with a blackmagicprobe compatible
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debugger (see _Bumpy).
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Applications are flashed and run 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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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 serial port of Black Magic Probe.
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For example, under Linux, :code:`/dev/ttyACM1`.
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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: nrf52840_papyr
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:goals: build flash
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Debugging
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=========
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Debug and attach configurations are available using Black Magic Probe, and
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``ninja debug``, or ``ninja attach`` (or with ``make``) are available.
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NOTE: You may need to press the reset button once after using ``ninja flash``
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to start executing the code. (not required with ``debug`` or ``attach``)
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References
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**********
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.. target-notes::
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.. _Electronut Labs website: https://electronut.in
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.. _Store link: https://www.tindie.com/stores/ElectronutLabs/
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.. _Papyr website: https://docs.electronut.in/papyr/
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.. _Schematic: https://gitlab.com/electronutlabs-public/papyr/raw/master/hardware/papyr_schematic_v_0_3.pdf?inline=false
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.. _Datasheet: https://gitlab.com/electronutlabs-public/papyr/raw/master/papyr_v0.3_datasheet.pdf?inline=false
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.. _Nordic Semiconductor Infocenter: http://infocenter.nordicsemi.com/
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.. _Black Magic Probe website: https://github.com/blacksphere/blackmagic
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.. _Bumpy website: https://docs.electronut.in/bumpy/
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