tree: 78455817415944d5f040b23489b5d0c311261e35 [path history] [tgz]
  1. alarm.c
  2. diag.c
  4. fem.c
  5. flash.c
  6. flash_nosd.c
  7. flash_sd.c
  8. logging.c
  11. misc.c
  12. nrf52840.ld
  13. openthread-core-nrf52840-config.h
  14. platform-config.h
  15. platform-fem.h
  16. platform-nrf5.h
  17. platform-softdevice.h
  18. platform.c
  19. radio.c
  20. random.c
  22. softdevice.c
  23. softdevice.h
  24. spi-slave.c
  25. temp.c
  26. uart.c
  27. usb-cdc-uart.c

OpenThread on nRF52840 Example

This directory contains example platform drivers for Nordic Semiconductor nRF52840 SoC.

To facilitate Thread products development with the nRF52840 platform, Nordic Semiconductor provides nRF5 SDK for Thread and Zigbee. See Nordic Semiconductor's nRF5 SDK for Thread and Zigbee section for more details.


Download and install GNU toolchain for ARM Cortex-M.

In a Bash terminal, follow these instructions to install the GNU toolchain and other dependencies.

$ cd <path-to-openthread>
$ ./script/bootstrap

Building the examples

$ cd <path-to-openthread>
$ ./bootstrap
$ make -f examples/Makefile-nrf52840

After a successful build, the elf files can be found in <path-to-openthread>/output/nrf52840/bin. You can convert them to hex files using arm-none-eabi-objcopy:

$ arm-none-eabi-objcopy -O ihex ot-cli-ftd ot-cli-ftd.hex

Native USB support

You can build the libraries with support for native USB CDC ACM as a serial transport. To do so, build the libraries with the following parameter:

$ make -f examples/Makefile-nrf52840 USB=1

Note, that if Windows 7 or earlier is used, an additional USB CDC driver has to be loaded. It can be found in third_party/NordicSemiconductor/libraries/usb/nordic_cdc_acm_example.inf

Native SPI Slave support

You can build the libraries with support for native SPI Slave. To do so, build the libraries with the following parameter:

$ make -f examples/Makefile-nrf52840 NCP_SPI=1

With this option enabled, SPI communication between the NCP example and wpantund is possible (provided that the wpantund host supports SPI Master). To achieve that, an appropriate SPI device should be chosen in wpantund configuration file, /etc/wpantund.conf. You can find an example below.

Config:NCP:SocketPath "system:/usr/bin/spi-hdlc-adapter --gpio-int /sys/class/gpio/gpio25 /dev/spidev0.0"

spi-hdlc-adapter is a tool that can be used to perform communication between NCP and wpantund over SPI. In the above example it is assumed that spi-hdlc-adapter is installed in /usr/bin.

The default SPI Slave pin configuration for nRF52840 is defined in examples/platforms/nrf52840/platform-config.h.

Note that the native SPI Slave support is not intended to be used with Engineering sample A of the nRF52840 chip due to single transfer size limitation.

Flashing the binaries

Flash the compiled binaries onto nRF52840 using nrfjprog which is part of the nRF5x Command Line Tools.

$ nrfjprog -f nrf52 --chiperase --program output/nrf52840/bin/ot-cli-ftd.hex --reset

Running the example

  1. Prepare two boards with the flashed CLI Example (as shown above).

  2. The CLI example uses UART connection. To view raw UART output, start a terminal emulator like PuTTY and connect to the used COM port with the following UART settings:

    • Baud rate: 115200
    • 8 data bits
    • 1 stop bit
    • No parity
    • HW flow control: RTS/CTS

    On Linux system a port name should be called e.g. /dev/ttyACM0 or /dev/ttyACM1.

  3. Open a terminal connection on the first board and start a new Thread network.

> panid 0xabcd
> ifconfig up
> thread start
  1. After a couple of seconds the node will become a Leader of the network.
> state
  1. Open a terminal connection on the second board and attach a node to the network.
> panid 0xabcd
> ifconfig up
> thread start
  1. After a couple of seconds the second node will attach and become a Child.
> state
  1. List all IPv6 addresses of the first board.
> ipaddr
  1. Choose one of them and send an ICMPv6 ping from the second board.
> ping fdde:ad00:beef:0:0:ff:fe00:fc00
16 bytes from fdde:ad00:beef:0:0:ff:fe00:fc00: icmp_seq=1 hlim=64 time=8ms

For a list of all available commands, visit OpenThread CLI Reference

Logging module

By default, the OpenThread‘s logging module provides functions to output logging information over SEGGER’s Real Time Transfer (RTT).

RTT output can be viewed in the J-Link RTT Viewer, which is available from SEGGER. The viewer is also included in the nRF Tools. To read or write messages over RTT, connect an nRF5 development board via USB and run the J-Link RTT Viewer.

Select the correct target device (nRF52) and the target interface “SWD”.

The intended log level can be set using OPENTHREAD_CONFIG_LOG_LEVEL define.

Disabling the Mass Storage Device

Due to a known issue in Segger’s J-Link firmware, depending on your version, you might experience data corruption or drops if you use the serial port. You can avoid this issue by disabling the Mass Storage Device:

  • On Linux or macOS (OS X), open JLinkExe from the terminal.
  • On Microsoft Windows, open the J-Link Commander application.

Run the following command: MSDDisable

Diagnostic module

nRF52840 port extends OpenThread Diagnostics Module.

You can read about all the features here.

Radio driver documentation

The radio driver comes with documentation that describes the operation of state machines in this module. To open the *.uml sequence diagrams, use PlantUML.


The following toolchains have been used for testing and verification:

  • gcc version 4.9.3
  • gcc version 6.2.0

The following OpenThread commits have been verified with nRF52840 examples by Nordic Semiconductor:

  • ec59d7e - 06.04.2018 (the newest checked)
  • a89eb88 - 16.11.2017
  • 6a15261 - 29.06.2017
  • 030efba - 22.04.2017
  • de48acf - 02.03.2017
  • 50db58d - 23.01.2017

Nordic Semiconductor's nRF5 SDK for Thread and Zigbee

The nRF5 Software Development Kit (SDK) for Thread and Zigbee helps you when developing Thread products with Nordic Semiconductor's advanced nRF52840 System on Chip (SoC).

The nRF5 SDK for Thread and Zigbee includes:

  • a pre-built OpenThread stack for the Nordic nRF52840 SoC with ARM® CryptoCell-310 support,
  • unique Thread/Bluetooth Low Energy dynamic multiprotocol solution which allows for concurrent operation of Thread and Bluetooth Low Energy utilizing OpenThread and SoftDevice (Nordic’s Bluetooth Low Energy stack) with accompanying example applications,
  • Thread/Bluetooth Low Energy switched multiprotocol solution with accompanying example applications,
  • unique support for DFU-over-Thread (Device Firmware Upgrade),
  • examples to demonstrate interactions between nodes performing different Thread roles with the use of OpenThread and CoAP or MQTT-SN protocols,
  • support for an OpenThread Network Co-Processor (NCP) using either UART or USB transport protocol,
  • Border Router and cloud connectivity example,
  • Thread native commissioning with NFC example,
  • example applications demonstrating the use of FreeRTOS with OpenThread,
  • support for IAR, Keil MDK-ARM and Segger Embedded Studio (SES) IDEs for OpenThread stack and all example applications,
  • range of PC tools including a Thread Topology Monitor,
  • software modules inherited from the nRF5 SDK e.g. peripheral drivers, NFC libraries, Bluetooth Low Energy libraries etc.

CryptoCell 310 support

By default, mbedTLS library is built with support for CryptoCell 310 hardware acceleration of cryptographic operations used in OpenThread. You can disable CryptoCell 310 and use software cryptography instead by building OpenThread with the following parameter:

$ make -f examples/Makefile-nrf52840 DISABLE_CC310=1