Adafruit Feather nRF52840 Express

Caution

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Tip

When using this board with RIOT, set the BOARD variable to adafruit-feather-nrf52840-express in your Makefile. If you follow the standard RIOT project structure, your Makefile should look like this:

./Makefile

# name of your application
APPLICATION = hello-world

# Change this to your board if you want to build for a different board
BOARD ?= adafruit-feather-nrf52840-express

# This has to be the absolute path to the RIOT base directory:
RIOTBASE ?= $(CURDIR)/RIOT

include $(RIOTBASE)/Makefile.include

Support for the Adafruit Feather nRF52840 Express

General information

The Feather nRF52840 Express is a development board from Adafruits Feather board family. It provides native USB support, Bluetooth Low Energy and IEEE 802.15.4 support via the nRF52840 MCU.

Flash the board

Flashing the Feather nRF52840 is described in the common Adafruit nRF52 Bootloader section.

Example with hello-world application:

make BOARD=adafruit-feather-nrf52840-express -C examples/basic/hello-world flash

Terminal

To connect a terminal to the Feather, RIOT chooses stdio_cdc_acm per default. This lets you access the Feather directly over USB.

You have several alternative possibilities to connect to the board.

1. With

   USEMODULE += stdio_uart

   and an FTDI adapter connected to the Feather’s RX and TX ports you can use UART-based terminals to connect to the feather
2. With

   USEMODULE += stdio_rtt

   you can use the Segger J-Link Programmer as a serial interface to the device.