nRF52 DK

Caution

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Tip

When using this board with RIOT, set the BOARD variable to nrf52dk 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 ?= nrf52dk

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

include $(RIOTBASE)/Makefile.include

Support for the nRF52 DK

Overview:

The nRF52 DK is a development board featuring the nRF52832 MCU with Arduino compatible pin headers and an integrated J-Link programmer, debugger and UART adapter.

Hardware:

MCU	NRF52832
Family	ARM Cortex-M4F
Vendor	Nordic Semiconductor
RAM	64 KiB
Flash	512 KiB
Frequency	64 MHz
FPU	yes
Timers	5 (32-bit)
RTC	3
ADCs	1x 12-bit (8 channels)
UARTs	1
SPIs	3
I2Cs	2
I2S	1
PWM	3*4 Channels
Radio	2.4GHz BLE compatiple, -20 dBm to +4 dBm output, -96 dBm RX sensitivity
Vcc	1.7V - 3.6V
MCU Datasheet	Datasheet
MCU Reference Manual	Reference Manual
Board Datasheet	User Guide

RESET pin configuration

On many (all?) nrf52dk boards, the reset pin is not configured out-of-the box. This means, that simply nothing happens if the RESET pin is pressed. To change this, RIOT provides a little tool in dist/tools/nrf52_resetpin_cfg.

Simply compile, flash, and run that tool on your board, and the reset pin should work for the time being.

Current measurement:

There are two pins for current measurement on board. Don’t connect these pins to GND!. The left pin is at 3.3V level and the right pin is connected to V33. Divide the measured voltage between this pins by 22 to get the current.

Flash the board

See the Flashing section in boards_common_nrf52.

Accessing STDIO via UART

The STDIO is directly accessible via the USB port. On a Linux host, it’s generally mapped to /dev/ttyACM0.

Use the term target to connect to the board serial port

    make BOARD=nrf52dk -C examples/basic/hello-world term