Metro nRF52840 Express

Hardware

Platform Nordic nRF52: The nRF52 Series are built for speed to carry out increasingly complex tasks in the shortest possible time and return to sleep, conserving precious battery power. They have a Cortex-M4F processor which makes them quite capable Bluetooth Smart SoCs.

Microcontroller	NRF52840
Frequency	64MHz
Flash	796KB
RAM	243KB
Vendor	Adafruit

Configuration

Please use adafruit_metro_nrf52840 ID for board option in “platformio.ini” (Project Configuration File):

[env:adafruit_metro_nrf52840]
platform = nordicnrf52
board = adafruit_metro_nrf52840

You can override default Metro nRF52840 Express settings per build environment using board_*** option, where *** is a JSON object path from board manifest adafruit_metro_nrf52840.json. For example, board_build.mcu, board_build.f_cpu, etc.

[env:adafruit_metro_nrf52840]
platform = nordicnrf52
board = adafruit_metro_nrf52840

; change microcontroller
board_build.mcu = nrf52840

; change MCU frequency
board_build.f_cpu = 64000000L

Uploading

Metro nRF52840 Express supports the following uploading protocols:

• blackmagic

• cmsis-dap

• jlink

• nrfjprog

• nrfutil

• stlink

Default protocol is nrfutil

You can change upload protocol using upload_protocol option:

[env:adafruit_metro_nrf52840]
platform = nordicnrf52
board = adafruit_metro_nrf52840

upload_protocol = nrfutil

Debugging

Debugging - “1-click” solution for debugging with a zero configuration.

Warning

You will need to install debug tool drivers depending on your system. Please click on compatible debug tool below for the further instructions and configuration information.

You can switch between debugging Tools & Debug Probes using debug_tool option in “platformio.ini” (Project Configuration File).

Metro nRF52840 Express does not have on-board debug probe and IS NOT READY for debugging. You will need to use/buy one of external probe listed below.

Compatible Tools	On-board	Default
Black Magic Probe		Yes
CMSIS-DAP
J-LINK
ST-LINK

Frameworks

Name	Description
Arduino	Arduino Wiring-based Framework allows writing cross-platform software to control devices attached to a wide range of Arduino boards to create all kinds of creative coding, interactive objects, spaces or physical experiences.