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.

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.

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.

Frameworks¶