[riot-notifications] [RIOT-OS/RIOT] boards: add support for nrf52840-dongle (#13146)

chrysn notifications at github.com
Fri May 8 10:32:03 CEST 2020

@chrysn commented on this pull request.

> +
+### Links
+- [nRF52840 web page](https://www.nordicsemi.com/?sc_itemid=%7BCDCCA013-FE4C-4655-B20C-1557AB6568C9%7D)
+- [documentation and hardware description](https://infocenter.nordicsemi.com/topic/ug_nrf52840_dongle/UG/nrf52840_Dongle/intro.html?cp=3_0_5)
+### Flash the board
+The board is flashed using its on-board boot loader; the
+[nrfutil](https://github.com/NordicSemiconductor/pc-nrfutil) program needs to
+be installed. That can turn the binary into a suitable zip file and send it to the
+The process is automated in the usual `make flash` target. For that process to
+complete, you need to enter the bootloader manually by pressing the board's
+reset button. Readiness of the bootloader is indicated by LD2 pulsing in red.

That would only be the case if FEATURES_REQUIRED += bootloader_nrfutil / USEMODULE += usb_board_reset were set like in adafruit-clue (along with the usb_board_reset_in_bootloader from there), and I'd prefer not to introduce that hack onto platforms where it's not the default convention of the hardware.

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