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

benpicco notifications at github.com
Fri May 8 10:15:49 CEST 2020

@benpicco 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 of course will only work if RIOT didn’t crash, as the reset is triggered by the USB stack)

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