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

Alexandre Abadie notifications at github.com
Fri May 8 12:28:38 CEST 2020

> it's abusing a well-defined USB interface as a transport for something that is not announced in USB descriptors

It's just reusing the stdio USB descriptor. So I don't see any abuse here since the USB stack in RIOT can automatically adapt to any baudrate requested on stdio. I would rather put this in the _hack_ category.

> My guess would be that it's the same for all nrfutil bootloaders

I don't think so. The nrfutil bootloader in adafruit-clue is in fact adafruit-nrfutil and it's not compatible with the Nordic nrfutil (...), so the implemenation is probably not compatible. I just wanted initially to limit the number of bootloader module/feature names as it's more a build system thing.
We are also already supporting several Arduino bootloaders which are incompatible (samd21, nrf52) but I kept the same name.

> I see three possible solutions for that

I'm a sorry but all three are wrong. What's the problem with https://github.com/RIOT-OS/RIOT/pull/13146/files/981c1411d4dff28848f4ce85d2306ec89b5396d5#diff-62d41b596b7713257c78acbe1b8616fd ?

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