[riot-notifications] [RIOT-OS/RIOT] board/feather-nrf52840: add uf2 boot loader (#16276)

Francisco notifications at github.com
Wed Apr 7 20:05:57 CEST 2021

> > And mine is either bricked or I need a JLink to properly unbrick it again (just get a rapidly blinking LED when plugging it into USB and don't get a serial).
> @miri64 did you brick it with this PR? What was on the BOARD before? Did it include the uf2 bootloader?

I flashed the bootloader with a jlink, then at first you need to manually put it into bootlaoder mode, which is done by pushing the reset button twice in a short interval, then a device should get mounted and you can flash a RIOT application. After that the usb_reset code is in and you should be able to flash it without manual intervention (unless the BOARD gets bricked).

But just after flashing the bootloader I indeed have flashing leds, it seems to do that when running the bootlader with no application to jump to...

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