Add support for nRF52840 USB Dongle #118
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Based on nRF52840-DK board, only supports Zephyr.
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The nRF52840 Dongle is small USB key commonly used with nRF Connect, although apps can be built for it using Zephyr OS.
(Arduino and Mbed don't support this board)
It doesn't come with a JTAG debugger of any sort, thus DFU is the only method supported for programming.
DFU uploads are performed using
nrfutil, which can be installed using Python's package manager and simply issuingpip install nrfutilcommand.For development purposed I manually installed nrfutil in PlatformIO's virtual environment and the upload works, but a custom tool (tool-nrfutil maybe?) might be more appropriate.
I didn't tried with Adafruit's nrfutil fork (which can already be installed through PlatformIO).
Problems
Using nrfutil vanilla I can't seem to generate a valid DFU package when selecting a SoftDevice version different from 0x00.
When generating a DFU package, the application versions string is required. How can I get a custom value from platformio.ini or provide a default one otherwise?