Add support for SparkFun Pro nRF52840 Mini

[charlesportwoodii]

Adds support for the SparkFun Pro nRF52840 Mini.

SparkFun's documentation says this chip uses a bootloader "heavily based upon" this one. I wasn't able to find the actual bootloader hex they used or the changes they made though, so after spending around a week trying to fix a bad flash from the factory I wanted see if we could get this "officially" supported.

I've tried to keep the setup in-line with what SparkFun has in their documentation.

The board has only a single blue LED and primarily can be reset via the double-reset trigger. SparkFun's documentation also states that you can reset it via PIN13 + RST and by grounding PIN 2. I've verified all 3 reset methods.

Please let me know if you'd like to see any changes before merging this in. Thanks!

[tannewt]

@jimblom worked on this for SparkFun I believe.

[ladyada]

tagging also @santised @edspark

[judepereira]

@charlesportwoodii I'm gonna give this a shot, since I need to build a boot loader for an S340 SoftDevice profile.

[charlesportwoodii]

@judepereira Ok. As an FYI if you need something that supports nordic secure bootloader I have a separate fork over at https://github.com/charlesportwoodii/kaidyth_nrf52_bootloader that handles that.

[judepereira]

Thanks, not looking for the secure boot right now.

[charlesportwoodii]

The flashing instructions do not differ from the ones outlined in the project readme: https://github.com/adafruit/Adafruit_nRF52_Bootloader#how-to-compile-and-build

[judepereira]

Got it, trying it out.

[charlesportwoodii]

I don't, and this MR is probably the wrong place to open this discussion at.

This MR is to add support for Sparkfun Pro nRF52840 Mini. If you want to support ANT/s340 SD within the Adafruit bootloader I recommend you open a issue with the project maintainers to see if support for that can be added.

[judepereira]

I can confirm that this works on the SparkFun nRF52840 board. Just flashed the s340 soft device, and the BSC (bicycle speed and cadence) example works.

[hathach]

closed due to lack of activities