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Adafruit nRF52840 Bootloader

This repository contains the USB bootloader for Adafruit nRF52840 boards (1MB flash, 256KB SRAM). This repository depend on the tinyusb as submodule, after cloing this repo you need to run this command

git submodule update --init

Build with makefile

Navigate to src/singlebank (recommended) or src/dualbank (work in progress), and use feather52840 target for building bootloader.

make feather52840

To flash bootloader + S140

make flash_feather52840

To only flash S140

make flash_sd

Build using Segger Embeded Studio

For better debugging you can also use SES, The project file is located at src/segger/nrf52840_bootloader.emProject. Note: the SES only flash the bootloader when you click download, you need to flash Softdevice beforehand if you haven't done so ( use make flash_sd mentioned above )