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circuitpython/ports/nrf/boards/nrf52840-mdk-usb-dongle/README.md

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nRF52840 MDK USB Dongle

The nRF52840 MDK USB Dongle is a small, low-cost development board in a USB dongle form-factor powered by an nRF52840 with 1MB flash and 256KB RAM.

This device is pre-installed with Open Bootloader, allowing DFU upgrades over USB using Nordic nRF Connect or nrfutil. To support Open Bootloader, the flash and memory layout must be adjusted slightly (details here) from the typical nRF build; this board definition ensure the appropriate build configuration is used for MicroPython.

Pinout

The pinout diagram provides an overview of the available pins and their capabilities. All pins are available in MicroPython, using the pin numbers labelled in the diagram (excluding the leading port number, P0).

The three LEDs are available either through the usual Pin mechanism - pins 22-24 - or by board.LED(n) where n can be 1, 2 or 3.

Build instructions

Follow the standard nRF Port build instructions; but use nrf52840-mdk-usb-dongle as the value for BOARD:

make BOARD=nrf52840-mdk-usb-dongle

The build artifacts will be created in build-nrf52840-mdk-usb-dongle. Once built, the easiest way to deploy to the device is to open firmware.hex using nRF Connect and select Write. Detailed instructions can be found on the developer wiki.

Note that the regular method of deployment for the MicroPython nRF port (using make deploy) will not operate correctly and will overwrite the bootloader.