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micropython/ports/nrf/boards/nrf52840-mdk-usb-dongle
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Glenn Ruben Bakke d0b8554df4 nrf: Change selected boards to utilize pre-flashed bootloader. 
The nrf52840-mdk-usb-dongle and pca10050 comes with a pre-flashed
bootloader (OpenBootloader).

This commit updates the boards "mpconfigboard.mk" to use DFU as
default flashing method and set the corresponding BOOTLOADER
settings such that nrf52840_open_bootloader_1.2.x.ld linker
script is used.

The default DFU flashing method can be disabled by issuing "DFU=0"
when invoking make. This will lead to "segger" being used as default
flashing tool. When using "DFU=0", the linker scripts will not
compensate for any MBR and Bootloader region being present, and might
overwrite them if they were present.

The commit also removes the custom linker script specific to
nrf52840-mdk-usb-dongle as it now points to a generic.

Updated nrf52840-mdk-usb-dongle's README.md to be more clear on
how to deploy the built firmware.

The port README.md has also been updated. In the list of target
boards a new column has been added to indicate which bootloader
is present on the target board. And for consistency, changed all
examples in the README.md to use "deploy" instead of "flash".
 		2020-12-07 20:04:50 +01:00
..
README.md nrf: Change selected boards to utilize pre-flashed bootloader. 2020-12-07 20:04:50 +01:00
mpconfigboard.h nrf: Add board definition for nRF52840-MDK-USB-Dongle. 2020-07-16 23:47:13 +10:00
mpconfigboard.mk nrf: Change selected boards to utilize pre-flashed bootloader. 2020-12-07 20:04:50 +01:00
pins.csv nrf: Add board definition for nRF52840-MDK-USB-Dongle. 2020-07-16 23:47:13 +10:00

README.md

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 target can be deployed to the device as described in nRFUtil targets.

An alternative 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.