• nRF52840
• ARM M4 64 MHz
• 1024 KB ROM - 256 KB RAM
• Bluetooth 5, Mesh
• 802.15.4, Thread, Zigbee
• USB 2 GetStarted)

Applications #

• custom mesh coordinator

nRF52840 Dongle #

Pinout #

Serial Wire Debug #

• the usb dongle is referred to as PCA10059 which in projects usually shifts the app to offset 0x1000 as openbootloader usage is expected
• With serial wire debug, it’s possible to flash applications at same address as the PCA10056 which is at address 0x0000

LEDS #

• LED1 Green : P0.06
• LED2 Green : P0.08
• LED2 Green : P1.09
• LED2 Blue : P0.12

pogo pin adapter #

• Pogo Pin P75-E2 Dia 1.3mm Length 16.5mm

micro python #

gallery #

bootloader #

options #

• nRF SDK v16.0.0 bootloader
• Nording nRF52840 Dongle tutorial
• MCU boot - zephyr bootloader
• UF2 bootloader

recovery #

• on nRF SDK recovering the openbootloader mode would then require to reflash the MBR with any project make flash_mbr

• without nRF SDK, download the bootloader from the nordic tutorial and rename to pca10059_bootloader.hex

then run

J-Link>Power on
cd pca10059_bootloader
>nrfjprog -f nrf52 --eraseall
 >nrfjprog -f nrf52 --chiperase --program pca10059_bootloader.hex --verify --reset

build for USB DFU #

on any sample from nRF Connect that supports the nrf52840dongle_nrf52840 run

cd nrf\v2.3.0\nrf\samples\xxx\
>west build -p always -b nrf52840dongle_nrf52840 -- -DOVERLAY_CONFIG="overlay-usb.conf" -DDTC_OVERLAY_FILE="usb.overlay"

USB DFU command line #

It is possible to use the nRF Connect programmer, but to perform the same with command line, you need to generate a package the flash it as follows

>nrfutil pkg generate --hw-version 52 --sd-req=0x00 --application build/zephyr/zephyr.hex --application-version 1 build/zephyr/zephyr.zip
nrfutil dfu usb-serial -pkg build/zephyr/zephyr.zip -p COM8