This paragraph mostly follow the https://docs.zephyrproject.org/latest/develop/getting_started/index.html
You may need up to 15 GB of space
First of all download 'west'
python3 -m pip install west
Then create some directory and initialize west-zephyr project
mkdir -p ble-zephyr-hci
cd ble-zephyr-hci
west init
west update
After download the zephyr-sdk package
wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.16.8/zephyr-sdk-0.16.8_linux-x86_64.tar.xz
tar xvf zephyr-sdk-0.16.8_linux-x86_64.tar.xz
cd zephyr-sdk-0.16.8
./setup.sh
After such steps you should have something like:
drwxr-xr-x 8 intl intl 4096 июн 23 17:48 .
drwxr-xr-x 13 intl intl 4096 июн 23 04:20 ..
drwxr-xr-x 3 intl intl 4096 июн 23 06:09 bootloader
drwxr-xr-x 9 intl intl 4096 июн 23 06:14 modules
drwxr-xr-x 4 intl intl 4096 июн 23 06:09 tools
drwxr-xr-x 2 intl intl 4096 июн 23 04:34 .west
drwxr-xr-x 24 intl intl 4096 июн 23 07:36 zephyr
drwxr-xr-x 27 intl intl 4096 июн 23 15:29 zephyr-sdk-0.16.8
To build firmware run next commands:
cd zephyr
west build -p always -b nrf52840_mdk_usb_dongle samples/bluetooth/hci_usb
If everything goes successfully, in zephyr/build/zephyr should be located zephyr.hex - which is our firmware itself
Next step - download nrfutil tool, which is located: https://www.nordicsemi.com/Products/Development-tools/nRF-Util After downloading need to assign appropriate permissions to run this tool, and (sic!) install via it other tools
chmod 0755 ./nrfutil
./nrfutil install device
./nrfutil install completion
./nrfutil install nrf5sdk-tools
Then on the dongle need to push 'boot' button (there is only one button) - and put it to the USB, dongle should blink red (that's means DFU mode)
If run:
./nrfutil device device-info
serial_number: <SERIAL>
deviceFamily: NRF52
deviceVersion: NRF52840_AAD0
ramSize: 262144
romPageSize: 4096
romSize: 1048576
Device should be visible in output
To flash already built firmware, first need to convert it to DFU zip file. To do it run:
./nrfutil pkg generate --hw-version 52 --sd-req=0x00 --application zephyr/build/zephyr/zephyr.hex --application-version 1 ble-hci.zip
After this ZIP file could be easily written to the device with:
./nrfutil dfu usb-serial -pkg ble-hci.zip -p /dev/ttyACM0
Now you may use any BLE (not a classic bluetooth) tools
sudo hcitool -i hci1 lescan