Flash a nrf52840dk sniffer board

[Ying]

I programmed a nrf52840dk board (PCA10056 3.0.0 2022.7 1050288497) as a sniffer. It works well.

Now I want to flash it to zephyr samples/basic/blinky by "west flash".
west flash
-- west flash: rebuilding
ninja: no work to do.
-- west flash: using runner nrfjprog
-- runners.nrfjprog: reset after flashing requested
FATAL ERROR: Unable to find a board; is the board connected?

ls -hal /dev/serial/by-id

usb-ZEPHYR_nRF_Sniffer_for_Bluetooth_LE_49F8F9D7E8AE3B9E-if00 -> ../../ttyACM0

I tried to hold RESET button and cycled the power but it still ran into sniffer.

Thanks!

[Ying]

Hi Kenneth,

Thank you very much for your time on this issue.

The board is a nRF52840-DK board as I mentioned PCA10056). Thanks!

[Kenneth]

Hi,

Sorry, for some reason I though you were using the nRF52840 USB dongle, since that is the one I use most as BLE sniffer.

Can you show me how you have connected the nRF52840-DK, and also how you managed to program the sniffer firmware?

If you run for instance "nrfjprog --version" in command line, what does it output? If you haven't already, make sure to follow: https://academy.nordicsemi.com/courses/nrf-connect-sdk-fundamentals/lessons/lesson-1-nrf-connect-sdk-introduction/ (in specific Exercise 1 that show what you should install)

Kenneth

[Ying]

USB cable is connected to the "nRF USB" port next to the "IF BOOT/RESET" button.

After plug in the board, dmesg shows:

[ +6.918874] usb 3-2: new full-speed USB device number 6 using xhci_hcd
[ +0.253505] usb 3-2: New USB device found, idVendor=1915, idProduct=522a, bcdDevice= 2.04
[ +0.000009] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ +0.000001] usb 3-2: Product: nRF Sniffer for Bluetooth LE
[ +0.000001] usb 3-2: Manufacturer: ZEPHYR
[ +0.000001] usb 3-2: SerialNumber: 49F8F9D7E8AE3B9E
[ +0.003185] cdc_acm 3-2:1.0: ttyACM0: USB ACM device

ls -hal /dev/serial/by-id
total 0
drwxr-xr-x 2 root root 60 Nov 25 14:29 .
drwxr-xr-x 4 root root 80 Nov 25 14:29 ..
lrwxrwxrwx 1 root root 13 Nov 25 14:29 usb-ZEPHYR_nRF_Sniffer_for_Bluetooth_LE_49F8F9D7E8AE3B9E-if00 -> ../../ttyACM0

nrfjprog --version
nrfjprog version: 10.24.2 external
JLinkARM.dll version: 7.94e

source ~/zephyrproject/.venv/bin/activate
cd ~/zephyrproject/zephyr
west build -p -b nrf52840dk/nrf52840 samples/basic/blinky
...
[3/135] Generating include/generated/zephyr/version.h
-- Zephyr version: 4.0.0-rc3 (/home/yc/zephyrproject/zephyr), build: v4.0.0-rc3-227-g9ffc4b1df8a7
[135/135] Linking C executable zephyr/zephyr.elf
Memory region Used Size Region Size %age Used
FLASH: 18732 B 1 MB 1.79%
RAM: 5696 B 256 KB 2.17%
IDT_LIST: 0 GB 32 KB 0.00%
Generating files from /home/yc/zephyrproject/zephyr/build/zephyr/zephyr.elf for board: nrf52840dk

west flash
-- west flash: rebuilding
ninja: no work to do.
-- west flash: using runner nrfjprog
-- runners.nrfjprog: reset after flashing requested
FATAL ERROR: Unable to find a board; is the board connected?

Then I tried to hold the IF BOOT/RESET button and unplug/plug the USB cable to reboot. The board has no change.

I'm wondering how I can flash the board back to MCUBoot mode or other program so that I can use west flash.

Thanks!