Is it possible to use nrf52840dongle_nrf52840 with the peripheral_uart sample?

[Burt]

Hi,

I am able to do some stuff partially using the command

$ west build -b nrf52840dongle_nrf52840 -- -DDTC_OVERLAY_FILE=usb.overlay -DOVERLAY_CONFIG=prj_cdc.conf

With that I see the device using the Scanner in the nRF Connect app on my iPhone. I have a blinking green LED, and when I connect, the other LED turns solid red. I am trying to follow the Testing regimen in the Peripheral UART sample description in the SDK manual. Then I have no luck with logging over RTT. I tried to follow this configuration:

CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_UART_CONSOLE=n

Is this a limitation of the dongle, versus a DK board? Or am I missing something?

Also, when I bring up the J-Link RTT Viewer V8.18 Configuration I do not see a choice "Auto Detection" for the RTT Control Block. Is this because Auto Detection has been removed from the J-Link RTT Viewer? When I look at your SDK manual latest edition, it shows J-Link V6.80a, so I don't know if the documentation you have is up to date or not.

Thanks, I wanted to see how far I could get with a Dongle, as it is what I currently have.

Regards,

Burt

[Burt]

I think I now understand what is needed. I would need to purchase the ARM20 to 10 Pin Plug-of-Nails - No Legs 3-piece solution shown on Segger J-Link cables save PCB cost/space | Tag-Connect for US $86.95 and use that with my JLink probe. So, the inexpensive Dongle becomes not so inexpensive when I want to have some debug capabilities! Drats. Please confirm that I understand the situation correctly at this time. Thanks.

Burt

[Burt]

And I guess it is okay to set CONFIG_LOG_BACKEND_UART=y in prj.conf if I don't mind intermingling data and logging in one console.

[Vidar Berg]

Hello,

I posted a modified version of the peripheral_uart sample that supports the dongle here:  RE: nRF52840 dongle, BLE peripheral_uart example, SDK migration from 2.6.0 to 2.9.0 .  But for any active development we do recommend using a development kit like the nRF52840 DK. 

Dongle product page https://www.nordicsemi.com/Products/Development-hardware/nRF52840-Dongle 

RTT is using the debug interface to transfer the log message and therefore requires a debug probe to read the messages.

Best regards,

Vidar

[Burt]

Thank you very much, Vidar.

Burt