NRF54H20 DK RTT viewer and board don't work

[jheissererHEND]

Hi all!

I have the NRF54H20 D and somehow the RTT viewer doesn’t work, the board doesn’t work. I am using the most simple zephyr hello world project. It says it is compatible with the NRF54H20 DK. I tried on the nRf54L15 DK and it worked fine. Of course I turned on the console log and rtt viewer in the conf file.

Here is my config:

CONFIG_UART_CONSOLE=y
CONFIG_LOG=Y
CONFIG_USE_SEGGER_RTT=Y CONFIG_CONSOLE=y
CONFIG_RTT_CONSOLE=y
When I connect to the RTT viewer, I see the led blinking fast on the board but nothing happens. I made it work without any problems with the nRf54L15 DK.

Can someone help me ? Thank you

[runsiv]

Hi 

Which version of NCS are you using? 

Regards

Runar

[jheissererHEND]

Hi!

Sorry for not mentioning. I am using the latest version, v3.0.2.

[runsiv]

Thanks. 

So RTT would only work for the app core. If you wish to log for more cores you should use STM traces as described here. This is in general the recommended way. 

To use RTT you can do like this where step 1 would be to compile your application

Regards

Runar

[jheissererHEND]

Hi!

This is still not working for some reason. I get "LOG: RTT Viewer connected." But nothing is being displayed on the terminal.

[runsiv]

I suspect is the config_uart_console that causes issues for you. If I removed it works like a charm. I would start by just putting it to n to see if it works

Regards

Runar

[jheissererHEND]

It's still not working. I think I might have a problem with my setup or something. I am working on VScode with the nrf connect extension. Like I don't even see my LED blinking on the DK.
Can you help me setting up my environment and my project ?

Could you send me a project that works ? Thank you

[runsiv]

7870.blinky.zipI used the zephyr/samples/basic/blink and added the following Kconfigs. Nothing else was touched. 

CONFIG_UART_CONSOLE=n
CONFIG_USE_SEGGER_RTT=y
CONFIG_CONSOLE=y
CONFIG_RTT_CONSOLE=y

Which version of NCS are you using? In general I would recommend to use west flash --recover when working 54H20 if it is using SUIT. 

Regards

Runar