NRF54L15 DK soft bricked?

RE: NRF54L15 DK soft bricked?

Einar Thorsrud — Mon, 14 Apr 2025 12:27:52 GMT

Hi,

With "Blink" sample, do you refer to the basic blinky sample, or another? Can you backtrack and make sure you test the unmodified sample from an unmodified SDK?

Also, as you write that the first symptom was no UART logs, I wonder if you disabled the UART in the interface MCU (onboard debugger) in the board configuration? Can you show the board configurator configuration as it is currently?

RE: NRF54L15 DK soft bricked?

Elppu — Fri, 11 Apr 2025 13:06:25 GMT

But blink alone even without logs should work? I tried this conf with no luck:

CONFIG_MPSL_WORK_STACK_SIZE=4096
CONFIG_GPIO=y

CONFIG_USE_SEGGER_RTT=y

CONFIG_LOG_BACKEND_RTT=y

CONFIG_SEGGER_RTT_BUFFER_SIZE_UP= 4096 

CONFIG_SEGGER_RTT_BUFFER_SIZE_DOWN=64
CONFIG_SEGGER_RTT_MODE_NO_BLOCK_SKIP=y


# General config
CONFIG_LOG=y
CONFIG_LOG_DEFAULT_LEVEL=4
CONFIG_LOG_MODE_DEFERRED=y

# Stack 
CONFIG_MAIN_STACK_SIZE=12000
CONFIG_MPSL_WORK_STACK_SIZE=12000

RE: NRF54L15 DK soft bricked?

Turbo J — Fri, 11 Apr 2025 13:01:01 GMT

Try CONFIG_LOG_MODE_DEFERRED=y or increase all those stack sizes quite a bit in the config.

Debug logs take tons of stack space for the printf() formatting.