RE: about nsc logging

Menon — Tue, 21 Oct 2025 12:15:00 GMT

Hello,

[quote user=""]After using LOG_INFto output logs, I feel the logs are not output immediately. Since I have enabled CONFIG_LOG_MODE_DEFERRED=y, I can understand this phenomenon. However, some logs are even delayed by about one second before output, which doesn't look ideal. I want to ask: in the nRF5 SDK (52 series), I could call NRF_LOG_PROCESS()in the main function's while(1) loop to quickly flush logs. How can I achieve quick log flushing in NCS?[/quote]

I think you can use the log_flush() function from Zephyr, which processes all pending log messages and flushes them immediately. check the implementation and details in the Zephyr source.

[quote user=""]Even though I have enabled CONFIG_LOG_MODE_DEFERRED=y, the LOG_INFoperation itself still takes quite some time. I tested it with GPIO and found it takes up to 20-30 us. This makes it inconvenient for me to use LOG_INFin interrupt service routines. I remember when using Segger debugging with nRF5 SDK (52833), even with LOG_DEFERREDenabled, NRF_LOG_INFOonly took about 1-2 us. So in NCS, are there any methods to optimize the log operation time? What additional steps should I take?[/quote]

For the speed optimization, could you include the following configs and let me know if it makes any difference?

CONFIG_LOG=y
CONFIG_LOG_MODE_DEFERRED=y
CONFIG_LOG_SPEED=y
CONFIG_LOG_SIMPLE_MSG_OPTIMIZE=y
CONFIG_LOG_BUFFER_SIZE=4096
CONFIG_LOG_MODE_OVERFLOW=y

CONFIG_LOG_RATELIMIT=y
CONFIG_LOG_RATELIMIT_INTERVAL_MS=500

Kind Regards,

Abhijith

RE: about nsc logging

Liny — Wed, 15 Oct 2025 02:06:45 GMT

sdk ncs 3.0.2 ,its NRF54L15DK,

RE: about nsc logging

Menon — Tue, 14 Oct 2025 12:08:34 GMT

Hello,

Could you please tell me which SDK version you are using? Also, is this a custom board or a DK? Could you also please specify which Nordic chip or DK you are working with.

Kind regards,
Abhijith