Where can I see NRF_LOG output?

[gary]

I am using nrf51 SDK v.12.1. And I found NRF_LOG_INFO("BLINKY START\n"); where can I find this log? Is this different from SEEGER_WriteString or something?

[FormerMember]

The output from NRF_LOG_xxx can be displayed in a terminal (if logging over UART) or in the J-link RTT viewer (logging over RTT).

The sdk_config.h file --> configuration wizard can be used to choose logging over UART or RTT.

As you can see in nrf_log_backend_serial.c, logging over RTT uses SEGGER_RTT_xxx functions.

Update: Use the configuration wizard tab in sdk_config.h to enable RTT and/or UART logging:

[gary]

Im sorry but I have one more question. If I want to use RTT for debugging, how can configure sdk_config.h. And when I use RTT viewer, it doensn't show the result dynamically (for example, printing some string every second). Does RTT viewer work only when the program is loaded on the board?