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:

[FormerMember]

Which example are you testing, ble_app_blinky? Do you use nRF51 or nrf52?

There is a bug with the nrf_log module that is uses too much ram. This post reports the bug and a proposed fix.