Cant get J-Link RTT Viewer to show log information

[Robin]

Hello again Nordic Pros,

I am trying to get some debug logging going using the 52DK running ble uart central under SDK 12.3 and RTT Viewer v6.4.

I have setup config.h as such:

and added this line to test getting a log with each RX event:

...
        case BLE_NUS_C_EVT_NUS_RX_EVT:
            NRF_LOG_DEBUG ("TEST!\r\n");
...

Yet there are no logs in any RTT Viewer Window when characters are sent via BLE.

What am I missing here?

Robin @ TL

I now have RTT-Viewer showing logs.  However, there are 2 problems:

1.) If I turn on timestamping, my board hangs,

2.) When logging is enabled, I cannot command the board via the terminal.

Any suggestions on how to remedy this issues is greatly appreciated!

Thanks 

Robin @ TL

[Robin]

OK, for those who want to know... 

I have RTT Viewer up and running, even on our 51 based custom board.  I am able to log messages while maintaining a UART->BLE->TARGET command/response link up.  Here is the test system comm path:

        51_based_custom_ble_uart_peripheral<->ble<->52DK_ble_uart_central<->USB_UART<->PC<->termite_terminal:                                                                                                                                                                                      |->RTT_Viewer.

Both boards are running under SDK 12.3.

Here is what I had to do:

1.) Configure NRF_Logging in config.h:

2.) Add the following preprocessor definition:

    NRF_LOG_USES_RTT=1

3.) Add the following includes:

    #include "nrf_log.h"
    #include "nrf_log_ctrl.h"

4.) Add the following define:

    #define NRF_LOG_MODULE_NAME "iDrink"

5.) And, finally add the following log initialization macro:

     NRF_LOG_INIT(NULL);

This is an amazing powerful tool for real time debugging in code tracing.  I hope this helps someone else in need of such capabilities.

Thanks all for your help,

Robin @ TL