NRF_LOG cann't print out.

Hi,

I study on Thread resently.

I found it is not any output in the Debug Terminal Window when using NRF_LOG_XXX,  but the J-link Control panel showed the logs.

Here is my configurations:

SDK: nRF5_SDK_for_Thread_and_Zigbee_v3.2.0_9fade31

Example: examples\thread\mqttsn_client_publisher

IDE: SEGGER Embedded Studio for ARM Release 4.30c  Build 2019120200.40763 Windows x64

sdk_config.h :

// <h> nRF_Log 

//==========================================================
// <e> NRF_LOG_BACKEND_RTT_ENABLED - nrf_log_backend_rtt - Log RTT backend
//==========================================================
#ifndef NRF_LOG_BACKEND_RTT_ENABLED
#define NRF_LOG_BACKEND_RTT_ENABLED 1
#endif
// <o> NRF_LOG_BACKEND_RTT_TEMP_BUFFER_SIZE - Size of buffer for partially processed strings. 
// <i> Size of the buffer is a trade-off between RAM usage and processing.
// <i> if buffer is smaller then strings will often be fragmented.
// <i> It is recommended to use size which will fit typical log and only the
// <i> longer one will be fragmented.

#ifndef NRF_LOG_BACKEND_RTT_TEMP_BUFFER_SIZE
#define NRF_LOG_BACKEND_RTT_TEMP_BUFFER_SIZE 64
#endif

// <o> NRF_LOG_BACKEND_RTT_TX_RETRY_DELAY_MS - Period before retrying writing to RTT 
#ifndef NRF_LOG_BACKEND_RTT_TX_RETRY_DELAY_MS
#define NRF_LOG_BACKEND_RTT_TX_RETRY_DELAY_MS 1
#endif

// <o> NRF_LOG_BACKEND_RTT_TX_RETRY_CNT - Writing to RTT retries. 
// <i> If RTT fails to accept any new data after retries
// <i> module assumes that host is not active and on next
// <i> request it will perform only one write attempt.
// <i> On successful writing, module assumes that host is active
// <i> and scheme with retry is applied again.

#ifndef NRF_LOG_BACKEND_RTT_TX_RETRY_CNT
#define NRF_LOG_BACKEND_RTT_TX_RETRY_CNT 3
#endif

// </e>

// <e> NRF_LOG_ENABLED - nrf_log - Logger
//==========================================================
#ifndef NRF_LOG_ENABLED
#define NRF_LOG_ENABLED 1
#endif
// <h> Log message pool - Configuration of log message pool

//==========================================================
// <o> NRF_LOG_MSGPOOL_ELEMENT_SIZE - Size of a single element in the pool of memory objects. 
// <i> If a small value is set, then performance of logs processing
// <i> is degraded because data is fragmented. Bigger value impacts
// <i> RAM memory utilization. The size is set to fit a message with
// <i> a timestamp and up to 2 arguments in a single memory object.

#ifndef NRF_LOG_MSGPOOL_ELEMENT_SIZE
#define NRF_LOG_MSGPOOL_ELEMENT_SIZE 20
#endif

// <o> NRF_LOG_MSGPOOL_ELEMENT_COUNT - Number of elements in the pool of memory objects 
// <i> If a small value is set, then it may lead to a deadlock
// <i> in certain cases if backend has high latency and holds
// <i> multiple messages for long time. Bigger value impacts
// <i> RAM memory usage.

#ifndef NRF_LOG_MSGPOOL_ELEMENT_COUNT
#define NRF_LOG_MSGPOOL_ELEMENT_COUNT 8
#endif

// </h> 
//==========================================================

// <q> NRF_LOG_ALLOW_OVERFLOW  - Configures behavior when circular buffer is full.
 

// <i> If set then oldest logs are overwritten. Otherwise a 
// <i> marker is injected informing about overflow.

#ifndef NRF_LOG_ALLOW_OVERFLOW
#define NRF_LOG_ALLOW_OVERFLOW 1
#endif

// <o> NRF_LOG_BUFSIZE  - Size of the buffer for storing logs (in bytes).
 

// <i> Must be power of 2 and multiple of 4.
// <i> If NRF_LOG_DEFERRED = 0 then buffer size can be reduced to minimum.
// <128=> 128 
// <256=> 256 
// <512=> 512 
// <1024=> 1024 
// <2048=> 2048 
// <4096=> 4096 
// <8192=> 8192 
// <16384=> 16384 

#ifndef NRF_LOG_BUFSIZE
#define NRF_LOG_BUFSIZE 1024
#endif

// <q> NRF_LOG_CLI_CMDS  - Enable CLI commands for the module.
 

#ifndef NRF_LOG_CLI_CMDS
#define NRF_LOG_CLI_CMDS 0
#endif

// <o> NRF_LOG_DEFAULT_LEVEL  - Default Severity level
 
// <0=> Off 
// <1=> Error 
// <2=> Warning 
// <3=> Info 
// <4=> Debug 

#ifndef NRF_LOG_DEFAULT_LEVEL
#define NRF_LOG_DEFAULT_LEVEL 4
#endif

// <q> NRF_LOG_DEFERRED  - Enable deffered logger.
 

// <i> Log data is buffered and can be processed in idle.

#ifndef NRF_LOG_DEFERRED
#define NRF_LOG_DEFERRED 1
#endif

// <q> NRF_LOG_FILTERS_ENABLED  - Enable dynamic filtering of logs.
 

#ifndef NRF_LOG_FILTERS_ENABLED
#define NRF_LOG_FILTERS_ENABLED 0
#endif

// <q> NRF_LOG_NON_DEFFERED_CRITICAL_REGION_ENABLED  - Enable use of critical region for non deffered mode when flushing logs.
 

// <i> When enabled NRF_LOG_FLUSH is called from critical section when non deffered mode is used.
// <i> Log output will never be corrupted as access to the log backend is exclusive
// <i> but system will spend significant amount of time in critical section

#ifndef NRF_LOG_NON_DEFFERED_CRITICAL_REGION_ENABLED
#define NRF_LOG_NON_DEFFERED_CRITICAL_REGION_ENABLED 0
#endif

// <o> NRF_LOG_STR_PUSH_BUFFER_SIZE  - Size of the buffer dedicated for strings stored using @ref NRF_LOG_PUSH.
 
// <16=> 16 
// <32=> 32 
// <64=> 64 
// <128=> 128 
// <256=> 256 
// <512=> 512 
// <1024=> 1024 

#ifndef NRF_LOG_STR_PUSH_BUFFER_SIZE
#define NRF_LOG_STR_PUSH_BUFFER_SIZE 128
#endif

// <o> NRF_LOG_STR_PUSH_BUFFER_SIZE  - Size of the buffer dedicated for strings stored using @ref NRF_LOG_PUSH.
 
// <16=> 16 
// <32=> 32 
// <64=> 64 
// <128=> 128 
// <256=> 256 
// <512=> 512 
// <1024=> 1024 

#ifndef NRF_LOG_STR_PUSH_BUFFER_SIZE
#define NRF_LOG_STR_PUSH_BUFFER_SIZE 128
#endif

// <e> NRF_LOG_USES_COLORS - If enabled then ANSI escape code for colors is prefixed to every string
//==========================================================
#ifndef NRF_LOG_USES_COLORS
#define NRF_LOG_USES_COLORS 0
#endif
// <o> NRF_LOG_COLOR_DEFAULT  - ANSI escape code prefix.
 
// <0=> Default 
// <1=> Black 
// <2=> Red 
// <3=> Green 
// <4=> Yellow 
// <5=> Blue 
// <6=> Magenta 
// <7=> Cyan 
// <8=> White 

#ifndef NRF_LOG_COLOR_DEFAULT
#define NRF_LOG_COLOR_DEFAULT 0
#endif

// <o> NRF_LOG_ERROR_COLOR  - ANSI escape code prefix.
 
// <0=> Default 
// <1=> Black 
// <2=> Red 
// <3=> Green 
// <4=> Yellow 
// <5=> Blue 
// <6=> Magenta 
// <7=> Cyan 
// <8=> White 

#ifndef NRF_LOG_ERROR_COLOR
#define NRF_LOG_ERROR_COLOR 2
#endif

// <o> NRF_LOG_WARNING_COLOR  - ANSI escape code prefix.
 
// <0=> Default 
// <1=> Black 
// <2=> Red 
// <3=> Green 
// <4=> Yellow 
// <5=> Blue 
// <6=> Magenta 
// <7=> Cyan 
// <8=> White 

#ifndef NRF_LOG_WARNING_COLOR
#define NRF_LOG_WARNING_COLOR 4
#endif

// </e>

// <e> NRF_LOG_USES_TIMESTAMP - Enable timestamping

// <i> Function for getting the timestamp is provided by the user
//==========================================================
#ifndef NRF_LOG_USES_TIMESTAMP
#define NRF_LOG_USES_TIMESTAMP 0
#endif
// <o> NRF_LOG_TIMESTAMP_DEFAULT_FREQUENCY - Default frequency of the timestamp (in Hz) or 0 to use app_timer frequency. 
#ifndef NRF_LOG_TIMESTAMP_DEFAULT_FREQUENCY
#define NRF_LOG_TIMESTAMP_DEFAULT_FREQUENCY 0
#endif

// </e>

// <h> nrf_log module configuration 

main.c:

/**@brief Function for initializing the nrf log module.
 */
static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}



....



/***************************************************************************************************
 * @section Main
 **************************************************************************************************/

int main(int argc, char *argv[])
{
    log_init();
    scheduler_init();
    timer_init();
    leds_init();

    thread_instance_init();
    thread_bsp_init();
    mqttsn_init();

    NRF_LOG_INFO("start...");

    while (true)
    {
        thread_process();
        app_sched_execute();

        if (NRF_LOG_PROCESS() == false)
        {
            thread_sleep();
        }
    }
}

screenshots:

Debug Terminal WindowJlink Control Panel

It something wrong with the debug terminal window?

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