CLI problem? warning Backends flushed.

[_maibi]

SDK: 15.3.0

I have developed PCA10056 board based on CLI example.

I tried to print debug strings.

but, [00: 00: 32.310,668] <warning> app: Prints backends flushed repeatedly.

and then, uart_cli:~$ input line is disappeared and dead.

how can I solve Backends flushed warning?

at dead, gdb where full - 

#0  0x00007ebc in app_usbd_string_desc_get (idx=0 '\000', langid=0) at ../../../../nRF52_SDK/components/libraries/usbd/app_usbd_string_desc.c:291
        lang_idx = 0 '\000'
        str_pos = 2 '\002'
#1  0x00000000 in ?? ()
No symbol table info available.

[bjorn-spockeli]

It could seem that you are queuing more packets than the logging backend is able to process. 

Snippet from nrf_log_frontend_dequeue(void) in nrf_log_frontend.c

else
{
    //Could not allocate memobj - backends are not freeing them on time.
    nrf_log_backend_t const * p_backend = m_log_data.p_backend_head;
    //Flush all backends
    while (p_backend)
    {
        nrf_log_backend_flush(p_backend);
        p_backend = p_backend->p_cb->p_next;
    }
    NRF_LOG_WARNING("Backends flushed");
}

Could you try to increase the log buffer, i.e. increase 

NRF_LOG_BUFSIZE 

in sdk_config.h?

Best regards

Bjørn

[_maibi]

It is not working... I increase 16384 from 2048.

I guess it is related on Log queue. how can I increase LOG queue? 

I increase some values of log in sdk_config.h file. but It doesn't work...

[bjorn-spockeli]

Hmm, try increasing the 

NRF_LOG_BACKEND_UART_TEMP_BUFFER_SIZE

and possibly 

NRF_LOG_MSGPOOL_ELEMENT_SIZE

in sdk_config.h

Best regards

Bjørn

[_maibi]

I found solution.

attach

UNUSED_RETURN_VALUE(NRF_LOG_PROCESS());
cli_process();

after log print.

[gilbertjuly]

Are these two lines a must?

I don't want to use CLI function, I just want the flash crashlog backend function, but "Backends flushed" message kept showing...