Cannot see NRF_LOG_INFO in Segger Embedded Studio

[Gatze]

I can find some other topics about this:

Like this one:

https://devzone.nordicsemi.com/f/nordic-q-a/43370/nrf_log_info-and-printf-does-not-work

or this article:

https://westsideelectronics.com/getting-logging-to-work-in-segger-embedded-studio/

But the problem is, I can not find the define:

NRF_LOG_BACKEND_RTT_ENABLED

Should I just replace config_sdk.h with another file with the right defines ?

Using the blinky example.

[Gatze]

I'm bit irritated, just thinking why aren't these things documentated, as a customer I want to concentrate on the application not 'just' getting the logging to work.....

But anyway....

I thought sdk_config.h is for every project the same and you can define or undefine on what you need for the project, but this isn't the case. So I took another sample project, ble_app_uart project.

Eventually I stripped it down to just get the LOG working to this:

static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}

int main(void)
{
  log_init();
  

  NRF_LOG_INFO("Initalization done");

  // Enter main loop.
  for (;;)
  {
    NRF_LOG_INFO("test");
    nrf_delay_ms(500);
  
  }

}

It still didn't work, after like a day trying and trying found out that this is working:

/**@brief Function for handling the idle state (main loop).
 *
 * @details If there is no pending log operation, then sleep until next the next event occurs.
 */
static void idle_state_handle(void)
{
    if (NRF_LOG_PROCESS() == false)
    {
        nrf_pwr_mgmt_run();
    }
}

static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}

int main(void)
{
  log_init();
 

  NRF_LOG_INFO("Initalization done");

  // Enter main loop.
  for (;;)
  {
    NRF_LOG_INFO("test");
    nrf_delay_ms(500);
    idle_state_handle();
  }

}

Can somebody explain why the function idle_state_handle() is needed to get the log function to work ? Took me all day to find out.

Look, I don't mind some work to get things working, but like I said, I want to work on my appliction and not these kind of things, why aren't these things documentated ?

[Gatze]

Stripped it down a bit more, if I comment the if statement then it doesn't work and when I decomment the if statement it is working:

static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}

int main(void)
{
  log_init();
 

  NRF_LOG_INFO("Initalization done");

  // Enter main loop.
  for (;;)
  {
    NRF_LOG_INFO("test");
    //nrf_delay_ms(500);
    if (NRF_LOG_PROCESS() == false);
  }

}

[Gatze]

After searching on the specific function I can find these documentation:

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v14.0.0%2Fgroup__nrf__log__ctrl.html

Like I said, you can find a lot of information how to edit to sdk_config to get the logging working, but not that the functions NRF_LOG_FLUSH() or NRF_LOG_PROCESS() is needed to get the log working.

I thought it just works like printf, but apparently it collects all the logs and process it at once, is this correct ?

At leasted I'm bit 'cooled' down, it is what is. I'm busy with a diy BMS:

[Amanda Hsieh]

Hi, 

Sorry for the delay due to the weekend. 

Since Blinky Example doesn't implement with Logger backend interface, it cannot enable the NRF_LOG_BACKEND_RTT_ENABLED in the config_sdk.h to get it to work. You should refer to the  Logger module documentation to implement it, which also includes using NRF_LOG_FLUSH() and NRF_LOG_PROCESS(). 

Regards,
Amanda

[Gatze]

Very thank you, another question, how to enable the NRFX_LOG_INFO outputs ? I'm trying to setup the saadc

Already defined:

#define NRFX_SAADC_CONFIG_LOG_ENABLED 1
#define NRFX_SAADC_CONFIG_LOG_LEVEL 3

But still no logger output from nrfx_saadc.c

Thanks in advance.