More consumption with NRF_LOG

[navarrocantero]

Hi, I have a custom board that the actually consumption its 1,5mA with the NRF_LOG enabled.

I have a buzzer that I need to toogle and I need disable the NRF_LOG because if its enabled the buzzer wont work.

But the weird thing its with the NRF_LOG disabled the consumption its higger (2,5mA) and I have research and the 

"normal behavior" must be the contrary (NRF_LOG_DISABLED = low consumption, NRF_LOG_ENABLED = high consumption)

I have tested to disable uart to but nothing works. 

Can you help me please ? why its the consumption higger with the nrf_log enabled ??

Thanks! 

[Stian Røed Hafskjold]

Hello, how do you disable the NRF_LOG module?

If you get higher current with the logging module turned off, it's probably not related to the logging module itself. You say that the buzzer does not work with logging enabled. My guess is that the code is consuming less current with logging enabled simply because it does not work as expected.

[navarrocantero]

Hello ! 

I disabled the nrf_log module from the sdk_config file 

NRF_LOG_ENABLED 0

I thought that the buzzer dosn twork with the log enabled 
because the rx_pin

NRF_LOG_BACKEND_UART_TX_PIN 6

Exists a better way to disable the log ? 

THanks for you fast reply!

[Stian Røed Hafskjold]

Yes, it is the correct way of disabling the logger. Now we need to figure out why your code consumes 2.5mA. Can describe what you code does, and how you have connected external components etc.

[navarrocantero]

Yes sure, 

I have a bosch axis magneto/accelerometer/gyroscope connected by twi and a flash memory IC connected by spi. 

But the code its to to long to post it !!! But basically i get the raw data from the boschs IC  and i expose these data in a custom characteristic or/and I send it to the flash memory.  

But I want  knows for what reason would the consumption increase by the log enabled  its so so weird, I have tested to change the uart_tx pin but dosnt work neither 

I have the nfcs pins disabled and I use as GPIO too. 

And I thintk its all! 

[Stian Røed Hafskjold]

How does your main loop look like? Are you going into sleep state, i.e. do you have a __WFE() somewhere in the loop?

[navarrocantero]

this is my main loop : 

for (;;) {
        if (isConfigured) {
            if (oneShootBoolean) {
                err_code = app_timer_start(global_timer, UPDATE_1_MS, NULL);
                APP_ERROR_CHECK(err_code);
                oneShootBoolean = false;
            }
            idle_state_handle();
            if (isConnected) {
                toogle_modes(CONNECTED);
            } else {
                toogle_modes(DISCONNECTED);
            }
        }
    }
}

and in the idle_state_handle() y have added another function, here is :

static void idle_state_handle(void) {
    if (NRF_LOG_PROCESS() == false) {
        nrf_pwr_mgmt_run();
        sd_app_evt_wait();
    }
}
thanks !!

[Stian Røed Hafskjold]

Are you using the softdevice?

Can you try to just put __WFE(); in the idle_state_handle, like this:

static void idle_state_handle(void) {
    __WFE();
}

Also, can you try this one:

static void idle_state_handle(void) {
    nrf_pwr_mgmt_run();
}