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How to get low current consumption nrf52840

user109511

HI

I am using this sequence functions in  my main loop for low current consumption

__SEV();  __WFE(); __WFE(); 

normally I have 13mA  in my application  when I am using those functions my current is 7.8 mA

but the velocity process get down in my main loop , using 

__SEV();  __WFE(); __WFE(); 

 for (;;)//main loop
    {
			 
          __SEV();  __WFE(); __WFE(); 
			
			caida_init();
			idle_state_handle();
			turnOnLed();
    }
  

how can I to fix that?, 

or what can I use to replace it?

is the RTOS a possible solution?

thanks and reagrds

  • 0 in reply to user73165

    Hello

    yes, sure 

    when I comment uart_init in my application, don't works , but dont shows a specific error

     sdk_config is disabled uarte, and i dont have a problem abaut this

    but if is diabled this app_uart_enable

    shows this

    linking...
.\_build\nrf52840_xxaa.axf: Error: L6218E: Undefined symbol app_uart_get (referred from main.o).
.\_build\nrf52840_xxaa.axf: Error: L6218E: Undefined symbol app_uart_put (referred from main.o).
Not enough information to list image symbols.
Not enough information to list load addresses in the image map.
Finished: 2 information, 0 warning and 2 error messages.
".\_build\nrf52840_xxaa.axf" - 2 Error(s), 6 Warning(s).
Target not created.
Build Time Elapsed:  00:00:52

    i comented all about uart_init


    .\_build\nrf52840_xxaa.axf: Error: L6218E: Undefined symbol app_uart_get (referred from retarget.o).
.\_build\nrf52840_xxaa.axf: Error: L6218E: Undefined symbol app_uart_put (referred from retarget.o).
Not enough information to list image symbols.
Not enough information to list load addresses in the image map.
Finished: 2 information, 0 warning and 2 error messages.
".\_build\nrf52840_xxaa.axf" - 2 Error(s), 3 Warning(s).
Target not created.
Build Time Elapsed:  00:00:03

    i need to send and receive data over NUS, thats why  im using ble_uart example , but dont use the serial port tx/rx 

    im using this for to send data nrf52 to appNordic

    memset(printf_buffer, 0x00, sizeof(printf_buffer));
    snprintf(printf_buffer, 10, "E1");
    length = strlen(printf_buffer);
    uint32_t err_code = ble_nus_data_send(&m_nus, (uint8_t *)printf_buffer, &length, m_conn_handle);

    i comented 

    uart_init

    uart_event_handle

    thanks and regards

  • +1 in reply to user109511

    Hi,

    It seems like snprintf() is dependent on retarget.c which overwrites the stido library such as fput and fcget to use UART commands such as app_uart_get() and app_uart_put(). Which means that if you want to disable UART to save current consumption then you would also have to omit the usage of snprintf().

    regards

    Jared 

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