ble_app_uart example - how to get the lowest current comsumption NRF52832

Question

Hello, I'm working with an example of ble_app_uart with SofDev132. I have modified the code a bit but I still use the nrf_pwr_mgmt_run function. The power consumption is 2.18mA for disabled BLE broadcasting and I do not turn on broadcasting for power consumption tests (tested on hardware and nRF52 DevKit) I need to have RTC turned on so I can not use low-power system-off. How to minimize power consumption using nrf_pwr_mgmt_run function to get more or less 10uA of power consumption? (For low-power system-off the current consumption is 2.5uA so the hardware is ok).

int main(void)
{
 bool erase_bonds;

 // Initialize.
 uart_init();
 log_init();
 timers_init();
 buttons_leds_init(&erase_bonds);
 power_management_init();
 rtc2_init(0xFFF);//prescaler 12bit, max value 0xFFF
 rtc2_start();
 flash_init();
 ble_stack_init();
 gap_params_init();
 gatt_init();
 services_init();
 advertising_init();
 conn_params_init();


 // Start execution.
 NRF_LOG_INFO("Debug logging for UART over RTT started.");
 // Enter main loop.
 
 for (;;)
 {

 if(state==START_ADV))
 { 
 state= ADV_IS_RUNNING;
 advertising_start();
 }
 
 idle_state_handle();


 }
}

hmolesworth · Answer

Try adding this at the start of main: 
 // DC-DC power supply enable, saves about 100mA at 2.7 volts over using internal LDO regulator
 nrf_power_dcdcen_set(true); 
 Try closing the UART (before sleep) in particular; it can always be started again when needed while awake: 
 // Terminate UART transfers serial port - saved about 1mA
 app_uart_close();