hello everyone,I have problem about sd_power_system_off

[mijiale65]

The chip is nrf52832. The SDK version that I am using is nRF5_SDK_13.1.0_7ca7556,the example that i used is ble_app_uart. When i debug about low power,i encounter problems "sd_power_system_off" don't make the chip sleep,my code as follows: main.c :

// Enter main loop.
for (;;)
{
		  NRF_LOG_FLUSH();
		  for(uint32_t i = 0;i < 2000000;i++)
		  {
				__asm {						
					      NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP
								NOP		
							}
			}				
		  NRF_LOG_INFO("code is running!\r\n");
		  //power_manage();                  
}

when advertising is timeout,call function "sleep_mode_enter" static void sleep_mode_enter(void) { uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE); APP_ERROR_CHECK(err_code);

// Prepare wakeup buttons.
err_code = bsp_btn_ble_sleep_mode_prepare();
APP_ERROR_CHECK(err_code);

err_code = sd_power_system_off();

}

I can see when advertising is timeout segger RTTviewer continues outputing "code is running!",the nrf52832 CPU still running after sd_power_system_off was called. That is what I am confused. Thank you !

[endnode]

Do you have SD enabled? What is the err_code returned by sd_power_system_off call? Why are you using NOP instructions which block the MCU? It would be much better with some proper non-blocking architecture (unless that NOP loop has some significant function;)

[mijiale65]

Thank you for your answer,I don't have SD enabled,the err_code is 0x2006,that is "Power off should not return";I use NOP instructions just for testing if the code will be stopped when sd_power_system_off function is called,NOP instructions just uses to hold on several hundred millisecond to output debugging information that is "code is running!",I can use the debugging information to make sure the code is running .

[Sigurd]

Just call NRF_LOG_FLUSH() or NRF_LOG_FINAL_FLUSH() right before you enter system off mode. The function will block until all buffered entries are processed by the backend(UART OR Segger RTT).

Any reason why the SD is not enabled when you are using a BLE example(ble_app_uart) ?