The right way to enter to the system off mode

[Michael]

Hello,

In my application I'm putting the NRF52832 device to the system off by calling the sd_power_system_off() function.

When it occurs at the start of the program - the device enters to the system off (about 4mA man!!!), but when I try to put the device to the deep sleep at the other places (much more later, after advertising, some work and etc.) the function sd_power_system_off() returns NRF_ERROR_SOC_POWER_OFF_SHOULD_NOT_RETURN and system is not entering to the deep sleep.

I have two questions:

1. What the RIGHT way to put the system into the deep sleep (system off)??? (urgent)

2. 4mA at the deep sleep it's very high value - what I'm doing wrong?

Thanks a lot!

UPDATE! UPDATE!

I found the next words in the documentation:

Before entering System OFF mode, the user must make sure that all on-going EasyDMA transactions have been completed. This is usually accomplished by making sure that the EasyDMA enabled peripheral is not active when entering System OFF.

How can I check that all transactions are finished? How can I disable the EasyDMA at all, before putting the system into the deep sleep?

UPDATE! UPDATE!

I'm entering to the System Off mode by calling sd_power_system_off(), without checking the return code and after that I place the infinite loop while(1);

Is it correct way?

[rraa]

When sd_power_system_off() your board monitoring app? Where adding sd_power_system_off() function in your code?

[Michael]

Hello! I have more than 5000 rows of the code. When the main system is not working I'm putting the board to the system off. I think that I need to close another processes before the deep sleep, but not sure. What flags can be checked? What should be done? It's so not clear in the documentation... :(

[rraa]

I need only main.c

[Michael]

It's peace of the code:

while(nrf_gpio_pin_read(ON_SWITCH_N_PIN_INPUT) != switchOnDefaultState)
{
    //be in while until button is not released
    nrf_delay_ms(50);
}

//Wait while the main system will shutdown
nrf_delay_ms(6000);

//Power off the main system
SecureOnPinOff();
NRF_LOG_INFO("got close app from the main system, I'm going to sleep");
NRF_LOG_PROCESS();

NRF_LOG_INFO("-- Going to the DeepSleep");
NRF_LOG_PROCESS();

nrf_delay_ms(1000);

uint32_t res = sd_power_system_off();
NRF_LOG_INFO("I'm not sleeping!1");
NRF_LOG_PROCESS();
res = sd_power_system_off();
NRF_LOG_INFO("I'm not sleeping!2");
NRF_LOG_PROCESS();
res = sd_power_system_off();
NRF_LOG_INFO("I'm not sleeping!3");
NRF_LOG_PROCESS();

[rraa]

Did you see NRF_LOG_INFO("I'm not sleeping?")?