enter into low power mode

[Tushar_V]

Hi All,

i am using nrf52840 in nrf_Connect_sdk

is there any way where i can enter low power mode without sleep functions

Regards

Tushar

[Susheel Nuguru]

Can you be a bit more specific on what do you mean by entering low power modes without sleep functions?

There is tickless idle feature in Zephyr that will make your application go to sleep automatically in idle states (that is when no other thread is runnable.

[Tushar_V]

Hi Susheel Nuguru,

i want the current rating to be down when i enter into low power mode

is there any way i can do it or i should disable peripherals

Regards

Tushar

[Susheel Nuguru]

If you are using the RTOS drivers, then they should be power aware when the app is not using the peripheral. So your application specifically do not need to disable the peripherals just to go into low power mode. 

Please check if this post gives you better understanding on how this works.

[Tushar_V]

Hi Susheel Nuguru,

i saw the link which you've

how can i put device into system_off mode and system_on mode in nrf_connect_sdk

Regards

tushar

[Tushar_V]

entering system off and system on mode with the help of timer this is what i want to implement

[Susheel Nuguru]

There is a tutorial  for making the chip go to system_off sleep and wakeup configuration. Even though the tutorial is made for nRF53, the configuration is still valid for nRF52840 aswell.

The most important configuration is for you to enable the power manager and the PM will automatically take control of the sleep states of your chip.

CONFIG_PM=y
CONFIG_PM_DEVICE=y

If you want to manually control when and how long your chip should go to sleep, then look at the example in nrf\samples\nfc\system_off\src\main.c::system_off and you can get some idea on how to make this work.

[Tushar_V]

Hi,

i went through the tutorial i have a doubt

This api - pm_power_state_force((struct pm_state_info){PM_STATE_SOFT_OFF, 0, 0});  goes to force sleep

how do i wake up 

there is no wakeup configuration in code.

Regards

Tushar

[Susheel Nuguru]

Sorry for the late response, I was away due to covid.

There is an system off example in the NCS SDK samples  You can find it in 
ncs\v1.8.0\zephyr\samples\boards\nrf\system_off\ example on how to configure a gpio sense mechanism to wakeup the system from this sleep mode.