Power Management Example Code with Scheduler

[Sushi_27]

Hello, 

I've a query.

I am trying to build and see output of  "Power Management Example".

C:\nrf_sdk52\DeviceDownload\nRF5_SDK_17.1.0_ddde560\nRF5_SDK_17.1.0_ddde560\examples\peripheral\pwr_mgmt (this one)

PuTTY output given below :

<info> app: Power Management example
<info> app_timer: RTC: initialized.
<info> pwr_mgmt: Init
<info> pwr_mgmt: CPU Usage: 0%
<info> pwr_mgmt: CPU Usage: 0%
<info> pwr_mgmt: CPU Usage: 0%
<info> pwr_mgmt: CPU Usage: 0%
<info> pwr_mgmt: CPU Usage: 0%
<info> pwr_mgmt: CPU Usage: 0%
<info> pwr_mgmt: Shutdown request 0
<info> pwr_mgmt: Shutdown started. Type 0
<info> pwr_mgmt: SysOff handler 0x000088ED => blocking
<info> pwr_mgmt: CPU Usage: 1%
<info> pwr_mgmt: CPU Usage: 0%

I don't know why it's giving "<info> pwr_mgmt: SysOff handler 0x000088ED => blocking".

Thing I want to implement -

1. Shutdown the system when it is not required and wake up whenever the interrupt or any event occur.

(I've tried nrf52 in idle state mode --> calling nrf_pwr_mgmt_run  in for(;;) loop ) but now I wanted to make system off and wakeup.

2. I have query that if it is shutdown and when it is wakeup so I've to init all the peripheral again or not. 

[Kenneth]

Hello,

Please read the documentation for usage:
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/pwr_mgmt_example.html

Wakeup from system OFF can only occur from pin wakeup (or NFC), wakeup from system OFF will always reset the chip.

In normal usage you can instead use the nrf_pwr_mgmt_run() to make the MCU sleep while waiting for an event, in this case MCU will wakeup from system ON idle, and there is no reset.

Kenneth

[Sushi_27]

Okay. 

1. I've read the documentation  https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/pwr_mgmt_example.html and build it.

I am not able to understand why SysOff handler is blocking (After the configured time of inactivity, the application will switch to System OFF state )

Putty output:

<info> pwr_mgmt: SysOff handler 0x000088ED => blocking

2. As you said " Wakeup from system OFF can only occur from pin wakeup (or NFC) "  how should I do it.

As per the nrf52832 datasheet  "Analog or digital pin wakeup from System OFF" how should I configure particular pin to wakeup from System OFF.