Power management shutdown

[Gueston]

What exactly does the power management library? Does it handles all the ongoing processes and shut them down?

Because I did a test with for instance a flash write, and I saw that the there was a shutdown before the callback of the flash write was received, in other words it didnt write it to flash. So I was wondering what is it doing then, what does it differ from making a manual reset/shutdown?

[Simonr]

Hi

Please check out the Power management library page on the Infocenter for details. This library is used for handling idle mode and entering system OFF or DFU modes. You will need to prepare the device for sleep before calling I.E. the "sd_power_system_off()" function. You can see in our SDK example projects, that we usually have a function like sleep_mode_enter() or idle_state_handle() to prepare the device for sleep mode before actually going to sleep mode.

Best regards,

Simon

[Gueston]

I saw those examples. So if I understand correctly I need to prepare everything myself before sleepmode/reset? But what is the purpose of that library then, if I can call sd_power_system_off() directly and I also need to prepare before sleep?

In other words, in both situation I need to prepare for sleep, so what does the library function do more?

[Simonr]

Yes, you can use the sd_power_system_off() similarly as long as your application uses a SoftDevice. The NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF doesnt do anything more than putting the device in system OFF mode, but the power management library provides other features like the CPU usage traces, a standby timeout, a "stay in system OFF mode" etc.

Best regards,

Simon