PPK2 and hibernation

[MKJ]

We are using the PPK2 in a test rig to control the power supply and measure the current of an attached device. We recently discovered that the PPK2 did not behave properly if the PC is put into hibernation mode and then woken up.

I have been able to duplicate this issue using the Power Profile in the Nordic nRF Connect Desktop application. The sequence is:

1) Start the Power Profile and select the relevant PPK2 device

2) The PPK2 LED changes from Green to Red.

3) Switch on the power to the remote device.

4) Remote device operates as expected.

5) Put the PC into hibernation mode.

6) PPK2 LED stays Red as expected.

7) Awaken PC

8) Remote device continues to operate

9) Toggle power to device using PPK2 - nothing happens

10) PPK2 remains unresponsive unless you stop the Power Profile then open/close the serial port for the PPK2

I cannot tell what version of PPK2 firmware I am running but the log from the Power Profiler checks it and finds it OK.

There seems to be an issue with the PPK2 serial port after waking up - is there a fix available?

[Simonr]

Hi Martin

They've started looking into it but have not concluded their final thoughts on it. 

But, when the PC goes into hibernation mode, application won't be running at all, so it won't be possible for the Power Profiler app to collect data from the PPK2 in hibernation mode. We're looking into whether we can recover the Power Profiler app when the PC awakes from hibernation and let it resume capturing without having to close and open the serial port.

Best regards,

Simon

[MKJ]

I know that that app won't be running in Hibernation mode.

The problem is that once it is out of hibernation mode the interface is in a peculiar state unless you cycle the serial port. As I mentioned before other serial ports in the system (FTDI serial adapters) work correctly but the PPK does not.

[Simonr]

Understood. I'll let you know when I hear back from the devs on this, as I personally don't have any further thoughts or suggestions to why this is... Thank you for your patience!

Best regards,

Simon

[MKJ]

Simon

Any progress on this case?

[Simonr]

Nothing as of yet, but I have pinged the developers again asking for an update. Hopefully we'll have a progress report or update for you on Monday.

Best regards,

Simon