Very long discover time connect with hfclk request

[Vlad Mokhnachov]

Hi!

I am using SDK15.3.0, PCA10056 and Windows10.

I am notice, that if it will be hfclk request before usb launching and WFE in main loop, time for discover usb device by system increase from less second to 5 second.(I mean time after reset, not first launch)

It can be reproduced with usbd_hid_generic example and NRF52840 DK board(in attachment modified example).

Also, it shouldn't use usb event queue.(APP_USBD_CONFIG_EVENT_QUEUE_ENABLE 0)

You can comment:

574: nrf_drv_clock_hfclk_request(NULL);

or:

621: __WFE();

usbd_hid_generic.zip

It will make fast connect.

[AndreasF]

Hi.

I'm struggelig with reproducing the issue.

Could you please explain how you do your test?

Best regards,

Andreas

[Vlad Mokhnachov]

1. Press reset on DK.

2. Hold user button on DK.

3. Check time between reset event and mouse move.

[AndreasF]

Hi.

Thanks for the information, I've managed to reproduce the issue.

I have to contact the development team and report this.

Best regards,

Andreas

[AndreasF]

Hi.

The ticket id reported to the developers is NRFFOETT-2347.

Best regards,

Andreas

[Vlad Mokhnachov]

Hi!

Thanks!

Where can I see info for this ticket id?

[AndreasF]

Hi.

It is an internal ticket, so you have to ask info about it here by submitting that ID.

I've talked a bit more with the development team, and the person responsible for USB related stuff is on vacation until Monday.

Best regards,

Andreas