USB Remote Wakeup not waking up host

RE: USB Remote Wakeup not waking up host

Håkon Alseth — Wed, 21 May 2025 13:27:57 GMT

Hi,

Q1: Have you tried multiple PCs/USB cables?

Q2: What version of the nRF52840-DK do you have?

Kind regards,

Håkon

RE: USB Remote Wakeup not waking up host

AGeegee — Wed, 21 May 2025 13:24:40 GMT

I do notice that the Remote Wakeup DOES work some of the time.

It is when the logs show only:

usb_hid: Device suspended

There after, subsequent Host Sleeps will always work and not result in the Suspend/Disconnect/Connect flow below.

When it does NOT work, it shows multiple

usb_hid: Device suspended
usb_hid: Device disconnected
usb_hid: Device connected
usb_hid: Device suspended
usb_hid: Device disconnected
usb_hid: Device connected
usb_hid: Device suspended

Any guidance on this?

Regards

RE: USB Remote Wakeup not waking up host

AGeegee — Wed, 21 May 2025 13:07:13 GMT

Yes it is a Windows PC. I checked under the Device Manager, the "Allow this device to wake the computer" is selected.

Also, just before setting the computer to "Sleep", the usb_device.c has the RemoteWakeup Feature set. As per the:

learn.microsoft.com/.../remote-wakeup-of-usb-devices

 case USB_SREQ_SET_FEATURE:
 LOG_DBG("Set Feature request");
 if (IS_ENABLED(CONFIG_USB_DEVICE_REMOTE_WAKEUP)) {
 if (setup->wValue == USB_SFS_REMOTE_WAKEUP) {
 usb_dev.remote_wakeup = true;
 return true;
 }
 }
 break;

RE: USB Remote Wakeup not waking up host

Håkon Alseth — Wed, 21 May 2025 12:52:03 GMT

Hi,

Is this a windows PC?

If yes, it is very important to know the restrictions when developing with USB on Windows. One being that Windows will always cache your USB descriptor initially, and not refresh it unless you change VID/PID of your device or delete the cached entries.

If you change the descriptor, the easiest option is to change/append PID for development purposes.

The OS might not allow a device to wake up the PC. You will need to manually enable or check the state of this feature. https://learn.microsoft.com/en-us/windows-hardware/drivers/usbcon/remote-wakeup-of-usb-devices

This function indicates that the device is allowed, but just to check all the corners, it would be great to see if there is anything in the device settings on the PC side that might block it.

[quote user=""]nrf_usbd_common_wakeup_req , which results in a 'ev_usbevent_handler' call to the USBD_EVENTCAUSE_USBWUALLOWED_Msk section.[/quote]

Kind regards,

Håkon