mcuee

I see. Will leave this issue open for now.

FYI libusbK-3.1.0.0 has been released with the added support of WinUSB isochronous transfer along with exisiting support of libusbk. https://github.com/mcuee/libusbk/releases LIBUSBK RELEASE NOTES V3.1.0.0 (07/19/2021) - Added isochronous support for...

libusbk is Windows only and the performance of WinUSB isoc transfer is very good (libusbk is slightly better based on my own testing). Travis has published his own testing reqults...

Yes WinUSB performance drops when the system is under load, based on my testing. Ref: https://community.osr.com/discussion/293001/benchmarking-winusb-libusbk-and-cypress-cyusb-driver For the IsoSrcSink FW, my system will handle isoc endpoint with burst of 8...

Need more reviews on this pull-request. It may not be able to sort out the issues completely though. But if it helps and not causing other problems, maybe it is...

@tormodvolden There are two parts of this commit. "Fixed missing CHECK_WINUSBX_AVAILABLE removed in 9c28ad2" seems to be a simple one. Do you think it is worth merging?

I am encounter issues with SuperSpeed transfer with WinUSB, libusbk seems to perform better. I am not so sure if this is address in this pull request or not. https://github.com/pyusb/pyusb/issues/380#issuecomment-1082556530...

Debug log for libusbk. ``` 2022-03-30 10:41:22,912 DEBUG:usb.backend.libusb1:_LibUSB.__init__() libusb: info [winusbx_init] WinUSB DLL available (with isoch support) libusb: error [load_usbdk_helper_dll] Failed to load UsbDkHelper.dll: [126] The specified module could not...

Hopefully more reviewers can look at the remaining commit.

I have set #1163 to be a duplicate of this one and indeed Pull request #1127 helps. * #1163 * #1127