usb echo example doesn't work with windows

[wackydoo]

I can upload the usb_echo example. It works when connected to linux computers, but the usb device is not recognized in windows.

Connecting to linux produces messages about issues with the USB config descriptor, which are corrected.

[24017.310623] usb 1-1.5: new high-speed USB device number 7 using ehci-pci
[24017.389225] usb 1-1.5: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 255, changing to 11
[24017.389238] usb 1-1.5: config 1 interface 1 altsetting 0 bulk endpoint 0x82 has invalid maxpacket 64
[24017.389243] usb 1-1.5: config 1 interface 1 altsetting 0 bulk endpoint 0x1 has invalid maxpacket 64
[24017.389718] usb 1-1.5: New USB device found, idVendor=1234, idProduct=abcd, bcdDevice= 0.10
[24017.389724] usb 1-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[24017.389728] usb 1-1.5: Product: usb-echo
[24017.389731] usb 1-1.5: Manufacturer: example
[24017.389734] usb 1-1.5: SerialNumber: 0123456789ABCDEF

When connecting with windows we get a popup message "USB Device not recognized".

Windows has stopped this device because it has reported problems. (Code 43)

The USB device returned an invalid USB configuration descriptor.

How can we modify the example to make the USB descriptor correct so that we see the USB CDC device in windows?

[gdobato]

Hello @wackydoo ,

Thanks for reporting the issue.
Issue is also reproducible on my end, i need to look into it.

[gdobato]

Hello @wackydoo ,

1484c9b should fix the issue . Could you pls check it on your side ?
Thanks :)
BR,

[wackydoo]

Works for me now in Windows and Linux. Thanks for the great examples - ready to go with the portenta.