Device fails to enumerate using windows

[ryankurte]

hi folks,

running [email protected] on an STM32H7 with usbd-serial and usbd-hid and everything is working okay on linux, but when connected to windows enumeration is attempted four times then fails with the error:

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

The USB device returned an invalid USB configuration descriptor.

digging into device manager reports USB\CONFIGURATION_DESCRIPTOR_VALIDATION_FAILURE and somewhat interestingly doesn't seem to correctly parse out the VID:PID (though the device descriptor read appears okay).

here is the defmt log from the device: stm32-usb-log.txt and a pcap captured using a cynthion between the host and device: stm32-usb-pcap.zip

this looks very similar to a couple of prior issues, though PRs suggest these were resolved:

• USB device may fail initial enumeration on Windows #82
• Can't implement CDC with HID #102
• Devices may fail to enumerate on Windows (Part II) #128

i think the next step is to try isolating the hid and serial interfaces to make sure it's not specific to one of them, but i'd definitely appreciate any thoughts!

update: serial or hid each works by itself, but combining the two leads to failures...

[ryankurte]

looks like this was related to #102... resolved by increasing .max_packet_size_0(64), swapping to .composite_with_iads(), and making sure the hid interface is initialised and polled before the serial one (the other way around does not work for windows apparently).