>> See >> https://github.com/hathach/tinyusb/blob/master/examples/device/cdc_msc/src/usb_descriptors.c >> for an example of such a device. It has one mass storage device and one CDC. >> Changing the device class to 0x00 breaks support on Linux and macOS (I >> didn't try Windows). > > The question is -- does the aforementioned device conform to the USB-IF > specification ? I think it does not, but luckily it could be fixed in > software on the tinyusb side.
I'm not familiar enough with the available USB specs to say what is "right" but I think the problem is that "fixing" it by changing the device class breaks support on major operating systems.
