//  USB Device
static const struct usb_device_descriptor dev = {
    .bLength = USB_DT_DEVICE_SIZE,     //  Length of this descriptor.
    .bDescriptorType = USB_DT_DEVICE,  //  This is a Device Descriptor.
    .bcdUSB = 0x0210,  //  USB Version 2.1.  Need to handle special requests e.g. BOS.
    .bDeviceClass = USB_CLASS_MISCELLANEOUS,  //  Miscellaneous Class. For composite device, let host probe the interfaces.
    .bDeviceSubClass = 2,  //  Miscellaneous Common Class
    .bDeviceProtocol = 1,  //  Use Interface Association Descriptor
    .bMaxPacketSize0 = 64, //  USB packet size
    .idVendor = USB_VID,   //  Official USB Vendor ID
    .idProduct = USB_PID,  //  Official USB Product ID
    .bcdDevice = 0x0220,   //  Device Release number 2.2
    .iManufacturer = USB_STRINGS_MANUFACTURER,  //  Name of maufacturer
    .iProduct = USB_STRINGS_PRODUCT,            //  Name of product
    .iSerialNumber = USB_STRINGS_SERIAL_NUMBER, //  Serial number
    .bNumConfigurations = 1,  //  How many configurations we support
};