from usbd_customhid.c:199
static uint8_t USBD_CUSTOM_HID_Desc[USB_CUSTOM_HID_DESC_SIZ] __ALIGN_END =
{
0x09,
CUSTOM_HID_DESCRIPTOR_TYPE,
0x11,
0x01,
0x00,
0x01,
0x22,
LOBYTE(USBD_CUSTOM_HID_REPORT_DESC_SIZE),
HIBYTE(USBD_CUSTOM_HID_REPORT_DESC_SIZE),
};