Espressif ESP32-S2 Programming Manual page 512

Chapter 2. API Reference
See Table 9-10 of USB2.0 specification for more details
Note The full USB configuration includes all the interface and endpoint descriptors of that configuration.
Public Members
uint8_t bLength
Size of the descriptor in bytes
uint8_t bDescriptorType
CONFIGURATION Descriptor Type
uint16_t wTotalLength
Total length of data returned for this configuration
uint8_t bNumInterfaces
Number of interfaces supported by this configuration
uint8_t bConfigurationValue
Value to use as an argument to the SetConfiguration() request to select this configuration
uint8_t iConfiguration
Index of string descriptor describing this configuration
uint8_t bmAttributes
Configuration characteristics
uint8_t bMaxPower
Maximum power consumption of the USB device from the bus in this specific configuration when the
device is fully operational.
struct usb_config_desc_t::[anonymous] USB_DESC_ATTR
uint8_t val[USB_CONFIG_DESC_SIZE]
union usb_iad_desc_t
#include <usb_types_ch9.h> Structure representing a USB interface association descriptor.
Public Members
uint8_t bLength
Size of the descriptor in bytes
uint8_t bDescriptorType
INTERFACE ASSOCIATION Descriptor Type
uint8_t bFirstInterface
Interface number of the first interface that is associated with this function
uint8_t bInterfaceCount
Number of contiguous interfaces that are associated with this function
uint8_t bFunctionClass
Class code (assigned by USB-IF)
uint8_t bFunctionSubClass
Subclass code (assigned by USB-IF)
uint8_t bFunctionProtocol
Protocol code (assigned by USB-IF)
uint8_t iFunction
Index of string descriptor describing this function
struct usb_iad_desc_t::[anonymous] USB_DESC_ATTR
uint8_t val[USB_IAD_DESC_SIZE]
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