Espressif ESP32-S2 Programming Manual page 510

Chapter 2. API Reference
USB_TRANSFER_TYPE_INTR
enum usb_transfer_status_t
The status of a particular transfer.
Values:
USB_TRANSFER_STATUS_COMPLETED
The transfer was successful (but may be short)
USB_TRANSFER_STATUS_ERROR
The transfer failed because due to excessive errors (e.g. no response or CRC error)
USB_TRANSFER_STATUS_TIMED_OUT
The transfer failed due to a time out
USB_TRANSFER_STATUS_CANCELED
The transfer was canceled
USB_TRANSFER_STATUS_STALL
The transfer was stalled
USB_TRANSFER_STATUS_OVERFLOW
The transfer as more data was sent than was requested
USB_TRANSFER_STATUS_SKIPPED
ISOC packets only. The packet was skipped due to system latency or bus overload
USB_TRANSFER_STATUS_NO_DEVICE
The transfer failed because the target device is gone
Header File
• components/usb/include/usb/usb_types_ch9.h
Unions
union usb_setup_packet_t
#include <usb_types_ch9.h> Structure representing a USB control transfer setup packet.
See Table 9-2 of USB2.0 specification for more details
Public Members
uint8_t bmRequestType
Characteristics of request
uint8_t bRequest
Specific request
uint16_t wValue
Word-sized field that varies according to request
uint16_t wIndex
Word-sized field that varies according to request; typically used to pass an index or offset
uint16_t wLength
Number of bytes to transfer if there is a data stage
struct usb_setup_packet_t::[anonymous] [anonymous]
uint8_t val[USB_SETUP_PACKET_SIZE]
union usb_standard_desc_t
#include <usb_types_ch9.h> USB standard descriptor.
All USB standard descriptors start with these two bytes. Use this type when traversing over configuration
descriptors
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