USB_InterfaceDescriptor_TypeDef Struct Reference
USB Interface Descriptor.
#include <em_usb.h>
Data Fields |
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| uint8_t | bLength |
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Size of this descriptor in bytes.
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| uint8_t | bDescriptorType |
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Constant INTERFACE Descriptor Type.
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| uint8_t | bInterfaceNumber |
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Number of this interface.
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| uint8_t | bAlternateSetting |
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Value used to select this alternate setting for the interface identified in the prior field.
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| uint8_t | bNumEndpoints |
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Number of endpoints used by this interface (excluding endpoint zero).
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| uint8_t | bInterfaceClass |
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Class code (assigned by the USB-IF).
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| uint8_t | bInterfaceSubClass |
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Subclass code (assigned by the USB-IF).
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| uint8_t | bInterfaceProtocol |
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Protocol code (assigned by the USB).
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| uint8_t | iInterface |
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Index of string descriptor describing this interface.
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USB Interface Descriptor.
Field Documentation
◆ bLength
| uint8_t USB_InterfaceDescriptor_TypeDef::bLength |
Size of this descriptor in bytes.
◆ bDescriptorType
| uint8_t USB_InterfaceDescriptor_TypeDef::bDescriptorType |
Constant INTERFACE Descriptor Type.
◆ bInterfaceNumber
| uint8_t USB_InterfaceDescriptor_TypeDef::bInterfaceNumber |
Number of this interface.
Zero-based value identifying the index in the array of concurrent interfaces supported by this configuration.
◆ bAlternateSetting
| uint8_t USB_InterfaceDescriptor_TypeDef::bAlternateSetting |
Value used to select this alternate setting for the interface identified in the prior field.
◆ bNumEndpoints
| uint8_t USB_InterfaceDescriptor_TypeDef::bNumEndpoints |
Number of endpoints used by this interface (excluding endpoint zero).
If this value is zero, this interface only uses the Default Control Pipe.
◆ bInterfaceClass
| uint8_t USB_InterfaceDescriptor_TypeDef::bInterfaceClass |
Class code (assigned by the USB-IF).
A value of zero is reserved for future standardization. If this field is set to FFH, the interface class is vendor-specific. All other values are reserved for assignment by the USB-IF.
◆ bInterfaceSubClass
| uint8_t USB_InterfaceDescriptor_TypeDef::bInterfaceSubClass |
Subclass code (assigned by the USB-IF).
These codes are qualified by the value of the bInterfaceClass field. If the bInterfaceClass field is reset to zero, this field must also be reset to zero. If the bInterfaceClass field is not set to FFH, all values are reserved forassignment by the USB-IF.
◆ bInterfaceProtocol
| uint8_t USB_InterfaceDescriptor_TypeDef::bInterfaceProtocol |
Protocol code (assigned by the USB).
These codes are qualified by the value of the bInterfaceClass and the bInterfaceSubClass fields. If an interface supports class-specific requests, this code identifies the protocols that the device uses as defined by the specification of the device class. If this field is reset to zero, the device does not use a class-specific protocol on this interface. If this field is set to FFH, the device uses a vendor-specific protocol for this interface
◆ iInterface
| uint8_t USB_InterfaceDescriptor_TypeDef::iInterface |
Index of string descriptor describing this interface.