usbd_interface_descriptor()

Get the interface descriptor for a specific interface setting

Synopsis:

#include <sys/usbdi.h>

usbd_interface_descriptor_t 
   *usbd_interface_descriptor(
       struct usbd_device *device,                          
       uint8_t cfg,                                          
       uint8_t ifc,                                          
       uint8_t alt,                                          
       struct usbd_desc_node **node );

Arguments:

device: An opaque handle used to identify the USB device.
cfg: The device's configuration identifier (bConfigurationValue).
ifc: Interface identifier (bInterfaceNumber).
alt: Alternate identifier (bAlternateSetting).
node: Indicates the descriptor's location for rooting future requests (e.g. endpoints of this interface).

Library:

libusbdi

Description:

The usbd_interface_descriptor() function lets you obtain the interface descriptor for a specific interface setting.

The usbd_interface_descriptor_t structure looks like this:

typedef struct usbd_interface_descriptor {
    uint8_t                  bLength;
    uint8_t                  bDescriptorType;
    uint8_t                  bInterfaceNumber;
    uint8_t                  bAlternateSetting;
    uint8_t                  bNumEndpoints;
    uint8_t                  bInterfaceClass;
    uint8_t                  bInterfaceSubClass;
    uint8_t                  bInterfaceProtocol;
    uint8_t                  iInterface;
} usbd_interface_descriptor_t;

Returns:

A pointer to usbd_interface_descriptor_t on success, or NULL on error.

Classification:

QNX Neutrino, QNX 4

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	No
Thread	Yes