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usbd_endpoint_descriptor()

Get the endpoint descriptor for a specific endpoint setting

Synopsis:

#include <sys/usbdi.h>

usbd_endpoint_descriptor_t 
   *usbd_endpoint_descriptor( 
       struct usbd_device *device,                          
       _uint8 config,                                       
       _uint8 iface,                                        
       _uint8 alt,                                          
       _uint8 endpoint,                                     
       struct usbd_desc_node **node );

Arguments:

device: An opaque handle used to identify the USB device.
config: Configuration identifier (bConfigurationValue).
ifc: Interface identifier (bInterfaceNumber).
alt: Alternate identifier (bAlternateSetting).
endpoint: Endpoint identifier (bEndpointAddress).
node: Indicates the descriptor's location for rooting future requests.

Library:

libusbdi

Description:

The usbd_endpoint_descriptor() function lets you obtain the endpoint descriptor for a specific endpoint on a configuration/interface.

The endpoint_descriptor_t structure looks like this:

typedef struct usbd_endpoint_descriptor {
    _uint8                    bLength;
    _uint8                    bDescriptorType;
    _uint8                    bEndpointAddress;
    _uint8                    bmAttributes;
    _uint16                   wMaxPacketSize;
    _uint8                    bInterval;
} usbd_endpoint_descriptor_t;

Returns:

A pointer to usbd_endpoint_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