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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 );

Description:

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

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.

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

See also:

usbd_args_lookup(), usbd_configuration_descriptor(), usbd_device_lookup(), usbd_device_extra(), usbd_device_descriptor(), usbd_hcd_info(), usbd_hub_descriptor(), usbd_interface_descriptor(), usbd_languages_descriptor(), usbd_parse_descriptors(), usbd_string(), usbd_urb_status()