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usbd

device

Get the device descriptor for a speciﬁc device

Synopsis:

#include <sys/usbdi.h>

usbd_device_descriptor_t

*usbd_device_descriptor(

struct usbd_device *device,

struct usbd_desc_node **node );

Arguments:

device A handle obtained by calling usbd

attach().

node The address of a pointer to a

usbd_device_descriptor_t structure

where the function stores the device descriptor.

Library:

libusbdi

Description:

The usbd

device

descriptor() function lets you obtain the device descriptor for a

speciﬁc device.

The node parameter tells you where a descriptor was found to root future requests

from (e.g. conﬁgurations of the device).

The

usbd_device_descriptor_t structure looks like this:

typedef struct usbd_device_descriptor {

_uint8 bLength;

_uint8 bDescriptorType;

_uint16 bcdUSB;

_uint8 bDeviceClass;

_uint8 bDeviceSubClass;

_uint8 bDeviceProtocol;

_uint8 bMaxPacketSize0;

_uint16 idVendor;

_uint16 idProduct;

_uint16 bcdDevice;

_uint8 iManufacturer;

_uint8 iProduct;

_uint8 iSerialNumber;

_uint8 bNumConfigurations;

} usbd_device_descriptor_t;

Returns:

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

36 Chapter 4 • USB Library Reference September 10, 2007

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