Belkin F8E211 Guia do Utilizador descarregar pdf (Página 62)

usbd

hcd

ext

info(), usbd

hcd

Get information on the USB host controller and DDK library

Synopsis:

#include <sys/usbdi.h>

int usbd_hcd_ext_info( struct usbd_connection *connection,

_uint32 cindex,

usbd_hcd_info_t *info );

int usbd_hcd_info( struct usbd_connection *connection,

usbd_hcd_info_t *info );

Arguments:

connection The handle for the connection to the USB stack, obtained by calling

usbd

connect().

cindex (usbd

hcd

ext

info() only) The index of the host controller.

info A pointer to a

usbd_hcd_info_t data structure that this function ﬁlls

in.

Library:

libusbdi

Description:

You can use the usbd

hcd

ext

info() or usbd

hcd

info() function to obtain

information from the USB host controller and DDK library.

If your system has more than one USB chip, you can call usbd

hcd

ext

info() to get

information about a speciﬁc one. The usbd

hcd

info() function gets information

about the ﬁrst USB chip; calling it is the same as calling usbd

hcd

ext

info() with a

cindex argument of 0.

The

usbd_hcd_info_t structure is deﬁned as follows:

typedef struct usbd_hcd_info {

_uint16 vusb;

_uint16 vusbd;

char controller[8];

_uint32 capabilities;

_uint8 ndev;

_uint8 cindex;

_uint16 vhcd;

_uint32 max

io;

_uint8 reserved[12];

} usbd_hcd_info_t;

It contains at least the following:

vusb The version number of the USB stack.

48 Chapter 4 • USB Library Reference September 10, 2007

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