Belkin F8E211 Guía de usuario descargar pdf (Pagina 48)

usbd connect()  2006, QNX Software Systems GmbH & Co. KG.

ﬂags Currently none deﬁned. Pass 0.

argc and argv Command-line arguments to the device driver that

can be made available via usbd

args lookup() at

insertion/attach time.

evtbufsz Size of the event buffer used by the handler thread

to buffer events from the USB stack. For the

default size, pass 0.

ident Identiﬁes the devices you’re interested in receiving

insertion/removal callbacks for (a ﬁlter); ﬁelds can

be set to

USBD CONNECT WILDCARD or to an

explicit value.

funcs The insertion/removal callbacks.

connect

wait A value (in seconds) or USBD CONNECT WAIT.

typedef struct usbd device ident {

uint32 vendor;

uint32 device;

uint32 dclass;

uint32 subclass;

uint32 protocol;

} usbd

device ident t;

You would typically make the usbd device ident structure be a

ﬁlter for devices you support from this speciﬁc class driver.

typedef struct usbd funcs {

uint32 nentries;

void (*insertion)(struct usbd

connection *, usbd device instance t *instance);

void (*removal)(struct usbd

connection *, usbd device instance t *instance);

void (*event)(struct usbd

connection *, usbd device instance t *instance,

uint16 type);

} usbd

funcs t;

The callback functions are contained here.

insertion Called when a device that matches deﬁned ﬁlter is

detected.

removal Called when a device is removed.

36 Chapter 4 USB Library Reference November 2, 2006

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