Belkin F8E211 Guía de usuario descargar pdf (Pagina 42)

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

typedef struct usbd device instance {

uint8 path;

uint8 devno;

uint16 generation;

usbd

device ident t ident;

uint32 config;

uint32 iface;

uint32 alternate;

} usbd

device instance t;

Looping

Another way to attach is to loop and attach to all devices (in which

case you build the instance yourself). For example:

for (devno = 0; devno < 64; ++devno) {

memset(&instance, USBD

CONNECT WILDCARD, sizeof(usbd device instance t));

instance.path = 0, instance.devno = devno;

if (usbd

attach(connection, &instance, 0, &device) == EOK) {

......

}

The degree of “attachedness” depends on how you connected. If you

speciﬁed insertion/removal callback functions, then you’ll get

exclusive access to the device and can make I/O to it.

If you didn’t use callbacks and you attached as in the loop above, you

get shared access, so you can only read device conﬁguration.

Returns:

EOK Success.

ENODEV Speciﬁed device doesn’t exist. If in a loop, then there’s

nothing at that devno. If from a callback, then the

device has since been removed.

EBUSY A shared/exclusive conﬂict.

ENOMEM No memory for internal device structures.

30 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 42