Belkin F8E211 Guia do Utilizador descarregar pdf (Página 38)

usbd

Looping

Another way to attach is to loop and attach to all devices (in which case you build the

instance yourself). For example:

for (busno = 0; busno < 10; ++busno) {

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

memset(&instance, USBD_CONNECT_WILDCARD, sizeof(usbd_device_instance_t));

instance.path = busno, 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.

Classiﬁcation:

QNX Neutrino, QNX 4

Safety

Cancellation point Yes

Interrupt handler No

Signal handler No

Thread Yes

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Belkin F8E211 Guia do Utilizador Página 38