Belkin F8E211 Guía de usuario descargar pdf (Pagina 104)

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

Get speciﬁc device status

Synopsis:

#include <sys/usbdi.h>

int usbd

status( struct usbd device *device,

uint16 rtype, uint16 index,

void *addr,

uint32 len )

Description:

You use the usbd status() function to get speciﬁc device status.

device An opaque handle used to identify the USB device.

rtype Type of request (e.g.

USB RECIPIENT DEVICE,

USB RECIPIENT INTERFACE,

USB RECIPIENT ENDPOINT, USB RECIPIENT OTHER,

USB TYPE STANDARD, USB TYPE CLASS,

USB TYPE VENDOR).

index This varies, depending on the request. It’s used for passing

a parameter to the device.

addr Address for start of transfer — you must use the buffer

allocated by usbd

alloc().

len The length (in bytes) of the data transfer.

Returns:

EOK Success.

EMSGSIZE Buffer too small for descriptor.

ENOMEM No memory for URB.

ENODEV Device was removed.

92 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 104