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usbd_status()

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.

Classification:

QNX Neutrino, QNX 4

See also:

usbd_descriptor(), usbd_feature(), usbd_io(), usbd_setup_bulk(), usbd_setup_control(), usbd_setup_interrupt(), usbd_setup_isochronous(), usbd_setup_vendor()