Get specific device status
Synopsis:
#include <sys/usbdi.h>
int usbd_status( struct usbd_device *device,
uint16_t rtype,
uint16_t index,
void *addr,
uint32_t len )
Arguments:
- 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.
Description:
You use the usbd_status() function to get
specific device status.
Returns:
- EOK
- Success.
- EMSGSIZE
- Buffer too small for descriptor.
- ENOMEM
- No memory for URB.
- ENODEV
- Device was removed.
Classification:
QNX Neutrino, QNX 4
Safety: |
|
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |