Belkin F8E211 Guía de usuario descargar pdf (Pagina 36)

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

Allocate memory area to use for data transfers

Synopsis:

#include <sys/usbdi.h>

void *usbd

alloc( size t size );

Description:

The usbd alloc() function allocates a memory area that can then be

used for data transfers. You should use the memory area allocated by

this function, because it’s allocated efﬁciently and because its

physical address is quickly obtained via usbd

mphys().

The usbd setup *() functions require usbd alloc()’d data buffers.

☞

size Size (in bytes) of the area to be allocated.

To free the memory, use usbd

free().

Returns:

A pointer to the start of the allocated memory, or NULL if there’s not

enough memory.

Errors:

ENOMEM Insufﬁcient memory available.

Classiﬁcation:

QNX Neutrino, QNX 4

Safety

Cancellation point No

Interrupt handler No

continued.. .

24 Chapter 4 USB Library Reference November 2, 2006

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 113 114

Sin comentarios

Belkin F8E211 Guía de usuario Pagina 36