CDA CD 60 Especificações descarregar pdf (Página 22)

PCI CD and PCI CDa

Document Number: 008-00965-06 EDT Public Revision: I December 2004

Template: edt.dot

Page 22

edt_done_count

Description

Returns the cumulative count of completed buffer transfers in ring buffer mode.

Syntax

#include "edtinc.h"

int edt_done_count(EdtDev *edt_p);

Arguments

edt_p

device handle returned from edt_open or edt_open_channel.

Return

The number of completed buffer transfers. Completed buffers are numbered consecutively starting with

0 when edt_configure_ring_buffers() is invoked. The index of the ring buffer most recently completed

by the driver equals the number returned modulo the number of ring buffers. –1 is returned if ring

buffer mode is not configured. If an error occurs, call edt_perror() to get the system error message.

edt_get_todo

Description

Gets the number of buffers that the driver has been told to acquire. This allows an application to know

the state of the ring buffers within an interrupt, timeout, or when cleaning up on close. It also allows the

application to know how close it is getting behind the acquisition. It is not normally needed.

Syntax

uint_t edt_get_todo(EdtDev *edt_p);

Arguments

edt_p

device handle returned from edt_open or edt_open_channel.

Example

int curdone;

int curtodo;

curdone=edt_done_count(pdv_p);

curtodo=edt_get_todo(pdv_p);

/* curtodo--curdone how close the dma is to catching with our

processing */

Return

Number of buffers started via edt_start_buffers.

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CDA CD 60 Especificações Página 22