CDA CD 60 Especificaciones descargar pdf (Pagina 23)

PCI CD and PCI CDa

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

Template: edt.dot

Page 23

Syntax

#include "edtinc.h"

void *edt_wait_buffers(EdtDev *edt_p, int count);

Arguments

edt_p

device handle returned from edt_open or edt_open_channel

count

How many buffers to block for. Completed buffers are numbered relatively;

start each call with 1.

Return

Address of last completed buffer on success; NULL on error. If an error occurs, call edt_perror() to get

the system error message.

Note

If using timeouts, call edt_timeouts after edt_wait_for_buffers returns to see if the number of

timeouts has incremented. If it has incremented, call edt_get_timeout_count to get the

number of bytes transferred into the buffer. DMA does not automatically continue on to the

next buffer, so you need to call edt_start_buffers to move on to the next buffer in the ring.

Note

If the ring buffer is in free-running mode and the application cannot process data as fast as it

is acquired, DMA will wrap around and overwrite the referenced buffer. The application must

ensure that the data in the buffer is processed or copied out in time to prevent overrun.

edt_wait_for_next_buffer

Description

Waits for the next buffer that finishes DMA. Depending on how often this routine is called, buffers that

have already completed DMA might be skipped.

Syntax

#include "edtinc.h"

void *edt_wait_for_next_buffer(EdtDev *edt_p) ;

Arguments

edt_p

device handle returned from edt_open or edt_open_channel.

Return

Returns a pointer to the buffer, or NULL on failure. If an error occurs, call edt_perror() to get the

system error message.

edt_wait_buffers_timed

Description

Blocks until the specified number of buffers have completed with a pointer to the time the last buffer

finished.

Syntax

#include "edtinc.h"

void *edt_wait_buffers_timed (EdtDev *edt_p, int count, uint *timep);

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