CDA CD 60 Especificaciones descargar pdf (Pagina 21)

PCI CD and PCI CDa

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

Template: edt.dot

Page 21

Arguments

edt_p

device handle returned from edt_open or edt_open_channel

bufnum

Number of buffers to release to the driver for transfer. An argument of 0

puts the driver in free

running mode, and transfers run continuously

until

edt_stop_buffers() is called.

Return

0 on success; –1 on error. If an error occurs, call edt_perror() to get the system error message.

edt_stop_buffers

Description

Stops DMA transfer after the current buffer has completed. Ring buffer mode remains active, and

transfers will be continued by calling edt_start_buffers().

Syntax

#include "edtinc.h"

int edt_stop_buffers(EdtDev *edt_p);

Arguments

edt_p

device handle returned from edt_open or edt_open_channel

Return

0 on success; –1 on error. If an error occurs, call edt_perror() to get the system error message.

edt_check_for_buffers

Description

Checks whether the specified number of buffers have completed without blocking.

Syntax

#include "edtinc.h"

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

Arguments

edt_p

device handle returned from edt_open or edt_open_channel.

count

number of buffers. Must be 1 or greater. Four is recommended.

Return

Returns the address of the ring buffer corresponding to count if it has completed DMA, or NULL if

count buffers are not yet complete.

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.

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