CDA CD 60 Especificações descarregar pdf (Página 28)

PCI CD and PCI CDa

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

Template: edt.dot

Page 28

edt_disable_ring_buffers

Description

Disables the EDT device ring buffers. Pending DMA is cancelled and all buffers are released.

Syntax

#include "edtinc.h"

int edt_disable_ring_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_ring_buffer_overrun

Description

Returns true (1) when DMA has wrapped around the ring buffer and overwritten the buffer which the

application is about to access. Returns false (0) otherwise.

Syntax

#include "edtinc.h"

int edt_ring_buffer_overrun(EdtDev *edt_p);

Arguments

edt_p

device handle returned from edt_open or edt_open_channel.

Return

1 (true) when overrun has occurred, corrupting the current buffer, 0 (false) otherwise.

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

edt_reset_ring_buffers

Description

Stops any DMA currently in progress, then resets the ring buffer to start the next DMA at bufnum.

Syntax

#include "edtinc.h"

int edt_reset_ring_buffers(EdtDev *edt_p, int bufnum) ;

Arguments

edt_p

device handle returned from edt_open or edt_open_channel.

bufnum

The index of the ring buffer at which to start the next DMA. A number larger

than the number of buffers set up sets the current done count to the number

suppliedmodulo the number of buffers.

Return

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

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