CDA CD 60 Dokumentacja Pobierz pdf (Strona 38)

PCI CD and PCI CDa

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

Template: edt.dot

Page 38

Example

int application_should_already_know_this;

application_should_already_know_this=edt_get_firstflush(edt_p);

Return

Yes

See Also

edt_set_firstflush

Description

Tells whether and when to flush the FIFOs before DMA transfer. By default, the FIFOs are not flushed.

However, certain applications may require flushing before a given DMA transfer, or before each

transfer.

Syntax

#include "edtinc.h"

int *edt_set_firstflush(EdtDev *edt_p, int flag) ;

Arguments

edt_p

device handle returned from edt_open or edt_open_channel.

flag

Tells whether and when to flush the FIFOs. Valid values are:

EDT_ACT_NEVER don’t flush before DMA transfer (default)

EDT_ACT_ONCE flush before the start of the next DMA transfer

EDT_ACT_ALWAYS flush before the start of every DMA transfer

Return

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

edt_flush_fifo

Description

Flushes the board’s input and output FIFOs, to allow new data transfers to start from a known state.

Syntax

#include "edtinc.h"

void edt_flush_fifo(EdtDev *edt_p);

Arguments

edt_p

device handle returned from edt_open or edt_open_channel

Return

No return value.

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CDA CD 60 Dokumentacja Strona 38