CDA CD 60 Spezifikationen PDF herunterladen (Seite 30)

PCI CD and PCI CDa

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

Template: edt.dot

Page 30

Return

void

See Also

edt_startdma_reg(), edt_reg_write(), edt_reg_read()

edt_enddma_action

Description

Specifies when to perform the action at the end of a dma transfer as specified by edt_enddma_reg(). A

common use of this is to write to a register which signals an external device that dma is complete, or to

change the state of a signal which will be changed at the start of dma, so the external device can look

for an edge. The default is no end of dma action. Most applications can set the output signal, if needed,

from the application with edt_reg_write(). This routine is only needed if the action must happen within

microseconds of the end of dma.

Syntax

void edt_enddma_action(EdtDev *edt_p, uint_t val);

Arguments

edt_p

device struct returned from edt_open

val

One of EDT_ACT_NEVER, EDT_ACT_ONCE, or EDT_ACT_ALWAYS

Example

u_int fnct_value=0x1;

edt_enddma_action(edt_p, EDT_ACT_ALWAYS);

edt_enddma_reg(edt_p, PCD_FUNCT, fnct_value);

Return

void

See Also

edt_startdma_action(), edt_startdma_reg(), edt_reg_write(), edt_reg_read()

edt_startdma_reg

Description

Sets the register and value to use at the start of dma, as set by edt_startdma_action().

Syntax

void edt_startdma_reg(EdtDev *edt_p, uint_t desc, uint_t val);

Arguments

edt_p

device struct returned from edt_open

desc

val

value to write

Example

edt_startdma_action(edt_p, EDT_ACT_ALWAYS);

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