CDA CD 60 Specifikace stáhnout pdf (Strana 25)

PCI CD and PCI CDa

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

Template: edt.dot

Page 25

edt_set_buffer(edt_p, 0);

Return

0 on success, -1 on failure.

See Also

edt_stop_buffers(), edt_done_count(), edt_get_todo()

edt_set_buffer_size

Description

Used to change the size or direction of one of the ring buffers. Almost never used. Mixing directions

requires detailed knowledge of the interface since pending preloaded DMA transfers need to be

coordinated with the interface fifo direction. For example, a dma write will complete when the data is

in the output fifo, but the dma read should not be started until the data is out to the external device.

Most applications requiring fast mixed reads/writes have worked out more cleanly using seperate,

simultaneous, read and write dma transfers using different dma channels.

Arguments

edt_p

device handle returned from edt_open or edt_open_channel

which_buf

index of ring buffer to change

size

size to change it to

write_flag

direction

Syntax

int edt_set_buffer_size(EdtDev *edt_p, unsigned int which_buf,

unsigned int size, unsigned int write_flag)

Example

u_int bufnum=3;

u_int bsize=1024;

u_int dirflag=EDT_WRITE;

int ret;

ret=edt_set_buffer_size(edt_p, bufnum, bsize, dirflag);

Return

0 on success, -1 on failure.

See Also

edt_open_channel(), redpcd8.c, rd16.c, rdssdio.c, wrssdio.c

edt_last_buffer

Description

Waits for the last buffer that has been transferred. This is useful if the application cannot keep up with

buffer transfer. If this routine is called for a second time before another buffer has been transferred, it

will block waiting for the next transfer to complete.

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