CDA CD 60 Especificações descarregar pdf (Página 18)

PCI CD and PCI CDa

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

Template: edt.dot

Page 18

Arguments

devname

a string with the name of the EDT Product board. For example, “edt”.

unit

specifies the device unit number

Return

A handle of type (EdtDev *), or NULL if error. (The structure(EdtDev *) is defined in libedt.h.) If an

error occurs, check the errno global variable for the error number. The device name for the EDT

Product is “edt”. Once opened, the device handle may be used to perform I/O using edt_read(),

edt_write(), edt_configure_ring_buffers(), and other input-output library calls.

edt_open_channel

Description

Opens a specific DMA channel on the specified EDT Product, when multiple channels are supported

by the Xilinx firmware, and sets up the device handle. Use edt_close() to close the channel.

Syntax

#include "edtinc.h"

EdtDev *edt_open_channel(char *devname, int unit, int channel) ;

Arguments

devname

a string with the name of the EDT Product board. For example, “edt”.

unit

specifies the device unit number

channel

specifies the DMA channel number counting from zero

Return

A handle of type (EdtDev *), or NULL if error. (The structure(EdtDev *) is defined in libedt.h.) If an

error occurs, check the errno global variable for the error number. The device name for the EDT

Product is “edt”. Once opened, the device handle may be used to perform I/O using edt_read(),

edt_write(), edt_configure_ring_buffers(), and other input-output library calls.

edt_close

Description

Shuts down all pending I/O operations, closes the device or channel and frees all driver resources

associated with the device handle.

Syntax

#include "edtinc.h"

int edt_close(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.

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