IBDMA

Board-Level

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Note ibdma is deprecated. Use ibconfig (IbcDMA) instead.

Purpose

Enable or disable DMA.

Format

C

unsigned long ibdma (int ud, int v)

Visual Basic

CALL ibdma (ud%, v%)

or

status% = ildma (ud%, v%)

Interactive Control (Usage Notes)

ibdma v

Input

ud	Board descriptor
v	Enable or disable the use of DMA

Output

Function Return

The value of Ibsta

Description

ibdma enables or disables DMA transfers for the board, according to v. If v is zero, DMA is not used for GPIB I/O transfers. If v is non-zero, DMA is used for GPIB I/O transfers.

Possible Errors

ECAP	The interface is not configured to use a DMA channel.
EDVR	The NI-488.2 driver is either configured incorrectly or is not properly installed.
EHDL	ud is invalid or out of range.
ELCK	The requested operation could not be performed because of an existing lock by another process.
ENEB	The interface is not installed or is not properly configured.
EOIP	Asynchronous I/O is in progress.