Measurement-computing ADLIB WIN Manuel d'utilisateur télécharger pdf (Page 140)

Chapter 40 Buffer Handler Functions

27-20

27.19 AL_SetPackedData

Prototype C\C++

ERRNUM AL_SetPackedData(LHLD lhld, long lState);

Visual Basic for Windows

Function AL_SetPackedData(ByVal lhld As Long, ByVal lState As Long) As Long

LHLD lhld handle of the LDSD

long lState specifies the FIFO state

The AL_SetPackedData function enables the hardware to pack two data points into each 32-bit transfer.

Essentially this function affects whether a device subsystem transfers one or two data points at a time. The

Pci5500 and Pci55xx devices place their associated channel information in place of the second data point

when PackedData mode is ENABLED.

Parameter Description

lhld Identifies the instance of the logical device subsystem.

lState Specifies the Packed FIFO state.

• DISABLED The device subsystem transfers two data points.transfers.

• ENABLED The device subsystem transfers one data point, for the

PCI-55XX Series cards, the hardware contains

the channel/gain/CJ information for each channel

Returns:

On success ERRNUM is set to 1, otherwise ERRNUM contains the last error code that occurred during the

call.

Related Functions:

AL_GetDoneBuffPtr

AL_GetBuffPtr

AL_CopyBuffer

AL_SetBuffer

AL_SetBufferSize

AL_GetPackedData

Supported Logical Device Subsystems:

Pci55xx: ADC0, DAC0, -DAC1, Options: ENABLED, DISABLED

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Measurement-computing ADLIB WIN Manuel d'utilisateur Page 140