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Chapter 16 Logical Device Transfer Methods

15-1

15. LOGICAL DEVICE TRANSFER METHODS

Depending on the acquisition needs, the device may be controlled through a Software control routine

within the board’s driver or via DMA through the PC’s system hardware. Typically high-speed acquisition

modes require DMA and slower modes can use software routines.

15.1 AL_SetDataTransferMethod

Prototype C\C++

ERRNUM AL_SetDataTransferMethod(LHLD lhld, LPSTR lpstrMethod);

Visual Basic for Windows

Function AL_SetDataTransferMethod(ByVal lhld As Long,

ByVal lpstrMethod As String) As Long

LHLD lhld handle of the LDSD

LPSTR lpstrMethod address of the transfer method string

The AL_SetDataTransferMethod function sets the hardware transfer operation method of the LDSD. See

section

4.2 OPERATING MODES for additional details.

Parameter Description

lhld Identifies the instance of the logical device subsystem.

lpstrMethod Points to the desired transfer mode string. The available settings are defined

in the ADLIB include file as follows:

• AL_DTM_SOFTWARE software data transfers

• AL_DTM_DMA DMA data transfers

Returns:

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

call.

Related Functions:

AL_GetDataTransferMethod

Program References:

Adlai01, Adlai02, Adlai04, Adlai05, Adlai07, Adlai08

Adlda01, Adlda02, Adlda03

Supported Logical Device Subsystems:

Pci55xx Series: CTR0, CTR1, CTR2, CTR3, Options: SOFTWARE

Note that CTR0, CTR1 Counters are referenced in the user manual as CNTR0/1 and

Timers CTR2, CTR3 are referenced in the user manual as TMR0/1.

Pci55xx Series: DIN0 to DIN3, DOT0 to DOT3, Options: SOFTWARE

Pci55xx Series: ADC0, DAC0, DAC1, Options: SOFTWARE or DMA

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Measurement-computing ADLIB WIN Manuale Utente Pagina 59