Measurement-computing ADLIB WIN Manuel d'utilisateur télécharger pdf (Page 77)

Chapter 21 Clocking Modes

20-1

20. CLOCKING MODES

Clocking Modes provides either accurate timed device conversions or software-controlled conversions.

The PCI55xx series the AtoD or DtoA devices can be clocked from one of four sources as specified below,

in addition the DAC1 device can be clocked for the same clocking source selected by DAC0. To use the

AL_SetDAOutput function with the Pci55xx DAC0 or DAC1 the clocking source must also be configured

for “SOFTWARE_CONVERT”, in addition DAC0’s Trigger and Gating modes must be DISABLED.

20.1 AL_SetClockSource

Prototype C\C++

ERRNUM AL_SetClockSource(LHLD lhld, LPSTR lpstrSource);

Visual Basic for Windows

Function AL_SetClockSource(ByVal lhld As Long,

ByVal lpstrSource As String) As Long

LHLD lhld handle of the LDSD

LPSTR lpstrSource address of the clock source string

The AL_SetClockSource function sets the hardware clocking source of the LDSD.

Parameter Description

lhld Identifies the instance of the logical device subsystem.

lpstrSource Points to the desired clock source string. The available string settings are

device independent and are verified by ADLIB against the available clock

source options specified in the device's capabilities file.

Returns:

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

call.

Related Functions:

AL_SetClockRate

AL_GetActualClkRate

AL_MaxClkRate

AL_GetClockStruct

Supported Logical Device Subsystems:

Pci55xx Series: ADC0,Options: “SOFTWARE_CONVERT“, “INTERNAL“,

“EXT_RISING_EDGE“ or

“EXT_FALLING_EDGE“

Pci55xx Series: DAC0, DAC1Options: “SOFTWARE_CONVERT“, “INTERNAL“,

“EXT_RISING_EDGE“ or

“EXT_FALLING_EDGE“

Pci55xx Series: DAC1 Options: In addition, setting DAC1 clock source to

“CLKSCR_DAC0_SELECTED“ will synchronize

DAC1 to DAC0 clocking source.

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Measurement-computing ADLIB WIN Manuel d'utilisateur Page 77