niHSDIO_ConfigureRefClock
Specific Function
C Function Prototype
ViStatus niHSDIO_ConfigureRefClock (ViSession vi, ViConstString clockSource, ViReal64 clockRate);
Purpose
Configures the Reference clock. Use this function when you are using the On Board Clock as a Sample clock, and you want the Sample clock to be phase-locked to a reference signal. Phase-locking the Sample clock to a Reference clock prevents the Sample clock from "drifting" relative to the Reference clock.
Parameters
| Name | Type | Description |
|---|---|---|
| vi | ViSession | This handle identifies your instrument session. vi was obtained from the niHSDIO_InitAcquisitionSession or niHSDIO_InitGenerationSession function. |
| clockSource | ViConstString | Specifies the PLL Reference clock source. Refer to
NIHSDIO_ATTR_REF_CLOCK_SOURCE
for details. Defined Values NIHSDIO_VAL_NONE_STR ("None")—The device does not use a Reference clock. NIHSDIO_VAL_CLK_IN_STR ("ClkIn")—The device uses the signal present on the front panel CLK IN SMB jack connector as the Reference clock source. NIHSDIO_VAL_PXI_CLK10_STR ("PXI_CLK10")—The device uses the 10 MHz PXI backplane clock as the Reference clock source. This source is only available for PXI devices. NIHSDIO_VAL_RTSI7_STR ("RTSI7")—The device uses the signal on RTSI 7 as the Reference clock source. This source is only available for PCI devices. Default Value: NIHSDIO_VAL_NONE_STR |
| clockRate | ViReal64 | Specifies the Reference clock rate, expressed in Hz. Refer to
NIHSDIO_ATTR_REF_CLOCK_RATE
for details. Default Value: 10000000 |