Digilent WaveForms User Manual download pdf (Page 67)

WaveForms™ SDK Reference Manual

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9.4 Trigger Detector

In order to use trigger on digital in pins, set trigger source with FDwfDigitalInTriggerSourceSet to

trigsrcDetectorDigitalIn.

FDwfDigitalInTriggerInfo(HDWF hdwf,

unsigned int *pfsLevelLow, unsigned int *pfsLevelHigh,

unsigned int *pfsEdgeRise, unsigned int *pfsEdgeFall)

Parameters:

- hdwf – Interface handle.

- pfsLevelLow – Variable to receive the supported low state triggers.

- pfsLevelHigh – Variable to receive the supported low state triggers.

- pfsEdgeRise – Variable to receive the supported rising edge triggers.

- pfsEdgeFall – Variable to receive the supported falling edge triggers.

The function above returns the supported digital in triggers. The bits of the arguments represent pins.

The logic for the trigger bits is: Low and High and (Rise or Fall). Setting a bit in both rise and fall will trigger on any

edge, any transition. For instance FDwfDigitalInTriggerInfo(hdwf, 1, 2, 4, 8) will generate trigger when DIO-0 is low

and DIO-1 is high and DIO-2 is rising or DIO-3 is falling.

FDwfDigitalInTriggerSet(HDWF hdwf,

unsigned int fsLevelLow, unsigned int fsLevelHigh,

unsigned int fsEdgeRise, unsigned int fsEdgeFall)

Parameters:

- hdwf – Interface handle.

- fsLevelLow – Set low state condition.

- fsLevelHigh – Set high state condition.

- fsEdgeRise – Set rising edge condition.

- fsEdgeFall – Set falling edge condition.

The function above is used to configure the digital in trigger detector.

FDwfDigitalInTriggerGet(HDWF hdwf,

unsigned int *pfsLevelLow, unsigned int *pfsLevelHigh,

unsigned int *pfsEdgeRise, unsigned int *pfsEdgeFall)

Parameters:

- hdwf – Interface handle.

- pfsLevelLow – Variable to receive the configured value.

- pfsLevelHigh – Variable to receive the configured value.

- pfsEdgeRise – Variable to receive the configured value.

- pfsEdgeFall – Variable to receive the configured value.

The function above returns the configured digital in trigger detector option.

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Digilent WaveForms User Manual Page 67