niHSDIO_ConfigurePatternMatchStartTrigger

Specific Function

C Function Prototype

ViStatus niHSDIO_ConfigurePatternMatchStartTrigger (ViSession vi, ViConstString channelList, ViConstString pattern, ViInt32 triggerWhen);

Purpose

Configures the Start trigger for pattern-match triggering. This function is only valid for acquisition operations.

Valid Syntax:
Both of the following examples are valid and do the same thing. The order of channelList determines the order of the pattern string.

• niHSDIO_ConfigurePatternMatchStartTrigger (vi, "19-0", "0000 0XXX XX11 1111 1111");
• niHSDIO_ConfigurePatternMatchStartTrigger (vi, "0-19", "1111 1111 11XX XXX0 0000");

Note  The logic levels seen by pattern matching are affected by data interpretation.

Parameters

Name	Type	Description
vi	ViSession	This handle identifies your instrument session. vi was obtained from niHSDIO_InitAcquisitionSession.
channelList	ViConstString	This string specifies which channels will be configured for pattern matching using the pattern string. The order of channels in the list determines the order of the pattern string.
pattern	ViConstString	This string expression describes the pattern to be matched. This expression is composed of the following characters: X or x: Ignore the channel 1: Match on a logic 1 0: Match on a logic 0 R or r: Match on a rising edge F or f: Match on a falling edge E or e: Match on either edge The first character in the expression corresponds to the first channel in channelList. The number of characters in pattern must correspond to the number of channels specified in channelList.
triggerWhen	ViInt32	Specifies the when the trigger asserts. Defined Values NIHSDIO_VAL_PATTERN_MATCHES (36)—The trigger asserts when the pattern matches. NIHSDIO_VAL_PATTERN_DOES_NOT_MATCH (37)—The trigger asserts when the pattern does not match. Default Value: NIHSDIO_VAL_PATTERN_MATCHES

Return Value