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:
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 |