VI to detect edges (transitions) in a bitstream

LabVIEW SubVI: util_EdgeDetector.vi

• Description: Detect edges (transitions) in a bitstream, and indicate rising edge, falling edge, or either edge as three distinct outputs.
• Category: General-purpose utility ("util" prefix)

Inputs (Controls)

1. bitstream in -- 1-D array of Boolean

Parentheses ( ) indicate default value; square brackets [ ] designate units.

Outputs (Indicators)

1. rising edge -- 1-D array of Boolean
2. falling edge -- 1-D array of Boolean
3. either edge -- 1-D array of Boolean

Required Behavior

• Each of the three Boolean output indicators is an array of the same size as the input bitstream.
• rising edge is T whenever the the input bitstream sequence changes from F to T.
• falling edge is T whenever the the input bitstream sequence changes from T to F.
• either edge is the logical "OR" of the previous two indicator outputs.

LabVIEW Coding Tips

View the screencast video in Create a SubVI in LabVIEW to learn the mechanics of subVIs.

Refer to the Figure 1 screencast video for LabVIEW coding tips and techniques specific to this subVI.

Figure 1: [video] LabVIEW coding tips and techniques for util_EdgeDetector.vi

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