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    This module is included inLens: Analog / Digital Communications with National Instruments LabVIEW
    By: Sam ShearmanAs a part of collections:"SubVI Specifications for "Communication Systems Projects with LabVIEW"", "Communication Systems Projects with LabVIEW"

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util_BitstreamToText.vi

Module by: Ed Doering. E-mail the author

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Summary: Build a LabVIEW subVI to interpret a bitstream as a text character sequence.

Table 1
LabVIEWtop.png This module refers to LabVIEW, a software development environment that features a graphical programming language. Please see the LabVIEW QuickStart Guide module for tutorials and documentation that will help you:
• Apply LabVIEW to Audio Signal Processing
• Get started with LabVIEW
• Obtain a fully-functional evaluation edition of LabVIEW

Note:

Visit LabVIEW Setup to learn how to adjust your own LabVIEW environment to match the settings used by the LabVIEW screencast video(s) in this module. Click the "Fullscreen" button at the lower right corner of the video player if the video does not fit properly within your browser window.

LabVIEW SubVI: util_BitstreamToText.vi

  • Description: Interpret a bitstream as a sequence of text characters. Framing bits (start bit and stop bit) may optionally have been added to the bitstream, and are removed. Framing errors (mismatch between expected and actual values of framing bits) are indicated.
  • Category: General-purpose utility ("util" prefix)

Inputs (Controls)

  1. bitstream in -- Boolean 1-D array
  2. includes framing bits (F) -- Boolean
  3. start bit value (T) -- Boolean

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

Outputs (Indicators)

  1. text out -- string
  2. framing error? -- 1-D Boolean array

Required Behavior

  • The bitstream must follow the indexing schemes imposed by the LabVIEW built-in nodes "Boolean Array to Number" and "Byte Array to String."
  • When includes framing bits is true, the start bit leading the 8-element Boolean subarray (a single text character) and the trailing stop bit will be removed from the bitstream before converting to text. In addition, the start bit will be compared to the expected value start bit value; the same holds true for the stop bit, which is assumed to be the complement of start bit value. Any mismatch is to be flagged as a framing error by setting framing error? true.

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_BitstreamToText.vi
Figure 1 (subVI_util_BitstreamToText-vi.htm)

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A lens is a custom view of Connexions content. You can think of it as a fancy kind of list that will let you see Connexions through the eyes of organizations and people you trust.

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