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FRC LabVIEW Tutorials

Memory Library

What is this

The memory library is a VI package of low level Boolean memory vi's that are built to allow for better code re-usability.

Why is this published

Pursuant with FRC Rule R13, FRC Team# 3937 has chosen this as their outlet to release code that is intended for reuse.

Detailed descriptions

Below is an inclusive list of the vi's included in the library and their function. All vi's are configured so each instance has its own memory (if used multiple times, each time is completely independent of the others).

• Edge Detector
  This vi can be used to detect the first time a signal becomes true, or false, or both. Its primary use is in conjunction with a joystick button and can be used to trigger an event on when the button is first pressed or similar using another mode.
• SR Flip Flop
  This vi implements a software version of the hardware JK Latch with an enable bit.
  In short,

  Summary of SR Flip Flop Operation
  Set	Reset	Enable	Output
  False	False	Either	Previous Value (defaults to false, memory is retained)
  Either	Either	False	Previous Value (defaults to false, memory is retained)
  True	False	True	True
  False	True	True	False
  True	True	True	The opposite of the previous value

  Download

  Click here to download. VI Package Manager required (likely already installed).