This version (02 Aug 2012 16:52) was approved by William Jahn.
This is an old revision of the document!
Push and Hold
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This block can be used for functions like a pushbutton, to condition a GPIO input to create pulses in response to the user pushing or holding the button.
A typical application would be a volume control comprising two buttons, one for up and the other for down.
Drag the block into the workspace.
Right-click it and select the algorithm:
Set the parameters to fit your application:
|Determines how long the signal is held before the repeat pulses are generated.
|Sets the interval between repeated pulses. Enter the time in milliseconds in the field.
Note: For the picture above right, push_hold was selected. Use push/hold 2-in 2-out to condition two GPIO
inputs, for example one up and one down. Push/hold with mute works the similarly but with the extra feature that if both buttons are pressed, a mute pulse is generated (bottom output pin). To un-mute, any of the buttons can be pressed.