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DEBOUNCE

NAME
SYNOPSIS
DESCRIPTION
FUNCTIONS
PINS
PARAMETERS

NAME

debounce − filter noisy digital inputs

SYNOPSIS

loadrt debounce [cfg=size[,size,...]]

Creates filter groups each with the given number of filters (size). Each filter group has the same sample rate and delay.

DESCRIPTION

The debounce filter works by incrementing a counter whenever the input is true, and decrementing the counter when it is false. If the counter decrements to zero, the output is set false and the counter ignores further decrements. If the counter increments up to a threshold, the output is set true and the counter ignores further increments. If the counter is between zero and the threshold, the output retains its previous state. The threshold determines the amount of filtering: a threshold of 1 does no filtering at all, and a threshold of N requires a signal to be present for N samples before the output changes state.

FUNCTIONS

debounce.G

Sample all the input pins in group G and update the output pins.

PINS

debounce.G.F.in bit in

The F’th input pin in group G.

debounce.G.F.out bit out

The F’th output pin in group G. Reflects the last "stable" input seen on the corresponding input pin.

PARAMETERS

debounce.G.delay signed rw

Sets the amount of filtering for all pins in group G.