63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
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/*
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Debounce - v1.1 - November 19, 2014.
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Arduino library for button debouncing.
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Clearly based on the debounce example from the site:
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http://arduino.cc/en/Tutorial/Debounce
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Created by William Koch.
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Released into the public domain.
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*/
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#include "Debounce.h"
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// Debounces an input pin.
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// 50ms as default debounce delay.
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Debounce::Debounce(byte button, boolean invert, boolean pullup) {
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pinMode(button, pullup ? INPUT_PULLUP : INPUT);
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_button = button;
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_delay = 50; // default delay.
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_state = _lastState = _reading = (invert ^ digitalRead(_button));
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_last = millis();
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_count = 0;
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_invert = invert;
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}
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// Debounces an input pin.
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// Adjustable debounce delay.
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Debounce::Debounce(byte button, unsigned long delay, boolean invert, boolean pullup) {
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pinMode(button, pullup ? INPUT_PULLUP : INPUT);
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_button = button;
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_delay = delay; // user defined delay.
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_state = _lastState = _reading = (invert ^ digitalRead(_button));
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_last = millis();
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_count = 0;
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_invert = invert;
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}
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byte Debounce::read() {
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_reading = _invert ^ digitalRead(_button); // get current button state.
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if (_reading != _lastState) { // detect edge: current vs last state:
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_last = millis(); // store millis if change was detected.
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_wait = true; // Just to avoid calling millis() unnecessarily.
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}
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if (_wait && (millis() - _last) > _delay) { // after the delay has passed:
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if (_reading != _state) { // if the change wasn't stored yet:
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_count++; // Stores each change.
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_state = _reading; // store the button state change.
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_wait = false;
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}
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}
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_lastState = _reading;
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return _state;
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}
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// Returns the number of times the button was pressed.
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unsigned int Debounce::count() {
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Debounce::read();
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return _count / 2; // Counts only a full press + release.
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}
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void Debounce::resetCount() {
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_count = 0;
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return;
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}
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