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Viewing changes to src/utility/Bounce.cpp

  • Committer: Dan
  • Date: 2011-11-03 00:54:13 UTC
  • Revision ID: dan@waxworlds.org-20111103005413-miheyjsrpm3a0r1e
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src/utility/Bounce.cpp
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// Please read Bounce.h for information about the liscence and authors
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#include <Arduino.h>
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#include "Bounce.h"
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Bounce::Bounce(uint8_t pin,unsigned long interval_millis)
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{
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        interval(interval_millis);
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        previous_millis = millis();
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        state = digitalRead(pin);
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    this->pin = pin;
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}
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void Bounce::write(int new_state)
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       {
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        this->state = new_state;
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        digitalWrite(pin,state);
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       }
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void Bounce::interval(unsigned long interval_millis)
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{
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  this->interval_millis = interval_millis;
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  this->rebounce_millis = 0;
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}
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void Bounce::rebounce(unsigned long interval)
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{
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         this->rebounce_millis = interval;
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}
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int Bounce::update()
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{
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        if ( debounce() ) {
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        rebounce(0);
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        return stateChanged = 1;
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    }
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     // We need to rebounce, so simulate a state change
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        if ( rebounce_millis && (millis() - previous_millis >= rebounce_millis) ) {
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        previous_millis = millis();
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                 rebounce(0);
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                 return stateChanged = 1;
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        }
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        return stateChanged = 0;
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}
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unsigned long Bounce::duration()
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{
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  return millis() - previous_millis;
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}
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int Bounce::read()
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{
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        return (int)state;
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}
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// Protected: debounces the pin
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int Bounce::debounce() {
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        uint8_t newState = digitalRead(pin);
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        if (state != newState ) {
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                if (millis() - previous_millis >= interval_millis) {
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                        previous_millis = millis();
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                        state = newState;
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                        return 1;
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        }
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  }
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  return 0;
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}
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// The risingEdge method is true for one scan after the de-bounced input goes from off-to-on.
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bool  Bounce::risingEdge() { return stateChanged && state; }
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// The fallingEdge  method it true for one scan after the de-bounced input goes from on-to-off. 
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bool  Bounce::fallingEdge() { return stateChanged && !state; }
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