Button.cpp

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#include "Button.hpp"
 
AH_DIAGNOSTIC_WERROR() // Enable errors on warnings
 
BEGIN_AH_NAMESPACE
 
using namespace ExtIO;
 
Button::Button(pin_t pin) : pin(pin) {}
 
void Button::begin() { ExtIO::pinMode(pin, INPUT_PULLUP); }
 
void Button::invert() { invertState = true; }
 
#ifndef AH_INDIVIDUAL_BUTTON_INVERT
bool Button::invertState = false;
#endif
 
Button::State Button::update() {
    // read the button state and invert it if "invertState" is true
    bool input = ExtIO::digitalRead(pin) ^ invertState;
    bool prevState = debouncedState & 0b01;
    unsigned long now = millis();
    if (now - prevBounceTime > debounceTime) { // wait for state to stabilize
        debouncedState = static_cast<State>((prevState << 1) | input);
    } else {
        debouncedState = static_cast<State>((prevState << 1) | prevState);
    }
    if (input != prevInput) { // Button is pressed, released or bounces
        prevBounceTime = now;
        prevInput = input;
    }
    return debouncedState;
}
 
Button::State Button::getState() const { return debouncedState; }
 
const __FlashStringHelper *Button::getName(Button::State state) {
    switch (state) {
        case Button::Pressed: return F("Pressed");
        case Button::Released: return F("Released");
        case Button::Falling: return F("Falling");
        case Button::Rising: return F("Rising");
        default: return F("<invalid>"); // Keeps the compiler happy
    }
}
 
unsigned long Button::previousBounceTime() const { return prevBounceTime; }
 
unsigned long Button::stableTime(unsigned long now) const {
    return now - previousBounceTime();
}
 
unsigned long Button::stableTime() const { return stableTime(millis()); }
 
void Button::setDebounceTime(unsigned long debounceTime) {
    Button::debounceTime = debounceTime;
}
 
unsigned long Button::getDebounceTime() { return Button::debounceTime; }
 
unsigned long Button::debounceTime = BUTTON_DEBOUNCE_TIME;
 
END_AH_NAMESPACE
 
AH_DIAGNOSTIC_POP()