debounce test

main.cpp

#ifdef F_CPU
#undef F_CPU
#define F_CPU 8000000UL
#endif

#include "buttonDebouncer.h"
#include "millis.h"

#define NR_OF_BUTTONS 5
uint8_t BUTTONS_LOCATION[NR_OF_BUTTONS] = {'C', 0, 1, 2, 3}; // all buttons on PORTC

enum Buttons{
    BTN_1  = 1,  // PC0
    BTN_2  = 2,  // PC1
    BTN_3  = 4,  // PC2
    BTN_4  = 8,  // PC3
}Buttons;
 
void blinkLED(uint8_t led_pin, uint8_t duration);

int main(void){
    buttons_t pressed_buttons = 0;
    buttons_t pushed_buttons = 0;
    buttons_t button_combination = 0;

    // set data direction register for PB0 through PB3 (for 4 LEDs) to output
    DDRB |= 0x0F;
 
    // Setup millis
    millis_init();
    
    // Setup button debouncer
    debouncerSetup(BUTTONS_LOCATION, NR_OF_BUTTONS);
    btnSetLongPressTime(2000);
    
    // Enable global interrupts
    sei();
    
    // signal that we're up by flashing of the three LEDs in turn
    for (uint8_t i = 0; i <= 3; ++i) {
        blinkLED(i, 100);
    }
    millis_reset();

    while(1){

        // Check if debouncing is complete
        if(DEBOUNCE_FINISH){

            DEBOUNCE_FINISH = 0;
            
            pressed_buttons = debouncerPressedButtons();
            pushed_buttons = debouncerPushedButtons();
            button_combination = debouncerButtonCombination();
                        
			// // If a button was long pressed 
			if (BUTTON_LONG_PRESS){
				// Check which button
				pushed_buttons = pressed_buttons;             
			}
                        
            if (button_combination == (BTN_1 | BTN_3)) {
                // buttons 1 and 3 were pushed so save configuration to EEPROM (in real program)
                // for this test, turn off all LEDs on PORTB
                PORTB &= ~0x0F;
            }

            // Check which button was pushed 
            switch (pushed_buttons) {
                 case BTN_1:
                    if (BUTTON_LONG_PRESS) {
                        // This button was long pressed, so turn off LED
                        PORTB &= ~_BV(PB0); // clear PB0 LED pin
                    } else {
                        // This button was pushed but not long pressed, so turn on LED (even if it was already on)
                        PORTB |= _BV(PB0); // set PB0 LED pin
                    }
                    break;
                case BTN_2:
                    if (BUTTON_LONG_PRESS) {
                        // This button was long pressed, so turn off LED
                        PORTB &= ~_BV(PB1); // clear PB1 LED pin
                    } else {
                        // This button was pushed but not long pressed, so turn on LED (even if it was already on)
                        PORTB |= _BV(PB1); // set PB1 LED pin
                    }
                    break;
                case BTN_3:
                    if (BUTTON_LONG_PRESS) {
                        // This button was long pressed, so turn off LED
                        PORTB &= ~_BV(PB2); // clear PB2 LED pin
                    } else {
                        // This button was pushed but not long pressed, so turn on LED (even if it was already on)
                        PORTB |= _BV(PB2); // set PB2 LED pin
                    }
                    break;
                case BTN_4:
                    if (BUTTON_LONG_PRESS) {
                        // This button was long pressed, so turn off LED
                        PORTB &= ~_BV(PB3); // clear PB3 LED pin
                    } else {
                        // This button was pushed but not long pressed, so turn on LED (even if it was already on)
                        PORTB |= _BV(PB3); // set PB3 LED pin
                    }
                    break;
            }
        }
    }
}
 
 // Millis timer
ISR(ISR_VECT){
    ++milliseconds;
    
    // Default: debouncing every 10ms, 1ms timer resolution
    buttonDebouncerTimer(); // 2.4us @ 8MHz
}

// function to blink an LED for a number of milliseconds (0-255)
void blinkLED(uint8_t led_pin, uint8_t duration) {
    millis_t start = millis_get();  // start: timestamp
    PORTB |= _BV(led_pin);          // set PORTB LED pin
    while (millis_get() - start < duration);
    PORTB &= ~_BV(led_pin);  // clear PORTB LED pin
}