我仍然处于C++的初学者水平。我需要使用中断和计时器来消除按钮（PCINT 10）的抖动。我使用的是atmega 328 p微控制器和HW-262屏蔽。目前使用timer 0将时间增加1 ms。
这是我目前为止的代码的一部分：

ISR(TIMER0_COMPA_vect) {
    now++; //increment by 1ms
}
//interrupt setup
    PCICR = 0b00000010; 
    PCIFR = 0b00000010;
    PCMSK1 = 0b00000100;// interrupt on PCINT10

//global variables
uint8_t A2 = 0b00000100;
uint32_t A2_time = 0;
uint32_t buttons;
uint32_t oldb = 0;
uint32_t newb;

//ISR
ISR(PCINT1_vect) {
    newb = PINC;
    int changed = oldb ^ newb; // changed is 1 for buttons that have changed
    if (changed & A2) {
        if ((now - A2_time) > 10) { // 10 ms debounce
            // new S1_A1 press
            A2_time = now;
            if ((oldb & ~newb) & A2) {
                buttons |= A2;
            }
        }
    }
}

//calling button to change states (not part of the ISR)
if (((PINC & A2) == 0)) { //if A2 pressed
                    current_state = Pause;
                }

ISR对按钮没有影响。仍检测到多次按钮按下。