c - AVR 代码在第三次按下按钮后停止工作

Question

我希望我的代码在系统开机时首先闪烁，然后当按下 D3 上的按钮 B1 一次时，在按下它的那一刻冻结 LED 状态。然后在 B1 上再次按下，继续闪烁等等......

我的代码一直有效，直到我第二次按 B1。AVR 冻结在状态，但是当我第三次按 B1 时，什么也没有发生。我的范围有问题吗？

#include <avr/io.h>
#include <avr/interrupt.h>

#define LED1 PIND1
#define B2 PIND2
#define B1 PIND3
#define LED2 PIND4

    void turn_on();
    void turnoff();
    void toggle_led1();
    void toggle_led2();
    void blink();
    void led1_on_led2_off();

    int counter = 0;

    int main(void)
    {
        // Set variables
        DDRD |= 1 << LED1; //Set Direction for Output on PINB0 (Led 1)
        DDRD |= 1 << LED2; //Set Direction for Output on PINB0 (Led 2)
        DDRD &= ~(1 << B1); //Data Direction Register input PINB3 (Button B1)
        PORTD |= 1 << B1; //Set PINB3 to a high reading
        DDRD &= ~(1 << B2); //Data Direction Register input PINB4 (Button B2)
        PORTD |= 1 << B2; //Set PINB4 to a high reading



        int Pressed = 0;
        int Pressed_Confidence_Level = 0;
        int Released_Confidence_Level = 0;

        GICR |=(1<<INT0);//Enables int0 as an external interrupt
        MCUCR |= (1<<ISC01 | 1<<ISC00); // Generate interrupt on rising edge

        sei(); // Enable the global interrupts
        TCCR1B |= 1<<CS10 | 1<<CS11;  // start the timer at F_CPU/pre-scaler  
        OCR1A = 7812; // = 0.5 second


         turnoff();

         while(1)
         {
             if (bit_is_clear(PIND, 3))
             {
                 Pressed_Confidence_Level ++; //Increase Pressed Confidence
                 Released_Confidence_Level = 0; //Reset released button confidence since there is a button press
                 if (Pressed_Confidence_Level >500) //Indicator of good button press
                 {
                     if (Pressed == 0)
                     {
                         Pressed = 1;
                                             counter++;
                     }
                     //Zero it so a new pressed condition can be evaluated
                     Pressed_Confidence_Level = 0;
                 }
             }
             else
             {
                 Released_Confidence_Level ++; //This works just like the pressed
                 Released_Confidence_Level = 0; //Reset pressed button confidence since the button is released
                 if (Released_Confidence_Level >500)
                 {
                     Pressed = 0;
                     Released_Confidence_Level = 0;
                 }
             }

             if(counter%2==0)
             {
                 blink();
             }              

         }           


         return 0;      
    }        



    /* 
    TCCR0 is a control register used in pre-scaling.
    */

    void turn_on()
    {   
        PORTD |= 1 << LED1;// Turns on LED1 on port d
        PORTD |= 1 << LED2;// Turns on LED2 on port d
    }
    void turnoff()
    {
        PORTD &= ~(1 << LED1);
        PORTD &= ~(1 << LED2);
    }

    void toggle_led1()
    {
        PORTD ^= (1 << LED1);
    }
    void toggle_led2()
    {
        PORTD ^= (1 << LED2);
    }
    void blink()
    {
        if(TCNT1>7812)
        {
            toggle_led1();
            toggle_led2();

            TCNT1 = 0;
        }
    }
    void led1_on_led2_off()
    {
        PORTD |= 1 << LED1;
        PORTD &= ~(1 << LED2);
    }       

Answer 1

在 else 分支中递增后，您总是在重置 Released_Confidence_Level。