编写一段c++代码实现avr单片机程序功能：平时8个LED闪烁，点亮/熄灭时间为0.5秒，一旦INT1触发中断，蜂鸣器发出5s的报警声

好的，以下是 C 代码实现的示例，实现了平时8个 LED 闪烁，点亮/熄灭时间为 0.5 秒，一旦 INT1 触发中断，蜂鸣器发出 5 秒的报警声：

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

#define LED_PORT PORTB
#define LED_DDR DDRB
#define LED_MASK 0xFF
#define BUZZER_PORT PORTD
#define BUZZER_DDR DDRD
#define BUZZER_PIN PD2

volatile uint8_t interrupt_occurred = 0;

ISR(INT1_vect) {
    interrupt_occurred = 1;
}

int main(void) {
    // Configure LED pins as output
    LED_DDR |= LED_MASK;

    // Configure buzzer pin as output
    BUZZER_DDR |= (1 << BUZZER_PIN);

    // Configure external interrupt INT1
    MCUCR |= (1 << ISC11);  // Trigger on falling edge
    GICR |= (1 << INT1);    // Enable interrupt

    while (1) {
        // Toggle LED pins
        LED_PORT ^= LED_MASK;
        _delay_ms(500);  // Delay 500 ms

        if (interrupt_occurred) {
            // Turn on buzzer for 5 seconds
            BUZZER_PORT |= (1 << BUZZER_PIN);
            _delay_ms(5000);
            BUZZER_PORT &= ~(1 << BUZZER_PIN);
            interrupt_occurred = 0;
        }
    }
}

注意，这只是示例代码，实际实现中可能需要更多的配置和处理。在实际中使用时，请务必仔细检查代码并进行测试。