#define F_CPU 8000000UL

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

class Car
{
private:
    bool getKey(void) const;
public:
    Car(void);
    void run(void);
    void write(bool onebyte = false) const;
};

Car::Car(void)
{
    DDRB = 0x01;
    PORTB = 0x01;
    DDRD = 0x00; // PD7设为输入
    PORTD = 0x80; // PD7设为带上拉电阻的输入
}

bool Car::getKey(void) const
{
    return ((PIND & 0x80) == 0);
}

void Car::run(void)
{
    while (1)
    {
        if (getKey())
        {
            _delay_ms(1000);
            PORTB ^= 0x01;
        }
        else
            PORTB = 0x00;
    }
}

void Car::write(bool onebyte) const
{
    if (onebyte)
        eeprom_write_byte((uint8_t *)15, 0xa3);
    else
        eeprom_write_block("This is a string.", (void *)0, 17);
}

int main(void)
{
    Car car;
    car.run();
    return 0;
}

不过遗憾的是，由于没有头文件<iostream>和<string>，所以没法使用std::string字符串类。

默认情况下，new和delete运算符也无法使用：
严重性 代码 说明 项目 文件 行
错误  undefined reference to `operator new[](unsigned int)' GccApplication2 E:\用户的文档\Octopus\Documents\Atmel Studio\7.0\GccApplication2\GccApplication2\main.cpp 52
错误  ld returned 1 exit status GccApplication2 collect2.exe 0
错误  recipe for target 'GccApplication2.elf' failed GccApplication2 E:\用户的文档\Octopus\Documents\Atmel Studio\7.0\GccApplication2\GccApplication2\Debug\Makefile 108
错误  undefined reference to `operator delete[](void*)' GccApplication2 E:\用户的文档\Octopus\Documents\Atmel Studio\7.0\GccApplication2\GccApplication2\main.cpp 52