嵌入式基础

#define TIME_Addr  0xFFFFC0000
#define TIME *(volatile int *) (TIME_Addr+2)//这里需要将地址＋2

int getHours()
{
    int time = TIME;
    return (time>>11) & 0x1F;
}

void SetHours(int hours)
{
    int oldtime = TIME;
    int newtime = oldtime & ~ (0x1F << 11);//将小时清零，保留分钟与秒钟
    newtime |= (hours & 0x1F) << 11;//设置小时时间
    TIME = newtime;
}