通过2440使触摸屏控制LCD显示RTC时钟，并通过触摸屏设置RTC的时间，并设置闹钟（用PWM实现铃声，通过IIC功能向AT24C02存储芯片写入闹钟）-By 2440 the touch screen LCD display to clock the RTC and the RTC through the touch screen to set the time, and set the alarm clock (with PWM to achieve ring, through the I