说明：  1)设计一个由万年历改装的报时表和闹钟 2)复习GPIO、SPI的7段数码显示管的工作原理和应用 3)了解和掌握实时时钟的工作原理及应用 4)学会综合以前所学的知识实现新的功能 5)更加熟悉Easy-ARM2138开发板的结构和使用方法
(1) design a modification to the time table by the calendar and alarm clock 2) Review GPIO, SPI' s 7-segment display tubes of the working principle and application 3) understanding and knowledge of the working principle of real-time clock and application 4) Institute of Comprehensive knowledge of previously learned implement new features 5) more familiar with the Easy-ARM2138 development board' s structure and use)