实现一个苏打可乐售卖机，包括时钟分频，自动找零，能否售卖成功等功能。是中山大学移动信息工程学院数字设计的基础练习之一。-Achieve a Coke vending machine soda, including the clock divider, automatic change, the ability to sell successfully, and other functions. Exercise is one of the basic movement of Information Engineering, Sun Yat-digital designs.