在AVR开发板驱动时钟芯片DS1302，利用1602液晶显示当前的年、月、日、星期、时间，并利用矩阵按键来实现调时功能-In the AVR development board-driven clock chip DS1302, use 1602 liquid crystal display current year, month, day, week, time, and use buttons to achieve the transfer matrix when the function