通过CRC-16循环冗余校验的方式实现数据传输与控制，例如控制LED灯、蜂鸣器、发送数据到上位机-By CRC-16 cyclic redundancy check means to achieve data transmission and control, such as control of LED lights, buzzer, sending the data to the host computer

7219级联显示16个数码管的驱动程序，与单片机通过串口通信。简单实用。-7219 Cascade 16 LED display drivers, and the microcontroller through the serial port communication. Simple and practical.