avr单片机，通过编辑键盘实现定义按键，按键连续按可以连续发送字符，并且在数码管上显示出来，在vc中可以编辑，也可以在cvavr下编辑运行-avr microcontroller achieved by editing the definition of the keyboard keys, key continuous press can send characters continuously, and displayed on the digital control in vc can e