用quartusII编写的，基于vhdl语言的按键加法器，从0到11，也可通过拨码开关控制，从11到0，加入了键盘防手抖。-QuartusII prepared to use, based on the VHDL language button adder, from 0-11, also available via dial code switch control, from 11-0, joined the anti-tremor keyboard.