按键的识别算法，消除按键的抖动，一键多功能等，-Identification of key algorithms, keys to eliminate jitter, a key multi-function, etc.

基于VHDL语言编写，可下载到FPGA板子上实现的cordic算法实现的设计，并用该算法实现sin和cos的计算，计算结果显示在数码显示管上，已包含按键防抖动功能的实现。-Based on VHDL language, can be downloaded to the the cordic algorithm implemented in the FPGA board to achieve the design and calculation of sin and cos using this