用于FPGA的按键消抖的Verilog文件，经过modelsim仿真和下板验证。-Verilog file for FPGA key debounce, after modelsim simulation and verification under the plate.

实现按键消抖级检测，通过检测按键，实现LED灯的亮或灭(To achieve the key jitter level detection, through the detection button, LED lights to achieve brightness or extinction)