基于FPGA DE2开发板的计算器设计。Verilog语言编写。矩阵键盘输入，LCD1602显示。程序包括按键扫描模块、数值处理计算模块和LCD控制写模块等。-Calculator design based on FPGA DE2 development board. language use Verilog. Matrix keyboard input, LCD1602 display. Program includes key scanning module and LCD module