基于DE2 FPGA开发板的电冰箱控制系统源代码。Quartus 2开发环境。主要功能有检查系统输入，PWM输出，控制LED等。-Based on DE2 FPGA development board refrigerator control system source code. Quartus 2 development environment. The main function is to check the system input, PWM output, control LED a