实现的功能如题，就是FPGA里实现从PC接收数据，然后把接收到的数据发回去。使用的是串口UART协议进行收发数据。上位机用的是老得掉牙的串口调试助手-To achieve the functions such as title, that is, to achieve FPGA receives data from the PC, and then receive data back fat. Using a UART serial port protocol to send and recei