这是基于FPGA的USB通讯程序。通过在quartus中建立SOPC，建立PIO口，并在NIOS中写驱动和寄存器等，实现USB通信。经检验，该程序通信正常。-This is FPGA-based USB communication program. By establishing the quartus in SOPC, establish PIO mouth and NIOS to write drivers and registers, realize USB communications.