基于HAL库的STM32F072 USB通信程序。将USB枚举为CDC方式，使用虚拟串口与PC进行通信，可以达到发送和接收500+KB/s的传输速度。并在自建eval文件中实现I2C通信。可根据自己需要将main.C进行修改。(STM32F072 USB communication program based on HAL library.The USB enumeration is the CDC way, and the virtual serial port is used to comm

此上传文件实现的功能就是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。(The function of this upload file is to receive data from PC in FPGA and send back the received data.The serial port UART protocol is used to receive and receive data.)