其中的usb端口通信已经作为一个模块来使用，用户只需用以下函数就可以对usb端口进行方便的读写：

unsigned char D12_WriteEndpoint(unsigned char endp, unsigned char len, unsigned char * buf) 此为usb端点输出函数，endp是要进行通信的端点，取值为3（普通端点，最大可一次传输16byte）或5（主端点，最大可一次传输64byte）；len为一次输出数据长度；*buf为数据所在位置。

usb端点数据的读操作是由底层函数自动完成的（相关函数为unsigned char D12_ReadEndpoint(unsigned char endp, unsigned char len, unsigned char * buf)； 相应端点为2和4），所读到的数据存于GenEpBuf[]（普通端点）、MainEpBuf[]或EpBuf[]（主端点）中，用户可以直接读取使用。-the usb port which has a communications module to use, Users only need to use the following function, it can usb port for convenient reading and writing : unsigned char D12_WriteEndpoint (unsigned ch ar endp, unsigned char len. unsigned char* buf) usb endpoint of this output function, endp to the endpoint of communication, value for the three (general endpoint. a maximum transmission 16 byte), or 5 (the main endpoint, a maximum transmission 64byte); len output data for a length;* buf for data location. Usb endpoint data read operation from the bottom of the complete automatic function (correlation function for unsigned char D12_ReadEndpoint (unsigned char endp. unsigned char len, unsigned char* buf); corresponding endpoint of 2 and 4), which read data stored in GenEpBuf [] (General e