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端口进行方便地读写：

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。-Usb port communication which has been used as a module, the user can use the following function on the usb port can easily read and write:

　　 unsigned char D12_WriteEndpoint (unsigned char endp, unsigned char len, unsigned char* buf)　This is the endpoint usb output function, endp is to communicate the endpoint, the value for 3 (common endpoint, the first transmission maximum 16byte) or 5 ( the main endpoint, the first transmission maximum 64byte)　len Length of output data for the first time * buf location for data.

　　 usb endpoint data is read from the bottom of the auto-complete function (correlation function for unsigned char D12_ReadEndpoint (unsigned char endp, unsigned char len, unsigned char* buf)　the corresponding endpoint of 2 and 4), the read data stored in GenEpBuf [] (common endpoint), MainEpBuf [] or EpBuf [] (the main endpoint), the user can use a direct reading.