可二次开发的可以编译通过的VC++6.0源代码，且有硬件开发套件。有了它，在你需要做一个USB产品开发时，所有要做的就是在PC上修改源代码、调用几个函数读写I/O口。-Secondary development may be compiled through the VC++ 6.0 source code, and hardware development kit. With it, you need to do a USB product development, all in the PC to do is modify the source code, a few function calls to read and write I/O port.