base on usb mass storage , HY27Uf081G2A 128MByte nandflash and WX25Q16 2MByte SPIFlash. 
Now Add FatFs file System to this project 

2.add FatFs for NandFlash , and test ok
3.add SD Card with 1GByte storage, use usb_Bluk mount,but some Err occuls on the read and Write,it must be fix in next commit
4.增加USMART调试组件，使用串口工具对函数进行调用，从而不必每次都重新下载
5.解决无法识别USB问题，方法在于D+的上拉对应端口的初始化。