用stm32f103控制nand flash，采用DMA方式把FPGA传输过来的数据存到Flash里，输入f1,f2,f3可以实现读取FLASH内容到串口助手。(The NAND flash is controlled by STM32F103, and the data transmitted by FPGA is stored in Flash by DMA way. Input F1, F2, F3 can read FLASH content to serial assistant.)