实现SPI FLASH 通信，首先配置GPIO,然后初始化SPI FLASH DRIVER,获得FLASH ID,接着就可以读写SPI FLASH 了(Implement SPI FLASH communications, first configure GPIO, then initialize the SPI FLASH DRIVER, get FLASH ID, and then they can read and write SPI FLASH up))

SPI flash芯片 W25Q128芯片的驱动程序，16M空间。(the driver for spi flash chip W25Q128, the total space is 16M)

SPI FLASH MX25L25635参考驱动代码,很实用(SPI FLASH MX25L25635 Reference driver code, very practical)