这是C8051F020单片机读、擦、写串行EEROM芯片M25P40(4M)的驱动程序。全部为自己根据25p40的datasheet编写的，都能够成功使用。M25P40容量大，价格便宜，SPI接口，与8051单片机接口方便。,this is the driver of C8051F serial MCU to the EEROM chip M25P40.

提供stm32的flash的在线改写烧录功能和spi通讯-Stm32 the flash to provide online writers to rewrite the function and spi communication

C8051F020 spi 例子程序参考。-C8051F020 SPI example program reference.