C51的SPI程序例子，经典的spi-flash-spi-flash

外部存储flash驱动，读写可行。速度可达50mhz。和c51配合可完全利用彩色液晶显示大图-External storage flash drive, read and write possible. Speeds of up to 50mhz. And c51 can be fully utilized with the color liquid crystal display large map