fm25xx系列铁电存储SPI驱动，包括对铁电的初始化、写数据到铁电和从铁电中读取数据，函数都有中文解释，对新手的理解很有帮助-Fm25xx series ferroelectric memory SPI driver, including the initialization of ferroelectric, write data to the ferroelectric and read data　the ferroelectric, function have Chinese interpretation, understanding is very helpful for beginners