一种基于STM32的NAND flash的块分配框架设计

STM32对大容量数据文件存储与管理问题可通过NAND flash来解决。而NAND flash的高效管理需要文件系统参与。NAND flash有特殊的块读写及擦除机制,一般的嵌入式文件系统组织结构并不完全兼容NAND flash。针对NAND flash的特点兼顾STM32的资源承受力要提出新的NAND flash块分配框架,框架通过块分配槽这种数据结构,在不使用块分配表与垃圾表的情况下,实现了NAND flash均衡负载与垃圾块的回收；同时通过节点分配栈与文件节点表的配合来提高STM32对文件的读写速度,空间利用率和系统性能。仿真实验和计算结果表明该块分配框架可有效提高NAND flash块的均衡负载与节省RAM空间。

A BLOCK ALLOCATION FRAME DESIGN BASED ON NAND FLASH OF STM32

The problem that store and management of STM32 to large volume data files can be solved through large capacity NAND flash. The high efficient management of NAND flash needs the participant of file system. NAND flash has special read,/write and erasure mechanism, and general embedded file system organization structure can not be completely compatible with NAND flash. A new NAND flash blocks allocation frame is proposed aiming at the characteristics of NAND flash and the capability of STM32 resources, which realizes the balanced load and recycle of invalid blocks of NAND flash through block allocation box without using block allocation table and invalid block, and enhances the read/write speed to files, the utility rate of space and system performance through node allocation stack and file node table at the same time. Simulation experiment and calculation result indicate that the block allocation frame can efficiently realizes the balanced load and the saving of RAM space.