Embedded File System

RL-FlashFS

RL-Flash File System (RL-FlashFS) is a software library that provides a common API to create, save, read, and modify files on a Flash device. The library offers interface functions and handles the low level file input and output operations. Developer can focus on the application needs rather than concerning about the implemented file system. RL-FlashFS works with several ARM- and Cortex-M processor-based devices, and can be used standalone or with the RTX-RTOS. RL-FlashFS applications are written using standard C constructs and are compiled with the ARM RealView® Compiler.

RL-FlashFS supports several media types, such as standard Secure Digital (SD), Secure Digital High Capacity (SDHC), Multi Media Card (MMC), and Flash Memory Cards. Flash File System Features lists the RL-FlashFS characteristics.

The picture below relates the media types to the file system supported by RL-FlashFS.

The file system depends on the memory device type used in the application and is selected automatically by RL-FlashFS. The following file systems are supported:

FAT File System

Supports the FAT12, FAT16, and FAT32 file system. This file system is used for memory card devices (SD Cards), USB Memory sticks, and NAND Flash devices. RL-FlashFS provides a NAND Flash Translation Layer for wear leveling, bad block management, and error correction.

Embedded File System

Is optimized for low density Flash devices (NOR Flash), SPI Flash, and RAM devices. This file system is not FAT-compatible and cannot be used as USB mass storage device. File names are preprocessed to remove the path information for non-FAT file systems.

This chapter contains the following sections: