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RL-ARM User's Guide
RL-RTX RL-FlashFS Flash Memory Management
Memory Organization File Allocation Information File Data Blocks Technical Data Configuring Flash File System Configuration Flash Device Sector Memory Map FS_FlashDev.h Converting FlashDev.c Program and Erase Code FS_FlashPrg.c Converting FlashPrg.c SPI Flash Device FS_SPI_FlashDev.h Programming Code FS_SPI_FlashPrg.c RAM Device Memory Card Device MCI Interface SPI Interface File Time Support System Configuration Library Files Using Flash File System Using Flash Devices Using Dedicated Flash Devices Using One Large Flash Device Using Internal Flash Devices Using RAM Devices RAM Configuration Example Using Memory Card Devices Hot Insertion Debugging Function Overview File I/O Routines File Maintenance Routines File Time Support Routines Low-Level Routines SPI Interface Routines System Functions RL-TCPnet RL-CAN Example Programs Library Reference AppendixRL-FlashFS
RL-Flash File System (RL-FlashFS) is a flash based file system which allows you to create, save, read and modify files stored on the flash device. Creating applications based on RL-FlashFS makes this task easier for you since the Flash file system library functions handle the low level file input and output operations.
The file is a stream of data in binary, ascii or any other format, which is permanently stored in the flash device and may be retrieved at any time, if required. The files are stored in an externally attached big flash device or an SD memory device.
RL-FlashFS supports huge Flash sizes where Flash ROM's typically have several 64KB pages. The RL-FlashFS library provides you with standard high level file interface functions. RL-FlashFS is a powerful file system that is both easy to use and works with all ARM® derivatives.
With the Flash File System you can also write and read files from standard SD (Secure Digital) and MMC (Multi Media Card) Flash Memory Cards. They are used in SPI mode. Standard device sizes ranging from a few MBytes up to 4 GBytes are supported. Files on the Memory Card drive are stored in the standard FAT12, FAT16 or FAT32 file format.
RL-FlashFS applications are written using standard C constructs and are compiled with the ARM RealView® Compiler. RL-FlashFS programs only require that you include a special header file and link the RL-FlashFS library to your program.
Note
- RL-FlashFS is not included with the RealView MDK-ARM™ Microcontroller Development Kit. It is available in the stand-alone product RL-ARM™, which also contains the RTX kernel (source code included), TCP/IP Stack, CAN, and USB drivers.
- The Flash File System is a low level implementation tailored to specific targets such as embedded flash devices, SRAM devices, and SD Card devices. The File IO functions provided in the RealView MDK-ARM standard library is a high level file IO implementation.
- The Flash File System can not be used with a MicroLIB runtime library. The MicroLIB does not implement stdlib.h library functions.
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