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Technical Support
On-Line Manuals
RL-ARM User's Guide (MDK v4)
RL-RTX
RL-FlashFS
Technical Data
NAND Flash Translation Layer
Embedded File System
Memory Organization
Allocation Information
File Data Fragments
Limitations
Configuring RL-FlashFS
Source Files
Configuration Options
File System
Flash Drive
SPI Flash Drive
RAM Drive
Memory Card Drive
USB Flash Drive
NAND Flash Drive
Using RL-FlashFS
Using Flash Devices
Flash Driver
Sector Layout
Converting FlashPrg.c
Converting FlashDev.c
Limitations When Using Internal Flash
Using SPI Flash Devices
SPI Flash Driver
SPI Sector Layout
Using RAM Devices
Using Memory Card Devices
MCI Driver
SPI Driver
Using FlashFS with USB Devices
FAT Driver
Using NAND Devices
NAND Driver
NAND Page Data Layout
Function Overview
File I/O Routines
File Maintenance Routines
File Time Support Routines
Flash Driver Routines
FAT Driver Routines
MCI Driver Routines
SPI Driver Routines
NAND Driver Routines
IOC Interface Routines
System Routines
RL-TCPnet
RL-CAN
RL-USB
Example Programs
Library Reference
Appendix
File Data Fragments
File Data Fragments are of variable size and are fully defined through the file allocation information record.
To make optimum use of the Flash Block, create big file fragments to reduce the total number of file fragments. It is not optimal to open a file for appending or writing a byte to it and close the file. This approach creates huge file allocation information records, which consumes 12 bytes of Flash in total; 8 bytes for the file allocation information and 4 bytes for the information. In addition, such an approach creates slow access times to files.
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