CMX-FFS-TINY is a full-featured flash file system targeted at embedded
devices with limited resources available to them and a requirement to
reliably store and retrieve data from Flash devices including ST Serial,
Small Sector Byte Writable, SST and DataFlash.
Flash devices are inherently complex and every flash type has different
characteristics. Each flash type is analyzed and a specific version of
CMX-FFS-TINY is designed. The result is that the features of a particular
device are hidden from the developer. Data can be stored position
independently without having to worry about partial writes, partial erases,
cumulative erase times and other flash details.
CMX-FFS-TINY opens up new possibilities for developers delivering
reliable storage on the smallest devices without having to be flash or file
Typical usage includes:
- Configuration Files
- Product Customization Files
- Diagnostic Storage
- Data Logging
- Standard File API (fopen(), fread() etc.)
- Long Filenames
- Highly Scalable
- Minimal Footprint
- RAM usage <200 Bytes
- ROM usage 4-10K
- Multiple Flash Types
- Multiple Simultaneous Files Open
- RTOS Independent
- Royalty Free Source
- Comprehensive Programmer's Guide
Target Specific Packages
The CMX-FFS-TINY file system options include:
CMX-FFS-TINY-DF for Atmel DataFlash
CMX-FFS-TINY-ST for ST Serial Flash devices
CMX-FFS-TINY-BW for Small Sector Byte Writable and SST Flash
CMX-FFS-TINY-RAM for use as a RAM drive
Fail-Safe File System
CMX-FFS-TINY has been designed from conception as a completely fail-safe
file system. This means that if an unexpected reset or system failure
occurs then regardless of what operation was in progress the file system
will restart cleanly with no recovery procedure. Any open file that has
not been closed will be available in its pre-open state. Any closed file
will be available in its new state.
DataFlash Management Layer
CMX-FFS-TINY-DF includes a unique DataFlash Management Layer (DFML). The
DFML has been specifically developed to enable all Atmel's DataFlash devices
to be used in a reliable and failsafe way. For more detailed information
please consult the CMX-FFS-TINY-DFML datasheet.
CMX-FFS-TINY has been tested on many Atmel DataFlash devices, ST Serial
Flash devices and other Small Sector Byte Writeable Flash devices.
Please contact CMX for specific devices supported.
CMX-FFS-TINY has been developed and tested on a range of 8, 16 and 32 bit
MicroControllers. It has also been compiled with multiple tool chains to
ensure ease of portability. CMX-FFS-TINY should be able to run on any
system with >10k bytes ROM, >0.5K bytes RAM.
Application Programmer's Interface
A standard file API is provided with standard call parameters. These
routines allow easy initialization and management of files, directories
with complete wild card support. Applications written for other platforms
can work without modification with CMX-FFS-TINY.
The complete list of API functions is provided below.