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File System
A complete file system software stack providing support for
a variety of media through a uniform, easy-to-use programming interface.
Allows for interoperability, fail-safety and high performance, all at once.
Features
Interoperable: µC/OS-FS implements the ubiquitous FAT12/16/32 file system allowing for unrivaled data sharing possibilities. Includes long file name support as well as UTF-8 character encoding.
Reliable: Micrium's journaling module guarantees that the file system internal state will remain consistent in the case of untimely power failures.
Low footprint: with a minimal requirement of one buffer, µC/OS-FS can run with as little as 1kB of available RAM.
Flash memory support: µC/OS-FS provides support for NOR and NAND flash memory through a highly configurable Flash Translation Layer (FTL). In addition to providing a uniform block device abstraction on top of heterogeneous flash technologies, the FTL optimizes flash memory lifetime thanks to its built-in wear leveling mechanisms.
Removable media support: Removable media support: µC/OS-FS provides support for SD cards, Multimedia Memory Cards (MMC) and MSC devices, including asynchronous insertion / removal notification to the application and stale files access protection.
Performance: µC/OS-FS offers high performance without sacrificing reliability. This is thanks to a sophisticated write-back caching mechanism that is journaling-compatible. Moreover, its advanced locking scheme ensures thread safety while allowing a high degree of concurrency.
Easy to use: µC/OS-FS offers unprecedented ease of use through both its native and POSIX compliant APIs.
Customizable: The memory footprint (both RAM and ROM) of μC/OS-FS can be adjusted at compile time based on the required features
Specifications
Memory Footprint
| ROM | Minimal (block device only): 7kB Typical: 65kB |
| RAM | Minimal (bare-metal, file API and SD driver): 1kB Typical: 5kB(bytes) |
Key Specifications
| Memory allocation | Static and dynamic mode supported |
| File operations | Read, write, truncate, rename, copy, query |
| POSIX compliant | Yes |
| File buffers supported | Yes |
| Supported file systems | FAT12/16/32 |
| Raw block device interface | Yes |
| Concurrency | Preemptive file read operations
Preemptive file write operations on different volumes |
| Fail safe | Yes (with optional journaling module) |
| Write back caching | Yes (can be used along with journaling) |
| Partition support | Yes (DOS-style partitions) |
| Unicode support | Yes |
| Storage media technology support | NAND, NOR, SD (card mode + SPI), SCSI, RAM |
| Bare metal support | Yes |
Storage Device Support
| SD/MMC | SD, SDHC and SDXC cards, as well as MMC cards and e-MMC chips. Card mode and SPI implementations are available. SD Specification v2.00 or later supported. |
| NAND | SLC and MLC memories with a parallel bus. Both small page and large page devices are supported. Fast ECC (error correction codes) are provided for 1-bit correction per codeword using Hamming codes. Hardware ECC is supported (either on the memory device or as a CPU peripheral). |
| NOR | Support for a wide variety of serial (both SPI and QuadSPI) and parallel NOR. |
| MSC | All MSC compatible USB drives. |
Licensing
Licensing Packages That Meet Your Needs
Micrium embedded components are priced as individual modules or as bundled solutions. Check out our licensing page for more information.
Documentation
Micrium's user documentation is available online on the Micrium documentation site.
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