Skip to main content
  • 产品
  • Evaluate our Software
  • 下载
  • Free Utilities
  • 购买
  • 支持
  • 关于我们
  • Search
    • Contact Us
    • Forum
    • Knowledge Base
    • Newsletter
    • RSS
  •   工作机会
  •   视频
  •   永续性
  • emFile
  • Software Structure
  • Technology
  • Add-ons
  • Tools

Software structure

emFile is organized in separate layers for maximum configuration flexibility. The layers have clear and simple interfaces that allow easy extending of the file system functionality.

Contact us
Downloads
Documentation
SEGGER emFile
emFile structure

How emFile is organized

API Layer

The API Layer is the interface between emFile and the user application. It is subdivided in two parts, Storage API and File System API. The File System API contains file functions in ANSI C stdio style, such as FS_FOpen(), FS_FWrite() etc. The API Layer transfers these calls to the File System Layer. Currently the FAT file system or an optional file system, called EFS, are available for emFile. Right now they cannot be used simultaneously. The Storage API contains the functions which are required to initialize and access a storage medium. The Storage API allows sector read and write operations. The API Layer transfers these calls to the Storage Layer. The Storage API is optimized for applications which do not require file system functionality like file and directory handling. A typical application which uses the Storage API could be a USB mass storage device, where data has to be stored on a medium, but all file system functionality is handled by the host PC.

File System Layer

The file system layer translates file operations to logical block (sector) operations. After such a translation, the file system calls the logical block layer and specifies the corresponding device driver for a device.

Storage Layer

The main purpose of the Storage Layer is to synchronize accesses to a device driver. It furthermore provides a simple interface for the File System API. The Storage Layer calls a device driver to perform a block operation. It also contains the cache mechanism.

Device Layer

Device drivers are low-level routines that are used to access sectors of the device and to check status. It is hardware independent but depends on the storage medium. A device driver consists of basic I/O functions for accessing the hardware and a global table that holds pointers to these functions.

Hardware Layer

These are the low level routines to access your hardware. These routines simply read and store fixed length sectors. The structure of the device driver is simple in order to allow easy integration of your own hardware.

全球总部

德国: SEGGER Microcontroller GmbH

地址: Ecolab-Allee 5
40789 Monheim am Rhein, Germany
电邮: info@segger.com
电话: +49-2173-99312-0
传真: +49-2173-99312-28

网点分布

中国:哲戈微系统科技(上海)有限公司

地址: 中国上海市闵行区秀涟路133号
大虹桥国际A 栋218室
邮编201199
电邮: china@segger.com
电话: +86-133-619-907-60

通过ISO 9001认证

ISO 9001

30多年的嵌入式行业经验

First-class embedded software tools since 1992
  • 版本说明
  • 免责声明
  • 隐私策略
  • 沪ICP备2022005181号
  • 沪公网安备 31011202014525号
© 2025 SEGGER - 版权所有.

您即将离开 segger.cn 而访问境外网站,是否继续?