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μC/FS Architecture
2-1 ARCHITECTURE COMPONENTS
μC/FS consists of a set of modular software components. It also requires a few external
components (provided with the release) be compiled into the application and a few
configuration and BSP files be adapted to the application.
2-1-1 YOUR APPLICATION
Your application needs to provide configuration information to μC/FS in the form of one C
header file named fs_cfg.h .
Some of the configuration data in fs_cfg.h consist of specifying whether certain features
will be present. For example, LFN support, volume cache and file buffering are all enabled
or disabled in this file. In all, there are about 30 #define to set. However, most of these can
be set to their default values.
2-1-2 LIB (LIBRARIES)
Because μC/FS is designed to be used in safety critical applications, all ‘standard’ library
functions like strcpy() , memset() , etc., have been re-written to follow the same quality as
the rest of the file system software.
2-1-3 POSIX API LAYER
Your application interfaces to μC/FS using the well-known stdio.h API (Application
Programming Interface). Alternately, you can use μC/FS’s own file and directory interface
functions. Basically, POSIX API layer is a layer of software that converts POSIX file access
calls to μC/FS file access calls.
2-1-4 FS LAYER
This layer contains most of the CPU-, RTOS- and compiler-independent code for μC/FS.
There are three categories of files in this section:
1
File system object-specific files:
■
Devices ( fs_dev.* )
24
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