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μC/FS Architecture
2-1-5 FILE SYSTEM DRIVER LAYER
The file system driver layer understands the organization of a particular file system type,
such as FAT. The current version of μC/FS only supports FAT file systems. fs_fat*.*
contains the file system driver which should be used for FAT12/FAT16/FAT32 disks with or
without Long File Name (LFN) support.
2-1-6 DEVICE DRIVER LAYER
The device driver layer understands about types of file system media (SD/MMC card, NOR
flash, etc.). In order for the device drivers to be independent of your CPU, we use additional
files to encapsulate such details as the access of registers, reading and writing to a data bus
and setting clock rates.
Each device driver is named according to the pattern
fs_dev_<dev drv name>.c
where <dev drv name> is the an identifier for the device driver. For example, the driver for
SD/MMC cards using SPI mode is called fs_dev_sd_spi.c . Most device drivers require a
BSP layer, with code for accessing registers, reading from or writing to a data bus, etc. This
file is named according to the pattern
fs_dev_<dev drv name>_bsp.c
For example, fs_dev_sd_spi_bsp.c contains the BSP functions for the driver SD/MMC
cards using SPI mode.
2-1-7 CPU LAYER
μC/FS can work with either an 8, 16, 32 or even 64-bit CPU, but needs to have information
about the CPU you are using. The CPU layer defines such things as the C data type
corresponding to 16-bit and 32-bit variables, whether the CPU is little- or big-endian and,
how interrupts are disabled and enabled on the CPU, etc.
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