FATFS is a universal file system module with a small embedded system's FAT file system. The ANSI C format syntax standard is complied with FATFS, so it is a hardware architecture. Do not do any changes can be ported to a commonly used microcontroller, such as 8051, PIC, AVR, SH, Z80, H8, ARM, and the like.
FATFS features
Separate the buffered FAT structure and each file, suitable for quick access multiple files.
Support multiple drives and partitions.
Supports FAT12, FAT16, and FAT32.
Support for 8.3 format file name (LFN does not support)
Support two partition rules: fdisk and super floppy disk.
Optimize the 8/16-bit microcontroller.
Application interface
The FATFS / mini FATFS module provides the following functions.
F_mount - Register or log out of a work area
F_Open - Open or create a file
f_close - Close a file
f_read - read file
f_write - write files
F_Lseek - Mobile File Read / Write Pointer
f_truncate - cut off file
F_Sync - Detachment of Cache
F_OpendIr - Open a directory
f_readdir - Read Directory Project
f_getfree - get a free cluster
f_stat - Get file status
f_mkdir - Create a directory
F_unlink - Delete files or directories
f_chmod - Change Properties
f_utime - Change Time Stamp
F_rename - Rename / Move file or directory
F_mkfs - Create a drive of a file system
f_forward - Forwarding the file data stream directly
FGETS - read a string
FPUTC - write a character
FPUTS - write a string
FPRINTF - write formatted strings
Disk I / O Interface
Disk_initialize - Initialized Disk Drive
Disk_status - get disk status
Disk_read - Reading Department (Sunday)
Disk_write - Remissions (Sunday)
Disk_iocTl - Control Device Dependency
GET_FATTIME - Gets the current time
File system for easy porting and use FATFS MOULE
Speech
With the development of information technology, the amount of information in today's society is increasing, and the system is simply transmitted by the single-chip microcomputer system, and it is not satisfied with the needs of people's practical applications. The system is managed by the storage medium into a development direction of future microcontroller systems. The currently common file system mainly has Microsoft's FATL2, FATL6, FAT32, NTFS, and EXT2, EXT3, etc. under Linux systems. Due to the wide application of Microsoft Windows, in the current consumer electronics, the most use of the FAT file system, such as the U disk, MP3, MP4, digital cameras, etc., so finding a easy porting and use, occupying hardware resources Smaller and powerful FAT open source file systems are important for single-chip system designers.
Fatfs Module is a completely free open source FAT file system module designed for small embedded systems. It is completely written in standard C language, so it has a good hardware platform independence, which can be ported to 8051, PIC, AVR, SH, Z80, H8, ARM and other series of microcontrollers and simply modifications. It supports FATL2, FATL6, and FAT32, supports multiple storage media; there is a separate buffer, multiple files can be read / written, and 8-bit microcontrollers and 16-bit microcomputer are specifically optimized. Fatfs Module has a simplified version Tiny-Fatfs, which has two main points with the full version of FATFS:
1 Take up less memory, as long as 1 kb is;
Only one storage mesh is supported 21 times.
Like the usage of FATFS and TINY-FATFS, it is only convenient to include different header files. This article mainly introduces Tiny-Fatfs.
1 tiny-fatfs
1.1 Preparation before transplantation
FATFS MODULE is designed to be used on different microcontrollers, so there is a good hierarchy, as shown in Figure 1. The topmost is the application layer, the user does not need to pay the internal structure and complex FAT protocols of Fatfs Module, just call the FATFS Module to provide a series of application interface functions, such as f_open, f_read, f_write, f_close, etc., It is simple to read / write files on the PC.
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The intermediate layer FATFS MODULE implements the FAT file read / write protocol. Fatfs Module's full version is FF. C, FF. H, the simplified version of Tiny-FATFS is TFF. C, TFF. h. Unless it is necessary, users generally do not have to modify, and they will be directly included with the version of the header file.
Requires the user writes the transplant code is the underlying interface provided by the FATFS Module, which includes the storage medium read / write interface Diskio and the supply file to create a real-time clock. , Reading the full text, the technology area
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