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STM32 SD卡FATFS移植

发布人：0750long 时间：2010-02-11 来源：工程师

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最近试玩了STM32用SPI方式操作SD卡，这样就涉及到文件系统，搜索到几种支持FAT16/32的文件，综合考虑，最后选择了完全开源、免费的FATFS，版本是R0.07e，该版本支持长文件名：

Windows compatible FAT12/16/32 file system.
Platform independent. Easy to port.
Very small footprint for code and work area.
Various configuration options:
- Multiple volumes (physical drives and partitions).
- Multiple OEM code pages including DBCS.
- Long file name (LFN) support in OEM code or Unicode.
- RTOS support.
- Multiple sector size support.
- Read-only, minimized API, I/O buffer and etc...

官网地址：http://elm-chan.org
下载地址：http://elm-chan.org/fsw/ff/ff007e.zip
本地下载：FATFS R007e

(786.01 K) 该附件被下载次数 99

感受就是FATFS十分容易移植，同时对资源不是要求很高，网上对FATFS的移植也比较多。
要点是：
1：SD底层驱动
2：Disk I/O Interface
Since the FatFs module is completely separated from disk I/O layer, it requires following functions to lower layer to read/write the physical disk and to get current time. The low level disk I/O module is not a part of FatFs module so that it must be provided by user. The sample drivers are also available in the resources.

disk_initialize - Initialize disk drive
disk_status - Get disk status
disk_read - Read sector(s)
disk_write - Write sector(s)
disk_ioctl - Control device dependent features
get_fattime - Get current time

以下是512M SD1.0卡和4G SDHC卡的测试结果：
**************************************************
Card Type                     : SD V1
File System Sub Type          : FAT16
Total space (Bytes)           : 511574016
Available space (Bytes)       : 511369216
Physical drive number         : 0
Maximum cluster               : 62450
Number of free clusters       : 62423
Last allocated cluster        : 0
Maximum sector size           : 512
Number of sectors per cluster : 16
Number of FAT copies          : 2
Sectors per fat               : 244
File system info sector       : 0
Root directory start sector   : 729
FAT start sector              : 241
Data start sector             : 761
**************************************************
Write File Successed: 0:CardInfo.txt, 64:64
Write File Successed: 0:ffext2.ini, 13312:13312
Read File Successed: 0:ffext2.ini, 13312:13312
Write File Successed: 0:ffext1.txt, 13312:13312

**************************************************
Card Type                     : SD V2HC
File System Sub Type          : FAT32
Total space (Bytes)           : 3949592576
Available space (Bytes)       : 3949588480
Physical drive number         : 0
Maximum cluster               : 964258
Number of free clusters       : 964255
Last allocated cluster        : 3
Maximum sector size           : 512
Number of sectors per cluster : 8
Number of FAT copies          : 2
Sectors per fat               : 7534
File system info sector       : 1
Root directory start sector   : 2
FAT start sector              : 36
Data start sector             : 15104
**************************************************
Write File Successed: 0:CardInfo.txt, 64:64
Write File Successed: 0:ffext2.ini, 13312:13312
Read File Successed: 0:ffext2.ini, 13312:13312
Write File Successed: 0:ffext1.txt, 13312:13312

以下是移植文件：

(601.38 K) 该附件被下载次数 126