STM32F7xx —— FatFS（W25QXX）
看本章之前请务必先食用：动态内存管理 W25QXX读写
使用经典的fatfs1.4.1，下载源码，和我们用户相关的式diskio.c，实现里面的初始化读写和ioctl。ffconf.h用来配置，很容易看懂，不再细说了。后面写了一个测试例子，能读写成功就说明没问题了。Fatfs对文件的操作与Linux文件操作基本类似，会使用就行，想弄清楚实现要深入学习fatfs的文件结构。
/*-----------------------------------------------------------------------*/
/* Low level disk I/O module skeleton for FatFs (C)ChaN, 2016 */
/*-----------------------------------------------------------------------*/
/* If a working storage control module is available, it should be */
/* attached to the FatFs via a glue function rather than modifying it. */
/* This is an example of glue functions to attach various exsisting */
/* storage control modules to the FatFs module with a defined API. */
/*-----------------------------------------------------------------------*/
#include "diskio.h" /* FatFs lower layer API */
#include "global.h"// 前24M字节给fatfs用 剩余部分,给自己用
#define FLASH_SECTOR_SIZE 512
#define FLASH_SECTOR_COUNT 1024*25*2 // W25Q256,前25M字节给FATFS占用
#define FLASH_BLOCK_SIZE 8 // 每个BLOCK有8个扇区 // 获得磁盘状态
DSTATUS disk_status(BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{return RES_OK;
}//初始化磁盘
DSTATUS disk_initialize(BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{W25QXXInit();return 0;
}// 读扇区
// pdrv:磁盘编号0~9
DRESULT disk_read(BYTE pdrv, /* Physical drive nmuber to identify the drive */BYTE *buff, /* Data buffer to store read data */DWORD sector, /* Sector address in LBA */UINT count /* Number of sectors to read */
)
{if(!count){return RES_PARERR;}for(; count > 0; count--){W25QXXRead(sector * FLASH_SECTOR_SIZE, buff, FLASH_SECTOR_SIZE);sector++;buff += FLASH_SECTOR_SIZE;}return RES_OK;
}// 写扇区
// pdrv:磁盘编号0~9
// *buff:发送数据首地址
// sector:扇区地址
// count:需要写入的扇区数
DRESULT disk_write(BYTE pdrv, /* Physical drive nmuber to identify the drive */const BYTE *buff, /* Data to be written */DWORD sector, /* Sector address in LBA */UINT count /* Number of sectors to write */
)
{if(!count){return RES_PARERR; // count不能等于0，否则返回参数错误}for(; count > 0; count--){W25QXXWrite(sector * FLASH_SECTOR_SIZE, (uint8_t *)buff, FLASH_SECTOR_SIZE);sector++;buff += FLASH_SECTOR_SIZE;}return RES_OK;
}// 其他表参数的获得
// pdrv:磁盘编号0~9
// ctrl:控制代码
// *buff:发送/接收缓冲区指针
DRESULT disk_ioctl(BYTE pdrv, /* Physical drive nmuber (0..) */BYTE cmd, /* Control code */void *buff /* Buffer to send/receive control data */
)
{DRESULT res;switch(cmd){case CTRL_SYNC:res = RES_OK;break;case GET_SECTOR_SIZE:*(WORD*)buff = FLASH_SECTOR_SIZE;res = RES_OK;break;case GET_BLOCK_SIZE:*(WORD*)buff = FLASH_BLOCK_SIZE;res = RES_OK;break;case GET_SECTOR_COUNT:*(DWORD*)buff = FLASH_SECTOR_COUNT;res = RES_OK;break;default:res = RES_PARERR;break;}return res;
}// 获得时间
// User defined function to give a current time to fatfs module */
// 31-25: Year(0-127 org.1980), 24-21: Month(1-12), 20-16: Day(1-31) */
// 15-11: Hour(0-23), 10-5: Minute(0-59), 4-0: Second(0-29 *2) */
DWORD get_fattime(void)
{return 0;
}// 动态分配内存
void *ff_memalloc(UINT size)
{return (void *)MemAlloc(SRAM_TYPE_IN, size);
}// 释放内存
void ff_memfree(void *mf)
{MemFree(SRAM_TYPE_IN, mf);
}/*---------------------------------------------------------------------------/
/ FatFs - FAT file system module configuration file R0.12 (C)ChaN, 2016
/---------------------------------------------------------------------------*/#define _FFCONF 88100 /* Revision ID *//*---------------------------------------------------------------------------/
/ Function Configurations
/---------------------------------------------------------------------------*/#define _FS_READONLY 0
/* This option switches read-only configuration. (0:Read/Write or 1:Read-only)
/ Read-only configuration removes writing API functions, f_write(), f_sync(),
/ f_unlink(), f_mkdir(), f_chmod(), f_rename(), f_truncate(), f_getfree()
/ and optional writing functions as well. */#define _FS_MINIMIZE 0
/* This option defines minimization level to remove some basic API functions.
/
/ 0: All basic functions are enabled.
/ 1: f_stat(), f_getfree(), f_unlink(), f_mkdir(), f_truncate() and f_rename()
/ are removed.
/ 2: f_opendir(), f_readdir() and f_closedir() are removed in addition to 1.
/ 3: f_lseek() function is removed in addition to 2. */#define _USE_STRFUNC 1
/* This option switches string functions, f_gets(), f_putc(), f_puts() and
/ f_printf().
/
/ 0: Disable string functions.
/ 1: Enable without LF-CRLF conversion.
/ 2: Enable with LF-CRLF conversion. */#define _USE_FIND 0
/* This option switches filtered directory read functions, f_findfirst() and
/ f_findnext(). (0:Disable, 1:Enable 2:Enable with matching altname[] too) */#define _USE_MKFS 1
/* This option switches f_mkfs() function. (0:Disable or 1:Enable) */#define _USE_FASTSEEK 1
/* This option switches fast seek function. (0:Disable or 1:Enable) */#define _USE_EXPAND 0
/* This option switches f_expand function. (0:Disable or 1:Enable) */#define _USE_CHMOD 0
/* This option switches attribute manipulation functions, f_chmod() and f_utime().
/ (0:Disable or 1:Enable) Also _FS_READONLY needs to be 0 to enable this option. */#define _USE_LABEL 1
/* This option switches volume label functions, f_getlabel() and f_setlabel().
/ (0:Disable or 1:Enable) */#define _USE_FORWARD 0
/* This option switches f_forward() function. (0:Disable or 1:Enable)
/ To enable it, also _FS_TINY need to be 1. *//*---------------------------------------------------------------------------/
/ Locale and Namespace Configurations
/---------------------------------------------------------------------------*/#define _CODE_PAGE 936 //采用中文GBK编码
/* This option specifies the OEM code page to be used on the target system.
/ Incorrect setting of the code page can cause a file open failure.
/
/ 1 - ASCII (No extended character. Non-LFN cfg. only)
/ 437 - U.S.
/ 720 - Arabic
/ 737 - Greek
/ 771 - KBL
/ 775 - Baltic
/ 850 - Latin 1
/ 852 - Latin 2
/ 855 - Cyrillic
/ 857 - Turkish
/ 860 - Portuguese
/ 861 - Icelandic
/ 862 - Hebrew
/ 863 - Canadian French
/ 864 - Arabic
/ 865 - Nordic
/ 866 - Russian
/ 869 - Greek 2
/ 932 - Japanese (DBCS)
/ 936 - Simplified Chinese (DBCS)
/ 949 - Korean (DBCS)
/ 950 - Traditional Chinese (DBCS)
*/#define _USE_LFN 3
#define _MAX_LFN 255
/* The _USE_LFN switches the support of long file name (LFN).
/
/ 0: Disable support of LFN. _MAX_LFN has no effect.
/ 1: Enable LFN with static working buffer on the BSS. Always NOT thread-safe.
/ 2: Enable LFN with dynamic working buffer on the STACK.
/ 3: Enable LFN with dynamic working buffer on the HEAP.
/
/ To enable the LFN, Unicode handling functions (option/unicode.c) must be added
/ to the project. The working buffer occupies (_MAX_LFN + 1) * 2 bytes and
/ additional 608 bytes at exFAT enabled. _MAX_LFN can be in range from 12 to 255.
/ It should be set 255 to support full featured LFN operations.
/ When use stack for the working buffer, take care on stack overflow. When use heap
/ memory for the working buffer, memory management functions, ff_memalloc() and
/ ff_memfree(), must be added to the project. */#define _LFN_UNICODE 0
/* This option switches character encoding on the API. (0:ANSI/OEM or 1:Unicode)
/ To use Unicode string for the path name, enable LFN and set _LFN_UNICODE = 1.
/ This option also affects behavior of string I/O functions. */#define _STRF_ENCODE 0
/* When _LFN_UNICODE == 1, this option selects the character encoding on the file to
/ be read/written via string I/O functions, f_gets(), f_putc(), f_puts and f_printf().
/
/ 0: ANSI/OEM
/ 1: UTF-16LE
/ 2: UTF-16BE
/ 3: UTF-8
/
/ This option has no effect when _LFN_UNICODE == 0. */#define _FS_RPATH 0
/* This option configures support of relative path.
/
/ 0: Disable relative path and remove related functions.
/ 1: Enable relative path. f_chdir() and f_chdrive() are available.
/ 2: f_getcwd() function is available in addition to 1.
*//*---------------------------------------------------------------------------/
/ Drive/Volume Configurations
/---------------------------------------------------------------------------*/#define _VOLUMES 3 //支持3个磁盘
/* Number of volumes (logical drives) to be used. */#define _STR_VOLUME_ID 0
#define _VOLUME_STRS "RAM","NAND","CF","SD1","SD2","USB1","USB2","USB3"
/* _STR_VOLUME_ID switches string support of volume ID.
/ When _STR_VOLUME_ID is set to 1, also pre-defined strings can be used as drive
/ number in the path name. _VOLUME_STRS defines the drive ID strings for each
/ logical drives. Number of items must be equal to _VOLUMES. Valid characters for
/ the drive ID strings are: A-Z and 0-9. */#define _MULTI_PARTITION 0
/* This option switches support of multi-partition on a physical drive.
/ By default (0), each logical drive number is bound to the same physical drive
/ number and only an FAT volume found on the physical drive will be mounted.
/ When multi-partition is enabled (1), each logical drive number can be bound to
/ arbitrary physical drive and partition listed in the VolToPart[]. Also f_fdisk()
/ funciton will be available. */#define _MIN_SS 512
#define _MAX_SS 512
/* These options configure the range of sector size to be supported. (512, 1024,
/ 2048 or 4096) Always set both 512 for most systems, all type of memory cards and
/ harddisk. But a larger value may be required for on-board flash memory and some
/ type of optical media. When _MAX_SS is larger than _MIN_SS, FatFs is configured
/ to variable sector size and GET_SECTOR_SIZE command must be implemented to the
/ disk_ioctl() function. */#define _USE_TRIM 0
/* This option switches support of ATA-TRIM. (0:Disable or 1:Enable)
/ To enable Trim function, also CTRL_TRIM command should be implemented to the
/ disk_ioctl() function. */#define _FS_NOFSINFO 0
/* If you need to know correct free space on the FAT32 volume, set bit 0 of this
/ option, and f_getfree() function at first time after volume mount will force
/ a full FAT scan. Bit 1 controls the use of last allocated cluster number.
/
/ bit0=0: Use free cluster count in the FSINFO if available.
/ bit0=1: Do not trust free cluster count in the FSINFO.
/ bit1=0: Use last allocated cluster number in the FSINFO if available.
/ bit1=1: Do not trust last allocated cluster number in the FSINFO.
*//*---------------------------------------------------------------------------/
/ System Configurations
/---------------------------------------------------------------------------*/#define _FS_TINY 0
/* This option switches tiny buffer configuration. (0:Normal or 1:Tiny)
/ At the tiny configuration, size of the file object (FIL) is reduced _MAX_SS bytes.
/ Instead of private sector buffer eliminated from the file object, common sector
/ buffer in the file system object (FATFS) is used for the file data transfer. */#define _FS_EXFAT 1
/* This option switches support of exFAT file system in addition to the traditional
/ FAT file system. (0:Disable or 1:Enable) To enable exFAT, also LFN must be enabled.
/ Note that enabling exFAT discards C89 compatibility. */#define _FS_NORTC 0
#define _NORTC_MON 3
#define _NORTC_MDAY 1
#define _NORTC_YEAR 2016
/* The option _FS_NORTC switches timestamp functiton. If the system does not have
/ any RTC function or valid timestamp is not needed, set _FS_NORTC = 1 to disable
/ the timestamp function. All objects modified by FatFs will have a fixed timestamp
/ defined by _NORTC_MON, _NORTC_MDAY and _NORTC_YEAR in local time.
/ To enable timestamp function (_FS_NORTC = 0), get_fattime() function need to be
/ added to the project to get current time form real-time clock. _NORTC_MON,
/ _NORTC_MDAY and _NORTC_YEAR have no effect.
/ These options have no effect at read-only configuration (_FS_READONLY = 1). */#define _FS_LOCK 0
/* The option _FS_LOCK switches file lock function to control duplicated file open
/ and illegal operation to open objects. This option must be 0 when _FS_READONLY
/ is 1.
/
/ 0: Disable file lock function. To avoid volume corruption, application program
/ should avoid illegal open, remove and rename to the open objects.
/ >0: Enable file lock function. The value defines how many files/sub-directories
/ can be opened simultaneously under file lock control. Note that the file
/ lock control is independent of re-entrancy. */#define _FS_REENTRANT 0
#define _FS_TIMEOUT 1000
#define _SYNC_t HANDLE
/* The option _FS_REENTRANT switches the re-entrancy (thread safe) of the FatFs
/ module itself. Note that regardless of this option, file access to different
/ volume is always re-entrant and volume control functions, f_mount(), f_mkfs()
/ and f_fdisk() function, are always not re-entrant. Only file/directory access
/ to the same volume is under control of this function.
/
/ 0: Disable re-entrancy. _FS_TIMEOUT and _SYNC_t have no effect.
/ 1: Enable re-entrancy. Also user provided synchronization handlers,
/ ff_req_grant(), ff_rel_grant(), ff_del_syncobj() and ff_cre_syncobj()
/ function, must be added to the project. Samples are available in
/ option/syscall.c.
/
/ The _FS_TIMEOUT defines timeout period in unit of time tick.
/ The _SYNC_t defines O/S dependent sync object type. e.g. HANDLE, ID, OS_EVENT*,
/ SemaphoreHandle_t and etc.. A header file for O/S definitions needs to be
/ included somewhere in the scope of ff.c. *//*--- End of configuration options ---*/
#if (CONFIG_FATFS_TEST == 1)
static uint8_t vbuffer[100] = {0};
static void fatfs_test(void)
{uint8_t res;FATFS *fat = (FATFS *)MemAlloc(SRAM_TYPE_IN, sizeof(FATFS));FIL *fs = (FIL *)MemAlloc(SRAM_TYPE_IN, sizeof(FIL));UINT rw;uint8_t *buffer = (uint8_t *)MemAlloc(SRAM_TYPE_IN, 512), i;WarpInit();res = f_mount(fat, "1:", 1);if(res == 0x0D){printf("Fmount 0x0D....\r\n");res = f_mkfs("1:", 1, 4096);if(res != 0){printf("f_mkfs fail....\r\n");}}res = f_open(fs, "1:MMMM.txt", FA_OPEN_ALWAYS | FA_WRITE | FA_READ);if(res != FR_OK){printf("mf_open fail...\r\n");}f_write(fs, "bbbbbbAAAAbbb", strlen("bbbbbbAAAAbbb"));f_close(fs);res = f_open(fs, "1:MMMM.txt", FA_READ);if(res != FR_OK){printf("mf_open fail...\r\n");}f_read(fs, buffer, strlen("bbbbbbAAAAbbb"));memcpy(vbuffer, buffer, strlen("bbbbbbAAAAbbb"));printf("vffer: %s\r\n", vbuffer);f_close(fs);
}
#endif上面的例子是直接使用了ff.h中的函数，我们也可以创建一个文件，使用包裹函数封装ff.h中的函数，我们只使用包裹函数中的函数。
