2020年12月17日 | STM32F7xx —— FatFS（W25QXX）

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"