官网最新版本：http://elm-chan.org/fsw/ff/00index_e.html
一、下载最新版本
FATFA文件系统在这里不多做介绍了，只展示移植过程和使用方法（结尾有修改好的代码）
二、移植代码
1.解压文件
压缩包里面有两个文件：documents是一些帮助文档，不需要管；source里面是源码，把里面全部的文件复制添加到自己的工程；
2.添加工程
一般在自己的工程里面新建一个FATFS文件夹，把source里面的文件复制进来，然后添加到自己的工程里面，注意添加.c文件的时候把ffconf.h也添加进去，方便后面修改，.h文件也正常添加；
3.修改代码
需要我们修改的文件只有修fconf.h和diskio.c两个文件
注意：本次移植工程是以W25Q128为列的，W25Q128的代码在我之前的文章就有，都是免费的，直接复制粘贴修改引脚就可以使用的；虽然宏里面有SD卡，但是并未实现SD卡的功能，需要的话可以私信，有工程源码，当然也是免费的。
（1）打开diskio.c文件，从上到下依次进行：
（2）修改函数:
//查询当前驱动器状态
DSTATUS disk_status (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
DSTATUS stat;
// int result;
switch (pdrv) {
case SD_CARD :
return stat;
case SPI_FLASH :
if(W25QXX_ReadID()!=W25Q128) //#define W25Q128 0XEF17
{
stat = STA_NOINIT; //检测不到W25Q128
}else{
stat = 0; //初始化成功
}
return stat;
}
return STA_NOINIT;
}
/*-----------------------------------------------------------------------*/
/* Inidialize a Drive */
/*-----------------------------------------------------------------------*/
//磁盘初始化
DSTATUS disk_initialize (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
DSTATUS stat;
// int result;
switch (pdrv) {
case SD_CARD :
return stat;
case SPI_FLASH :
W25QXX_Init(); //此处就是对FLASH进行初始化，该函数需要返回初始化是否成功的标志位
return disk_status(SPI_FLASH);
}
return STA_NOINIT;
}
/*-----------------------------------------------------------------------*/
/* Read Sector(s) */
/*-----------------------------------------------------------------------*/
//从存储设备的扇区读取设备
DRESULT disk_read (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
BYTE *buff, /* Data buffer to store read data */
LBA_t sector, /* Start sector in LBA */
UINT count /* Number of sectors to read */
)
{
DRESULT res;
// int result;
switch (pdrv) {
case SD_CARD :
return res;
case SPI_FLASH :
W25QXX_Read(buff , sector*4096 , count*4096);//该函数没有返回值，所以默认返回正常;每个扇区的大小是4096，所以传给底层的起始地址就是sector*4096
//要读取多少个字节，就是读取的扇区个数count*4096
res = RES_OK;
return res;
}
return RES_PARERR;
}
/*-----------------------------------------------------------------------*/
/* Write Sector(s) */
/*-----------------------------------------------------------------------*/
//向存储设备的扇区写入数据
#if FF_FS_READONLY == 0
DRESULT disk_write (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
const BYTE *buff, /* Data to be written */
LBA_t sector, /* Start sector in LBA */
UINT count /* Number of sectors to write */
)
{
DRESULT res;
// int result;
switch (pdrv) {
case SD_CARD :
return res;
case SPI_FLASH :
W25QXX_Write((u8*)buff,sector*4096,count*4096); //buff是const BYTE类型，而传入下一层需要的是uint8_t类型，所以此处进行强制转化
res = RES_OK ;
return res;
}
return RES_PARERR;
}
#endif
/*-----------------------------------------------------------------------*/
/* Miscellaneous Functions */
/*-----------------------------------------------------------------------*/
//控制设备特定功能和通用的读/写以外的其他功能
DRESULT disk_ioctl (
BYTE pdrv, /* Physical drive nmuber (0..) */
BYTE cmd, /* Control code */
void *buff /* Buffer to send/receive control data */
)
{
DRESULT res;
// int result;
switch (pdrv) {
case SD_CARD :
return res;
case SPI_FLASH :
switch(cmd)
{
//返回扇区个数
case GET_SECTOR_COUNT:
*(DWORD *)buff = 16777216; //此次试验是w25q128，全部用于文件系统，共16MB字节，即16777216字节
break;
//返回扇区大小
case GET_SECTOR_SIZE:
*(WORD *)buff = 4096 ;
break;
//返回擦除扇区的最小个数
case GET_BLOCK_SIZE:
*(WORD *)buff = 1 ; //每次擦除一个扇区
break;
}
res = RES_OK; //由此看出，此处的数据返回值不是通过return返回的，如之前的讲解是通过指针返回
return res;
}
return RES_PARERR;
}
//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;
} 函数都有注释，不一个一个修改了，直接上修改后的源码。
（3）打开ffconf.c文件，一共需要修改四处，从上到下依次进行：
修改f_mkfs格式化需要的函数：
修改此宏，可以支持简体中文：
修改可以支持的设备数目：
此宏代表所挂设备中扇区最大值，如W25QXX扇区为4096，如果还是512，就会导致栈溢出；
FATFS文件系统到此就移植修改好了。
三、工程源码
修改好的diskio.c文件：
/*-----------------------------------------------------------------------*/
/* Low level disk I/O module SKELETON for FatFs (C)ChaN, 2019 */
/*-----------------------------------------------------------------------*/
/* 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 "ff.h" /* Obtains integer types */
#include "diskio.h" /* Declarations of disk functions */
#include "w25qxx.h"
/* Definitions of physical drive number for each drive */
//#define DEV_RAM 0 /* Example: Map Ramdisk to physical drive 0 */
//#define DEV_MMC 1 /* Example: Map MMC/SD card to physical drive 1 */
//#define DEV_USB 2 /* Example: Map USB MSD to physical drive 2 */
#define SD_CARD 0 //SD卡设备，0就是SD卡的设备编号
#define SPI_FLASH 1 //本次操作的w25qxx设备，1就是w25qxx的设备编号
/*-----------------------------------------------------------------------*/
/* Get Drive Status */
/*-----------------------------------------------------------------------*/
//查询当前驱动器状态
DSTATUS disk_status (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
DSTATUS stat;
// int result;
switch (pdrv) {
case SD_CARD :
return stat;
case SPI_FLASH :
if(W25QXX_ReadID()!=W25Q128) //#define W25Q128 0XEF17
{
stat = STA_NOINIT; //检测不到W25Q128
}else{
stat = 0; //初始化成功
}
return stat;
}
return STA_NOINIT;
}
/*-----------------------------------------------------------------------*/
/* Inidialize a Drive */
/*-----------------------------------------------------------------------*/
//磁盘初始化
DSTATUS disk_initialize (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
DSTATUS stat;
// int result;
switch (pdrv) {
case SD_CARD :
return stat;
case SPI_FLASH :
W25QXX_Init(); //此处就是对FLASH进行初始化，该函数需要返回初始化是否成功的标志位
return disk_status(SPI_FLASH);
}
return STA_NOINIT;
}
/*-----------------------------------------------------------------------*/
/* Read Sector(s) */
/*-----------------------------------------------------------------------*/
//从存储设备的扇区读取设备
DRESULT disk_read (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
BYTE *buff, /* Data buffer to store read data */
LBA_t sector, /* Start sector in LBA */
UINT count /* Number of sectors to read */
)
{
DRESULT res;
// int result;
switch (pdrv) {
case SD_CARD :
return res;
case SPI_FLASH :
W25QXX_Read(buff , sector*4096 , count*4096);//该函数没有返回值，所以默认返回正常;每个扇区的大小是4096，所以传给底层的起始地址就是sector*4096
//要读取多少个字节，就是读取的扇区个数count*4096
res = RES_OK;
return res;
}
return RES_PARERR;
}
/*-----------------------------------------------------------------------*/
/* Write Sector(s) */
/*-----------------------------------------------------------------------*/
//向存储设备的扇区写入数据
#if FF_FS_READONLY == 0
DRESULT disk_write (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
const BYTE *buff, /* Data to be written */
LBA_t sector, /* Start sector in LBA */
UINT count /* Number of sectors to write */
)
{
DRESULT res;
// int result;
switch (pdrv) {
case SD_CARD :
return res;
case SPI_FLASH :
W25QXX_Write((u8*)buff,sector*4096,count*4096); //buff是const BYTE类型，而传入下一层需要的是uint8_t类型，所以此处进行强制转化
res = RES_OK ;
return res;
}
return RES_PARERR;
}
#endif
/*-----------------------------------------------------------------------*/
/* Miscellaneous Functions */
/*-----------------------------------------------------------------------*/
//控制设备特定功能和通用的读/写以外的其他功能
DRESULT disk_ioctl (
BYTE pdrv, /* Physical drive nmuber (0..) */
BYTE cmd, /* Control code */
void *buff /* Buffer to send/receive control data */
)
{
DRESULT res;
// int result;
switch (pdrv) {
case SD_CARD :
return res;
case SPI_FLASH :
switch(cmd) //这一部分可有可无，可以按照自己需要实现其功能不需要就不写；
{
//返回扇区个数
case GET_SECTOR_COUNT:
*(DWORD *)buff = 16777216; //此次试验是w25q128，全部用于文件系统，共16MB字节，即16777216字节
break;
//返回扇区大小
case GET_SECTOR_SIZE:
*(WORD *)buff = 4096 ;
break;
//返回擦除扇区的最小个数
case GET_BLOCK_SIZE:
*(WORD *)buff = 1 ; //每次擦除一个扇区
break;
}
res = RES_OK; //由此看出，此处的数据返回值不是通过return返回的，如之前的讲解是通过指针返回
return res;
}
return RES_PARERR;
}
//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;
}
//这个函数是用来获取时间的，没有实现其功能，但是如果没有的话，就会报get_fattime函数缺失的错误，需要的话可以实现其功能。--------------------------------------------------------------------------------------------------------------------------------
修改好的ffconf.h文件：
/*---------------------------------------------------------------------------/
/ Configurations of FatFs Module
/---------------------------------------------------------------------------*/
#define FFCONF_DEF 80286 /* Revision ID */
/*---------------------------------------------------------------------------/
/ Function Configurations
/---------------------------------------------------------------------------*/
#define FF_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 FF_FS_MINIMIZE 0
/* This option defines minimization level to remove some basic API functions.
/
/ 0: Basic functions are fully 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 FF_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 FF_USE_MKFS 1 //使用格式化f_mkfs（）必须将此宏置1
/* This option switches f_mkfs() function. (0:Disable or 1:Enable) */
#define FF_USE_FASTSEEK 0
/* This option switches fast seek function. (0:Disable or 1:Enable) */
#define FF_USE_EXPAND 0
/* This option switches f_expand function. (0:Disable or 1:Enable) */
#define FF_USE_CHMOD 0
/* This option switches attribute manipulation functions, f_chmod() and f_utime().
/ (0:Disable or 1:Enable) Also FF_FS_READONLY needs to be 0 to enable this option. */
#define FF_USE_LABEL 0
/* This option switches volume label functions, f_getlabel() and f_setlabel().
/ (0:Disable or 1:Enable) */
#define FF_USE_FORWARD 0
/* This option switches f_forward() function. (0:Disable or 1:Enable) */
#define FF_USE_STRFUNC 0
#define FF_PRINT_LLI 1
#define FF_PRINT_FLOAT 1
#define FF_STRF_ENCODE 3
/* FF_USE_STRFUNC switches string functions, f_gets(), f_putc(), f_puts() and
/ f_printf().
/
/ 0: Disable. FF_PRINT_LLI, FF_PRINT_FLOAT and FF_STRF_ENCODE have no effect.
/ 1: Enable without LF-CRLF conversion.
/ 2: Enable with LF-CRLF conversion.
/
/ FF_PRINT_LLI = 1 makes f_printf() support long long argument and FF_PRINT_FLOAT = 1/2
/ makes f_printf() support floating point argument. These features want C99 or later.
/ When FF_LFN_UNICODE >= 1 with LFN enabled, string functions convert the character
/ encoding in it. FF_STRF_ENCODE selects assumption of character encoding ON THE FILE
/ to be read/written via those functions.
/
/ 0: ANSI/OEM in current CP
/ 1: Unicode in UTF-16LE
/ 2: Unicode in UTF-16BE
/ 3: Unicode in UTF-8
*/
/*---------------------------------------------------------------------------/
/ Locale and Namespace Configurations
/---------------------------------------------------------------------------*/
#define FF_CODE_PAGE 936 //如果需要支持简体中文，需要把ffconf.h中的_CODE_PAGE的宏改成936
/* This option specifies the OEM code page to be used on the target system.
/ Incorrect code page setting can cause a file open failure.
/
/ 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)
/ 0 - Include all code pages above and configured by f_setcp()
*/
#define FF_USE_LFN 0
#define FF_MAX_LFN 255
/* The FF_USE_LFN switches the support for LFN (long file name).
/
/ 0: Disable LFN. FF_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, ffunicode.c needs to be added to the project. The LFN function
/ requiers certain internal working buffer occupies (FF_MAX_LFN + 1) * 2 bytes and
/ additional (FF_MAX_LFN + 44) / 15 * 32 bytes when exFAT is enabled.
/ The FF_MAX_LFN defines size of the working buffer in UTF-16 code unit and it can
/ be in range of 12 to 255. It is recommended to be set it 255 to fully support LFN
/ specification.
/ 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() exemplified in ffsystem.c, need to be added to the project. */
#define FF_LFN_UNICODE 0
/* This option switches the character encoding on the API when LFN is enabled.
/
/ 0: ANSI/OEM in current CP (TCHAR = char)
/ 1: Unicode in UTF-16 (TCHAR = WCHAR)
/ 2: Unicode in UTF-8 (TCHAR = char)
/ 3: Unicode in UTF-32 (TCHAR = DWORD)
/
/ Also behavior of string I/O functions will be affected by this option.
/ When LFN is not enabled, this option has no effect. */
#define FF_LFN_BUF 255
#define FF_SFN_BUF 12
/* This set of options defines size of file name members in the FILINFO structure
/ which is used to read out directory items. These values should be suffcient for
/ the file names to read. The maximum possible length of the read file name depends
/ on character encoding. When LFN is not enabled, these options have no effect. */
#define FF_FS_RPATH 0
/* This option configures support for 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 FF_VOLUMES 2 //表示支持设备号的数目
/* Number of volumes (logical drives) to be used. (1-10) */
#define FF_STR_VOLUME_ID 0
#define FF_VOLUME_STRS "RAM","NAND","CF","SD","SD2","USB","USB2","USB3"
/* FF_STR_VOLUME_ID switches support for volume ID in arbitrary strings.
/ When FF_STR_VOLUME_ID is set to 1 or 2, arbitrary strings can be used as drive
/ number in the path name. FF_VOLUME_STRS defines the volume ID strings for each
/ logical drives. Number of items must not be less than FF_VOLUMES. Valid
/ characters for the volume ID strings are A-Z, a-z and 0-9, however, they are
/ compared in case-insensitive. If FF_STR_VOLUME_ID >= 1 and FF_VOLUME_STRS is
/ not defined, a user defined volume string table is needed as:
/
/ const char* VolumeStr[FF_VOLUMES] = {"ram","flash","sd","usb",...
*/
#define FF_MULTI_PARTITION 0
/* This option switches support for multiple volumes on the 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 this function is enabled (1), each logical drive number can be bound to
/ arbitrary physical drive and partition listed in the VolToPart[]. Also f_fdisk()
/ function will be available. */
#define FF_MIN_SS 512
#define FF_MAX_SS 4096
/* This set of options configures the range of sector size to be supported. (512,
/ 1024, 2048 or 4096) Always set both 512 for most systems, generic memory card and
/ harddisk, but a larger value may be required for on-board flash memory and some
/ type of optical media. When FF_MAX_SS is larger than FF_MIN_SS, FatFs is configured
/ for variable sector size mode and disk_ioctl() function needs to implement
/ GET_SECTOR_SIZE command. */
#define FF_LBA64 0
/* This option switches support for 64-bit LBA. (0:Disable or 1:Enable)
/ To enable the 64-bit LBA, also exFAT needs to be enabled. (FF_FS_EXFAT == 1) */
#define FF_MIN_GPT 0x10000000
/* Minimum number of sectors to switch GPT as partitioning format in f_mkfs and
/ f_fdisk function. 0x100000000 max. This option has no effect when FF_LBA64 == 0. */
#define FF_USE_TRIM 0
/* This option switches support for ATA-TRIM. (0:Disable or 1:Enable)
/ To enable Trim function, also CTRL_TRIM command should be implemented to the
/ disk_ioctl() function. */
/*---------------------------------------------------------------------------/
/ System Configurations
/---------------------------------------------------------------------------*/
#define FF_FS_TINY 0
/* This option switches tiny buffer configuration. (0:Normal or 1:Tiny)
/ At the tiny configuration, size of file object (FIL) is shrinked FF_MAX_SS bytes.
/ Instead of private sector buffer eliminated from the file object, common sector
/ buffer in the filesystem object (FATFS) is used for the file data transfer. */
#define FF_FS_EXFAT 0
/* This option switches support for exFAT filesystem. (0:Disable or 1:Enable)
/ To enable exFAT, also LFN needs to be enabled. (FF_USE_LFN >= 1)
/ Note that enabling exFAT discards ANSI C (C89) compatibility. */
#define FF_FS_NORTC 0
#define FF_NORTC_MON 1
#define FF_NORTC_MDAY 1
#define FF_NORTC_YEAR 2022
/* The option FF_FS_NORTC switches timestamp feature. If the system does not have
/ an RTC or valid timestamp is not needed, set FF_FS_NORTC = 1 to disable the
/ timestamp feature. Every object modified by FatFs will have a fixed timestamp
/ defined by FF_NORTC_MON, FF_NORTC_MDAY and FF_NORTC_YEAR in local time.
/ To enable timestamp function (FF_FS_NORTC = 0), get_fattime() function need to be
/ added to the project to read current time form real-time clock. FF_NORTC_MON,
/ FF_NORTC_MDAY and FF_NORTC_YEAR have no effect.
/ These options have no effect in read-only configuration (FF_FS_READONLY = 1). */
#define FF_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 the 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.
*/
#define FF_FS_LOCK 0
/* The option FF_FS_LOCK switches file lock function to control duplicated file open
/ and illegal operation to open objects. This option must be 0 when FF_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 FF_FS_REENTRANT 0
#define FF_FS_TIMEOUT 1000
/* The option FF_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 featuer.
/
/ 0: Disable re-entrancy. FF_FS_TIMEOUT have no effect.
/ 1: Enable re-entrancy. Also user provided synchronization handlers,
/ ff_mutex_create(), ff_mutex_delete(), ff_mutex_take() and ff_mutex_give()
/ function, must be added to the project. Samples are available in ffsystem.c.
/
/ The FF_FS_TIMEOUT defines timeout period in unit of O/S time tick.
*/
/*--- End of configuration options ---*/
---------------------------------------------------------------------------------------------------------------------------------
测试用的main.c文件：
#include "sys.h"
#include "delay.h"
#include "timer.h"
#include "usart.h"
#include "ff.h"
#include "diskio.h"
#include "w25qxx.h"
#include "spi.h"
FATFS fsobject;
BYTE work[FF_MAX_SS];
FIL fp ;
const char write_buf[] = "333";
char read_buf[4096] = "";
UINT bw;
UINT br; //写SD卡次
int main(void)
{
FRESULT res ;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置中断优先级分组为组2：2位抢占优先级，2位响应优先级
delay_init(); //延时函数初始化
uart_init(115200);
W25QXX_Init(); //W25QXX初始化
//led_init();
//timer_init(1000-1,7200-1);//延时10s
while(W25QXX_ReadID()!=W25Q128) //检测不到W25Q128
{
printf("W25Q128 Check Failed!");
delay_ms(500);
printf("Please Check!\r\n");
delay_ms(500);
}
printf("W25Q128 Ready!\r\n");
// 挂载文件系统
res = f_mount(&fsobject, "1:", 1);
printf("挂载文件系统, res = %d\r\n", res);
// res = f_mkfs("1:", 0, work, sizeof(work));
// res = f_mount(&fsobject, "1:", 1);
// printf("挂载文件系统, res = %d\r\n", res);
if (res == FR_NO_FILESYSTEM) {
res = f_mkfs("1:", 0, work, sizeof(work));
if (res != FR_OK) {
printf("文件格式化失败，res = %d\r\n", res);
f_mount(NULL, "1:", 1); // 取消文件系统
res = f_mount(&fsobject, "1:", 1); // 重新挂载文件系统
printf("重新挂载文件系统, res = %d\r\n", res);
}
}
printf("挂载文件系统结果, res = %d\r\n", res);
// 打开文件
res = f_open(&fp, "1:RD", FA_OPEN_ALWAYS | FA_READ | FA_WRITE);
printf("打开文件结果, res = %d\r\n", res);
if (res == FR_OK) {
// 写入文件
res = f_write(&fp, write_buf, sizeof(write_buf), &bw);
if (res == FR_OK) {
printf("写入成功, bw=%u\r\n", bw);
f_lseek(&fp, 0); // 移动文件指针到开头
res = f_read(&fp, read_buf, sizeof(read_buf), &br);
if (res == FR_OK) {
printf("文件内容为：%s , br=%u\r\n", read_buf, br);
} else {
printf("读取文件失败，错误码：%d\r\n", res);
}
} else {
printf("写入文件失败，错误码：%d\r\n", res);
}
f_close(&fp); // 关闭文件
} else {
printf("打开文件失败，错误码：%d\r\n", res);
}
}